Troubleshooting guide

MX2820 System Manual
5-100 61186003L1-1D
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 Data Mode
will cease QRSS pattern generation and substitution of the incoming data stream. See Figure
5-70 for an illustration of this test.
NOTE
When in VT BERT mode, only the Data Mode option for the VT/Port
under test can be selected. Selecting any other option will cause an
error message to be displayed.
Figure 5-70. VT Bert Test
Line BERT
A Line BERT enables the MX2820 STS-1 to perform a “head-to-head” BERT test towards the
T1/E1 line mapped to the VT selected. Selecting Line BERT will replace all outgoing T1/E1
traffic for the T1/E1 mapped to the selected VT with an unframed QRSS pattern. When Line
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 Data Mode
will cease QRSS pattern generation and substitution of the incoming data stream. See Figure
5-71 for an illustration of this test.
NOTE
When in Line BERT mode, only the Data Mode option for the VT/
Port under test can be selected. Selecting any other option will
result in an error message being displayed.
STS-1
MAPPER
T1/E1 LIU
(1 of 28)
T1/E1 LIU
(28 of 28)
STS-1
LIU
CODEC
(1 of 28)
CODEC
(28 of 28)
BERT
GENERATOR
BERT
CHECKER