Nortel Networks NN43001-301 Installation procedures, Small System Clock Controller daughterboard

168Clock Controller description and installation

Free run (non-tracking) mode

The clock synchronization for a PRI loop can operate in free-run mode if:

•the loop is not defined as the primary or secondary clock reference

•the primary and secondary references are disabled

•the primary and secondary references are in a local alarm state

Small System Clock Controller daughterboard

The Small System supports a single onboard clock controller daughterboard, the NTAK20, located on either:

•the NTRB21 1.5 Mbyte DTI/PRI card

•the NTAK09 1.5 DTI/PRI card

•the NTAK10 2 Mbyte DTI card

•the NTAK79 2 Mbyte PRI card

•the NTBK50 2 Mbyte PRI card

The clock controller circuitry synchronizes to an external reference clock and generates and distributes the clock to the system. This enables the system to function either as a slave to an external clock or as a clocking master.

Note: When configuring ISL over analog trunks, clock controllers are not required.

Installation procedures

This section provides procedures on how to install a clock controller on Large Systems.

CAUTION

Do not deviate from the procedures described in this section. Call processing can stop if procedural steps are not followed properly.

Determine slots and shelves

Table 64 "Clock Controller shelves and slots" (page 169) shows the systems, the shelves and available slots.

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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