Nortel Networks NN43001-301 - Manual (Page 25)

NT8D72 PRI2 25
NTBK51 Downloadable D-Channel Daughterboard
The NTBK51 is a two port Downloadable D-Channel Daughterboard (DDCH)
that has been introduced as an option to the NT6D80 MSDL, the NT5D97
dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb DTI/PRI card.
The NTBK51 supports all the features of the existing 4 port MSDL
(NT6D80), and eliminates the need for an external DCH card and associated
cables for MSDL applications. The NTBK51 can support a maximum of 32
(16*2) MSDL type D-Channels per system, unlike the MSDL which can
support a maximum of 64.
Note 1: Only one version, the NTBK51AA, can be used with the
NT5D97, or the NT5D12. The NTBK51BA version has only 30+30 pin
connectors (instead of 40+30 pins in the AA version). The missing 10
pins in the BA version prohibits the use of port 0 on the NT5D97, or
NT5D12 card.
Note 2: The software allocation for NTBK51AA DDCH is similar to
the MSDL. It is both physical and logical, and supports D-Channel
functionality only.
Note 3: Port 0 has to be an even loop on the DDP2, and Port 1 has to
be an odd loop. Port 2 and Port 3 should not be configured.
The connection between the dual-port cards and the DDCH daughterboard
is made using two headers: one 30 pin and one 40 pin connector.
Standard PRI cards
This section provides a description of the standard ISDN PRI cards, namely
the NT8D72 (AB/BA) PRI2 card, and the QPC720 1.5 Mb PRI card.
NT8D72 PRI2
Power requirements
The NT8D72AB and NT8D72BA PRI use power and ground connections
from the backplane. Power requirements are:
+5 volts at 4 amperes
+12 volts at 50 milliamperes
-12 volts at 50 milliamperes
NT8D72 faceplate
The NT8D72 contains five LEDs and six external connectors. Figure 5
"NT8D72 PRI faceplate layout" (page 26) shows the faceplate layout.
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
.