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FIBER-LK (Fiber Link)
Issue 1 June 2005 1251
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 428: 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