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October 2003 Page 16–7
Chapter 16. Universal Checkback Module
16
2&4 When both LEDs are lit, this indicates
that the module’s DIP switch is set to
Factory #6||
MAJOR ALRM–When lit, this red LED
indicates that the module has failed the
high power (10W) checkback test.
MINOR ALARM–When lit, this red LED
indicates that the module has failed the
low power (1W) checkback test.
RECOVERY–When lit, this red LED
indicates that the module is in carrier
recovery mode (after a failed checkback
test).
||REMOTE LOGON–When lit, this red LED
indicates a user is remotely logged on to
the checkback. The LED will remain on
until the remote user issues the remote
log off command or the checkback times
out (15 min.).||
CHECK OK–When lit, this green LED
indicates that the most recent checkback
test (since the module was activated)
was successful. When not lit, it indicates
either that the most recent checkback
test was not successful or that no
checkback test has occurred since the
module was activated.
16.1.5 Rear Panel Connections
The module's rear panel terminal block connec-
tions are shown in Figure 3-4 and Figure 3-5. As
described below, the module has both input and
output connections.
16.1.5.1 Inputs
TB7-5(+) & TB6-2(–)
EXT. ALARM RESET–Momentarily
closing the switch connected here clears
any (major or minor) alarms. Closing
the switch connected here for more than
two seconds clears the module from
carrier recovery mode.
TB6-1(+) & TB6-2(–)
EXT. TEST INITIATE–Momentarily
closing the switch connected here
initiates a checkback test. Closing the
switch connected here for more than two
seconds initiates a loopback test. Note
that closing both of the connected
switches above at the same time toggles
the module's automatic test state setting.
For example, if auto tests are enabled,
they become disabled. They are re-
enabled after you close these two again.
Note that when you disable automatic
testing, all front panel LEDs, except the
one labeled "CHECK OK" and the one
representing the active settings option,
begin to flash. When you press the
switches again and re-enable automatic
testing, the LEDs stop flashing.
16.1.5.2 Outputs
Although all checkback module outputs are
actually solid state circuits, you can configure
each of the five outputs to be either a normally
open or a normally closed relay output. The
module's Energized State setting (see "Using Your
PC to Communicate with the Universal
Checkback Module" later in this chapter) shows
what an output does when its condition is true. For
example, if a module fails a high power checkback
test, it sets the major alarm. If you've programmed
the MAJOR ALARM output to close when
energized, this output closes immediately after the
module fails the checkback test. After the module
has passed a test, this output opens.
The MAJOR ALARM and MINOR ALARM
outputs described below are permanently set. You
can configure the remaining three with either:
Delayed Alarm–(Output set after a module
fails to recover from auto recovery before
the Carrier Recovery Window expires.)
Test In Progress–(Output set by the module
initiating a checkback test for the duration
of the test.)
Successful Test–(Output set after passing a
checkback test.)
Successful Carrier Recovery–(Output set for
one second after a successful recovery from
automatic recovery mode.)