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6
ACO ON/OFF
Alarm Cutoff selects whether alarms in the VLBRV Channel Module are reported and logged in
the alarm scan, or indicated by the Common Alarm Plus Module front panel indicators. This feature
is useful when a malfunctioning channel produces enough alarms to prevent alarm reporting on oth-
er channels. Use the up and down cursor keys to choose the ON (alarms cut off) or OFF (alarms
reported) selection. This entry becomes valid when the cursor is placed at another channel param-
eter.
CONFIGURATION
The name of the configuration that the channel is being installed in is located in the upper right-
hand corner of the screen. The configuration name may contain up to ten alphanumeric characters,
and may be changed as part of the modification of any channel. Any characters available on the key-
board may be entered, however, the first character entered must be an alphabetic character. To enter
a configuration name, with the cursor positioned at the presently displayed configuration, type the
desired name. The new name becomes valid when the cursor is moved to another parameter.
VLBRV CHANNEL MODULE TESTS
The VLBRV Channel Module tests exercises the VF (analog) and digital components. The VF in-
terface of the voice channel is the channel interface with telephone equipment.
The VF signal from the channel interface is digitized into data that can be multiplexed with other
VLBRV Channel Module data. A loopback or data origin on the analog side of the channel refers
to the channel telephone equipment interface. A loopback or data origin on the digital side refers to
the digital interface with MEGAMUX PLUS common set components.
Rcv dB Level - The output level of the VLBRV Channel Module can be adjusted within a range of
+1.5 dB to -6.0 dB, with 0.5 dB between each step. The levels are set separately for the VLBRV
Channel Module at each node. This adjustment is the same as the VF-dB-LEVELS channel param-
eter, and becomes the output level adjustment. You can save the Rcv dB level as part of this routine.
When changing voice output levels through the Rcv dB levels routine, it is preferable to save the
selected levels in configuration memory. Otherwise, a discrepancy exists between stored channel
parameters, and actual channel operation. If a different configuration is activated, and the levels set
in the new configuration are the same as the stored parameters for the previously active configura-
tion, the voice levels set by the Rcv dB levels routine remain (the channel's voice output level does
not change to the levels set in the newly activated configuration).
VF Idle
The VF Idle Test evaluates the noise level in the system. The analog input of the VLBRV Channel
at the data origin node is grounded. The loopback may be local, with the loopback point at the same
node as the data origin, or may be remote, with the loopback point at the opposite node from the
data origin VLBRV Channel. The VLBRV Channel at the data origin evaluates the noise level in
the loopback path, and develops an error count (in this test, errors are significant deviations from
ground in the returned VF signal). Figure 3 shows the loopback paths of a VF Idle test with Node
M as the data origin point.
036R660-E1
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