Connecting The Fan Tray Alarm Port; Connector And Cable Specifications - Cisco ASR 903 Installing Manual

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Installing the Cisco ASR 903 Router

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,

Warning

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.

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.

For more information on cable specifications and pinouts, see Troubleshooting.

Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide

Connecting the Fan Tray Alarm Port

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