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Functional Description
CP525 cMux User’s Manual Rev. 5.20.12 (3944)
ID: um_tsmux
Three example scenarios illustrate the behaviour. Assume that the controller is configured to
switch at both “major” and “critical” levels.
The
confirm_time
values are configured as follows:
Major: 30 seconds
Critical: 5 seconds
Example scenario 1
•
A major event is detected and the switch controller jumps to the
wait_confirm
state and the alarm timer for the major event alarm level is started.
•
After 10 seconds, a critical event is detected and the alarm timer for the critical
event alarm level is started. After a further 5 seconds the critical event alarm timer
reaches its
confirm_time
and the controller will perform a switch. (The critical
alarm timer “beats” the major event timer in the “race” to switch).
Example scenario 2
•
A major event is detected and the switch controller jumps to the
wait_confirm
state and the alarm timer for the major event alarm level is started.
•
After 28 seconds, a critical event is detected and the alarm timer for the critical
event alarm level is started. After a further 2 seconds the major event alarm timer
reaches its
confirm_time
and the controller will perform a switch. (The major
alarm timer “beats” the critical event timer in the “race” to switch).
Example scenario 3
•
A major event is detected and the switch controller jumps to the
wait_confirm
state and the alarm timer for the major event alarm level is started.
•
After 10 seconds, a critical event is detected and the alarm timer for the critical
event alarm level is started. After a further 2 seconds the critical event clears and
the critical event timer is reset without a changeover occurring. After a further 18
seconds the major event alarm timer reaches its
confirm_time
and the controller
will perform a switch. (The critical alarm exits the “race” after 2 seconds without
a switch being carried out).
5.14.3 Manual switching on GPI
The service fallback module has the option to be manually controlled by a GPI (general purpose
input) signal on the relay/alarm connector (see
This GPI signal can also be used to trigger a unit reset. Naturally, only one of the functions can
be used at a time.
When used as an input to a service switcher, the GPI signal is used for manual switch over,
performing the same action as when pressing the ’switch to main’ or ’switch to spare’ buttons
(see
).
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