Cisco 7000 Series Hardware Installation And Maintenance Manual page 133

FIP
To primary ring
From secondary ring
To secondary ring
From primary ring
Bypass operation
The optical bypass control port on the FIP is a six-pin mini-DIN receptacle. Some optical bypass
switches use DIN connectors, and some use a mini-DIN. A DIN-to-mini-DIN control cable
(CSB-FMDD) is included with the CX-FIP-MM or CX-FIP-SS to connect optical bypass switches
that use the larger DIN connector. Up to 100 milliamperes of current can be supplied to the optical
bypass switch.
Following are general instructions for connecting an optical bypass switch to the FIP; however, your
particular bypass switch may require a different connection scheme. Use these steps as a general
guideline, but refer to the instructions provided by the manufacturer of the switch for specific
connection requirements.
•
Connect the bypass switch to the ring. Unless the documentation that accompanies the bypass
switch instructs otherwise, observe the same guidelines for connecting the A/B ports on the
bypass switch that you would to connect the ring directly to the FIP ports. Use the receive label
on the cable MIC connectors as a key and connect the cables to the network (ring) side of the
bypass switch as follows:
— Connect the cable coming in from the primary ring (from PHY B at the preceding station) to
the PHY A receive port on the network (ring) side of the bypass switch. This also connects
the signal going out to the secondary ring to the PHY A transmit port.
— Connect the cable coming in from the secondary ring (from PHY A at the preceding station)
to the PHY B receive port on the network (ring) side of the bypass switch. This also connects
the signal going out to the primary ring to the PHY B transmit port.
•
Connect the bypass switch to the FIP. Unless the documentation that accompanies the bypass
switch instructs otherwise, consider the bypass an extension of the FIP ports and connect A to A
and B to B. The network cables are already connected to the bypass switch following the standard
B-to-A/A-to-B scheme.
— Connect an interface cable between the PHY A port on the station (FIP) side of the bypass
switch and the FIP PHY A port.
— Connect an interface cable between the PHY B port on the station (FIP) side of the bypass
switch and the FIP PHY B port.
Optical bypass Optical bypass
switch control cable
Connecting Interface Cables
PHY A PHY B
TX RX TX RX
Installing the Router 3-21