Fujitsu FLM 150 ADM Maintenance And Trouble Clearing page 77

Maintenance and Trouble Clearing
FJTU-320-515-480
Table 3-55: RFI (Remote Failure Indication)—Alarm Event (cont'd)
AID
Direction
Type
OC3 TRMT/RCV
OC12
RCV
150 ADM
OC-3/
OC-12
DROPPED
SIGNAL
OVTG TRMT
Issue 9, May 1999
Probable Cause
• TRMT: RFI detected on
the signal received from
the tributary ADM. The
local OC-3 transmit
unit may be sending a
bad optical signal to the
FLM 6.
• RCV: RFI detected on
the signal received from
the far end. The local
OC-3 transmit unit may
be sending a bad signal
to the far end.
RFI detected on the signal
received from the far end.
The local OC-12 transmit
unit may be sending a bad
signal to the far end.
RFI detected on the OVTG
signal received from the
tributary ADM. The local
transmit unit may be
sending a bad OVTG signal
to the tributary FLM 6.
FNC and FNC Customer Use Only
Suggested Corrective Action
• Check the output of the local optical transmit
unit for level degradation or dirty optical
connectors. Refer to Section 5.3, Measuring
Optical Power, to measure the local receive and
upstream transmit levels. In this practice, refer
to Section 5.1, Handling Fiber Cables, and
Section 5.2, Cleaning, Connecting, and
Disconnecting the Optical Connectors, to clean
the optical connectors.
• Verify that the outgoing fiber link for OC-3 is
installed and connected securely.
• Retrieve the alarms from the tributary FLM 6
(TRMT) or the far end (RCV) to determine the
faults detected there. The receive unit at the
FLM 6 or at the far end could have failed.
• Verify that the outgoing fiber link for OC-12 is
installed and connected securely.
• Retrieve the alarms from the tributary FLM 6
(TRMT) or the far end (RCV) to determine the
faults detected there. The receive unit at the
FLM 6 or at the far end could have failed.
• Check the output of the local optical transmit
unit for level degradation or dirty optical
connectors. Refer to Section 5.3, Measuring
Optical Power, to measure the local receive and
upstream transmit levels. In this practice, refer
to Section 5.1, Handling Fiber Cables, and
Section 5.2, Cleaning, Connecting, and
Disconnecting the Optical Connectors, to clean
the optical connectors.
• Check the fiber link and perform trouble analysis
procedures as necessary.
• Retrieve the alarms from the tributary FLM 6 to
determine the faults detected there. The receive
unit at the tributary FLM 6 could have failed.
3.57: RFI
Vol. ll, Page 480.3-35