Huawei Mobile Softswitch Product Description
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Transcript of Huawei Mobile Softswitch Product Description
-
UMG8900 V200R009
Product Description
Issue 1.0
Date 2013-04-09
HUAWEI TECHNOLOGIES CO., LTD.
-
HUAWEI UMG8900
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
Page 2 of 67
Copyright Huawei Technologies Co., Ltd. 2010. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without
prior written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other
trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the commercial contract made
between Huawei and the customer. All or partial products, services and features described in this
document may not be within the purchased scope or the usage scope. Unless otherwise agreed by
the contract, all statements, information, and recommendations in this document are provided "AS
IS" without warranties, guarantees or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in
the preparation of this document to ensure accuracy of the contents, but all statements, information,
and recommendations in this document do not constitute the warranty of any kind, express or
implied.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: [email protected]
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UMG8900 V200R009C02
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
Page 3 of 67
Contents
1 Product Positioning ...................................................................................................................... 7
1.1 Introduction to the UMG8900 in the Mobile Softswitch Solution ................................................................... 7
1.2 Positioning of the UMG8900 ........................................................................................................................... 8
1.3 Benefits for Customers ..................................................................................................................................... 9
2 Product Features .......................................................................................................................... 11
3 Product Architectures ................................................................................................................. 19
3.1 Hardware Architecture ................................................................................................................................... 19
3.2 Software Architecture ..................................................................................................................................... 45
4 Application Scenarios ................................................................................................................ 46
4.1 GSM Networking ........................................................................................................................................... 46
4.2 UMTS R99 Networking ................................................................................................................................. 48
4.3 UMTS R4 Networking ................................................................................................................................... 48
4.4 IMS Networking ............................................................................................................................................. 49
5 Technical Specification .............................................................................................................. 50
5.1 System Performance ....................................................................................................................................... 50
5.2 Technical Parameters of the Whole UMG8900 .............................................................................................. 55
5.3 Environmental Specifications......................................................................................................................... 56
6 Acronyms and Abbreviations ................................................................................................... 64
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UMG8900 V200R009C02
Product Description
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Copyright Huawei Technologies Co., Ltd.
Page 4 of 67
Figures
Figure 1-1 Networking for Huawei mobile softswitch solution ............................................................................ 8
Figure 3-1 Front view of an N68E-22 cabinet ..................................................................................................... 20
Figure 3-2 Front view of an SSM-160 frame ...................................................................................................... 21
Figure 3-3 Hardware components (SSM-160 frames) ......................................................................................... 22
Figure 3-4 Structure of the UMG8900 assembly cabinet (V200R009; six 48 VDC inputs). ............................ 23
Figure 3-5 Board deployment in an SSM-160 frame .......................................................................................... 24
Figure 3-6 Logical components of the SSM-160 hardware ................................................................................. 25
Figure 3-7 Software architecture of the UMG8900 ............................................................................................. 45
Figure 4-1 GSM networking ............................................................................................................................... 47
Figure 4-2 UMTS R99 networking ..................................................................................................................... 48
Figure 4-3 UMTS R4 application ........................................................................................................................ 49
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UMG8900 V200R009C02
Product Description
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Copyright Huawei Technologies Co., Ltd.
Page 5 of 67
Tables
Table 2-1 Interface types ..................................................................................................................................... 11
Table 3-1 Equipment and resource management units ........................................................................................ 27
Table 3-2 Service and protocol processing units ................................................................................................. 31
Table 3-3 Switching and cascading units ............................................................................................................. 34
Table 3-4 Interface units ...................................................................................................................................... 37
Table 3-5 Media resource processing units .......................................................................................................... 42
Table 3-6 Clock units ........................................................................................................................................... 44
Table 3-7 Lightning protection units ................................................................................................................... 45
Table 5-1 Service processing capability of a GSM/UMTS local exchange ......................................................... 50
Table 5-2 Service processing capabilities of a GSM/UMTS gateway exchange or tandem exchange ................ 51
Table 5-3 Service processing capability (signaling transfer) ............................................................................... 52
Table 5-4 Hardware platform switching capability.............................................................................................. 52
Table 5-5 Clock specifications ............................................................................................................................. 53
Table 5-6 Voice quality specifications ................................................................................................................. 54
Table 5-7 Reliability specifications ..................................................................................................................... 54
Table 5-8 Power supply and consumption of the SSM ........................................................................................ 55
Table 5-9 Mechanical specifications of the UMG8900 ....................................................................................... 55
Table 5-10 Climatic conditions ............................................................................................................................ 57
Table 5-11 Density of mechanical active substances ........................................................................................... 57
Table 5-12 Density of chemical active substances............................................................................................... 58
Table 5-13 Mechanical stress ............................................................................................................................... 58
Table 5-14 Climatic conditions ............................................................................................................................ 59
Table 5-15 Density of mechanical active substances ........................................................................................... 60
Table 5-16 Density of chemical active substances............................................................................................... 60
Table 5-17 Mechanical stress ............................................................................................................................... 61
Table 5-18 Climatic conditions ............................................................................................................................ 62
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UMG8900 V200R009C02
Product Description
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Copyright Huawei Technologies Co., Ltd.
Page 6 of 67
Table 5-19 Density of mechanical active substances ........................................................................................... 62
Table 5-20 Density of chemical active substances............................................................................................... 63
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HUAWEI UMG8900
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
Page 7 of 67
1 Product Positioning 1.1 Introduction to the UMG8900 in the Mobile Softswitch Solution
The UMG8900 is designed based on the softswitch architecture. The UMG8900 interworks
with the mobile switching center (MSC) server of Huawei to support various narrowband
voice and data services of the existing global system for mobile communications (GSM)
network. In addition, the IP packet transmission technology is introduced to ensure smooth
evolution from the time division multiplexing (TDM) network to the IP packet network.
At present, the softswitch technology is mainly used in the core network (CN). The mobile
softswitch supports the distributed networking and IP bearer, which improves the bearer
transmission efficiency and reduces the operational expenditure (OPEX). The mobile
softswitch also supports smooth network evolution to reduce the investment risks of carriers.
To cater to different networking requirements and network characteristics, Huawei provides
the 2G/3G integrated softswitch solution. This solution provides maintainability, operability,
and easy management to support different networking modes such as GSM, 3GPP R99, 3GPP
R4, and 3GPP R5 networking. Figure 1-1 shows the typical networking for Huawei mobile
softswitch solution in 3GPP R4 networking.
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Copyright Huawei Technologies Co., Ltd.
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Figure 1-1 Networking for Huawei mobile softswitch solution
PSTN
InternetUTRAN
Other
networksMSC server
(MSOFTX3000)
MSC server
(MSOFTX3000)
MGW
(UMG8900)
MGW
(UMG8900)
HLR
GGSNSGSN
BSS
CN
Bearer channel
Signaling channel
3G access
2G access
CS
PS
GGSN: gateway GPRS support node HLR: home location
register
MGW: media gateway
MSC server: mobile switching center
server
CN: core network CS: circuit switched
domain
SGSN: serving GPRS support node PS: packet switched
domain
PSTN: public switched
telephone network
UTRAN: UMTS terrestrial radio
access network
BSS: base station
subsystem
According to the evolution policy for the CS domain of the mobile CN, the MSC in the GSM
and 3GPP R99 networking is replaced by two functional entities, namely, the MSC server and
media gateway (MGW), in the 3GPP R4 and later networking to meet the requirements for
development towards all-IP networks.
MSC server: The MSC server provides access to the base station subsystem (BSS) or
UMTS terrestrial radio access network (UTRAN). It implements control functions such
as mobility management, security management, switchover processing, signaling
processing, call processing, and subscriber service data management (VLR function).
MGW: The MGW implements functions such as media conversion, bearer control,
digital signal coding/decoding, echo cancellation, and conference bridging.
1.2 Positioning of the UMG8900
The UMG8900 can function as any of the following devices in Huawei mobile softswitch
solution:
Service bearer device in a local exchange in the GSM network
Service bearer device in a tandem/toll exchange in the GSM network
Service bearer device in a gateway exchange in the GSM network
Visited mobile switching center (VMSC), tandem mobile switching center (TMSC) or
gateway mobile switching center (GMSC) together with Huawei MSC server in the
GSM network, supporting the integration of these functions
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Copyright Huawei Technologies Co., Ltd.
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VMSC, TMSC, or GMSC together with Huawei MSC server in the universal mobile
telecommunications system (UMTS) R99 network, supporting the integration of these
functions
MGW in the UMTS R4 core network
IP multimedia-MGW (IM-MGW) in the UMTS R5 and subsequent IP multimedia
subsystem (IMS) network
In the fixed-mobile convergence (FMC) networking applications, the UMG8900 can provide
functions of all the preceding functional entities, as well as acting as any of them. In addition,
the UMG8900 supports UMTS, code division multiple access (CDMA), and next generation
network (NGN) networking and can be applied in convergence of UMTS, CDMA, and NGN
networks.
The UMG8900 can network with the MSC server of Huawei to support various basic,
supplementary, and value-added services in the traditional GSM network. In addition, as the
UMG8900 is based on the separated architecture, it is easy and quick to introduce new
services.
Based on the requirements and network characteristics of different operators, Huawei
provides maintainable, operable and manageable customized network solutions. The solutions
lay a foundation for network operators to obtain more profits.
1.3 Benefits for Customers
Serving as a bearer device in Huawei mobile softswitch solution, the UMG8900 converts
service bearers, enables interworking between services, and processes service stream formats.
With the help of these functions, the UMG8900 can help carriers build low-cost, profitable,
and future-oriented mobile communications networks.
High integration with the traffic support of 80000 erlangs in each cabinet
Up to three SSM-160 frames can be self-cascaded. The three SSM-160 frames occupy a
cabinet. One cabinet supports the traffic of up to 80000 erlangs. The frames can be
flexibly configured according to the actual networking conditions and capacity
requirements of users.
Diversified interfaces
The UMG8900 provides multiple clock interfaces and other types of interfaces that meet
the requirements of TDM, IP, and ATM bearer services.
Facilitation of all-IP network construction
The UMG8900 provides the IP-based A/Iu interface and IP-based Nb interface and
supports IP over E1, enabling evolution to the all-IP network. In addition, the UMG8900
supports the Real-time Transport Protocol (RTP) multiplexing and IP voice compressor
plus (IVCP) functions to save a large amount of bandwidth, thus reducing the
transmission cost.
Powerful fault tolerance capability
The UMG8900 supports dual-homing, Stream Control Transmission Protocol (SCTP)
multi-homing, and MSC pool networking to ensure system reliability.
Enhanced IP quality of service (QoS) and voice quality
The UMG8900 provides the functions of dynamic jitter buffer, packet loss compensation
(PLC), automatic gain control (AGC), electrical echo cancellation (EEC), and tandem
free operation/transcoder free operation (TFO/TrFO) to enhance voice quality, which
improves customer satisfaction.
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Copyright Huawei Technologies Co., Ltd.
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Upgrade without service interruption
During a software upgrade, the UMG8900 ensures that online services are not affected
and calls are not interrupted. Moreover, the period during which users cannot access new
services is not more than 10 seconds.
Powerful IP operation and maintenance capability
To facilitate maintenance in an all-IP network, the UMG8900 provides the functions of
IP connection admission control (CAC), IP QoS detection, and dialing tests for specified
IP addresses. This reduces maintenance cost.
FMC networking applications
The UMG8900 can be partitioned into multiple virtual media gateways (VMGWs). In
this manner, bearer and media resources on one UMG8900 can be shared among
different networks such as the GSM, UMTS, CDMA, NGN, and IMS networks, reducing
the capital expenditure (CAPEX) and OPEX of customers.
Embedded video interworking gateway (VIG)
The UMG8900 processes video service streams and converts video service streams of
different formats. It can cooperate with the softswitch to provide diversified video
communications services.
Easy operation and maintenance
The UMG8900 can be managed locally or remotely through the graphical user interface
(GUI) client (device panel on the LMT), man-machine language (MML) command lines
on the local maintenance terminal (LMT), and network management system (NMS). In
addition, comprehensive help information is provided to facilitate operation and study of
users.
Perfect security design
Security control is enabled for system control data and operation and maintenance data,
guaranteeing security of user data and services.
Intelligent power consumption reduction
When the resource usage on the UMG8900 is low, certain boards are automatically
powered off to reduce power consumption.
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HUAWEI UMG8900
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
Page 11 of 67
2 Product Features High Integration with the Traffic Support of 80000 Erlangs in Each Cabinet
For improving the integration of the UMG8900 and reducing the power consumption and
equipment room space consumption, the new hardware platform, SSM-160 frame, is
introduced in UMG8900 V200R009. The SSM-160 frame significantly increases the
processing capability of a single frame of the UMG8900 to 160 K TDM. In addition, the
supported traffic by three SSM-160 frames self-cascaded in a cabinet can be up to 80000
erlangs.
Diversified Interfaces
Table 2-1 lists the interface types supported by the UMG8900.
Table 2-1 Interface types
Interface Type Number Description
E1/T1 Up to 1512 The interfaces are used to connect with the BSC,
PSTN, MSC and the peer UMG8900s. The E1 and
T1 interfaces use the same boards except that the
interface configuration is different. The E1 and T1
interfaces are electric interfaces and share the
hardware.
E3/T3 Up to 102 The interfaces are used to connect with the BSC,
PSTN, MSC and the peer UMG8900s. The E3 and
T3 interfaces use the same boards except that the
interface configuration is different. The E3 and T3
interfaces are electric interfaces and share the
hardware.
E1/T1 ATM
(IMA)
Up to 544 The interfaces are used to connect with the RNC.
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Interface Type Number Description
STM-1 ATM Up to 68 pairs The interfaces are used to connect with the RNC.
STM-1 ATM interfaces include multi-mode
interfaces and three types of single-mode optical
interfaces. The transmission distance is 2 km
(multi-mode), 15 km (single-mode), 40 km
(single-mode) and 80 km (single-mode)
respectively.
STM-1
SDH/OC-3
SONET
Up to 72
(load-sharing
mode) or 68
pairs
(master/slave
mode)
The interfaces are used to connect with the BSC,
PSTN, MSC and the peer UMG8900s.
SDH interfaces include electric interfaces,
multi-mode interfaces and three types of
single-mode optical interfaces. The transmission
distance is 2 km (multi-mode), 15 km (single-mode),
40 km (single-mode) and 80 km (single-mode)
respectively.
FE (bearer) Up to 272
load-sharing
mode) or 136
pairs
(master/slave
mode)
The interfaces are used to connect with the peer
UMG8900s.
They are used to bear IP voice services.
FE (control) Up to three
pairs
The interfaces are used to connect with MSC
servers.
They are used to exchange H.248 messages.
FE (SIGTRAN) Up to three
pairs
The interfaces are used to connect with MSC
servers.
They are used for the signaling adaptation based on
SIGTRAN. They work in the 1+1 backup mode.
FE (OMC) One pair The interfaces are used to connect with the LMT and
the network management device. They work in the
1+1 backup mode.
GE (bearer) Up to 34 pairs
(load-sharing)
or 17 pairs
(master and
slave)
The interfaces are used to connect with the peer
UMG8900s.
GE interfaces include multi-mode interfaces and
three types of single-mode optical interfaces. The
transmission distance is 0.55 km (multi-mode), 10
km (single-mode), 40 km (single-mode) and 70 km
(single-mode) respectively.
8 kHz clock
interfaces
4 The interfaces are used to extract line clock signals
from TDM interface boards. They work in
master/slave mode.
BITS clock
interfaces
2 The interfaces include the 2048 kHz interface, 2048
kbit/s interface, 1544kbit/s interface and 64kHz
interface. They are used to extract clock signals
from a BITS. They work in master/slave mode.
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Copyright Huawei Technologies Co., Ltd.
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Interface Type Number Description
GPS/GLONASS
clock interfaces
2 The interfaces are used to receive synchronous clock
signals from a satellite synchronous system. They
work in master/slave mode.
The UMG8900 supports small form factor pluggable (SFP) optical modules for the STM-1
SDH/SONET interface. These interfaces can be configured with different optical modules in
different applications.
Facilitation of All-IP Network Construction
Service interworking between two all-IP networks can be realized by setting different
domains. The UMG8900 provides the IP-based A/Iu and IP-based Nb interfaces and supports
the IP over E1 feature to facilitate smooth evolution to all-IP networks.
IP-based Iu interface
Both the RAN and CN adopt IP packet transmission technology to construct an all-IP
network. Thus, the RAN and CN may share the IP bearer network.
IP-based A interface
Both the BSS and NSS adopt the IP packet transmission technology to construct an all-IP
network. Thus, the BSS and NSS may share the IP bearer network.
IP over E1 function
The UMG8900 converts IP data packets into TDM packets and serves as a router to
transparently transmit packets. If the IP bearer interface in use is a Serial or VT interface,
the UMG8900 supports the Compressed Real-Time Protocol (cRTP) function. In this
case, the UMG8900 reduces the bandwidth occupied by RTP packets by compressing the
RTP packets, thus improving transmission efficiency.
IVCP function
In IP over E1 applications, the UMG8900 can compress IP packets to reduce the bearer
bandwidth occupied by voice over IP (VoIP) packets. In this case, the compression
capability of the UMG8900 is close to that of the digital circuit multiplication equipment
(DCME), and external devices are not required. This function helps to reduce the IP
transmission bandwidth usage and network construction cost of carriers.
RTP multiplexing function
In Fast Ethernet (FE) and Gigabit Ethernet (GE) applications, multiple voice packets can
share one IP packet header, which reduces the IP transmission bandwidth usage and
network construction cost of carriers. In addition, the number of IP packets to be
transmitted decreases, thus reducing the traffic load on routers.
The UMG8900 also supports automatic dialling tests on the IP bearer network and VisualIP
information collection. In cooperation with the Serv-Monitor and VisualIP products, it
monitors network failures, optimizes network functions, and reduces operating expenditure
(OPEX).
Powerful Fault Tolerance Capability
The UMG8900 provides powerful fault tolerance capability in terms of the following,
guaranteeing carrier-class reliability of the system.
All main control boards support the 1+1 backup function.
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The interfaces support the 1+1 and N:1 backup functions, the automatic protection
switch (APS) interface protection, optical signals through and off protection and so on.
The service resource boards work in the resource pool mode to share all the resources.
The multi-frame cascading mode supports master and slave cascading channels to avoid
any single-point fault.
The UMG8900 supports the dual-homing function. When the master MSC server fails,
the UMG8900 switches to the slave MSC server to ensure the normal running of
services.
The UMG8900 supports the SCTP multi-homing function. In an SCTP association, the
UMG8900 and its peer device can be configured with multiple IP addresses, providing
multiple end-to-end paths for upper-layer protocol users. In this manner, the transmission
reliability is ensured.
The UMG8900 supports the A-Flex/Iu-Flex function to realize MSC pool networking. In
MSC pool networking, devices in the access network can connect to each MSC server
without being upgraded. MSC servers in an MSC pool work in load-sharing mode and
their resources can be shared. If an MSC server fails, another MSC server in the MSC
pool takes over services provided by the faulty MSC server to implement network fault
tolerance. The UMG8900 also supports NAS node selection function (NNSF). When an
MSC server fails, the NNSF enables the services of the BSC to be passed to the nearest
MSC server, implementing fault tolerance and save communication resources.
When the system is overloaded, the call completion rate of VIP users is guaranteed by
preference.
Enhanced IP QoS and Voice Quality
The UMG8900 provides the functions such as EEC, PLC, Enhanced PLC, AGC, dynamic
jitter buffer, and TFO/TrFO/Acoustic Echo Cancellation for TrFO Calls (AEC for TrFO) to
enhance voice quality, which improves user experience. The following lists the functions and
methods to enhance the IP QoS and voice quality:
Voice quality assurance technologies such as EEC, voice activity detection (VAD),
background noise reduction (BNR), comfort noise generation (CNG), AGC, PLC,
Enhanced PLC, voice quality enhancement (VQE), TFO/TrFO, and (AEC for TrFO).
NOTE TrFO is the transport of compressed speech in a packet transport network through the elimination of
unnecessary coding and decoding of signals by intermediate elements in the bearer path. By
transporting only the compressed speech, TrFO achieves bandwidth efficiencies in the bearer stream
and reduces round trip delays introduced by unnecessary transcoding, thus increasing voice quality.
The TrFO function is defined in 3rd Generation Partnership Project (3GPP) R4 specifications and is
supported by the UMG8900.
TFO is configured for two transcoders that support the TFO protocol. When the codec types of the
two transcoders are matched, this function enables inband negotiation about codec selection instead
of codec conversion, thus improving voice quality. The TFO function is defined in 3GPP GSM, R99,
and R4 specifications and is supported by the UMG8900.
Enhanced PLC is an enhanced frame loss compensation algorithm that is mainly applicable to voice
services to enhance the capability of preventing packet loss and improve the voice quality in the case
of frame loss.
Various QoS assurance methods such as the setting of voice and data service priorities,
dynamic jitter buffer, IP type of service (ToS), differentiated service code point (DSCP),
802.1P/Q and virtual local area network (VLAN) priority.
Online end-to-end voice quality detection of VoIP users: Data about user voice quality
can be displayed graphically, facilitating network management and optimization for
carriers.
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Upgrade Without Service Interruption
During a software upgrade, the UMG8900 ensures that online services are not affected and
calls are not interrupted. Moreover, the period during which users cannot access new services
is less than10 seconds. This feature minimizes the impact of a software upgrade on services
and reduces the number of access failures, thus enlarging the profits of carriers.
In the UMG8900, the boards are grouped into different batches for batch-by-batch software
loading.
The boards working in master/slave mode are categorized into the master plane and slave
plane. The slave plane is upgraded first, and then the master plane is upgraded.
The boards working in load-sharing mode are grouped according to their functions. Only
some boards in a group are upgraded each time to ensure that a board that can provide
services is available in each group.
In this manner, services are not interrupted during the upgrade.
Powerful IP Operation and Maintenance Capability
During fast migration of mobile CNs to IP networks, carriers face a great challenge. They
need to integrate carrier-level service security and reliability provided by the TDM network
into the IP network.
The IP network is complex; therefore, it may encounter various faults. To ensure that the IP
network can be better applied to voice communications, the UMG8900 provides the following
mechanisms:
Dialing tests for specified IP addresses and users: The UMG8900 can automatically loop
back terminations in voice channels, expediting fault location and service verification,
and facilitating maintenance and management by carriers.
Active IP QoS detection: The UMG8900 supports the QoS-based IP CAC function.
When services on the IP network are blocked, the UMG8900 actively decreases service
traffic, thus reducing the congestion on the IP network and improving the call
completion rate on the CN.
VisualIP server provides graphical user interfaces (GUIs) for viewing paths between
network elements (NEs), bandwidth, and QoS by using Internet Explorer (IE) or other
terminals, thereby facilitating OM.
NOTE
An independent server for saving the OM data is required for using the VisualIP server.
FMC Networking Applications
FMC has become an inevitable trend for traditional carriers to evolve into comprehensive
carriers. To meet this requirement, the UMG8900 employs the advanced fixed-mobile
converged hardware platform and software platform and supports services of multiple
networks such as the UMTS, CDMA, NGN, and IMS networks by integrating functions of the
original independent functional entities. In this case, resources on one UMG8900 can be
shared among different networks. On one physical platform, the UMG8900 can serve as
different functional entities. Thus, the UMG8900 can implement interworking of bearer
resources in the service plane and provide various bearer resources and diversified user access
functions. The UMG8900 supports interworking between the IP multimedia subsystem (IMS)
and other networks when functioning as an IM-MGW and supports interworking between two
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IMSs when cooperating with the MSOFTX3000 to provide the interworking border gateway
function (IBGF).
In the softswitch architecture, the UMG8900 is controlled by the MSC server. One UMG8900
can be partitioned into multiple VMGWs. These VMGWs provide functions independently
and are managed by softswitches in different networks. For example, after a UMG8900 is
partitioned into two VMGWs, the VMGWs can be controlled by a fixed softswitch and a
mobile softswitch separately so that the FMC application is implemented. The large-capacity
and high-performance converged MGW has the following advantages:
The number of network elements (NEs) is reduced, thus saving the CAPEX.
The fixed-mobile converged MGW simplifies the network topology and cuts the OPEX
by reducing spare parts and implementing integrated maintenance.
VMGWs can directly interwork with each other, thus reducing the end-to-end delay and
improving the voice quality.
Resources of different fields are shared, improving the device usage efficiency.
Embedded VIG
The UMG8900 supports the embedded VIG function. It can cooperate with the MSC server to
provide diversified video communications services. With the embedded VIG function enabled
on the UMG8900, the video interworking between mobile networks and IMS and NGN
networks can be realized without deployment of an independent VIG. This function has the
following advantages:
Simplifying the networking
Reducing indirect voice channels
Decreasing call delay
Improving quality of video calls
Cutting the CAPEX and OPEX of carriers
The UMG8900 supports the Windowed Numbered Simple Retransmission Protocol (WNSRP)
technology to realize quick call connection; it can interwork with the Multimedia Ring Back
Tone (MRBT) platform to play multimedia ring back tones for 3G video terminals.
In addition to the interworking in the control plane, multiplexing and demultiplexing in the
bearer plane, and codec conversion in the media plane, the UMG8900 also supports the
following features and functions with the embedded VIG function:
H.263 ,MPEG-4 and H.264 video codecs
H.245 video call control and H.223 video service multiplexing protocols
Convergence of video and voice
Lawful interception of multiplexing multimedia streams
The UMG8900, adopting flexible and extensible software and hardware architectures, can
provide extended services after a software upgrade.
Easy Operation and Maintenance
The UMG8900 provides the following operation and maintenance functions:
The UMG8900 can be accessed and managed locally and remotely by multiple users
through the GUI client (device panel on the LMT), centralized network management and
maintenance interface, or MML commands.
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Comprehensive help information is provided through the LMT that can be easily
operated.
The UMG8900 supports online report of hardware and software versions, online
software loading, and online patch installation. This feature enables software upgrade
and maintenance without affecting the system running.
The UMG8900 supports version consistency check, manual and automatic version check,
and version rollback.
The UMG8900 provides logs, alarms, traffic measurement, and fault diagnosis functions
to facilitate fault prevention, fault location, and troubleshooting.
The UMG8900 provides tools for information collection, health check, and log analysis,
and supports online and offline analysis and maintenance of the operating status.
The UMG8900 supports the call history record (CHR) function. In this manner, key
information about calls can be recorded and converted into CHRs, and the CHRs can be
stored on the server for value-added applications such as real-time monitoring and fault
location.
The LMT can run on EMS clients to provide remote operation and maintenance.
Perfect Security Design
The security management of the UMG8900 includes two aspects: control data, and operation
and maintenance.
Control data security
The UMG8900 supports backup of important data at the system level. For example, you
can back up configuration data, running data, statistic information, operation information,
management information and running log to the hard disk or compact disk.
Operation and maintenance security
The system defines user groups and rights. Different user groups can customize different
command sets. Through the configuration of command groups and users, the system can
effectively implement hierarchical management of operators and operation rights.
During the operation, the system checks data consistency and gives prompt and
confirmation about operations. This avoids possible damage to the system due to
improper operations.
Network and device management can protect your password and make unauthorized
access invalid. Service data can be accessed only in certain condition. The system
ensures that only authorized users can obtain correct data.
Through the access control list (ACL), you can configure the firewall flexibly to filter
messages of ports that do not provide service. Thus, the system can prevent attackers
from finding system holes through the port scanning technique.
The UMG8900 supports the IP Security (IPSec) protocol. The UMG8900 ensures the
security of services by encryption of transmission data.
Intelligent Power Consumption Reduction
The UMG8900 can monitor and manage the resource boards with high power consumption in
real time. When the resource usage is low, certain boards are automatically powered off for
energy saving and emission reduction.
When service traffic decreases, the UMG8900 analyzes the history records and predicts the
future tendency, and then determines to power off certain resource boards to reduce power
consumption without affecting services. If service traffic and resource usage increase, the
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UMG8900 powers on resource boards gradually to meet the requirements on media resources
when service traffic is heavy.
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3 Product Architectures 3.1 Hardware Architecture
3.1.1 Cabinet Exterior
The UMG8900 is placed in N68E-22 cabinet provided by Huawei. Figure 3-1 shows the front
view of an N68E-22 cabinet.
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Figure 3-1 Front view of an N68E-22 cabinet
The N68E-22 cabinet has a front door and a rear door, and is easy to install.
An N68E-22 cabinet has a 46 U inside space (1 U = 44.45 mm = 1.75 inches). It comprises a
power distribution frame (PDF), three semi-integrated frames, a cabling trough, multiple filler
panels, a rack, multiple guide rails and one or more side hang fiber coilers. It is supplied with
48 V/60 V DC power. It conforms to IEC297 standards and meets the requirement for flexible module configuration.
The N68E-22 cabinet can adopt the front and back maintenance modes, and support upward
and downward cabling modes. The N68E-22 cabinet can be placed and connected with cables
based on the actual conditions of the equipment room.
In addition, the N68E-22 cabinet adopts the standard 19-inch structure. Other frames based on
the standard 19-inch structure can be placed in free space of the cabinet to improve the
utilization of the equipment room.
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3.1.2 Frame Exterior
The UMG8900 supports three types of frames, namely, SSM-256, SSM-160, and SSM-32
frames. These three types of frames are the same in exterior, but their backplanes and main
control boards are different. The SSM-160 frame is introduced in UMG8900 V200R009.
Figure 3-2 shows the front view of an SSM-160 frame.
Figure 3-2 Front view of an SSM-160 frame
An SSM-160 frame has 30 front and back slots in total. In the main control frame, the MOME
and MTND are configured by default. In a service frame, the MMPE and MTND are
configured by default.
A fan box is integrated at the bottom of a cabinet. On the back of a cabinet, there are power
input and monitoring interfaces as well as the dual in-line package (DIP) switches that are
used to set frame No.
The UMG8900 frame is a semi-integrated frame with a fan box. The frame provides front and
back slots in pair to hold boards. The frame is 12U in height and the middle 9U is for boards.
A front board is 9U in height while a back board is 8U. Thus, 1U at the back of the frame is
for the filtering box.
Because a front slot differs from a back slot in height, front and back boards cannot be
inserted crossly.
3.1.3 Hardware Fundamentals
The UMG8900 supports the SSM-256, SSM-160, and SSM-32 frames that can be cascaded in
multiple modes. When the UMG8900 serves as a local exchange, it can connect to an external
shared interworking function (SIWF) frame to provide the interworking function (IWF).
Figure 3-3 shows the hardware components of the UMG8900 when only SSM-160 frames are
configured.
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Figure 3-3 Hardware components (SSM-160 frames)
When the UMG8900 works as a VMSC, it needs to attach an SIWF frame to provide the IWF
function. The frames of the UMG8900 can be logically classified into the main control frame,
service frame, and central switching frame. The main control frame is always numbered 1.
The main control frame can also serve as the central switching frame at the same time.
When only SSM-160 frames are configured, TDM, FE, and GE cascading channels are
available between frames. The UMG8900 supports the cascading capability of 2 x 16 K TDM,
2 x FE, and 2 x GE, up to three SSM-160 frames can be cascaded. The TNDs in the main
control frame are cascaded with the TNDs in the other frames; therefore, no independent
cascading boards are required.
When the SSM-160 frames are configured, independent CLKs are required to provide
stratum-2A and stratum-3 clock signals. The other frames extract required clock signals from
the TDM cascading cables between frames. In this manner, independent clock distribution
cables are not required.
3.1.4 Cabinet Architecture
The UMG8900 supports the UMG8900 assembly cabinet (V200R009; six 48 VDC inputs).
the UMG8900 assembly cabinet (V200R009; six 48 VDC inputs) is used when the UMG8900 and the shared interworking function (SIWF) frame of 2U height need to be
configured in the same cabinet.
The internal components include PDF, SSM frame, and 2 U SIWF. The next figure shows the
full configuration of internal components of the UMG8900 high-density assembly cabinet.
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Figure 3-4 Structure of the UMG8900 assembly cabinet (V200R009; six 48 VDC inputs).
1. Front view 2. Rear view 3. Power distribution frame
4. Filler panel 5. SSM frame 6. Fan box
7. Air frame 8. Ventilation filler panel 9. 2 U IWF frame
10. Horizontal wiring trough
The cabinet is 2200 mm high, 600 mm wide and 800 mm deep. The available space within the
cabinet is 46 U (1 U = 44.45 mm = 1.75 inches).
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A single cabinet is composed of a power distribution frame, service frames, cabling troughs,
filler panels, a cabling rack, slide rails and side hang fiber coilers. The cabinet adopts 48 V/60 V DC power supply. The cabinet conforms to IEC297 standards and supports flexible configuration of modules in it.
A cabinet has a front door and a back door, which enable the device maintenance from both
the front and back of the cabinet.
The UMG8900 supports multi-frame cascading to cover applications from 21 E1s/T1s to
1512 E1s/T1s smoothly. In the large-capacity networking, more than one cabinet is required.
3.1.5 Frame Architecture
The SSM frame of the UMG8900 adopts the semi-integrated structure. A frame is integrated
with a fan box and provides front and back slots in pairs to hold boards.
Figure 3-5 shows the board deployment in an SSM-160 frame.
Figure 3-5 Board deployment in an SSM-160 frame
The exterior of an SSM-160 frame is the same as the exterior of an SSM-256 frame, but they
are installed with different backplanes. Board deployment in an SSM-160 frame is described
as follows:
Back slots 7 and 9 can be installed with the TNDs only. Each TND occupies two slots;
therefore, back slots 6 and 8 cannot be installed with other boards.
Front slots 7 and 8 can be installed with only the main control boards OMEs or MPEs.
Each OME or MPE occupies one slot. The OMEs are always installed in the main
control frame, and the MPEs are always installed in other SSM-160 frames.
Front slots 6 and 9 can be installed with only the CMEs that correspond to the physical
boards MCMEs.
Common slots are for service processing boards. The CLKs must be installed in back
slots 0 and 1 in the main control frame.
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CAUTION
For a board that requires a corresponding back board, if a front slot is inserted with a specified
service board, the corresponding back slot must be inserted with an interface board.
For details about board configuration, see the online help for MML commands.
3.1.6 Logical Fundamentals
Figure 3-6 shows the logical components of the hardware of an SSM-160 frame.
Figure 3-6 Logical components of the SSM-160 hardware
The UMG8900 accesses and processes IP/ATM/TDM bearer services, exchanges media
gateway control data with the softswitch, processes media resources and performs adaptation
and transparent transmission of signaling. The UMG8900 also provides auxiliary functions
such as the management and maintenance of the device, the clock and cascading functions.
Based on the functions and the distributed modular architecture, the hardware system of the
UMG8900 can be divided into the media gateway control and management module, TDM
processing module, service resource module, packet processing module, signaling adaptation
module and cascading module.
These modules are described as follows.
Gateway Control and Management Module
The gateway control and management module mainly performs the following two functions:
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Under the control of the gateway controller, this module invokes various bearer and
service resources within the UMG8900, sets up service bearers and processes service
stream formats.
This module is responsible for the management and maintenance of the UMG8900. The
UMG8900 adopts the client/server mode. The client LMT connects with the BAM of the
UMG8900 to maintain and manage the UMG8900.
The CMU board provides the gateway control function. The OMU/TNU board provides the
management and maintenance function.
The physical board corresponding to the CMU is the MCME. The physical board
corresponding to the OMU is the MOME. The physical board corresponding to the TNU is
the MTND.
Packet Processing Module
The packet processing module includes two parts: packet switching, and packet processing
and interface.
The packet switching module switches packet services of the gateway. In the SSM-160 frame,
the packet switching function is implemented by the control and management module OMU
or MPU. In an SSM-160 frame, the corresponding physical board is the MOME or MMPE.
For the SSM-160 frame, the packet switching module provides 48 GE packet switching
capability.
The packet processing and interface module processes packet service bearers of the gateway
and provides hardware interfaces for packet services.
The UMG8900 provides packet service bearer modes: IP, ATM, and IPoE1. The three modes
correspond to different hardware types of boards for the bearers.
The hardware of the IP packet processing mainly includes the HRB The corresponding
physical boards are the MHRD.
The hardware of the ATM packet processing and interface module mainly includes the ASU,
A4L, EAC, and TAC. The corresponding physical boards are the MASU, MA4L, MEAC, and
MTAC.
TDM Processing Module
The TDM processing module includes three parts: TDM interface, clock processing and TDM
switching.
The TDM interface module provides TDM interfaces of the UMG8900 and supports
extracting line clocks as clock reference sources. The TDM interface module mainly includes
the E63, T63, PIE, S4L, and S8L boards. The corresponding physical boards are the ME63,
MT63, MPIE, MS4L and MS8L.
The clock processing module provides clock signals required and supports access of various
clock reference sources. The clock processing module mainly includes the CLK and the
corresponding physical board is the MCLK.
Clock signals are provided by the CLK. Stratum-2A and stratum-3 clock signals can be
provided.
The TDM switching module is implemented by the TNU that corresponds to the physical
board MTND.
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Service Resource Module
The service resource module processes media stream formats and provides resources for
service connection.
The hardware of this module mainly includes the VPU and ECU boards. The ECU provides
the echo cancellation (EC) function. The VPU provides announcement playing, digit
collecting and audio mixing functions. In addition, the VPU can provide all the functions of
the ECU. The corresponding physical boards are the MVPD and MECU.
Signaling Adaptation Module
The signaling adaptation module adapts the signaling of the wireless access network and
PSTN to the signaling of the IP packet network.
This module cooperates with the TDM processing module, packet processing module and
gateway control and management module to adapt and forward signaling.
This module includes the SPF. The corresponding physical board is the MSPF.
Cascading Module
The UMG8900 supports different application capacities through the single-frame and
multi-frame cascading modes. The cascading module provides the cascading of packet, TDM
and control service streams in the multi-frame cascading mode.
The cascading module consists of the packet service processing sub-module and TDM service
processing sub-module and contains the TNU and OMU/MPU. The TNU and OMU/MPU
correspond to the physical boards MTND and MOME/MMPE.
3.1.7 Boards of All SSM Frames
Table 3-1 Equipment and resource management units
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Operation &
Maintenance
Unit (OMU)
Media gateway
Operation &
Maintenance Unit
(MOMU)
Master/sla
ve
The MOMUs are
used in the SSM-256
frame.
The MOMUs are
inserted in front slots
7 and 8 in the main
control frame.
The corresponding
back board is the
NET.
The OMU
manages all the
frames of the
MGW in the
case of
multi-frame
cascading.
The OMU
implements the
switching
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Media gateway
Operation &
Maintenance Unit
B (MOMB)
Master/sla
ve
The MOMBs are
used in the SSM-32
frame.
The MOMBs are
inserted in front slots
6, 7, 8, and 9 in the
main control frame.
Each board occupies
two slots.
The corresponding
back board is the
MTNC.
function of the
data planes for
broadband
services.
The OMU
provides the
external
interfaces
including the
Console
interface.
Operation &
Maintenance
Unit (OMU)
Media gateway
Operation &
Maintenance Unit
Enhanced
(MOME)
Master/sla
ve
The MOMEs are
used in the SSM-160
frame.
The MOMEs are
inserted in front slots
7 and 8 in the main
control frame.
The corresponding
back board is the
MTND.
The OMU
manages all the
frames of the
MGW.
Main
Processing
Unit (MPU)
Media gateway
Main Processing
Unit (MMPU)
Master/sla
ve
The MMPUs are
used in the SSM-256
frame.
The MMPUs are
inserted in front slots
7 and 8 in the frames
except the main
control frame.
The corresponding
back board is the
NET.
The MPU
manages the
boards in the
frame where the
MPU is located.
The MPU
implements the
switching
function of the
data planes for
broadband
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Media gateway
Main Processing
Unit B (MMPB)
Master/sla
ve
The MMPBs are
used in the SSM-32
frame.
The MMPBs are
inserted in front slots
6, 7, 8, and 9 in the
service frame.
Each board occupies
two slots.
The corresponding
back board is the
MTNC.
services.
Main
Processing
Unit (MPU)
Media gateway
Main Processing
Unit Enhanced
(MMPE)
Master/sla
ve
The MMPEs are
used in the SSM-160
frame.
The MMPEs are
inserted in front slots
7 and 8 in the
service frame.
The corresponding
back board is the
MTND.
The MPU
manages the
boards in the
frame where the
MPU is located.
Connection &
Management
Unit (CMU)
Media gateway
Connection
Maintenance Front
Unit (MCMF)
Master/sla
ve
The MCMFs are
used in the SSM-256
frame or SSM-32
frame.
The MCMFs are
inserted in common
front slots.
No corresponding
back board is
required.
The CMU
processes
messages of the
media resource
control protocol
and operates the
corresponding
resources.
Media gateway
Connection
Maintenance Back
unit (MCMB)
Master/sla
ve
The MCMBs are
used in the SSM-256
frame or the SSM-32
frame.
The MCMBs are
inserted in common
back slots.
No corresponding
front board is
required.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Connection &
Management
Unit (CMU)
Sub-card of
Connection &
Management Unit
(SCMU)
Master/sla
ve mode
in paired
slots
The SCMUs are
inserted in two
subboard slots on the
UG02MOMB or
UG02MMPB in the
SSM-32 frame.
The CMU
processes
messages of the
media resource
control protocol
and operates the
corresponding
resources.
Connection &
Management
Unit (CMU)
Media gateway
Connection &
Management
Express Unit
(MCME)
Master/sla
ve
The MCMEs are
used in the SSM-160
frame.
The MCMEs are
inserted in front slots
6 and 9 by
preference, and can
also be configured in
other slots.
No corresponding
back board is
required.
The CMU
processes
messages of the
media resource
control protocol
and operates the
corresponding
resources.
Protocol
Processing
Unit (PPU)
Media gateway
Back Protocol
Processing Unit
(MPPB)
Load
sharing
The MPPBs are used
in the SSM-256
frame or the SSM-32
frame.
The MPPBs are
inserted in common
back slots.
No corresponding
front board is
required.
The PPU
processes the
H.248/SCTP/U
DP/TCP/IP
protocols.
The PPU
provides
external
interfaces
including the
FE interface.
Media gateway
Connection
Maintenance Front
Unit (MCMF)
Load
sharing
The MCMFs are
used in the SSM-256
frame or SSM-32
frame.
The MCMFs are
inserted in common
front slots.
No corresponding
back board is
required.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Media gateway
Connection
Maintenance Back
unit (MCMB)
Load
sharing
The MCMBs are
used in the SSM-256
frame or SSM-32
frame.
The MCMBs are
inserted in common
back slots.
No corresponding
front board is
required.
Protocol
Processing
Unit (PPU)
Sub-card of
Connection &
Management Unit
(SCMU)
Master/sla
ve mode
in paired
slots
The SCMUs are
inserted in two
subboard slots on the
UG02MOMB or
UG02MMPB in the
SSM-32 frame.
The PPU
processes the
H.248/SCTP/U
DP/TCP/IP
protocols.
Table 3-2 Service and protocol processing units
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
High-speed
Routing Unit
(HRB)
Media gateway
High-speed
Routing Unit
(MHRU)
Master/sl
ave
The MHRUs are
used in the SSM-256
frame or SSM-32
frame.
The MHRUs are
inserted in common
front slots.
The corresponding
back interface board
is the E8T/E1G.
The HRB
forwards
RTP/RTCP/IP
bearer services.
High-speed
Routing Unit
(HRB)
Media gateway
RTP Processing
Unit (MRPU)
Master/sl
ave
The MRPUs are used
in the SSM-256
frame or SSM-32
frame.
The MRPUs are
inserted in common
front slots.
The corresponding
back interface board
is the E8T/E1G.
The HRB
processes IP
routes, and
converges and
distributes IP
services.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
High-speed
Routing Unit
(HRB)
Media gateway
High-speed
Routing Unit D
(MHRD)
Master/sl
ave
The MHRDs are
used in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MHRDs are
inserted in common
back slots.
The corresponding
back interface
subboard is the
D8FT/D1GO.
The HRB
processes IP
routes, and
converges and
distributes IP
services.
The HRB
provides access
services.
High-speed
Routing Unit
(HRB)
Media gateway IP
over E1 Unit
(MIOE)
Master/sl
ave
The MIOEs are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MIOEs are
inserted in common
front slots.
The HRB
implements the
IP over E1
function.
When the
MIOE is used
in the SSM-256
frame, the
MTNB rather
than the
MTNU/TCLU
can be
configured.
IP Forward
Unit (IFU)
Media gateway
High-speed
Routing Unit
(MHRU)
Load
sharing
The MHRUs are
used in the SSM-256
frame or SSM-32
frame.
The MHRUs are
inserted in common
front slots.
The corresponding
back interface board
is the E8T.
The IFU
implements the
function of
reporting
CHRs.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
IP Forward
Unit (IFU)
Media gateway
High-speed
Routing Unit D
(MHRD)
Load
sharing
The MHRDs are
used in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MHRDs are
inserted in common
back slots.
The corresponding
back interface
subboard is the
D8FT.
The IFU
implements the
function of
reporting
CHRs.
ATM
AAL2/AAL
5 SAR
Processing
Unit (ASU)
Media gateway
ATM AAL2/AAL5
SAR Processing
Unit (MASU)
Master/sl
ave
The MASUs are used
in the SSM-256
frame or SSM-32
frame.
The UG02MASUs
are used in the
SSM-160 frame.
The MASUs are
inserted in common
front slots in the
main control frame
or the service frame.
The corresponding
back board is the
A4L/EAC/TAC.
The ASU
processes ATM
services.
Front
Signaling
Processing
unit (SPF)
Media gateway
Front Signaling
Processing unit
(MSPF)
Load
sharing
The UG01MSPFs are
used in the SSM-256
frame.
The
UG02MSPF/UG03M
SPF/UG04MSPFs
are used in the
SSM-256 frame or
SSM-32 frame.
The UG04MSPFs are
used in the SSM-160
frame.
The MSPFs are
inserted in common
front slots.
No corresponding
back board is
required.
The SPF
performs
signaling
adaptation and
transfers
signaling.
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Table 3-3 Switching and cascading units
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Packet
switch Unit
(NET)
Media gateway
Packet switch
Unit (MNET)
Master/sl
ave
The MNETs are used
in the SSM-256
frame.
The MNETs are
inserted in back slots
7 and 8.
The corresponding
front board is the
MPU/OMU.
The NET
implements the
packet service
switching
function.
The NET
implements the
data cascading
function
between
frames.
The NET
provides
external
interfaces
including the 2
x GE, 4 x FE,
Clock, MIR,
and OMC
interfaces.
Front Link
Unit (FLU)
Media gateway
Front Link Unit
(MFLU)
No
backup
The MFLUs are used
in the SSM-256
frame.
The MFLUs are
inserted in common
front slots in the
central switching
frame.
The FLU and
BLU provide
32K cascading
capacity, and
interfacing and
switching
functions in the
TDM
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Copyright Huawei Technologies Co., Ltd.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Back Link
Unit (BLU)
Media gateway
Back Link Unit
(MBLU)
Master/sl
ave
The MBLUs are used
in the SSM-256
frame.
The MBLUs are
inserted in common
back slots in the
central switching
frame.
narrowband
data plane.
The FLU and
BLU provide 2
x 1.25 Gbit/s
cascading
capacity and
interfacing
function in the
broadband data
plane.
The BLU
provides 100
Mbit/s IP
control data
channels to
directly connect
frames.
The BLU
provides
cascading
interfaces.
Net Link
Unit (NLU)
Media gateway Net
Link Unit (MNLU)
Load
sharing
The MNLUs are
used in the SSM-32
frame.
The MNLUs are
inserted in back slots
4 and 5 and back
slots 10 and 11.
The NLU
provides 2 x
1.25 Gbit/s or 1
x 1.25 Gbit/s
cascading
capacity and
interfacing
function in the
broadband data
plane.
TDM central
switching
Net Unit
(TNU)
Media gateway
TDM switching Net
Unit (MTNU)
Master/sl
ave
The MTNUs are
used in the SSM-256
frame.
The MTNUs are
inserted in back slots
6 and 9.
No corresponding
front board is
required.
The TNU
implements
TDM service
switching.
The MTNU or
TCLU provides
3 x 8K TDM
cascading
interfaces and
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Product Description
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Copyright Huawei Technologies Co., Ltd.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
TDM Convergence
& Link Unit
(TCLU)
Master/sl
ave
The TCLUs are used
in the SSM-256
frame.
The TCLUs are
inserted in back slots
6 and 9 in the main
control frame or the
service frame.
24K TDM
timeslot
cascading
function.
The MTNB
provides 32K
timeslot
cascading
capacity.
The MTNC
provides the
TDM/FE
cascading
interfaces and
provides the
Mc/OMC/Cloc
k interfaces.
The MTNC
provides 4 x 8K
timeslot
cascading
capacity. The
MTNC
provides the FE
switching
function for the
control plane.
The MTNC
provides
multi-frame
cascading
channels for the
FE plane and
the TDM
service plane.
The MTNC
manages the
boards in the
frame where
the MTNC is
located. The
MTNC
provides
stratum-3 clock
signals for the
system through
the clock
subboard.
Media gateway
TDM switching Net
Unit B (MTNB)
Master/sl
ave
The MTNBs are used
in the SSM-256
frame.
The MTNBs are
inserted in back slots
6 and 9.
No corresponding
front board is
required.
Media gateway
TDM switching Net
Unit C (MTNC)
Master/sl
ave
The MTNCs are used
in the SSM-32 frame.
The MTNCs are
inserted in back slots
6, 7, 8, and 9.
Each board occupies
two slots.
The corresponding
front board is the
MOMB/MMPB.
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UMG8900 V200R009C02
Product Description
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Copyright Huawei Technologies Co., Ltd.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
TDM central
switching
Net Unit
(TNU)
Media gateway
TDM switching Net
Unit D (MTND)
Master/sl
ave
The MTNDs are
used in the SSM-160
frame.
The MTNDs are
inserted in back slots
7 and 8.
Each board occupies
two slots.
The corresponding
front board is the
MOME/MMPE.
The MTND
implements
TDM service
switching and
provides 160K
timeslot
switching
capacity.
The MTND
provides 2 x 8K
or 4 x 8K TDM
cascading
interfaces, 4 x
GE cascading
interfaces, and
4 x FE
cascading
interfaces.
The MTND
provides
management
functions for
the frame.
Table 3-4 Interface units
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
1-port GE
Optical
interface
card (E1G)
Media gateway
one-port GE
Optical interface
card (MG1O)
No
backup
The MG1Os are used
in the SSM-256
frame or SSM-32
frame.
The MG1Os are
inserted in common
back slots.
The corresponding
front board is the
HRB.
The E1G
provides one
GE interface.
2*155M
SDH/SONE
T optical
interface
card (S2L)
Media gateway
2*155M
SDH/SONET
optical interface
card (MS2L)
Master/sl
ave or
load
sharing
The UG01MS2L and
UG01MS2E can be
used only in the
SSM-256 frame.
The UG02MS2L can
The MS2L
provides two
155 Mbit/s
SDH optical
interfaces.
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Product Description
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Copyright Huawei Technologies Co., Ltd.
Page 38 of 67
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Media gateway
2*155M
SDH/SONET
Electronical
interface card
(MS2E)
Master/sl
ave or
load
sharing
be used in the
SSM-256 frame or
SSM-32 frame.
The UG02MS2E can
be used in the
SSM-256 frame,
SSM-160 frame or
SSM-32 frame.
They are inserted in
common back slots.
No corresponding
front board is
required.
The MS2E
provides two
155 Mbit/s
SDH electrical
interfaces.
1*155M
SDH/SONE
T optical
interface
card (S1L)
Media gateway
1*155M
SDH/SONET
optical interface
card (MS1L)
Master/sl
ave or
load
sharing
They are used in the
SSM-32 frame.
They are inserted in
common back slots.
No corresponding
front board is
required.
The MS1L
provides one
155 Mbit/s
SDH optical
interface.
The MS1E
provides one
155 Mbit/s
SDH electrical
interface.
Media gateway
1*155M
SDH/SONET
Electronical
interface card
(MS1E)
Master/sl
ave or
load
sharing
4*155M
SDH/SONE
T optical
interface
card (S4L)
Media gateway
4*155M
SDH/SONET
optical interface
card (MS4L)
Master/sl
ave or
load
sharing
The MS4Ls are used
in the SSM-160
frame.
The MS4Ls are
inserted in common
back slots.
It must be used
together with the
MTND.
The MS4L
provides four
155 Mbit/s
SDH optical
interfaces.
4 Ports
STM-1 ATM
Optical
Interface
Board (A4L)
Media gateway 4
Ports STM-1 ATM
Optical Interface
Board (MA4L)
No
backup
The MA4Ls are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MA4Ls are
inserted in common
back slots.
The corresponding
front board is the
ASU.
The MA4L
provides four
155 Mbit/s
ATM optical
interfaces.
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Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
8-port
10/100M
Ethernet
interface
board (E8T)
Media gateway
8-port 10/100M
Ethernet Interface
Board (ME8T)
No
backup
The ME8Ts are used
in the SSM-256
frame or SSM-32
frame.
The ME8Ts are
inserted in common
back slots.
The corresponding
front board is the
HRB.
The ME8T
provides eight
FE interfaces.
32*E1 port
TDM
interface
board (E32)
Media gateway
32*E1 ports TDM
interface board
(ME32)
Load
sharing
They are used in the
SSM-256 frame or
SSM-32 frame.
They are inserted in
common back slots.
No corresponding
front board is
required.
The ME32
provides 32 E1
interfaces to
extract line
signaling from
CAS such as
R2 and China
No.1 or to
insert line
signaling into
them.
32*E1 port
TDM
interface
board (E32)
Media gateway
32*E1 interface
card with Signaling
function Unit
(MESU)
Load
sharing
They are used in the
SSM-256 frame,
SSM-160 frame or
SSM-32 frame.
They are inserted in
common back slots.
No corresponding
front board is
required.
The MESU
provides 32 E1
interfaces to
receive and
send SS5 line
signaling and
register
signaling.
The MESU can
process R1.5
signaling.
63*E1 port
TDM
interface
board (E63)
Media gateway
63*E1 ports TDM
interface board
(ME63)
Load
sharing
The ME63s are used
in the SSM-160
frame.
The ME63s are
inserted in common
back slots.
No corresponding
front board is
required.
The ME63
provides 63 E1
interfaces.
The ME63 can
process R2/R1
signaling.
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UMG8900 V200R009C02
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
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Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
32*T1 port
TDM
interface
board (T32)
Media gateway
32*T1 ports TDM
interface board
(MT32)
Load
sharing
The MT32s are used
in the SSM-256
frame or SSM-32
frame.
The MT32s are
inserted in common
back slots.
No corresponding
front board is
required.
The MT32
provides 32 T1
interfaces to
extract line
signaling from
CAS such as
R2 and China
No.1 or to
insert line
signaling into
them.
32*T1 port
TDM
interface
board (T32)
Media gateway
32*T1 interface
card with Signaling
function Unit
(MTSU)
Load
sharing
The MTSUs are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MTSUs are
inserted in common
back slots.
No corresponding
front board is
required.
The MTSU
provides 32 T1
interfaces to
receive and
send SS5 line
signaling and
register
signaling.
63*T1 port
TDM
interface
board (T63)
Media gateway
63*T1 ports TDM
interface board
(MT63)
Load
sharing
The MT63s are used
in the SSM-160
frame.
The MT63s are
inserted in common
back slots.
No corresponding
front board is
required.
The MT63
provides 63 T1
interfaces.
The MT63 can
process R2/R1
signaling.
PDH
Interface
Electronical
Unit (PIE)
Media gateway
PDH Interface
Electronical Unit
(MPIE)
Master/sl
ave or
load
sharing
The MPIEs are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MPIEs are
inserted in common
back slots.
No corresponding
front board is
required.
The MPIE
provides three
E3/T3 PDH
electrical
interfaces.
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UMG8900 V200R009C02
Product Description
Issue 1.0 (2013-04-09) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
Page 41 of 67
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
32-port E1
ATM
Interface
Card (EAC)
Media gateway
32-port E1/T1
ATM Interface
Card (MEAC)
No
backup
The MEACs are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MEACs are
inserted in common
back slots in the main
control frame or the
service frame.
The corresponding
front board is the
ASU.
The MEAC
provides 32
IMA E1
interfaces.
32-port T1
ATM
Interface
Card (TAC)
Media gateway
32-port T1 ATM
Interface Card
(MTAC)
No
backup
The MTACs are used
in the SSM-256
frame, SSM-160
frame or SSM-32
frame.
The MTACs are
inserted in common
back slots in the main
control frame or the
service frame.
The corresponding
front board is the
ASU.
The MTAC
provides 32
IMA T1
interfaces.
Backup
32-port
E1/T1 ATM
interface
card (BEA)
Media gateway
Network Backup
32-port E1/T1
ATM Interface
Card (MBEA)
No
backup
The MBEAs are used
in the SSM-256
frame or SSM-32
frame.
The MBEAs are
inserted in common
back slots in the main
control frame or the
service frame.
The corresponding
front board is the
ASU.
The BEA
provides
backup
functions for
the EAC/TAC.
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UMG8900 V200R009C02
Product Description
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Copyright Huawei Technologies Co., Ltd.
Page 42 of 67
Table 3-5 Media resource processing units
Board Name Backup Mode
Board Position Function
Logical Board
Physical Board
Voice
Processing
Unit (VPU)
Media gateway
Voice Processing
Unit B (MVPB)
Load
sharing
The MVPBs are used
in the SSM-256
frame.
The MVPBs are
inserted in common
front slots.
No corresponding
back board is
required.
The VPU
works with
voice
subboards. The
VPU provides
the transcoding
and EC
functions for
voice service
streams.
The VPU
provides
announcement
playing
resources to
implement the
digit-collecting
and
announcement-
playing
services.
Media gateway
Voice Processing
Unit D (MVPD)
Load
sharing
The MVPDs are used