NT8D09 Analog Message Waiting Line card Page 545 of 894
Circuit Card Description and Installation
Power requirements

Table 175 provides the power requirements for the NT8D09 Analog Message

Waiting Line card.

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. When the card is used to

Table 175
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 mA
(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 (or DN
telephone). There may be as many as five ringers on each line.