Nortel Networks NN43001-301 - Manual (Page 64)

64 ISDN Primary Rate Interface equipment overview
Port 1 Clk Connectors
Two RJ11 connectors for connecting:
• Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 0.
• Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 1.
Connector J5 (TRK)
A 9 pin D-Type connector used to connect:
• Digital trunk port 0 receive and transmit Tip / Ring pairs.
• Digital trunk port 1 receive and transmit Tip / Ring pairs.
Connector J6 (DCH)
A 26 pin D-type connector, used to connect the DDP card to MSDL or
QPC757 external D-channel handlers.
System capacity and performance
Physical capacity
Each DDP card occupies one slot on the network shelf. It supports two
digital trunk circuits and two network loops. The total number of DDP cards
per system is limited by the number of network loops, physical capacity of
the shelf, number of DTI/PRI interfaces allowed by the software and the
range of DCH addresses.
D-Channel capacity
The software configuration for the NTBK51AA DDCH is similar to the MSDL.
It is both physical and logical, and supports D-Channel functionality only.
The system has a total capacity of 16 addresses (Device Addresses or
DNUM) that can be reserved for DCHI card, MSDL card or DDCH card. One
exception is DNUM 0 which is commonly assigned to the System Monitor.
No two different D-Channel providers can share the same DNUM. Hence,
the combined maximum number of DCHI, MSDL and DDCH cards in the
system is 16.
The DCHI and DDCH have two D-Channel units, the MSDL has four.
Therefore the total number of D-Channels is derived by the following formula:
Total_Num_DCH-Units = Num_DCHIx2 + Num_DDCHx2 + Num_MSDLx4
Therefore, Total_Num_DCH-Units in any given system is between 0-63.
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
.