Two-Port Loop Start Module - Mitel Inter-Tel 5000 Installation And Maintenance Manual

Two-Port Loop Start Module

Each two-port Loop Start Module (LSM-2) supports one or two analog loop start/CO trunks in
the United States, and each quad Loop Start Module (LSM-4) supports 1–4 of the same type
trunk. LSMs support the same number of local exchange trunks in Europe.
For optimal CO trunk transmission performance, each analog loop start trunk interface should
be "hybrid balanced" in DB programming. Hybrid balancing refers to selecting the balance
network that best matches the trunk's impedance. To determine an appropriate hybrid balance
setting for analog loop start trunk interfaces, refer to the Inter-Tel 5000 Features and
Programming Guide (part no. 580.8006).
LSM circuits incorporate a self-resetting fuse that should never need replacement. If the fuse
should open momentarily—perhaps as the result of a lightning strike—it should reset within a
few seconds.
NOTICE
LSMs contain no field-replaceable parts. If any insurmountable problem with an LSM should
occur in the field, return the entire module to Inter-Tel for testing and possible repair. Failure
to follow this policy will void the warranty on the module.
Two green LEDs show the status of the LSM-2. The LED labeled ONLINE indicates if any circuit
on the module is busy. The other LED, labeled REMOVE, lights up only when the system has
been powered down and the condition is safe to remove the module from the bay. Also, when
secured in the chassis bay, the metal front panel of the module connects to chassis ground to
suppress electromagnetic interference (EMI).
When the system is in the default configuration, all trunks are configured for DTMF signaling. If
necessary, some or all of the trunks can be reprogrammed for dial-pulse signaling through DB
Programming.
NOTE
CO circuits are assigned hardware address numbers according to the module's bay in the
chassis and the location of the circuit on the module. For example, when using the initial
configuration (see paragraph 3.91), CO circuit 02.02.01 is the second circuit on the LSM-2 or
LSM-4 installed in bay 2. Each trunk module circuit is assigned a six-digit circuit number
XX.YY.ZZ, where XX = the module bay location (01–03), YY = the circuit number on the module
(01 or 02), and ZZ = whether the circuit has more than one purpose (currently, 01 only).
When the system is in the default configuration, the first four buttons on each endpoint are
assigned as CALL buttons for incoming call indication/access. The ANSWER button may also
be used to access incoming calls. No individual trunk buttons or trunk group buttons are
assigned. Button assignments can be designated in DB Programming. For more information,
refer to the Inter-Tel 5000 Features and Programming Guide (part no. 580.8006).
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Inter-Tel 5000 Installation Manual – Issue 2.4, May 2008
Single line endpoints generate their own DTMF tones when dialing. If used on dial-
pulse trunks, both the DTMF tones generated by the endpoint and the dial-pulse
signals generated by the system are sent to the CO, which may result in a
problem if the CO recognizes both. To avoid this problem, single line sets should
be restricted to ARS-only when using dial-pulse trunks. Then, only the ARS-
generated dial-pulse signals will be sent to the CO.
Chapter 4: Specifications
Two-Port Loop Start Module
Page 4-29