Nortel Networks Circuit Card 311 - Manual (Page 555)

Electrical specifications 555
Table 222
Power requirements
Voltage
(+/-)
Tolerance
Idle
current Active
current
Max
+ 12.0 V dc 0.36 V dc 48 mA 0 mA 48 mA
+ 8.0 V dc 0.40 V dc 150 mA 8 mA 280 mA
–48.0 V dc 2.00 V dc 48 mA 40 mA 688 mA
–48.0 V dc 5.00 V dc 0 mA 10 mA
(Note 1) 320 mA
86.0 V ac 5.00 V ac 0 mA 10 m
(Note 2) 160 mA
–150.0 V dc 3.00 V dc 0 mA 2 mA 32 mA
Note 1: Each active ringing relay requires 10 mA of battery voltage.
Note 2: Reflects the current for ringing a single station set. There may be as
many as five ringers on each line.
Foreign and surge voltage protections
In-circuit protection against power line crosses or lightning is not provided
on the NT8D09 Analog Message Waiting line card.
In-circuit protection against power line crosses or lightning is not provided
on the analog message waiting line card. When the card is used to service
off-premise telephones, primary and secondary MDF protection must be
installed. Details on installing protection devices are given in
"Environmental
specifications" (page 323) . Off-premise telephones served by cable pairs
routed through the central office, or crossing a public right-of-way, can be
subject to a requirement for on-card protection, and MDF protectors may
not be acceptable. Check local regulations before providing such service.
In-circuit protection against power line crosses or lightning is not provided on
the Analog Message Waiting line card. When the Analog line card is used to
service off-premise telephones, the NTAK92 Off-premise protection module
must be used. Check local regulations before providing such service.
In-circuit protection against power line crosses or lightning is not provided
on the NT8D09 Analog Message Waiting Line Card. When the analog line
card is used to service off-premise telephones, the NTAK92 Off-Premise
protection module must be used. Check local regulations before providing
such service.
Overload level
Signal levels exceeding +7 dBm applied to the tip and ring cause distortion
in speech transmission.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.