To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety, connect
the ToD 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 a Cable to the BITS Interface
The following steps describe how to connect a cable to the router’s 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 the power to the router.
For information about the BITS port pinouts, see the Troubleshooting section.
Connecting Cables to the GPS Interface
The sections describe how to connect cables from the Cisco ASR 920 Router to a GPS unit for input or output
timing of frequency:
When installing the cables to the RSP, we recommend that you leave a service loop of extra cable to enable
fan tray removal.
Note
Connecting a Cable to the Input 10-Mhz or 1-PPS Interface
Procedure
Step 1 Connect one end of a shielded mini-coax cable to the GPS unit.
Step 2 Connect the other end of the shielded mini-coax cable to the 10-Mhz or 1-PPS port on the RSP of the Cisco
ASR 920 Router.
Installing the Router
51
Installing the Router
Connecting a Cable to the BITS Interface
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