Nortel Networks 553-3001-211 manual Power requirements Voltage Idle Active Tolerance Current Max

NT8D09 Analog Message Waiting Line card Page 545 of 894

Power requirements

Table 175 provides the power requirements for the NT8D09 Analog Message Waiting Line card.

Table 175

Power requirements

Voltage		Idle	Active
(+/-)	Tolerance	current	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	320 mA
			(Note 1)
86.0 V ac	5.00 V ac	0 mA	10 mA	160 mA
			(Note 2)
–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.

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

Circuit Card Description and Installation