Nortel Networks NN43001-301 manual 260 2.0 Mb PRI implementation

2602.0 Mb PRI implementation

If the NTAK93 D-channel daughterboard is attached, the NTBK50 PRI card functions in the same manner as the NTAK79 PRI card. If the NTBK51 D-channel daughterboard is attached, software is downloaded to the card instead of residing in a D-channel circuit.

For information on the NTBK50 faceplate LEDs, refer to ISDN Primary Rate Interface Maintenance (NN43001-717).

NTAK20 Clock Controller (CC) daughterboard

The NTAK20 Clock Controller daughterboard is used with the NTBK50 2.0 Mb PRI card. The NTAK79 PRI card has an onboard clock controller.

Digital Trunking requires synchronized clocking so that a shift in one clock source results in an equivalent shift of the same size and direction in all parts of the network. On systems, synchronization is accomplished with the NTAK20 clock controller circuit card.

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, Nortel recommends that at least one digital trunk is placed in the Small System main cabinet.

The Clock Controller circuitry synchronizes the system to an external reference clock, and generates and distributes the clock to the system. The system can function either as a slave to an external clock or as a clocking master. The NTAK20AB version of the clock controller meets AT&T Stratum 3 and Bell Canada Node Category D specifications. The NTAK20BB version meets CCITT stratum 4 specifications.

Shelf slot assignment

On non-CISPR B system cabinets, the NTAK20 is placed in slots 1-9. On cabinets NTAK11Dx and NTAK11Fx, the active NTAK20 is placed in slots 1-3 (slots 4-10 cannot be used.) On IP Expansion cabinets, the NTAK20 is placed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion cabinets, respectively.

NTAK93 D-Channel Handler Interface (DCHI) daughterboard

The NTAK93 DCHI daughterboard interfaces with the system Central Processing Unit (CPU) and mounts on the NTBK50 PRI card for PRI (but not ISL) applications. The equivalent circuit resides onboard the NTAK79 2.0 Mb PRI card. The DTI/PRI digital trunk card is installed in the Media Gateway. Digital trunk cards are not supported in Media Gateway Expansions.

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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