Chapter 5.Loop Back & BERT Testing
55
May 2011
Chapter 5. Loop Back and BERT Testing
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.
Table 5-1 LED indicators
Indicator Color Function
Power Green ON when power is on.
Sig Loss Red ON when received signal is lost.(E1 Line)
Sync Loss Red ON when received frame sync is lost.(E1 Line)
Alarm Red
ON when E1 has an alarm. (Includes: BPV error / CRC4 error / Frame
slip / All one / Remote alarm)
RD Yellow
ON when SPACE is being received. Off when MARK is being
received.
Flashing when data is received.
TD Yellow
ON when SPACE is being transmitted, Flashing when data is
transmitted.
Error Red ON when BERT function is activated and detects bit errors.
Test Red
ON when the ETU-01A is in any loop back mode or BERT function is
on. Flashing when in loop back initiated by the remote unit.
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