AudioCodes Mediant 8000 - 32 V5.2 Access Gateway

Version 6.6 293 October 2014
Installation & Operation Manual 32. V5.2 Access Gateway
32 V5.2 Access Gateway
32.1 Overview
V5.2 is a standardized protocol suite for the connection of Access Networks (AN) to
the Local Exchange (LE) usually implemented in a traditional PSTN Class-5 switch.
V5.2 Access Gateway application implements the LE side of the V5.2 protocol. It
aggregates legacy circuit-switched voice from the subscriber side, converts V5.2
protocol messages to H.248 IP protocol and then hands them off to a softswitch and
vice versa. The gateway and the softswitch may be used as a replacement for
traditional Class 5 PSTN switch.
The V5.2 Access Gateway application implemented on the Mediant 8000 has the
following capabilities:

Support for E1 trunks on TP-8410 Media Gateway boards only.

Supported by the Mediant 8000 redundancy mechanism (refer to Working with
Media Gateway boards -> Redundancy Model for details).

V5.2 Links: each TP-8410 board features 42 E1 trunks that may be configured as
V5.2 links or as E1 transparent trunks (without voice – e.g. for PSTN clock
synchronization).

V5.2 Interfaces: the E1 trunks, configured as V5.2 links, are divided into groups
or V5.2 interfaces of 2-16 E1s each. Up to 30 V5.2 interfaces are supported.

Signaling Channels: a V5.2 interface uses 2 timeslots for signaling (active and
standby) in separate V5.2 links called Primary and Secondary links (Protection
Group). In both signaling links, the timeslot 16 is dedicated to the V5.2 signaling.
Under normal circumstances, a V5.2 interface starts up with the signaling on the
Primary link.

Voice Channels: in all V5.2 links, timeslots 1 to 31 (except for timeslot 16 in
signaling links) are used as voice channels.

User Ports: each TP-8410 board supports up to 10,000 PSTN user ports
distributed across the V5.2 interfaces; the number of user ports per V5.2 interface
is determined by the following formula: 300 * "Number of Trunks" – e.g. if the
V5.2 interface has 16 trunks – up to 4800 user ports may be defined on it.