Instruction manual

Page 1937 of 3156
Features and Services
Loopback on Public Exchange/
Central Office Trunks
Contents
Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1937
Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1937
Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1937
Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1938
Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1938
Feature operation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1938
Feature description
When a Loop Start signaling arrangement Public Exchange/Central Office
(CO) trunk unit is disabled a loopback is performed – the unit is hardware
seized to prevent the far end switch from making an incoming call; the CO
trunk appears to be in an off-hook state. This enhancement prevents loopback
from being performed in this scenario.
Operating parameters
This enhancement applies to the Central Office trunk card used in France,
which is the NTD9742A.
Feature interactions
This enhancement does not apply to CO trunk cards located on Meridian 1
Intelligent Peripheral Equipment shelves (loopback prevention is handled by
the trunk card in this configuration).