# Access AV5 V5.2 protocol support

Access network (AN) applications can use a V5.2 protocol stack to connect to local exchange (LE) equipment. In addition, equipment can use the V5.2 protocol for the following access methods:

- Analog telephone access

- Other digital or analog access for semi-permanent connections without associated out-of-band signalling information

The V5.2 protocol can use up to sixteen 2048 kbps links. For analog access on the LE side, the application converts signaling from PSTN ports into a functional part of the V5.2 protocol for signalling to the AN side. For ISDN applications, a control protocol within the V5.2 protocol defines a method for exchanging individual functions and messages required for coordinating call control procedures on the local exchange.

The V5.2 protocol includes the following features for supporting increased traffic and dynamic link allocation:

- A bearer channel connection protocol that the local exchange can use to establish and tear down bearer connections (identified by the signaling information) on demand.

- A link control protocol for multi-link management that allows applications to control link identification, link blocking, and link failure conditions.

- A protection protocol (operated on two separate data links for security reasons) for managing communication channel switching in the event of link failures.

Aztek AV5 software is designed to meet the requirements of access network equipment and supports the V5.1, V5.2, 1st Edition, and 2nd Edition ETSI standards.