Cisco ASR 902 Installation Manual page 39

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Installing the Cisco ASR 902 Router

The following sections describe how to connect timing cables to the Cisco ASR 902 Router:

Connecting a Cable to the BITS Interface

The following steps describe how to connect a cable to the router's BITS port:

Step 1

Confirm that the router is powered off.

Step 2

Connect one end of the cable to the BITS port using a straight-through, shielded RJ48C-to-RJ48C cable.

Step 3

Connect the other end to the BTS patch or demarcation panel at your site.

Step 4

Turn on the power to the router.

For information about the BITS port pinouts, see Troubleshooting.

Use of two BITS sources or a Y-cable is optional. Each BITS input port is routed to both the RSPs, so that the

Note

SETS device on each RSP has visibility to both the BITS inputs.

To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety, connect

Warning

the BITS 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. Statement

Connecting Cables to a GPS Interface

Note

When installing the cables to the RSP, we recommend that you leave a service loop of extra cable to enable

fan tray removal.

The following sections describe how to connect cables from the Cisco ASR 902 Router to a GPS unit for

input or output timing of frequency:

Connecting a Cable to the Input 10-MHz or 1-PPS Interface

Step 1

Connect one end of a mini-coax cable to the GPS unit.

Step 2

Connect the other end of the mini-coax cable to the 10-MHz or 1-PPS port on the RSP of the Cisco ASR 902 Router.

Cisco ASR 902 and ASR 902U Aggregation Services Router Hardware Installation Guide

Connecting Timing Cables

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