Nortel Networks NN43001-301 manual NTAK79 2.0 Mb PRI circuit card, NTBK50 2.0 Mb PRI circuit card

Hardware description 259

essentially replaces the D-channel circuit on the NTAK79 PRI card. (The NTAK79 PRI card does not support the NTBK51 Downloadable D-channel handler daughterboard.)

A second difference between the NTAK79 and NTBK50 2.0 Mb PRI cards is that the NTAK79 has an onboard clock controller while the NTBK50 supports the NTAK20 clock controller daughterboard.

Note: If the NTAK93 D-channel daughterboard is attached to the NTBK50 PRI card instead of the NTBK51 Downloadable D-channel daughterboard, the NTBK50 PRI card functions in the same manner as the NTAK79 PRI card.

NTAK79 2.0 Mb PRI circuit card

The 2.0 Mb Primary Rate Interface card provides the physical interface for the digital E-1 carrier on the system. The card includes an onboard clock controller and onboard D-channel handler. It is installed in slots 1-9 in the main cabinet. On IP Expansion cabinets, it is installed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion cabinets, respectively.

For information on the NTAK79 faceplate LEDs, refer to ISDN Primary Rate Interface Maintenance (NN43001-717).

NTBK50 2.0 Mb PRI circuit card

The 2.0 Mb Primary Rate Interface card provides the physical interface for the digital E-1 carrier on the system. The card is installed in slots 1-9 in the main cabinet or Media Gateway. On IP Expansion cabinets, it is installed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion cabinets, respectively.

ATTENTION

IMPORTANT!

Each Media Gateway that has a digital trunk must have a clock controller set to an external reference clock.

Note: Clocking slips can occur between Media Gateway systems that are clocked from different COs, if the COs are not synchronized. The slips can degrade voice quality.

The NTBK50 supports the following clock controller and D-channel handler daughterboards:

•NTAK20 clock controller daughterboard

•NTAK93 D-channel handler daughterboard, or NTBK51 Downloadable D-channel daughterboard.

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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