Nortel Meridian 1 Option 11C, Administration And Maintenance

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Appendix A — 2Mb PRI implementation Page 435 of 492
Option 11C ISDN BRI Administration and Maintenance
Hardware description
2.0 Mb PRI cards
Two PRI cards are available on the Option 11 system:
— NTAK79 2.0 Mb PRI card
— NTBK51 2.0 Mb PRI card
The difference between the two PRI cards is the ability of the NTBK50, when
equipped with the NTBK51 D-channel daughterboard, to download software
onto the card. This feature is based on the MSDL platform and 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 on-board 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 Mb PRI circuit card
The 2 Mb Primary Rate Interface card provides the physical interface for the
digital E-1 carrier on the Option 11 system. The card includes an on-board
clock controller and on-board D-channel handler. It is installed in slots 1
through 9 in the main cabinet.
NTBK50 2 Mb PRI circuit card
The 2 Mb Primary Rate Interface card provides the physical interface for the
digital E-1 carrier on the Option 11 system. The card is installed in slots 1
through 9 in the main cabinet and supports clock controller and D-channel
handler daughterboards:
— NTAK20 clock controller daughterboard
— NTAK93 D-channel handler daughterboard, or NTBK51 Downloadable
D-channel daughterboard.