Digital Channel Bank Low Speed Signaling Channel Units Generic Requirements
Document Number TR-TSY-000177
Issue Number 01
Issue Date Jun 1987
Replaces TA-TSY-000177 Issue01
ABSTRACT: The Low-Speed Signaling Channel Unit (LSS CU) is a transmitting or receiving channel unit. Every 125 us, the unit accepts an input
from, or delivers an output to, one of the several low-speed circuits (subchannels) connected to it. The maximum signaling speed is 30
baud. Each channel unit type allows several low-speed signaling circuits to share a channel time slot of a digital transmission
This Technical Reference (TR) presents the view of Telcordia on generic requirements for three types of LSS CUs:
This document identifies requirements and objectives that should be provided in order to meet the typical needs of a Local Exchange
Carrier (LEC) or other service provider. The parameters and features identified are intended to assist network integrity, reliability,
- Open and close the loop (direct wire alarm circuit)
- Open, close, and ground the loop (McCulloh alarm systems)
- Switch the polarity of the battery that terminates the loop (polarity reversal alarm system).
TR-TSY-000177 replaces TA-TSY-000177.