Functional description 1063
The DTI/PRI obtains its power from the backplane, and drawsless 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 drawsless 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 NTAK92protection 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 NTAK92protection 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 protectionis provided
by the local operating company. In a private T-1 facility environment (a
campus, for example), the NTAK92protection 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 featuresand functions:
•configurable parameters, including A-Lawand 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 TrunkInterface and 1.5 Mb Primar y 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
•automatic alarm monitoring and handling
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
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