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9-9
Clock Recovery Commands
RDIVider
RDIVider
Command
(83496A Opt. 300)
:CRECovery{1 | 3}:RDIVider <divide_ratio>
This 83496A Option 300 command sets or queries the data-rate divide ratio. This value is
used to compute loop bandwidth when in the rate-dependent loop bandwidth mode. Refer to
the RDIVider argument of the command “LBWMode” on page 9-6. The default value is 5000.
Restrictions 83496A Option 300 modules. Software revision A.04.20 and above.
Example 10 OUTPUT 707; ":CRECOVERY1:RDIVIDER 4"
Query :CRECovery{1 | 3}:RDIVider?
Returned Format [:CRECovery{1 | 3}:RDIVider] <divide_ratio><NL>
RELock
Command
(83496A)
:CRECovery{1 | 3}:RELock
This 83496A command locks an 83496A module to the data rate. Issue this command to lock
the module whenever changes occur in the data rate or input data source. Under two condi-
tions, the module may lock on a data rate other than the specified rate. In the first condition,
lock can occur if the entered data rate is an integer of the actual data rate of the signal. The
second condition occurs because the acquisition range is broad (greater than
±5000 PPM.
This makes it possible for the module to lock on a signal that is higher or lower than the
selected value. For example, if you select a 2.48832 Gb/s data rate but the signal is actually
2.5 Gb/s, the module may still lock on the signal.
If an 83496A module is locked, sending the RELock command does not set the Clock Recov-
ery Event Register’s UNLK bit (bit 0) or LOCK bit (bit 1). Refer to “Clock Recovery Event
Register (CRER)” on page 1-20. To determine if the RELock command has completed, use
the CRECovery:LOCKed? query.
Restrictions 83496A modules. Software revision A.04.20 and above.
Example 10 OUTPUT 707; ":CRECOVERY1:RELock"
SPResent?
Query
(83492/3/4A)
:CRECovery{1 | 3}:SPResent? {RECeiver1 | RECeiver2}
This query returns the status of whether the specified receiver detects an optical signal (Sig-
nal PResent). RECeiver2 is used for long wavelengths and RECeiver1 is used for short wave-
lengths. For electrical clock recovery modules (83491A), the signal present flags will always
return false. This query does not apply to 83495A or 83496A modules. Refer to Table 9-5 on
page 9-10.
Returned Format [:CRECovery{1 | 3}:SPResent] {RECeiver1 | RECeiver2}, {1 | 0}<NL>
Example 10 OUTPUT 707;":CRECOVERY3:SPRESENT? RECEIVER2"