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Voice Modules (VCMs & DPVs)
VCM Front Panel
Table 6-2
shows a typical front panel of all voice channel modules and explains the function of each
switch and indicator (shown: ADPCM Voice Channel Module). You can check the operation of
each unit by monitoring the front panel indicators. The colors of the LED indicators on the modules
front panels are consistent in function:
•
Red and yellow are used for alarms or "service-affecting" conditions. This includes test
modes that are interfering with normal user data.
•
Alarm conditions depend on the modules, but normally, red indicates a Major Alarm (a
number of problems), and yellow indicates a Minor Alarm (channel alarms).
•
The green LED indicators are used for all other conditions, including data activity and
E&M signaling leads.
Table 6-2
VCM Front Panel
Front Panel
In
Svce
Supvn
In
Supvn
Out
Alm
Test
ADPCM
VOICE
CHAN
Note
The front panel features are the same for all versions of the VCM.
036R340-000
Issue 16
Item
Description
In Service
Green LED indicates when the channel is entered in the currently
active TDM configuration. This indicates that the module is operating.
Supervision In Green LED indicates that a busy state is detected from the customer
equipment. For E&M, this is a busy condition on the M lead. For FXS,
this is an Off-Hook condition. For FXO, this is the detection of a ringing
signal.
Supervision
Green LED indicates that a busy state is being applied to the customer
Out
equipment. For E&M, this is a busy condition on the E lead. For FXS,
this is application of a ringing signal. For FXO, this is application of an
Off-Hook condition.
Alarm
Yellow LED indicates that one of the following conditions exist: remote
or local out-of-sync, power-on self-test failed, hardware configuration
mismatch, or download failure.
Test
Yellow LED indicates that one of the following diagnostic tests are being
performed: power-on self-test, full-feature self-test, or data path test.
The test LED is also turned on if a diagnostic forced command is issued
which differs from the configured values.
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
VCM Overview
6-7
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