Environmental Specifications; Operation; Incoming Calls - Avaya Nortel Communication Server 1000 Reference

Table 56: OPS analog line card - ringer limitations
0–10 ohms
> 10–460 ohms
0 – 10 ohms
> 10 – 900 ohms
> 900 – 2300 ohms

Environmental specifications

Table 57: OPS analog line card - environmental specifications
environmental specifications of the OPS analog line card.
Table 57: OPS analog line card - environmental specifications
Operating temperature
Operating humidity
Storage temperature

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.

Incoming calls

Incoming calls to a telephone connected to the NT1R20 OPS analog line card originate from
stations that can be local (served by the PBX) or remote (served through the public switched
telephone network). The alerting signal to telephones is 20 Hz (nominal) ringing. When an
incoming call is answered, ringing is tripped as the telephone goes off-hook, placing a low-
Circuit Card Reference
ONS Loop Range
Parameter
Maximum Number of Ringers
3
2
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)
Operation
(REN)
on page 127 shows the
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