Hardware description 199

Shelf slot assignments

For cabinet systems, the NTAK09 DTI/PRI card can be placed in main and expansion cabinets in any single card slot given in Table 74 "Shelf slot assignments for NTRB21, NTAK09, and NTAK20" (page 202).

Digital trunk cards are not supported in the Media Gateway Expansion.

Figure 77

NTAK09 DTI/PRI circuit card

NTAK20 Clock Controller (CC) daughterboard

Digital Trunking requires synchronized clocking so a shift in one clock source results in an equivalent shift of the same size and direction in all parts of the network. Synchronization is accomplished with the NTAK20 clock controller circuit card in each Main and IP expansion cabinet/Media Gateway.

ATTENTION

IMPORTANT!

Every Small System cabinet or Media Gateway that contains a digital trunk must contain a clock controller.

If a Small System is equipped with digital trunks, it is recommended that at least one digital trunk be placed in the main cabinet.

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

Copyright © 2003-2007, Nortel Networks

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Nortel Networks NN43001-301 manual NTAK20 Clock Controller CC daughterboard, NTAK09 DTI/PRI circuit card