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9-6
Clock Recovery Commands
LBWMode
Returned Format [:CRECovery{1 | 3}:LBANdwidth] {BW270KHZ | BW300KHZ | BW1500KHZ | BW4MHZ | CONTinuous}<NL>
LBWMode
Command
(83496A Opt. 300)
:CRECovery{1 | 3}:LBWMode {FIXed | RDEPendent}
This 83496A Option 300 command sets or queries an 83496A Option 300 module’s loop band-
width entry mode. When FIXed is specified, the loop bandwidth value can be entered using
the CLBandwidth command. When RDEPendent (rate dependent) is specified, the loop
bandwidth is indirectly set by the data rate and the data-rate divide ratio (RDIVider com-
mand). The loop bandwidth can not be entered when the module is in the RDEPendent
mode.
Restrictions 83496A modules. Software revision A.04.20 and above.
Example 10 OUTPUT 707;":CRECOVERY1:LBWMODE FIXED"
Query :CRECovery{1 | 3}:LBWMode?
Returned Format [:CRECovery{1 | 3}:LBWMode] {FIXed | RDEPendent}<NL>
LOCKed?
Query
(83491/2/3/4/5/6A)
:CRECovery{1 | 3}:LOCKed?
The query returns the locked status of the clock recovery module. Locked status returns 1,
unlocked status returns 0. When a clock rate is selected on 83491/2/3/4/5A modules,
unlocked status indicates that clock recovery cannot be established and trigger output to the
mainframe is disabled. In bypass mode (trigger on data), status is always 0 and trigger output
to the mainframe is not disabled. For 83495A modules, status is still locked or unlocked
depending on clock recovery state. For 83496A modules, the trigger output to the mainframe
is not disabled when an unlocked condition exists.
Returned Format [:CRECovery{1 | 3}:LOCK] {1 | 0}<NL>
Table 9-3. Valid Loop Bandwidth Arguments Versus Modules
Arguments
a
a. The ✺ symbol indicates the default data rate.
83495A 83496A
83496A
(Not Opt. 300)
BW270KHZ
✺
b
b. Default and only selection for data rates below 1 Gb/s.
✺
BW300KHZ
✺ •
BW1500KHZ
✺
c
c. Default ≥1 Gb/s. Unavailable for data rates below 1 Gb/s.
•
BW4MHZ
••
CONTinuous
d
d. The CONTinuous argument is returned in queries and can not be used to set the band-
width.