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Alarm Cut-Off (ACO)
The VLBRV has the capability to generate alarms indicating failures related to the VLBRV
Channel Module's operation. Alarms are indicated through front panel indicators, messages dis-
played in the system alarm scan, or by the VLBRV Channel alarm scan. When alarm cut-off
(ACO) is selected, the VLBRV Channel Module cannot report alarm conditions to the system.
ACO is useful when an alarm condition has been noted, but the VLBRV Channel Module con-
tinues to generate alarm messages. When ACO is implemented, it prevents further messages from
entering the Alarm Scan displays and filling message buffers. This ensures that the alarm scan
reports only new alarms, and reflect only new problems that occur in the network. When the VL-
BRV Channel Module is set for ACO, the Alarm indicator on its front panel remains lit to indicate
this condition.
ACO may be selected for all VLBRV Channel Module's in a configuration. This action prevents
the reporting of channel alarms by the alarm scan. The alarm scan list contains only major alarms
(those that indicate a system-level problem). When ACO is set On for all channels, it cannot be
turned Off again (except in version 3.20 and later) for all channels simultaneously; it may only
be turned Off on a channel by channel basis, or when a change is made to the configuration.
Interface Type (I/F Type )
The VLBRV Channel Module voice interface type arrangement supports E and M signaling. M
is an input control signal (input to the voice channel) and E is an output control signal. The signal
state of an M-lead at one channel interface is multiplexed through the system and transmitted at
the opposite end interface as an E-lead output. The interface type is identified as I/F type VC-1
(shown below).
SEND : M
RCV
: E
Switches and jumpers on the VLBRV Channel Module selects one of the five E and M signaling
types. Each type is a different representation of the E and M On and Off states using voltage levels
or open and closed circuits. Since any of these types result in On or Off states for the signals, they
are not differentiated by the supervisory port display. You may display and change the states of
the E and M signals using Control State routines provided as part of the Diagnostics routines. This
feature allows you to disable the VLBRV Channel Module when required. However, if you save
changes made to the voice channel controls, the control states are changed in the channel config-
uration also. Be sure to note such changes if you make them. A disabled VLBRV Channel Module
remains disabled until action is taken through Configuration or Diagnostics routines to restore
them.
I/F CONTROL [NAMES]
MODE M
NODE S
M
E
3
036R660-E1
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