Connecting the Fan Tray Alarm Port
The fan tray includes an alarm port that maps to 4 dry contact alarm inputs.
The pins on the alarm port are passive signals and can be configured as Normally Open (an alarm generated
when current is interrupted) or Normally Closed (an alarm is generated when a circuit is established) alarms.
You can configure each alarm input as critical, major, or minor. An alarm triggers alarm LEDs and alarm
messages. The relay contacts can be controlled through any appropriate third-party relay controller. The
open/close configuration is an option controlled in IOS.
To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety,
connect the alarm ports only to intra-building or unexposed wiring or cable. The intrabuilding cable must
be shielded and the shield must be grounded at both ends. The intra-building port(s) of the equipment or
subassembly must not be metallically connected to interfaces that connect to the OSP or its wiring. These
interfaces are designed for use as intra-building interfaces only (Type 2 or Type 4 ports as described in
GR-1089-CORE) and require isolation from the exposed OSP cabling. The addition of Primary Protectors
is not sufficient protection in order to connect these interfaces metallically to OSP wiring.
Warning
Only Pins 1, 2, 4, 5, and 8 are available for customer use. The remaining pins are for Cisco manufacturing
test, and should not be connected. Use a shielded cable for connection to this port for EMC protection. Table
5-6 summarizes the pinouts on the alarm port in Troubleshooting.
Step 1
Attach an RJ45 cable to the alarm port.
Step 2
Attach the other end of the RJ45 cable to the relay controller.
What to Do Next
For information about how to map alarm inputs to critical, major, and minor alarm conditions, see the Cisco
ASR 903 Router Software Configuration Guide.
Connector and Cable Specifications
For more information on cable specifications and pinouts, see Troubleshooting.
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
135
Installing the Cisco ASR 903 Router
Connecting the Fan Tray Alarm Port
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