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9-3
Clock Recovery Commands
fixed. For the external output, the loop bandwidth is 4 to 5 MHz. On 83491/2/3A modules, the
internal triggering loop bandwith is 50 to 70 kHz; on 83494A modules, it is 90 kHz. For 83492/
3/4A modules, use the SPResent to check if an optical signal is detected by the module.
83495A Module Agilent 83495A modules provide both optical and electrical clock recovery for all rates from
9.953 Gb/s to 11.32 Gb/s. Use the INPut command to select the optical or electrical input. Use
the RATE command to select the module’s data rate. On Option 200 modules, you can select
a continuous rate range between 9.953 Gb/s to 11.32 Gb/s. The module will lock on any valid
signal within this range. As with 83492/3/4A modules, this module automatically locks on the
input signal, provided that the module is set to the correct data rate. Use the LOCKed? query
to determine if the module is locked on the signal. Unlike 83492/3/4A modules, the SPResent
command can not be used to check if an optical signal is detected. Use the LBANdwidth com-
mand to select from two loop bandwidth settings: 300 kHz and 4 MHz.
83496A Module Agilent 83496A modules provide both optical and electrical clock recovery selected by the
INPut command. The 83496A module provides continuous, unbanded tuning from 50 Mb/s to
7.10 Gb/s (13.5 Gb/s, Option 200). Specify the data rate with the CRATe command rather
than the RATE command as with other modules. Although the module accepts the RATE
command for compatibilty with existing programs, it is recommended that you use the
CRATe command. Unlike 83492/3/4A modules, the SPResent command can not be used to
check if an optical signal is detected.
Because this module does not provide automatic locking, you must issue the LOCK command
to establish lock and to reestablish lock whenever a setup parameters change (for example
input port or trigger on data), the data rate changes, or the signal parameters change (for
example, edge density). Use the LOCKed? query to determine if the module is locked on the
signal. If the module looses lock, the trigger becomes asynchronous with the data and the
instrument will not display a correctly triggered waveform. Use the TDENsity query to return
the edge density of the data signal.
Standard 83496A modules have two loop bandwidth settings that are selected using the
LBANdwidth command. The low bandwidth setting is 30 kHz (< 1 Gb/s data rate) or 270 kHz
(
≥1 Gb/s data rate). The high bandwidth setting is 1500 kHz. On Option 300 modules, you can
specify any loop bandwidth between the range of 30 kHz to 10 MHz using the CLBandwidth
command. Or, on Option 300 modules, use the LBWMode command to configure the module
to automatically select the loop bandwidth based on data rate and data-rate divide ratio (RDI-
Vider command).
Use the ODRatio and ODRatio:AUTO commands to specify the divide ratio that is applied to
the module’s front-panel Recovered Clock Output.