Nortel Networks NN43001-301 manual Modes of operation, Example 7, Network Clocking with MUX

Description 167

Figure 66

Example 7, Network Clocking with MUX

In this example, the direct connection to the CO (without a MUX) should be used as a primary clock reference because this is where the least amount of hardware is involved. The MUX must pass the clock and not generate its own clock; in other words, it must be a slave (not Free Run). Synchronized clocking is required.

Modes of operation

There are two modes of operation, tracking mode and free run (non-tracking) mode.

Tracking mode

In tracking mode, the Primary Rate Interface (PRI) or Digital Trunk Interface (DTI) loop supplies an external clock reference to the onboard clock controller. Two PRI or DTI packs can operate in tracking mode, with one defined as the primary reference source for clock synchronization, the other defined as a secondary reference source. The secondary reference acts as a back-up to the primary reference.

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

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