Installing the Router 3-131
Connecting Interface Cables
Note Each station in a ring refers to its neighbor stations as upstream or downstream neighbors.
The stream is based on the signal flow on the primary ring. A station receives the primary signal from
its upstream neighbor and transmits the primary signal to its downstream neighbor.
This section also provides instructions for connecting an optical bypass switch to a dual attachment
multimode network connection. Because the method of connecting optical bypass switches varies
between different manufacturer’s models, refer to the documentation for your particular bypass
switch for correct connection instructions. If you are installing an optical bypass switch, proceed to
the section “Installing an Optical Bypass Switch” later in this chapter.
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. This
product meets the Class 1 Laser Emission Requirement from CDRH FDDI.
Single Attachment Connections
A FIP that is connected as a single attachment station (SAS) typically is connected to the ring
through a concentrator. The FIP receives and transmits the signal through the same physical
interface, usually PHYA. Depending upon whether you are connecting to a single-mode of
multimode fiber network, connect the FIP as follows:
• Single-mode—Connect one single-mode interface cable to the PHYA transmit port and one to
the PHYA receive port. (See Figure 3-9.) Connect the opposite end of each cable to the
concentrator transmit and receive ports as specified by the concentrator manufacturer.
• Multimode—Connect the multimode interface cable between one of the M ports on the
concentrator and the PHYA port on the FIP. (See Figure 3-10.) Be sure to observe and match the
port labels on the MIC and the FIP ports; connect receive on the cable to PHYA receive. Follow
the concentrator manufacturer’s instructions for connecting the opposite end of the cable.
If you are connecting other FIPs as dual attachment stations (DASs) proceed to the following
section. Otherwise, proceed to the section “Connecting the Console Terminal” later in this chapter.
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