Operation; Incoming Calls - Nortel Enterprise 1000 Reference Manual

Page 220 of 236

Operation

Incoming calls

553-3023-211 Standard 1.00 June 2001
Analog line cards
Foreign and surge voltage protection
The OPS analog line card meets UL-1489 and CS03 overvoltage (power
cross) specifications and FCC Part 68 requirements for hazardous and surge
voltage limits.
Software service changes
Individual line interface units on the OPS analog line card are configured to
either OPS (for OPS application) or On-premises Station (ONS) (for ONS
application) Class of Service (CLS) in the Single-line Telephone
Administration program LD 10.
LD 10 is also used to select unit terminating impedance and balance network
impedance at the TIMP and BIMP prompts, respectively. See the Succession
Communication Server for Enterprise 1000 Input/Output Guide
(553-3023-311) for LD 10 service change instructions.
Port-to-port loss configuration
The loss plan for the OPS analog line card determines port-to-port loss for
connections between an OPS analog line card unit (port) and other PE or IPE
ports.
The transmission properties of each line unit are characterized by the OPS or
ONS class-of-service assigned in the analog 500/2500-type telephone
administration program LD 10.
The applications, features, and signaling arrangements for each unit on the
OPS analog line card are assigned through the Single-line Telephone
Administration program LD 10 and/or jumper strap settings on the card.
The operation of each unit is configured in software and is implemented in
the card through software download messages. When the 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 to a telephone connected to the OPS analog line card originate
from stations that can be local (served by the Succession CSE 1000) or remote