Lucent Technologies MERLIN LEGEND Release 5.0 Feature Reference page 420

MERLIN LEGEND Communications System Release 5.0
Feature Reference 555-650-110
Features
Multi-Function Module
ONLY a qualified technician should install, repair, or set options for an
MFM.
Do not touch the circuitry on the MFM. Touching the circuitry may result in
component damage from electrostatic discharge.
Before installing the MFM, disconnect all line/trunk and/or power cords
attached to the MLX telephone. This is to ensure that no hazardous
voltages are present during assembly. Ringing voltage from the MFM
attached to the MLX telephone can cause electrical shock if adjustments
are made while the cords are connected.
Description
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 communications channels assigned to the telephone;
therefore, calls can be made to and from the device independently of the
telephone. The communications 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 can. But the call to the MFM
extension number cannot be answered until one of the communications channels
is free (the MLX telephone user hangs up or the person calling the MLX telephone
user hangs up).
Although each MLX extension 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 jack whether or not an MFM is connected.
Because a separate extension number is assigned, features and line/trunk access
can be assigned to the MFM independently of the MLX telephone. See
Renumbering'' on page 583
The ringing patterns for devices connected to an MFM are similar to those of an
MLX telephone for inside calls: two rings for outside calls; a ring and two beeps 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)
2 8
for details on specific extension numbers assigned.
Issue 1
June 1997
Page 388
''System