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9-2
Clock Recovery Commands
Clock Recovery Commands
The Clock RECovery (CREC) subsystem commands control the clock recovery modules. This
includes setting data rates, as well as querying locked status and signal present conditions.
Refer to Table 9-1 for a listing of which subsystem commands work with each module. Refer
to Table 9-2 on page 9-4 for a listing of available data rates for each module.
83491/2/3/4
Modules
Agilent 83491A modules have electrical inputs, 83492A have multimode optical inputs, and
83493A and 83494A modules have single-mode optical inputs. Each of these modules recov-
ers clock signals at specific rates as listed in Table 9-2. Use the RATE command to select the
module’s data rate so that it matches the input signal. All of these modules automatically lock
on input signals, provided that they are set to the correct data rate. Use the LOCKed? query
to determine if the module is locked on the signal. The loop bandwidth for each module is
Table 9-1. Command Compatibility with Module
Command
83491A
83492A
83493A
83494A
83495A
83496A
83496A
Option 300
CLBandwidth
•
CRATe
••
INPut
•••
LBANdwidth
••
•
α
a. CONTinuous query only.
LBWMode
•
LOCKed?
•••• • • •
ODRatio
••
ODRatio:AUTO
••
RATE
••••
•
β
b. For backwards compatibility. In new programs, use CRATe instead.
•
b
RDIVider
•
RELock
••
SPResent?
••••
TDENsity?
••