Modem Data-Only Stations - Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
5 Data Communications
Assigning Extension Jacks
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:
When 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.
An ISDN terminal adapter that does not support 2B Data should not be
connected to an MLX port that has been programmed as a 2B Data port.

Modem Data-Only Stations

A modem data-only station consists of a data terminal connected to the control
unit using an internal or external modem. This station does not include a
telephone.
Assign a tip/ring extension jack on an 012 (T/R), 016 (T/R), or 008 OPT module;
or, in Release 7.0 and later systems, to a port programmed for tip/ring operation
on a 412 LS-ID-ETR or 016 ETR module. Either an on- or off-premises extension
can be connected to an 008 OPT module.
Planning Form Instructions
Record the extension jack assignments for modem data stations on Form 2a,
System Numbering: Extension Jacks:
1. In the Jack Type column, make sure there is a T next to the number for
each tip/ring extension jack.
2. In the Person, Location, or Function column, write
each modem data station by person, location, or function.
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and then identify
Issue 1
April 1999
5-21
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