Installing An Optical Bypass Switch - Cisco 7000 Hardware Installation And Maintenance

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Mixed mode—Follow the cabling guidelines described previously to connect the multimode and
single-mode interface cables. Figure 3-14 shows that the primary ring signal is received on the
multimode PHY A receive port and transmitted from the single-mode PHY B transmit port. Your
configuration may be the opposite, with multimode on PHY B and single-mode on PHY A.
Connect the cables to the FIP ports as follows:
— Connect the cable coming in from the primary ring to the PHY A receive port, and connect
— Connect the cable coming in from the secondary ring to the PHY B receive port. This also
If you are connecting an optical bypass switch, proceed to the next section. Otherwise, proceed to
the section Connecting the Console Terminal later in this chapter.
Figure 3-14
o single-mode
To multimode

Installing an Optical Bypass Switch

An optical bypass switch is a device installed between the ring and the station that provides
additional fault tolerance to the network. If a FIP that is connected to a bypass switch fails or shuts
down, the bypass switch activates automatically and allows the light signal to pass directly through
it, bypassing the FIP completely. A port for connecting an optical bypass switch is provided on the
multimode/multimode FIP (CX-FIP-MM) and the single-mode/single-mode FIP (CX-FIP-SS) only.
(See Figure 3-15 for CX-FIP-MM connections and Figure 3-16 for CX-FIP-SS connections.)
the signal going out to the secondary ring to the PHY A transmit port.
connects the signal going out to the primary ring to the PHY B transmit port.
FDDI Dual Attachment Network Connections, Single-Mode and Multimode
FC connectors (2)
Transmit
network
Receive
network
MIC connector
Connecting Interface Cables
Installing the Router 3-135