Obe000000 v5 Interface Issue2.1

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OBE000000 V5 INTERFACEISSUE 2.1

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HUAWEI TECHNOLOGIES CO., LTD.

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Chapter 1 Overview of V5 Chapter 2 Basic concepts Chapter 3 Sub-protocols of V5 Chapter 4 Application example


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Page 1

Introduction: Z interface

Z interface

LE

Z interface: 2-wire analog interface Traditionally, POTS subscribers are connected directly to LE via Z interface


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Introduction: Z interface

LE

Digital MUX

With the emerging of digital MUX and digital terminal, there is a requirement for digital interface


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Introduction: What is V5?

V5 LE AN

V5 is the digital interface between LE and AN which is standard and open for narrow band service, classified as V5.1 and V5.2 V5.2: ITU-T Recommendation G.965


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V5.2 interface in HONET/C&C08C&C08V5.2 INTERFACE

MD5500/PVU

LELE

D T F

E1 D T 16

AN AN

In HONET V6 System:

> CESH/DT16 support V5.2 > PVU support V5.2


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Physical Compositon(1)

E1 link 1 E1 link 2

LEE1 link 16

AN

V5.2

V5.2

Maximum 16 E1 links in one V5.2 interface


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Physical Compositon(2)

...

TS0

TS1

TS15 TS16

TS30 TS31 TS0

...

ONE FRAMEE1 frame is divided into 32 TDM slots. They are numbered as TS0,TS1.... TS31, rate is 64Kb/s. TS0 : for frame synchronization only TS1 to TS31: can carry PCM encoded voice information TS16/15/31: can be used to carry V5 protocolPage 8


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Two important concept Physical communication Channel (PCC):

> A TS on a V5.2 interface provisioned to carry protocol information Bearer channel:

> A TS to provide the bi-directional transmission capability for voice information.


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About ISDN V5.2 interface support both BRA and PRA

V5.2 just transfers the information to LE transparently.


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Rules for the Selection of Physical C ChannelsTS0 TS1

...... TS14 TS15 TS16 TS17 ...... n+1 1 ...... n+3 2 ...... n+5 3...... ......3n-1 n

...... ............ ...... ......

TS30 TS31

n+2 n+4 n+6

3n

E1nmaximum 48 TS worked as Physical C Channel.


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Sub-protocols of V5.2 V5.2 interface includes 5 protocols, they are:

> PSTN > BCC (Bearer Channel Connection) > CONTROL > LINK CONTROL > PROTECTION


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two kinds of physical C channel

PROTECTION

Physical C Channel

Type 1 carry protection protocol only, protection C channel

According to allocated the V5.2 sub-protocol, there are two kinds of physical C channel


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two kinds of physical C channelPSTN

BCC CONTROL L-CONTROLType 2 carry BCC/control/l-control, or PSTN/ISDN, logical c-channel (LCC) Attention, maybe you have many LCCs 1) BCC, control, l-control must be carried in the same LCC and only one LCC for them. 2) Usually only one LCC for PSTN, and the TS can be the same LCC as that of 1) 3) ISDN can be carried transparently by many LCC.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 14

Physical C Channel

Primary link and secondary linkTS31

TS0Primary link Secondary link Other link

...... ...... ......

Primary link: Only one TS is selected to carry BCC/control/l-control protocol, the E1 contain the TS is named primary link. when the V5 interface is up, the TS will be used to transfer protocol data. Secondary link: TS reserved to protect the primary link


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protection group, active/standby link(active link) (standby link)

BCC/control/l-control/protection/(PSTN) PCC1 protection PCC2 ISDN PCC3

PGI

PGII

ISDN PCC4 protection PCC5(active link) (standby link)

In one V5 interface, it must has protection group I, which is made by two Physical C channel, one is the LCC to carry BCC/control/l-control (active link), the other one is the protection physical C channel (standby link). The other physical C channel belongs to Protection group II, in which can has many LCC and maximum 3 protection physical C channel.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 16

Configuration data0E1 link 1 E1 link 2 E1 link n

0 1 n

LE

1 n

AN LE

LCC ID link ID V5 ID** ID: a integer assigned at the two ends which must be equal; Different V5/link/LCC has different ID.


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SummaryE1 port 16 17 18 secondary link Primary link Link ID 0 1 2 TS15 16 31 1 5 1 6 1 3 5 1 1 6 3 1

LCC-ID PGI active link PGI standby link16 0 17 18 6553 5 19 20 2 21

PSTN ID0

V5 ID 1 28 12

PGII active link15 16 31 15 16 31 15 16 31 15 16 31 40 12 41 42 13 65535 44 14 65535 46 15 65535

29 30 31

13 14 15

PGII standby link PGII standby link PGII standby link All rights reserved Page 18


the minimum requirements for V5 interface(active link) Link ID: 5 (standby link)

BCC/control/l-control/PSTNTS 16 E1 port: 1 TS15

LCCID: 0 protection LCCID: 1

PGIWith the TS16 and TS15 of one E1, V5 interface can be up


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PSTN protocol

v5 LE LEdigital

AN ANanalog

analog

The connection of LE and PSTN ports


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L3 address

V5 interface Digital

MUX

LE LEConfigurations of LE

L3 address=100 off hook

AN1) Slot 5 physical port 15

Configurations of AN

2) Slot 5 physical port 15s L3 address=100 4) L3 address=100s number is 55558888


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BCC protocol(1) This protocol enables V5.2 interface bearer channels to be allocated

or de-allocated based on a call. The BCC protocol provides the means for the LE to request the AN to

establish and release connections between a specific AN user port and a specific V5.2 interface bearer channel.


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BCC protocol(2)TS10

LINKID:0

TS10

A B C

TS26 LINKID:0

TS26TS10LINKID:2

TS10

LE

AN

These three telephones are busy, the BCC protocol has allocated a bearer channel (time slot) for each of them


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CONTROL protocol(1) The control protocol is composed of a subscriber port control part and

a V5 interface common control part. Port control:

> If a user's service is interrupted by a system fault or a maintenance operation, this user port must be blocked. After the recovery of system fault or the maintenance operation ended, the user port must be unblocked.


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CONTROL protocol(2) Common control:

> An important function of CONTROL protocol is to verify V5 ID. > V5 ID: a integer(0~224-1) assigned to both side of V5.2 interface which must be equal. > When the V5.2 interface start or restart, the control protocol will verify the V5ID on both sides. If the verification is not success, the start process will be terminate.


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LINK control protocol(1) Since the V5.2 interface may consist of multiple 2048 kbit/s links, there

is a need for link verification and for blocking /unblocking of a specific link. Three procedures have been defined for these functions and

performe a specific link management at both sides of V5.2 interface. > Link blocking & unblocking > Events and failure reports > Link identification


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PROTECTION protocol According to protocol architecture and multiplexing structure, a

communication channel may carry information associated to several E1 links. The failure of a communication channel could affect the service of a large number of customers in abnormal. This is in particular true for the BCC protocol.

In order to improve the reliability of the V5 interface, protection procedures for the switch-over of communication channel under failure are provided.


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PROTECTION protocolACTIVE C-CHANNEL TS16

LETS16

AN

STANDBY C-CHANNEL

The switch-over of protocol informationHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 29



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Dialing example

H

the PSTN user is the callerHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 31

Dialing example

H

the PSTN user is the callerHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 32

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Obe000000 v5 Interface Issue2.1

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