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RGUS 125 35
8.1.3.2 BERT on leased lines (permanent circuits)
A number of variations are possible in testing the
permanent circuit with the bit error rate test.
In the simplest case, a B-channel loop will be set up
at the remote end.
After selection of the channel to be tested (B-channel
or D-channel), the ARGUS will send the test pattern,
receive it back and evaluate it accordingly.
The displays and operation are, in largest part,
similar to those of a BERT on a dial-up connection
(see page 57) with the exception that you need not
enter call numbers or select a service.
In the case of a BRI access in end-to-end mode
(page 57 and page 64), it is also possible to run a
BERT in the D-channel with HDLC-framing (setting:
D-channel transp.).
Optional:
128k BERT on a BRI or U-interface permanent circuit
Start BERT
The ARGUS will display
- the bit pattern, B-channel used and the bitrate
- Synchronicity of the bit pattern (synchron)
- Sync.time in h:min:sec (the period of time that the
ARGUS has been synchronised)
- LOS counter
- the bit errors that have occurred
Once it is over, the ARGUS will display the results of
the BERT (page 60). For information on saving the
test results, see page 62.
Select a B-channel
< ERROR > to insert artificial bit errors to test the
reliability of the BERT.
< RESET > The test time and bit error counter
will be reset.
< TM > Start Test Manager (see page 96).
Select a channel
Enter the B-channel on
the keypad.
On a BRI access:
35


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