Line Bert - ADTRAN MX2820 System Manual

MX2820 System Manual
When in either NIU Loopback or NIU Loopback w/BERT, only the
Data Mode for the T1 under test can be selected. Selecting any
other option results in an error message being displayed.

Line BERT

A Line BERT enables the M13 MUX to perform a "head-to-head" BERT test towards the CSU.
Selecting Line Bert replaces all incoming network traffic for the selected T1 line with the
selected BERT pattern towards the CSU. When Line BERT is selected, additional menu items
appear to show: the state of pattern synchronization, the cumulative error count, and a clear
error count option. Selecting Data Mode stops the BERT pattern generation and substitution
of the incoming data stream.
When In Line BERT Mode, Only the Data Mode option for the T1
line under test can be selected. Selecting any other option results
in an error message being displayed.
Only one T1 port can engage a CSU loopback, CSU Loopback w/
BERT, NIU Loopback, NIU Loopback w/BERT, or a Line BERT. If
one of these tests is already active at the time a new test is
selected, the former test is terminated and the latter test is
engaged.
P/N 1186002L3 supports enhanced T1 loopback testing which
allows a test to be active on multiple T1 ports at the same time. The
options available are CSU Loopback, CSU Loopback w/BERT, NIU
Loopback, NIU Loopback w/BERT, or Line BERT.
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