FIBER-LK (Fiber Link)
Issue 1 May 2002
8-831555-233-143
The following terms are used in the error descriptions:
LEDs for Circuit Packs on a Fiber Link
The amber LEDs on the three types of boards, SNI (TN573), EI (TN570), and DS1
Converter (TN574 or TN1654), that may be a part of the fiber link can help in
diagnosing problems with the fiber link. The amber LED states are as follows.
The flashing LED patterns take precedence over the active or standby LED
patterns.
If both endpoints of a fiber link (EI and/or SNI) are flashing with a fiber out of frame
pattern, a fast amber LED pattern (0.1 second on and 0.1 second off), check the
lightwave transceivers (if present). Both lightwave transceivers on the fiber link
must be of the same type. The 9823a shortwave transceiver and the 9823b
longwave transceiver must never be combined on the same fiber link because a
fiber out-of-frame condition will exist. The 9823a lightwave transceiver should be
used for distances up to 4900 feet and the 9823b lightwave transceiver should be
used for distances up to 25,000 feet.
Control Path The path between the two fiber endpoints that is necessary for the
two endpoint circuit packs to communicate.
Circuit Path The path between the two fiber endpoints that is necessary for
circuit switched phone calls to work.
Neighbor The circuit pack on the other end of the fiber.
Out of Frame A circuit pack reports fiber out of frame if it cannot detect valid data
coming from the fiber.
Packet Path The path between the two fiber endpoints that is necessary for
packet-switched messages to be sent between the two fiber
endpoints.
Table 8-316. SNI Amber LED Flashing Codes
Condition LED on LED off
Fiber out of Frame 0.1 second 0.1 second
In Frame, No Neighbor
1
1. The fiber is in frame, but no communication exists to the neighbor
0.5 second 0.5 second
SNI active Solid on Never off
SNI standby Never on Solid off
To Next Page
Loading...
