Nortel Networks 553-3001-211 manual Operation, Environmental specifications

Page 166 of 894 NT1R20 Off-Premise Station Analog Line card

Table 65

OPS analog line card – ringer limitations (Part 2 of 2)

	Maximum Number of
OPS Loop Range	Ringers (REN)
0 – 10 ohms	3
> 10 – 900 ohms	2
> 900 – 2300 ohms	1

Environmental specifications

Table 66 shows the environmental specifications of the OPS analog line card.

Table 66

OPS analog line card – environmental specifications

Parameter	Specifications
Operating temperature	0° to +60° C (+32 to +140° F),
	ambient
Operating humidity	5 to 95% RH (non-condensing)
Storage temperature	–40° to +70° C (–40° to +158° F)

Operation

The applications, features, and signaling arrangements for each unit on the NT1R20 OPS analog line card are assigned through LD 10 and/or jumper strap settings on the card.

The operation of each unit is configured in software and implemented in the card through software download messages. When the NT1R20 OPS analog line card unit is idle, it provides a ground on the tip lead and –48 V dc on the ring lead. The on-hook telephone presents a high impedance toward the line interface unit on the card.

553-3001-211 Standard 2.00 September 2004