Specifications

AMT/PTD/PBX/0058/4/6/EN Installation and Maintenance Manual - Aastra 5000
Page 102 01/2011 Description et caractéristiques d’un PBX
3.8.4.3 Propagation of the synchronisations inside a multisite network
(Plate 9.4)
The UCV/UCV-D card includes 2 synchronisation ports used to propagate
synchronisation inside a multi-site network.
The two master iPBXs are interconnected through their primary ports; their secondary
ports are each connected to the primary port of a slave iPBX, whose secondary port is
itself connected to the primary port of another slave iPBX…
Synchronisation is then distributed from peer to peer within the multisite network.
Nota : In case of failure or loss of synchronisation on the public network of the priority
master iPBX, the non priority master iPBX provides synchronisation.
The secondary port of the iPBX provides a copy of the synchronisation signals of the
primary port. Synchronisation continuity is maintained when an iPBX fails or is powered
off.
If any of the 2 bit or DECT clocks is lost, the iPBX time base changes to local mode then
sends its own clock signals to its DECT base stations and secondary port.
In a multisite system, the bit clock of the master system is transmitted together with the
DECT synchro signal, and is the top priority clock for slave cabinets.
3.8.5 Defence chain
3.8.5.1 Overview
The defence chain is provided by the various subassemblies fitted in the iPBX. Its role is
to advise the operator of malfunctions of one or more items.
It includes the following functions:
• Monitoring
• Alarm analysis
• Self-protection.