Chapter 5. Loop Back and BERT Testing
89
November 2001
5.1 General
The ETU-01A diagnostics functions include:
Status indications and messages.
User activated loop back.
Integrated Bit Error Rate Test (BERT).
The loop back tests and integrated BERT are out-of-service
tests which may be activated via the user data port (utilizing the
V.54 standard), the front panel LCD interface, from the console
terminal menu or via SNMP (when option is installed). The ETU-
01A offers bit error rate testing on both the synchronous data
channel and the E1 line, using a locally generated pseudo-random
sequence. To provide compatibility with other BERT equipment,
you may select the pseudo-random pattern from a list of available
patterns.
5.2 Status Indicators and Messages
Indicators:
The status, of the ETU-01A, is indicated by viewing the Signal
Loss, Sync Loss, Alarm, Error and Test LED indicators. User
data channel activity is indicated by the corresponding RD and TD
LED indicators.
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