Nortel Networks 311 System capacity and performance Physical capacity, D-Channel capacity, CPU capacity

Physical description 331
System capacity and performance
Physical capacity
Each NT5D97 DDP2 card occupies one slot on the network shelf. Each card
supports two digital trunk circuits and two network loops. The total number
of DDP2 cards per system is limited by the number of network loops,
physical capacity of the shelf, number of DTI2/PRI2 interfaces allowed by
the software and the range of DCH addresses.
D-Channel capacity
The software configuration forthe NTBK51AA DDCH is similar to the MSDL
and only supports D-channel functionality.
The system has a total capacity of 16 addresses (Device Addresses or
DNUM) that can be reserved for DCH card, MSDL card or DDCH card. One
exception is DNUM 0 which is commonlyassigned to the TTY terminal.
No two different D-Channel providers can share the same DNUM. Hence,
the combined maximum number of DCH, MSDL and DDCH cards in the
system is 16.
The DCH has one D-Channel unit, the DDCH has two D-Channel units,
and the MSDL has a maximum of four units. Therefore, the total number
of D-Channel is derived by the followingformula:
Total_Num_DCH-Units= Num_DCHx1 + Num_DDCHx2 +
Num_MSDLx4
Therefore, Total_Num_DCH-Unitsin any given system is between 0-63.
CPU capacity
Using a NT5D97 DDP2 card instead of DTI2/PRI2 cards does notincrease
the load on the CPU. The DDP2 replaces an ENET card and two DTI2/PRI2
cards. Emulating the ENET card and the overall CPU capacity is not
impacted by using a DDP2 card instead of a DTI2/PRI2 card.
Power requirements
Table138 "NT5D97 DDP2 power requirements" (page 331) lists the power
requirements for the NT5D97 DDP2 card.
Table138
NT5D97 DDP2 power requirements
Voltage Source Current
DDP2
(without
NTBK51AA)
DDP2
(with
NTBK51AA)
+5V Backplane 3A 3.8A
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.