JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
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Using E1 Analyzer
Measurement example
Figure 271 E1 transmission monitoring for framing PCM30
NOTE
Bit Error is not supported for the framing type PCM30.
Performing BERT testing
There are three RX modes available for the BERT testing.
 Terminate Mode: The Terminate mode is used when you wish to send and receive an E1
signal. The instrument terminates the received signal with a low impedance termination, and
requires that the circuit be disrupted for testing.
 Bridge Mode: The Bridge mode is similar to the monitor mode. However, in the Bridge mode,
the instrument applies high impedance isolation resistors to the circuit under test. This
isolation circuitry will protect the signal from any possible disruption. There is no need to plug
into the TX jack of the test set while in the Bridge mode, and there is no need to specify a test
pattern to be transmitted. However, the transmitter in the test set is sending the selected test
pattern, framing, coding, and CRC.
 Monitor Mode: The Monitor (protected monitoring point) mode is used when a monitor access
is to be made. The network element has isolated the MON signal from the live signal with high
impedance resistors. It is useful that it protects the live signal from any possible disruptions
caused by the testing process.
Making a test
Procedure
To select the measurement mode:
1.
Press the MODE hard key.
2.
Press the E1/T1 Analyzer soft key.