JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
Using T1 Analyzer
535
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2e23: A pseudorandom pattern based on a 23 bit shift register.
–
2e15: A pseudorandom pattern based on a 15 bit shift register.
–
2e23 INV: Bit inversed pseudorandom pattern based on a 23 bit shift register.
–
2e15 INV: Bit inversed pseudorandom pattern based on a 15 bit shift register.
6.
Toggle the TX Clock soft key between Internal and RX and select the timing source option to
measure frequency and timing:
–
Internal: Internal clock uses an internal oscillator in case of external reference is not
available and the instrument does not transmit signal to synchronized equipment. The
instrument provides the clock to the unit under test and most cases in Loopback test mode.
–
RX: Transmit clock uses the frequency recovered from the received signal (Network Loop),
if accurate frequency measurement is required.
7.
Press the TX LBO soft key, and then select the level for TX Line Build Out option from the
following choices:
–
0 dB: Is used in most cases including that the test set is connected to the DSX front panel,
to CSU, to NIU or Channel Bank or that the cabling is less than about 130 feet in-between
test set and DSX.
–
-7.5 dB: Is used in cases that attenuation is needed where the T1 line is series connected
to 7.5 dB attenuator.
–
-15 dB: Is used in cases that attenuation is needed where the T1 line is series connected to
15 dB attenuator.
8.
Press the Loop Codes soft key, and then do one of the following option:
–
To select the link option, toggle press the Link soft key between Inband and Datalink .
Datalink is used when the framing is set to ESF.
–
To select the Channel Service Unit, press the CSU soft key.
–
To select the Network Interface Unit, press the NIU soft key.
To start or stop testing:
1.
Press the MEASURE hot key.
2.
Press the Loop Test soft key, and then select the testing option as needed: Start , Stop , or
Clear .
To activate or deactiave the external loop back:
1.
Press the Remote Loop Up to activate the external loop back so that the instrument sends the
system a request of the loop back mode.
2.
Press the Remote Loop Dn to deactivate the external loop back so that the instrument sends
the system a request to clean the loop back mode.
To activate or deactiave the internal loop back:
1.
Press the Self Loop Up to activate the internal loop back.
2.
Press the Self Loop Dn to deactivate the internal loop back, reverting the instrument to a
through mode.
To select the error injection type:
1.
Press the Error Injection soft key, and then select the error injection type: None , 1E-3 , 1E-4 ,
1E-5 , or Single .
To set the error injection optios:
1.
Press the Alarm Injection soft key.
2.
Toggle the AIS Alarm soft key between On and Off to enable or disable the Alarm Indication
Signal.