Lof - Fujitsu FLM 150 ADM Maintenance And Trouble Clearing

Maintenance and Trouble Clearing
FJTU-320-515-480
3.45

LOF

AID
Direction
Type
EC1 TRMT/RCV
OC3 TRMT/RCV
OC12
RCV
150 ADM
OC-3/
OC-12
DROPPED
SIGNAL
Issue 9, May 1999
Table 3-43: LOF (Loss of Frame)—Alarm Event
Probable
Cause
A framing • Inspect all aspects of the STS-1 link.
problem on the
• Check the remote sites for unit removal or failure. Refer
incoming STS-1
signal
• Verify that the coax cable is installed and connected
A framing • Check local receive and upstream transmit levels.
problem on the
• Verify the local receive optical levels, as well as the
incoming OC-3
signal
• Check the upstream ADM for optical channel unit
• Verify good optical connections to the local and far-end
• Clean the optical connectors (refer Section 5.1, Handling
• Verify cross-connects match on the upstream and
A framing • Check local receive and upstream transmit levels.
problem with the
• Verify the local receive optical levels and upstream
OC-12 signal
• Check the upstream ADM for optical channel unit
• Verify good optical connections to the local and far-end
• Clean the optical connectors (refer to Section 5.1,
FNC and FNC Customer Use Only
Suggested Corrective Action
to Section 4, Replacing Units, for the appropriate unit
replacement procedures.
securely.
upstream transmit optical levels. Clean the optical
connectors.
failure/removal.
OC-3 units and at the Lightwave Distribution Frame
(LDF) panels along the link (refer to Section 5.1,
Handling Fiber Cables, and Section 5.2, Cleaning,
Connecting, and Disconnecting the Optical Connectors).
Fiber Cables, and Section 5.2, Cleaning, Connecting, and
Disconnecting the Optical Connectors).
downstream nodes.
transmit optical levels. Clean the optical connectors.
failure/removal.
OC-12 units and at the LDF panels along the link (refer
to Section 5.1, Handling Fiber Cables, and Section 5.2,
Cleaning, Connecting, and Disconnecting the Optical
Connectors).
Handling Fiber Cables, and Section 5.2, Cleaning,
Connecting, and Disconnecting the Optical Connectors).
3.45: LOF
Vol. ll, Page 480.3-25