Page376 of 544 NT8D09Analog Message Waiting Line Card
553-3011-100 Standard14.00 January 2002
Power requirements
Table provides the power requirements for the analog message waiting line
card.
Foreign and surge voltage protections
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.
Overload level
Signal levels exceeding +7 dBm applied to the tip and ring cause distortion in
speech transmission.
Table 1 12
Power requirements
Volta ge
(+/-) Toler ance Id le
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 A
(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.