Connecting Timing Cables
The following sections describe how to connect timing cables to the Cisco NCS 560-4 Router:
When installing the cabling to the RSPs, we recommend that you leave a service loop of extra cabling sufficient
to allow for fan tray removal.
Note
Connecting Cables to the BITS Interface
The following steps describe how to connect a cable to the router BITS port:
Procedure
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 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 RSPs, so
that SETS device on each RSP has visibility to both BITS inputs.
Note
To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and
safety, connect 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.
Warning
Connecting Cables to the Input 10Mhz or 1PPS Interface
Procedure
Step 1 Connect one end of a mini-coax Y-cable to the GPS unit.
Step 2 Connect one end of the split-side Y-cable mini-coax to the 10Mhz or 1PPS port on the primary RSP of the
router.
Step 3 Connect the other end of the split-side Y-cable mini-coax to the 10Mhz or 1PPS port on the backup RSP of
the router.
Cisco NCS 560-4 Router Hardware Installation Guide
101
Installing the Cisco NCS 560-4 Router
Connecting Timing Cables
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