Fujitsu FLM 150 ADM Maintenance And Trouble Clearing page 53

Maintenance and Trouble Clearing
FJTU-320-515-480
These BERSDL and BERSFL alarm messages indicate line-level problems that
may only exist between line terminating equipment (LTE). Figure 3-1 shows how
to determine exactly where the line BER problem is located. Notes 1 and 2 (below
the figure and referenced within the circles) give examples of how to determine
problem locations.
Line
Node A
OC- n
ADM
Link A
1
DS3
Note 1: If a line BER problem is detected here, the bit errors may be caused by a fiber problem on Link A or a
bad transmitter at Node B.
Note 2: If a line BER problem is detected here, the bit errors may be caused by a fiber problem on Link B or
Link C, a bad plug-in unit at the REGEN site, or a bad transmitter at Node C or Node D. If Node C is actually
line terminating and not a true REGEN, the bit errors are caused by problems on Link B only.
Issue 9, May 1999
Section
Node B
OC- n
ADM
Link B
2
Figure 3-1: Line BER Causes
FNC and FNC Customer Use Only
3.11: BERSDL and BERSFL
Line
Section
Node C
OC- n
REGEN
Link C
Vol. ll, Page 480.3-11
Node D
ADM
DS3