Avaya 03-300430 User Manual

Hybrid Line is another term for the MFAT (Multi-Function Analog Telephone). The Hybrid Line 
set is also known as an SCS (Small Communications System).
The TN762B Hybrid Line circuit pack supports eight of these multifunction analog telephone 
sets. The Hybrid Line sets use three pairs of wires: an analog voice pair, a transmit/receive pair, 
and a power pair.
This section describes HYB-LINE (Hybrid Line) maintenance. HYB-LINE maintenance is closely 
related to, and sometimes interacts with, HYB-BD (Hybrid Line circuit pack) maintenance. This 
interaction should be kept in mind when troubleshooting Hybrid Line problems.
This section occasionally refers to a station’s service state. These service states are defined as 
follows:

Use status station to determine terminal service state. Status is reported as either out of 

service, in service, or disconnect. The latter is equivalent to the ready-for-service state.

HYB-LINE

MIN

test port location l

Hybrid Line

HYB-LINE

WRN

test port location l

Hybrid Line

Out-of-Service

The port, and thus the station, have been removed from service. A 

busyout of a port will cause it to be out of service.

Ready-for-Service

The port on the circuit pack has been put into service, but the voice 

terminal has not yet established signaling communications with the 

port.

In-Service

The voice terminal has established signaling communications with the 

port, and the system is ready to process calls to and from that station. 

A terminal in the ready-for-service state will progress to the in-service 

state if it is functioning normally, but it can also be forced into the 

in-service state if it goes off-hook.