Fujitsu FLM 150 ADM Maintenance And Trouble Clearing page 68

Maintenance and Trouble Clearing
FJTU-320-515-480
Table 3-43: LOF (Loss of Frame)—Alarm Event (cont'd)
AID
Direction
Type
OVTG
TRMT
150 ADM
OC-3/
OC-12
ADDED
SIGNAL
T1 NA
TRMT
(LC1A-D1 or
LC1A-D1E unit
installed)
TRMT/RCV
(LC1A-D1E2
unit installed)
T2 TRMT
T3 TRMT/RCV
Issue 9, May 1999
Probable
Cause
A framing • Check the OVTG link.
problem on the
• Check the remote FLM 6 for OVTG unit removal or
incoming
failure. Refer to Section 4, in this practice, or the Table of
low-speed
Contents, located in the front of this practice, to select
OVTG signal
the appropriate unit replacement procedure.
• Verify the local receive and upstream transmit optical
levels. Refer to Section 5.3, Measuring Optical Power, to
measure the local receive and upstream transmit levels.
• Clean the optical connectors (refer to Section 5.1,
Handling Fiber Cables, and Section 5.2, Cleaning,
Connecting, and Disconnecting the Optical Connectors).
• Check the fiber link and perform trouble analysis
procedures as necessary.
A failure within Refer to the timing source vendor documentation for
the timing procedures to isolate and repair failure.
source (the
BITS clock)
A failure within • If the expected DS1 is framed, perform far-end site
a DS1 far-end trouble analysis procedures.
NE (such as a
• If the expected DS1 is unframed, reprovision the facility.
channel bank),
• Check Section 5.5, Correcting the T1 or T3 Framing
or the ADM is
Format, to verify the T1 or T3 framing.
provisioned for a
framed DS1 and
is receiving an
unframed DS1
A failure within • If the expected DS2 is framed, initiate trouble analysis
the DS2 far-end procedures for the far-end site.
NE, or the ADM
• If the expected DS2 is unframed, reprovision the facility
is provisioned for
for FMT=UNFR.
a framed DS2
and is receiving
an unframed
DS2
A failure within • If the expected DS3 is framed, initiate trouble analysis
the DS3 far-end procedures for the far-end site.
NE, or the ADM
• If the expected DS3 is unframed, reprovision the facility
is provisioned for
for FMT=UNFR.
a framed DS3
• Check Section 5.5, Correcting the T1 or T3 Framing
and is receiving
Format, to verify the T1 or T3 framing.
an unframed
DS3
FNC and FNC Customer Use Only
Suggested Corrective Action
Vol. ll, Page 480.3-26
3.45: LOF