Nortel Networks 1000 - Manual (Page 963)

Functional description 963
The DTI/PRI obtains its power from the backplane, and draws less than 2
amps on +5 V, 50 mA on +12 V, and 50 mA on -12 V.
The DTI/PRI obtains its power from the backplane, and draws less than 2
amps on +5 V, 50 mA on +12 V, and 50 mA on –12 V.
Foreign and surge voltage protection
Lightning protectors must be installed between an external T1 carrier
facility and the system. For public T1 facilities, this protection is provided
by the local operating company. In a private T1 facility environment (a
campus, for example), the NTAK92 protection assembly can be used.
The NTRB21 circuit card conforms to safety and performance standards
for foreign and surge voltage protection in an internal environment.
Lightning protectors must be installed between an external T1 carrier
facility and the Option 11C cabinet. For public T1 facilities, this protection
is provided by the local operating company. In a private T1 facility
environment (a campus, for example), the NTAK92 protection assembly
may be used.
The NTRB21 circuit card conforms to safety and performance standards
for foreign and surge voltage protection in an internal environment.
Lightning protectors must be installed between an external T-1 carrier
facility and the CS 1000 system. For public T-1 facilities, this protection
is provided by the local operating company. In a private T-1 facility
environment (a campus, for example), the NTAK92 protection assembly
can be used.
The NTRB21 circuit card conforms to safety and performance standards
for foreign and surge voltage protection in an internal environment.
Functional description
NTRB21 provides the following features and functions:
•
configurable parameters, including A-Law and µ-Law operation, digital
pads on a per channel basis, and Superframe or Extended Superframe
formats
• AMI or B8ZS line coding
• 1.5 Mb Digital Trunk Interface and 1.5 Mb Primary Rate Interface
•
1.5 Mb Clock recovery and distribution of reference clocks
•
DG2 or FDL yellow alarm methods
• card status and alarm indication with faceplate-mounted LED
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.