Operation - Nortel Circuit Card Installation Manual

Page 168 of 906
Environmental specifications

Operation

553-3001-211 Standard 3.00
NT1R20 Off-Premise Station Analog Line card
Table 66
OPS analog line card – ringer limitations (Part 2 of 2)
OPS Loop Range
0 – 10 ohms
> 10 – 900 ohms
> 900 – 2300 ohms
Table 67 shows the environmental specifications of the OPS analog line
card.
Table 67
OPS analog line card – environmental specifications
Parameter
Operating temperature
Operating humidity
Storage temperature
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.
August 2005
Maximum Number of
Ringers (REN)
3
2
1
Specifications
0° to +60° C (+32 to +140° F),
ambient
5 to 95% RH (non-condensing)
–40° to +70° C (–40° to +158° F)