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The V5.2 protocol stack is used for the connection of an AN to an LE. It enables for various access methods, like analog telephone access and ISDN basic rate access. A V5.2 interface may use up to 16 E1 interface links. For analog access, the PSTN user port is converted into a functional part of the V5.2 protocol for signaling to the AN side. In principle, the V5.2 interface uses a concentrator type, whereby up to 16 E1 links, each carrying 30 channels (480 channels in all), may serve up to 1,920 subscribers with concentration. There is no limit in principle, to the number of V5.2 interfaces that can exist between the access network and the local exchange. A channel is allocated to a subscriber dynamically when he or she makes or receives a call.

V5.2 includes a protection protocol, allowing for redundancy in the signaling. Usually, the signaling for the 16 E1s is carried on one channel on one link (the primary link). If the signaling link fails, a secondary link is set to take over. This is similar in principle to SS7 `s multiple point codes. In order to support more traffic through dynamic allocation of channels, the V5.2 protocol has several additions:

  • A bearer channel connection (BCC) protocol establishes and de-establishes bearer connections required on demand, identified by the signaling information, under the control of the Local Exchange.
  • A link control protocol is defined for the multi-link management to control link identification, link blocking, and link failure conditions.
  • A protection protocol, operated on two separate data links for security reasons, is defined to manage the protection switching of communication channels in case of link failures.

V5.2 protocol implementation in Telesis systems follows ETSI Standard EN 300 347 (Version 2). The implemented protocol covers both LE (Local Exchange) and AN (Access Network) protocols and supports analog telephone access (PSTN) and ISDN basic-rate access.

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Page last modified on May 27, 2010, at 02:27 AM EST
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