32 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
If an alarm condition occurs, the management card determines whether the
alarm state is critical, major, or minor, actuates the corresponding alarm
relays, causes the appropriate lamps to light, and generates TL1 alarm
message(s) via the local or LAN communication interface.
1.3.7 Alarms
Alarms are indicated by shelf and card status lamps, and TL1 messages
reported via the local or LAN communication interface. In addition, contact
closures are provided.
As shown in Figure 4-6, there are front panel alarm LEDs for both "System"
and "Shelf" alarms. A shelf alarm is one that occurs from within the
TimeHub shelf, a system alarm is one that is sensed via one of the external
alarm wirewrap inputs on the input/alarm card (see Figure 4-4). If an alarm
is sensed on any of these 10 external alarm inputs, it will show as a
"System" alarm on the management card front panel. All other alarms will be
"Shelf" alarms.
If there should happen to be alarms simultaneously occurring that have
different severity levels, only the one of highest severity will be shown on the
front panel LEDs if the alarms are both either in the "System" or "Shelf"
category. For example, if there are both MAJOR and MINOR shelf alarms
present, only the MAJOR alarm LED will be lit in the "Shelf" alarm row. In
this case, if the MAJOR alarm ends, then the MINOR alarm LED will light
(assuming that the source of that alarm is still present) since this is now the
highest severity shelf alarm.
If there is a MAJOR shelf
alarm and a MINOR system alarm (any of the
external alarms in 7 to 10 range) then the MAJOR LED will be lit for the
shelf alarm row and the MINOR LED will be lit for the system alarm row. In
other words, it is possible to have alarm LEDs of different severity
illuminated if one is a shelf alarm and the other a system alarm.
In all cases, all current alarms will be reported via the TL1 command
interfaces (serial and network) and can be retrieved at any time via the
RTRV-ALM query (see TL1 reference manual). If there are multiple alarms of
the same and different severity, all will be provided in the RTRV-ALM
response.
1.3.7.1 Contact Closure Inputs
Up to 10 contact closure inputs are provided to connect to relay outputs of
equipment external to the shelf.
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