Aastra Ascotel IntelliGate 2065 - 6.1.7 Synchronization; 6.1.7.1 Clock propagation diagram

Ascotel IntelliGate 2025/2045/2065
Part 3 Planning a private network 669
[1] Basic access used to increase connection reliability
Fig. 3.59: Connection reliability in the public network
6.1.7 Synchronization
A PBX’s clock frequency is predefined (synchronized) by the public network via
basic accesses T and primary rate accesses T2.
If the synchronization provided by the public network fails (due, for instance, to
interrupted trunk lines), the PBX will use its own clock frequency.
In the private leased-line network, systems synchronized by the public network
pass on the clock reference to systems that are not directly connected to the pub-
lic network.
6.1.7.1 Clock propagation diagram
Synchronization in a private leased-line network has to be carefully planned to
ensure that synchronization loops never occur. A synchronization loop occurs
whenever two systems synchronize each other.
PINX 1 PINX 3
PINX 2
haz0808aaxxb0
[1]