Maintenance Object Repair Procedures
555-233-123
10-234 Issue 4 May 2002
16 Loss of Signal:
LOS
The fiber is not connected properly to the ATM-TRK board or ATM
switch (or to the multiplexer section [MUX] if present).It is possible
that the board transceivers are not functioning properly.
Run test board UUCSS command.
If Test #1259 fails with Error Code 16, connect a fiber back-to-back
in a looped mode (one strand of fiber connecting the transmit
transceiver to the receive transceiver of the board) and see if the
yellow LED flash goes away. If it does the problem is off-board.
If the yellow LED continues to flash, replace the circuit pack.
17 Loss of Frame:
LOF
The fiber signal cannot obtain or maintain STM-1/OC-3 framing.
Try to more the fiber on the ATM switch side to a different port.
If the problem persists, reset the circuit pack (reset board UUCSS).
18 Multiplexer
Section Alarm
Indication Signal:
MS_AIS
There is a major problem on the far end (between multiplexer
section [MUX] and the switch) that prohibits the circuit pack from
sending a valid signal.
See if the ports at the MUX and/or the ATM switch are connected
snugly.
Run test board UUCSS command
If Test #1259 fails with Error Code 18, connect a fiber back-to-back
in a looped mode (one strand of fiber connecting the transmit
transceiver to the receive transceiver of the board) and see if the
yellow LED flash goes away.
If it does the problem is off-board.
If the yellow LED continues to flash, replace the circuit pack; if the
error persists, escalate the problem.
19 Multiplexer
Section Remote
Defect Indicator:
MS_RDI
The far-end is detecting a major problem with the signal that this
board is transmitting.
Make sure the ATM switch port (or a MUX port, if present between
ATM switch and the ATM-TRK board) is the same as the ATM-TRK
circuit pack’s cable interface
Run test board UUCSS command.
If Test #1259 fails with Error Code 19, connect a fiber back-to-back
in a looped mode (one strand of fiber connecting the transmit
transceiver to the receive transceiver of the board) and see if the
yellow LED flash goes away.
If it does the problem is off-board.
If the yellow LED continues to flash, replace the circuit pack; if the
error persists, escalate the problem.
Table 10-93. Error type 1281 Aux Data and repair procedures — Continued
Aux
Data
Alarm
Description Repair procedure
Continued on next page
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