Dxx General

8/13/2019 Dxx General

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By : Lecturer

Telecom. Staff College Haripur.


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DXX SYSTEM

Bandwidth Manager.

DXX node can be described as a digital

MUX equipped with several Trunks andAccess interfaces.

Often referred to as a flexible

multiplexer orFlexMux", reflecting theflexible implementation of differentinterface connections.


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DXX SYSTEM

The DXX cancross-connectany E1 line inthe system

with any otherE1 line in thesystem

Provides cross

connectionsfrom timeslotlevel to bitlevel


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DXX System (Contd.)

Enables the provision of lower/sub rate trafficas compared to other media e.g., from DigitalExchanges we can provide only Analog voice,

BRI (2B+D) i.e 128Kbps and PRI (30B+D).

Can provide a variety of data and speechbands sub and Super-rate multiplexing up to2Mb/s

Supports all modern technologies e.g, ATM, FR& ISDN.


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Data Transmission Medias.

Dial Up.

ISDN.

Local Area Net Work (LAN / WAN).Digital Cross Connect (DXX).

Digital Subscriber Line (xDSL).

Optical Fiber Access Network (OFAN).


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Dial Up.

A component in Windows 95and Windows 98thatenables you to connect your computer to a network via amodem.

If your computer is not connected to a LAN, and you want toconnect to the Internet, you need to configure Dial-UpNetworking (DUN)to dial a Point of Presence (POP)and log intothe Internet Service Provider (ISP). ISP will need to providecertain information, such as the gateway address and yourcomputer's IP address. (Now it is supported automatically)

You access (DUN) through the My Computericon. Differentprofiles (called a connectiod)for different online services can beconfigured. Once configured, a connectiod shortcut can becopied to a desktop. By double-clicking the connectiod icon, aconnection can be established.


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ISDN.

The Integrated Services Digital Network(ISDN) is a set of international standards foraccess to advanced, all-digital publictelecommunications networks. The key

elements of this definition are:

Integrated Services:

Digital:

Network:


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Voice.

Video.

Image.

Data.

Mixed media at a number of standard

data rates

Integrated Services


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Digital terminal equipment.

Digital local loops.

Digital trunks.

Digital switching.

Digital signaling.

Digital


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Worldwide, interoperating communications fabric

under distributed control using common standards.

ISDN standards have been defined by the ITU-T , a

branch of the United Nations' International

Telecommunications Union (ITU), in the series I

and Q recommendations.

Network


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ISDN (BRI).

Basic RateAccess (2B+D)

It contains two Bearer (B) channels 64 Kbpsand one signaling channel (D) 16 Kbps.

So that a total bit rate of 144 Kbps is

available on a single twisted copper pair.

Bearer channels are basically for voice or Dataand D channel Is for signaling.


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ISDN (PRI).

Primary rate Access (30B + D)

For Broad band services

It contains thirty Bearer (B) channels 2 Mbps

and one signaling channel (D) 64 Kbps.Switch

V

Phone Company

ET LT U

TE1

S/T Bus

ISDN Video

Phone

TA

Non-ISDN

Devices

R

NT-1


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Key Features of DXX

The DXX provides a complete networkingsolution to the network operators withthe following benefits:

Efficient utilization of existing

transmission bandwidth.Powerful NMS to manage largenetworks.The best flexibility for networking.

Manageability.Expandability.Higher service quality and hence highercustomer satisfaction.


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Key Features of DXX

DXX (Digital)

Super rate :-Multiplexing of = > 64 K bits / Sec.

Sub-rate :-Multiplexing of < 64 K bits / Sec.


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DXX APPLICATIONS

Most typical DXX applications are:

Data applications.

Voice applications.


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DXX DATA APPLICATIONS

Data Applications include :-

Leased line data circuits.LAN LAN interconnection.

Point to Point data.

Point to multipoint data.Paging Systems.


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Bridge orRouter

Bridge orRouter

E-1

LAN A LAN B


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CPE

Customer owns or leases the Equipment at all end points.Arranges for the WAN connections from a service provider.

CPE

NODE A

NODE B


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- Multimedia i.e Video Conference or to Broad castingcentre. Banking (ATM), Paging System etc.

- Common Interface speeds for compression 384 Kbpsand 768 Kbps.

NODE B NODE AVideo

CameraVideoCodec

CompressedVideo

VideoCodec

VideoMonitor

6 MHz.

CompressedVideo

BACKBONE


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PSTN

Paging

ControlCentre

PagingTerminal

Paging

Terminal

PagingTerminal

City 1

City 2

City N

Landline link

Landline link

Satellite link

Comm. Tower


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DXX VOICE APPLICATIONS

Voice Applications include:-

Telephone Line/Number Extension.

Hot line.PBX extension.

Voice compression.

Between mobile switching centers.

PSTN PSTN.


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NODE A NODE B

EX.BackBonePSTN

CCO CCS


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NODE A NODE B

BackBone

CCO CCS


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NODE A NODE B

BackBone

CCO CCS

P B X

PBX is located at customer site.


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City 1

Digital Access And Cross Connect Systemacts asa cross over point (Transit Function) for circuitsterminating at the end nodes.

City 2

City N

City 1

City 2

City N

STM-1/E-1


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DXX APPLICATIONS IN MOBILE

Analog / Digital mobiletraffic between mobile

exchanges.Voice compression.

Data traffic.

LAN interconnection.

Bandwidth optimization.


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Comm. Tower

DXX NODE

DXX NODE

DXX NODE DXX NODE

Comm. Tower

2 Mbps

2 Mbps 2 Mbps

2 Mbps

Comm. Tower

Comm. Tower

Comm. Tower

B.S

B.S

B.S

B.S

B.S

Back Bone

Alarms

Alarms

Alarms

Alarms

DXX Applicationin Mobile


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DXX APPLICATIONS


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Advantages of DXX

Efficient utilization of existingtransmission bandwidth/infrastructure.

Compatible with new emergingstandards and future technologies.

Video conferencing, integrated voice,

data management, ISDN, ATM, FrameRelay and SDH back bone network onsame platform.


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Advantages contd

During a major fault, traffic can be re-routedautomatically, so that existing traffic is un-affected

The operator can also assign various servicecategories to the customers so that theoperator's most valuable business is alwaysprotected

Both of the systems Newbridge & Tellabs havecompatibility for frame relay and ATMtechnology, which is expected to come toPakistan in near future


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Existing DXX Network

In PTCL, presently three systemsare being used for the provision ofDXX facilities to the subscribers :

1. MARTIS DXX (TELLABS).

2. NEWBRIDGE (MAINSTREET).

3. Loop Telecom.


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Planned Expansion in DXX Network

Cities ----------- 100 to 150 +

Sites ------------ 200 to 300 +

Nodes ------------ 205 to 450 +


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DXX Systems in Pakistan.

Vendor . Nodes SystemSoftware.

Tellabs/Martiss DXX. 129 Windows NTBased.

Newbridge 131 Solaries O.S.

Loop Telecom. 421 Windows2000 Based.


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Cards used in a DXX System.

Media / Back Bone Cards.

System, Control and Cross Connection cards.

Line Driving / Access or Subscriber Cards.


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Dxx General

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