Nortel Networks NN43001-301 - Manual (Page 65)

NT5D12 Dual-port DTI/PRI 65
CPU capacity
Using a NT512 DDP card instead of DTI/PRI cards does not increase
the load on the system CPU. The DDP replaces an ENET card and two
DTI/PRI cards, it emulates the ENET card and the overall CPU capacity is
not impacted by usage of DDP card instead of a DTI/PRI card.
Power requirements
Table 17 "DDP power requirements" (page 65) lists the power requirements
for the DDP card.
Table 17
DDP power requirements
Voltage Source Current
DDP (without
NTBK51AA)
DDP (with
NTBK51AA)
+5V Backplane 3A 3.8A
+12V Backplane 25mA 75mA
-12V Backplane 25mA 75mA
Total Power (Maximum) 15.6W 20.8W
Testability and diagnostics
The DDP card supports all current QPC720 testing and maintenance
functions through the following procedures:
• Self test upon power up or reset;
• Signaling test performed in the LD 30;
• Loopback tests, self tests, and continuity tests performed by LD 60 and
LD 45;
• The D-Channel (MSDL, DCHI, DDCH) maintenance is supported by
LD 96.
NT5D12 Cable requirements
This section lists the types of cable used and the lengths required for
internal and external NT5D12 DDP connections.
Note 1: No additional cabling is required for nB+D configurations.
Multiple DDPs and the D-channel are associated through software in
LD 17.
Note 2: A detailed discussion of each type of DDP cable listed below
follows.
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
.