Multi-Function Module - AT&T MERLIN LEGEND System Reference Manual

Features

Multi-Function Module

Description
See "System Numbering" in this chapter
for details on specific extension
numbers assigned.
Tip/Ring Interface
The Multi-Function Module (MFM) is an optional adapter installed inside an MLX
telephone and used for connecting tip/ring or external alert devices. The MFM
operates on one of the two B channels assigned to the telephone; therefore,
calls can be made to and from the device independently of the telephone.
The B channel is also used for the Voice Announce to Busy feature. Because of
this, when a call is active at both the MLX telephone and the MFM device, the
Voice Announce to Busy feature cannot be used to reach the MLX telephone
user. Conversely, if the Voice Announce to Busy feature is being used to reach
the MLX telephone user, calls cannot be made from the device connected to the
MFM. In addition, if the Voice Announce to Busy feature is being used at the
same time that a call is received at the MFM extension number, the caller hears
ringing and the device rings if it is capable. But the call to the MFM extension
number cannot be answered until one of the B channels is freed (the MLX
telephone user hangs up or the person calling the MLX telephone user hangs
up).
Although each digital station jack used to connect an MLX telephone is
assigned only one logical ID, the system automatically assigns two extension
numbers-one for the MLX telephone and one for the device connected to the
MFM. Both extension numbers are assigned to the digital jack whether or not an
MFM is connected. Since a separate extension number is assigned, features
and line/trunk access can be assigned to the MFM independently of the MLX
telephone.
The ringing patterns for devices connected to an MFM are similar to those of an
MLX telephone rather than a single-line telephone-one ring for inside calls, two
rings for outside calls, and three rings for priority ring or transfer return.
A switch on the MFM can be set for one of the following operations:
Tip/ring interface
Supplemental Alert Adapter (SAA)
When the MFM is set for tip/ring interface operation, the following types of dual-
tone, multi-frequency (DTMF) tip/ring
receive inside and outside calls:
Single-line telephones
Modems
Fax machines
Transaction telephones
Cordless single-line telephones
Answering machines
Speakerphones that emulate a tip/ring device
devices can be used to make and/or
Multi-Function Module 2-233