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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-22Assigning Extension Jacks
5
Guidelines for Digital Extension Jacks 5
Although only one logical ID is assigned to each digital extension jack, the system
automatically assigns two extension numbers:
■ The first extension number shown on Form 2a is assigned to an MLX
telephone connected to the extension jack.
■ The second extension number assigned to each jack is reserved for an
adjunct, such as an ISDN terminal adapter data terminal or desktop video
endpoint, connected to the MLX telephone.
■ If a personal or group video system is connected to the MLX port,
extension numbers are assigned to the video system for use in 2B Data
connections.
Both extension numbers are assigned automatically, whether or not the extension
includes an ISDN terminal adapter. Calls can be placed to both extension
numbers independently. Note that an MLX extension cannot have both an ISDN
terminal adapter and an MFM.
Also, when configuring digital data equipment connections to an MLX port, the
following requirements and/or restrictions must be applied:
■ If using a 7500B data module as an ISDN terminal adapter, and it is the
only ISDN terminal adapter data station on the MLX port (no MLX
telephone is connected), a 440A4 terminating resistor adapter must be
configured to provide 100-ohm termination for each transmission pair. The
7500B data module does not provide termination.
■ An MLX telephone is independent from the ISDN terminal adapter;
however, the telephone may cause channel conflict between the telephone
and the ISDN terminal adapter when the telephone is voice-signaled while
active on a call. If a slight chance of data call blocking is unacceptable, an
MLX telephone should not be connected to an ISDN terminal adapter used
in a data station configuration.
■ The maximum cord length from an MLX telephone to an ISDN terminal
adapter is 80 feet (24 meters). This should be considered if you plan to use
the voice capability of a port by connecting an MLX telephone far from the
ISDN terminal adapter.
■ Do not connect an ISDN terminal adapter that does not support 2B Data to
an MLX port that has been programmed as a 2B Data port.
■ When using the 008 MLX or 408 GS/LS-MLX module for data or video, you
must use Version 28 of the module.