Jacks For Mlx Telephones - AT&T MERLIN LEGEND Release 3.1 System Planning Manual

Numbering the System

Jacks for MLX Telephones

Use these instructions only if the system has non-operator MLX telephones or
digital data/video stations (such as a videoconferencing station) to assign to
digital extension jacks on 008 MLX and 408 GS/LS-MLX modules. Otherwise,
skip to the next section, "Jacks for Analog Multiline Telephones." To plan
connections for digital data equipment, see Chapter 5, "Data Communications."
NOTE:
When using the 008 MLX or 408 GS/LS-MLX module for data or video, you must
use Version 28 of the module.
The system assigns two extensions, although only one logical ID is assigned to
each digital extension jack. For MLX telephones, one extension number is
automatically assigned to the MLX telephone physically connected to the digital
extension jack. The second extension number is reserved for an adjunct, such
as a modem, that can be connected to the MLX telephone through a Multi-
Function Module (MFM), or for an ISDN terminal adapter (such as the
ExpressRoute 1000 or the ISDN 7500B Data Module) used to connect a data
terminal. For information about renumbering jacks, see "System Renumbering,"
later in this chapter.
The system automatically assigns both extension numbers whether or not the
extension includes an MFM or ISDN terminal adapter. Calls can be placed to
both extension numbers independently.
The MFM can operate as an interface for either a Supplemental Alert Adapter or
a tip/ring device. The Supplemental Alert Adapter (SAA) setting on the MFM is
used when the MFM connects an external alert such as a bell or horn. The
tip/ring (T/R) setting is used when the MFM connects a tip/ring device such as
an answering machine or modem.
NOTE:
The system capacity for extensions is decreased by two whenever an MLX-20L
telephone is used.
In Behind Switch mode, the system automatically assigns two prime lines to
each port on an MLX module—one for the MLX telephone and one for the
device connected to the MFM. If an MFM is not connected to an MLX telephone
or the MLX port is not used, the prime line for the MFM can be removed. The
prime line can then be assigned to another user.
When PRI, NI-1 BRI, or T1 Switched 56 lines/trunks are assigned to an MLX
jack, digital data/video stations may use two B-channels simultaneously (2B
Data) to place or receive high-speed data/video calls. Optionally, some video
stations may be set up in a Passive Bus configuration. In this configuration, one
MLX jack serves both the video system and a standard MLX telephone that is
connected to the video system rather than directly to the MERLIN LEGEND. For
more information on planning for video applications, see Chapter 5, "Data
Communications."
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Control Unit Configuration