Cisco ASR 907 Installing page 49

Installing the Cisco ASR 907 Router
For information about the BITS port pinouts, see Troubleshooting.
Note
Warning
Connecting Cables to a GNSS Interface
The following sections describe how to connect cables from the Cisco ASR 907 Router to a GPS unit for
input or output timing of frequency.
Note
A Y-cable is required to connect to a primary and backup RSP in order to ensure that the router continues to
transmit timing signals in the event of a network failure. For a mini-coax connection, this Y-cable can be part
number CAB-BNC-7INY (7 inch BNC Y-cable). For an Ethernet connection, this Y-cable can be a RJ45 Cat5
1-to-2 splitter (3 female port RJ45 connector).
Note 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.
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
Cisco ASR 907 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 Cisco ASR 907 Router.
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.
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.
Connecting Cables to a GNSS Interface
Installing the Cisco ASR 907 Router
49