Demand test descriptions and error codes - Avaya Support

SYNC (Port Network Synchronization)
Synchronization is needed for a PN with a public-network digital interface. Each PN with a DS1
or trunk-side BRI interface must be synchronized with an external timing source to prevent slips
between that PN and the external circuit-switched network. Each PN needs to operate
independently. Each PN:
● Potentially needs its own external synchronization reference
● Is always locked to an external public-network interface or is running locally.
A typical S8700 IP-PNC configuration is shown in Figure 75: S8700 Server IP-PNC Sync
Operation.
Figure 75: S8700 Server IP-PNC Sync Operation
This figure also shows the far-right S8700 IP-PNC system’s PN without public-network digital
interface. A PN without public-network connectivity runs off of its local IPSI circuit pack’s
Tone-Clock circuit.
Clock Synchronization
Note: S8700-series
Primary
Secondary
Public Switched Network
Primary
Secondary
PN PN
PN
IP Network
Note:
Fiber-PNC: Stratum-3 clocking is not available for a PN where the
Tone-Clock function is supplied by either a:
● TN2312 IPSI circuit pack’s Tone-Clock circuit
● TN2182 Tone-Clock circuit pack
This section discusses synchronization with Stratum-3 and -4 clocking devices.
Issue 5 May 2009 895