Avitec AB FD-3100A ユーザーズマニュアル
2.3 System
Alarms
The FiberDAS has four ways of indicating alarms.
1.
LEDs: the Hub Shelf and the Remote Transceiver have status indicators for power on and
alarm conditions.
alarm conditions.
2.
Hub Shelf Rear Panel DB37 Connector: The “critical” alarms are available here as TTL
levels. In addition, three pins provide a contact closure summary alarm (see Alarms in the
specifications).
levels. In addition, three pins provide a contact closure summary alarm (see Alarms in the
specifications).
3.
Craft serial port: The system status may be monitored locally with a computer through the
front panel Craft serial port. The main purpose of this port is initial system setup. This
includes specifying which alarms are critical, setting the local system telephone number and
specifying the action to be taken when there is a critical alarm (dial up the NOC or a service
technician’s pager). If more than one Hub Shelf is being used at the same location, one of the
hubs may be configured as the Master, reporting alarms for all connected Hubs. One can also
give the system an easily recognizable name as well as naming the Remote Transceiver
locations so that the system and the fault location may be easily identified at the Network
Operating Center (NOC) using the NMS.
front panel Craft serial port. The main purpose of this port is initial system setup. This
includes specifying which alarms are critical, setting the local system telephone number and
specifying the action to be taken when there is a critical alarm (dial up the NOC or a service
technician’s pager). If more than one Hub Shelf is being used at the same location, one of the
hubs may be configured as the Master, reporting alarms for all connected Hubs. One can also
give the system an easily recognizable name as well as naming the Remote Transceiver
locations so that the system and the fault location may be easily identified at the Network
Operating Center (NOC) using the NMS.
4.
Dial-Up: the system may be connected to a standard RJ-11 telephone jack through which it
communicates with the NOC or a service technician’s pager. Using network management
software at the NOC, the network administrator can poll and monitor thousands of remote
FiberDAS systems. The system and alarms can be configured by way of the front panel serial
port using the Remec MobileCraft software (see separate MobileCraft manual).
communicates with the NOC or a service technician’s pager. Using network management
software at the NOC, the network administrator can poll and monitor thousands of remote
FiberDAS systems. The system and alarms can be configured by way of the front panel serial
port using the Remec MobileCraft software (see separate MobileCraft manual).
Using the alarms provided, the cause of a critical failure can be determined with high confidence. For
instance, if the Node Function alarm is associated with a Plug-In laser alarm, the Plug-In has failed and
must be replaced. If the Node Function alarm is associated with a Received Optical Power Low at the Plug-
In, either the Remote Transceiver laser has failed or the fiberoptic cable has been broken or damaged. The
service technician would come with a replacement Remote Transceiver. If, upon inspecting the Remote
Power Supply in question, the LEDs indicate no failure, the fiber path would have to be inspected. This
should be relatively easy to track down since damage would have to be associated with some other work
going on at the site or someone had deliberately disconnected the optical cable from the unit. Finally, a
Node Function alarm not associated with any other alarm at the Hub Shelf would indicate a failure of the
Remote Transceiver downlink amplifier chain. This would be confirmed by inspection of the Remote
Power Supply in question for that particular LED. The complete troubleshooting matrix is given at the end
of this manual and is included in the separate MobileCraft manual. Or, it can be used to program another
NMS to recommend the proper action to be taken.
instance, if the Node Function alarm is associated with a Plug-In laser alarm, the Plug-In has failed and
must be replaced. If the Node Function alarm is associated with a Received Optical Power Low at the Plug-
In, either the Remote Transceiver laser has failed or the fiberoptic cable has been broken or damaged. The
service technician would come with a replacement Remote Transceiver. If, upon inspecting the Remote
Power Supply in question, the LEDs indicate no failure, the fiber path would have to be inspected. This
should be relatively easy to track down since damage would have to be associated with some other work
going on at the site or someone had deliberately disconnected the optical cable from the unit. Finally, a
Node Function alarm not associated with any other alarm at the Hub Shelf would indicate a failure of the
Remote Transceiver downlink amplifier chain. This would be confirmed by inspection of the Remote
Power Supply in question for that particular LED. The complete troubleshooting matrix is given at the end
of this manual and is included in the separate MobileCraft manual. Or, it can be used to program another
NMS to recommend the proper action to be taken.
2.4 Hub Shelf and Remote Power Supply Battery Charge Monitoring and
Replacement
Both the Hub Shelf and the Remote Power Supply have a battery backup. While connected to mains
power, the battery is kept charged by a charging circuit. Once AC mains power is first connected, the
charging circuit waits 48 hours before starting the battery test circuit. This circuit checks to open circuit
battery voltage every ten seconds. Once the circuit detects the battery voltage drops below approximately
12 Volts, the BATT LOW alarm is activated. At the beginning of life, the battery provides approximately
15 to 20 minutes of system backup. At end of life, the backup time is about 8 to 10 minutes. It is expected
that the batteries should be replaced every 1.5 to 2 years.
2-7