The Layer 3 Protocols
- Control protocol - This controls the setup and basic management of the V5 link from the Access Network (AN) to the Local Exchange (LE).
- PSTN protocol - Translation of the analogue signals for POTS into a digital form for transfer from AN to LE. (i.e. off-hook, digit dialling, on hook etc.).
- BCC protocol - In V5.2 since any channel could be allocated to the call, this protocol is assigned the job of managing the assignment of channels to a call. (Only in v5.2)
- Link control protocol - For managing up to 16 E1 links. It controls the status of the links (i.e. in service/out of service).
- Protection protocol - Used in V5.2; this protocol is duplicated on two or more channels on two or more links and provides instant failover in the event of one failing.
V5.1 only supports the Control, PSTN and ISDN protocols. V5.2 also supports BCC, Link Control and Protection protocols.
V5 layer 3 protocols are transported on a layer 2 protocol called LAPV5, a variation of the LAP-D or Link Access Procedures, D channel ISDN transport layer.
V5 is a protocol stack which controls circuit-switched communication paths.
Read more about this topic: V5 Interface
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