Los - Fujitsu FLM 150 ADM Maintenance And Trouble Clearing

Maintenance and Trouble Clearing
FJTU-320-515-480
Table 3-45: LOP (Loss of Pointer)—Alarm Condition (cont'd)
AID
Direction
Type
STS1 TRMT/RCV
OVTG TRMT
3.48

LOS

AID
Direction
Type
EC1 TRMT/RCV
OC3 TRMT/RCV
Issue 9, May 1999
Probable Cause
An STS-1 loss of Verify the timing source at the upstream sites.
pointer; indicates
that a timing
failure has
occurred
upstream
An OVTG loss of Verify the timing source at the FLM 6 site.
pointer, which
indicates a
timing failure at
the source FLM 6
Table 3-46: LOS (Loss of Signal)—Alarm Event
Probable Cause
A loss of signal on • Check for an STS-1 source near- or far-end removal
an EC-1 interface
input
• Verify that the coax cable is installed and connected
An OC-3 loss of • Check the upstream ADM for optical channel unit
signal
• Check the fiber link and perform trouble analysis
• Verify the local receive and remote transmit optical
• Verify optical connections to the local and far-end
FNC and FNC Customer Use Only
Suggested Corrective Action
Suggested Corrective Action
failure.
securely.
failure/removal.
procedures as necessary.
levels.
OC-3/OC-12 units and at the Lightwave Distribution
Frame (LDF) panels along the link. See Section 5.1,
Handling Fiber Cables, and Section 5.2, Cleaning,
Connecting, and Disconnecting the Optical Connectors.
3.48: LOS
Vol. ll, Page 480.3-28