Bersdp And Bersfp - Fujitsu FLM 150 ADM Maintenance And Trouble Clearing

Maintenance and Trouble Clearing
FJTU-320-515-480
3.12

BERSDP and BERSFP

Table 3-10: BERSDP and BERSFP (Bit Error Rate Signal Degrade/Fail-Path)—Alarm Event
AID
Direction
Type
STS-1
RCV
VT-1
150 ADM
OC-3/
OC-12
DROPPED
SIGNAL
These BERSDP and BERSFP alarm messages indicate path-level problems. Refer
to Figure 3-2 for help in finding the problem.
Node A
ADM
DS3
Note 1: If an STS path BER problem is detected here, the bit errors are not caused by a problem on any of the
fiber links. The bit errors may be caused by a plug-in unit at the source or destination.
Issue 9, May 1999
Probable Cause
• The STS signal
demultiplexed and
dropped from the
OC-3/OC-12 has
exceeded its signal
degrade threshold.
• The BER is detected
at a drop port, but the
problem could be
caused by a plug-in
unit along the
Sychronous Optical
Network (SONET)
path.
1
Node B
OC- n
ADM
Link A
Figure 3-2: Path BER Causes
FNC and FNC Customer Use Only
Suggested Corrective Action
• Examine the network for other path BER
problems and retrieve PM data to find a
possible common source of the bit errors.
• If a tributary channel unit is a possible source
of the bit errors, perform a manual protection
switch to the protection unit. If the BER
alarm clears, replace the original Working
unit. Refer to Section 4, in this practice, or the
Table of Contents, located in the front of this
practice, to select the appropriate unit
replacement procedure.
• If the trouble can be isolated to an original
HC1A unit, replace the unit. Refer to
Section 4.12, Replacing the OC-3 Optical
Channel (HC1A and MC6A) Units, and
Section 4.16, Replacing the Low-Speed
Channel–OVTG (LC1A-F6xx) Unit.
Caution: Replacing an HC1A unit will cause
hits on previously working traffic. Perform this
step only after careful fault isolation.
Path
Node C
OC- n
REGEN
Link B
3.12: BERSDP and BERSFP
Node D
OC- n
ADM
Link C
Path
Origination
DS3
Vol. ll, Page 480.3-12