Product Overview 1-47
Physical Description
In order to provide a high density of ports, the FSIP uses special port adapters and adapter cables.
A port adapter is a daughter card that provides the physical interface for two FSIP ports. An adapter
cable provides the network connection for each port and determines the electrical interface type and
mode of that interface. Each FSIP comprises an FSIP board with two or four port adapters installed.
Additional port adapters are available as spares so that you can replace one that fails; however, you
cannot upgrade a four-port FSIP to an eight-port by adding port adapters. The four-port FSIP is not
constructed to support additional ports after it leaves the factory; it contains the circuitry to control
only one four-port module. For port adapter descriptions, refer to the section “Serial Port Adapters”
in this chapter.
The default FSIP microcode resides on a PLCC-type ROM in socket U81.
Figure 1-18 shows the FSIP LEDs. As with the other interface processors, the Enabled LED lights
to indicate that the FSIP is enabled for operation. The four LEDs adjacent to each port indicate the
state of that interface. The labels on each LED indicate the signal state when the FSIP port is in DTE
mode. However, the direction of the signals is reversed when the FSIP port is in DCE mode. For
example, a DCE device usually generates a clock signal, which it sends to the DTE device.
Therefore, when the Receive Clock (RxC) LED lights on a DTE interface, it indicates that the DTE
is receiving the clock signal from the DCE device. However, when the RxC LED lights on a DCE
interface, it indicates that the DCE is sending a clock signal to the DTE device. Because of limited
space on the FSIP faceplate, only DTE mode states are labeled on each port. Figure 1-18 shows the
interpretation of each LED for ports that are operating in DCE mode.
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