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3.11: BERSDL and BERSFL
Issue 9, May 1999
FNC and FNC Customer Use Only
Vol. ll, Page 480.3-11
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.
Node A
ADM
REGEN
Node B
Node C
Node D
OC-
n
Link A
Link B
Link C
1
2
d6198
Line
Section
Section
Line
DS3
ADM
DS3
OC-
n
OC-
n
ADM
Figure 3-1: Line BER Causes
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.
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