DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-849FIBER-LK (Fiber Link)
9
The following terms are used in the error descriptions:
LEDs for Circuit Packs on a Fiber Link
The yellow 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 yellow 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 yellow 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 9-321. Switch Node Interface Yellow 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
