HP 445 manual Fddi Port, Thru

Router Operation

Interpreting Back-Panel LEDs

FDDI Port

"Thru" "Wrap"

Figure 2-6. FDDI "Thru" and "Wrap A" Operation

Thru (green): When lit, this LED indicates that packets are being received on the primary input line of port A and transmitted on the primary output line of port B.

Wrap A and B (green) LEDs: If either A or B is lit, either a break has occurred in the FDDI ring or the attached neighbor’s hardware has failed. In these cases the router is transmitting and receiving on the indicated port only (and not on both ports). In this case, the indicated port is receiving on the input line and transmitting on the output line for that port. This occurs in either of the following cases:

The unlit port is not communicating.

A Dual Attach Station (DAS) attached to the unlit port is not functional.

These cases occur, for example, when the cable connection to the unlit port is interrupted or when a DAS connected to the unlit port is down.

Sig Det (green): Signal Detection is lit when the router detects an incoming signal on the FDDI port, and should be lit continuously.

Ring OP (green): The Ring OP LED is continuously lit if the router is inserted and operating in an FDDI ring and is in either Thru or Wrap mode.

Features 2

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