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Chapter 6. Diagnostics
6-6 MX2800 STS-1 User Manual 61200659L1-1
Figure 6-7. Diagnostics Menu with BERT Selected
VT BERT
A
VT
BERT
enables the MX2800 STS-1 to perform a “head-to-
head”
BERT
test towards the STS-1 network. Selecting
VT
BERT
will replace all incoming T1/E1 traffic for the T1/E1 mapped to the
selected VT with an unframed QRSS pattern towards the network.
When
VT
BERT
is selected, additional menu items will appear to
show the state of pattern synchronization, cumulative error count,
and a clear error count option. Selecting
D
ATA
M
ODE
will cease
QRSS pattern generation and substitution of the incoming data
stream. See Figure 6-8 on page 6-7 for an illustration of this test.
Only one T1 port may engage a
CSU L
OOPBACK
,
CSU L
OOPBACK
W
/B
ERT
, or a
L
INE
B
ERT
. If a
CSU L
OOPBACK
,
CSU L
OOPBACK
W
/B
ERT
, or a
L
INE
B
ERT
is already active at the time a new
CSU
L
OOPBACK
,
CSU L
OOPBACK
W
/B
ERT
, or
L
INE
B
ERT
is selected, the
former test will be terminated and the latter test will be engaged.
When in
VT
BERT
mode, only the
D
ATA
M
ODE
option for the
VT/Port under test may be selected. Selecting any other option will
cause an error message to be displayed.