097-55501-02 Issue 7 – January, 2005 TimeHub 5500 TL1 Reference Guide 97
Keywords
Keyword Description
To retrieve the BRIDGED setting for input 4, send:
RTRV-SYNC::CLK-4:SC14:::PARAMETER=BRIDGED;
The response is:
SYMMBITS 03-03-24 09:12:12
M SC14 COMPLD
"S1-OUTC-PG1::CBCOMP=100"
;
indicating that input 4 is currently not set for BRIDGED mode.
CBCOMP (Cable Compensation)
This keyword provides a method for compensating Composite Clock (CC) outputs
for cable delays by entering the approximate number of feet of cable from the CC
output to where the signal is being used. The effect of using this setting is to cause
the CC output to be moved earlier in time so that it can arrive at the point of usage
as if the cable transit time is effectively zero. The conversion factor used for this
setting is that one foot of cable has an associated delay of 1.63 nanoseconds.
The compensation amount can be set uniquely for groups of 20 output ports. Ports
1 through 20 can have a single value and ports 21 through 40 can have a different
value. PG1 and PG2 are part of the AID in the TL1 command and define which
group of 20 ports are set.
Each port can be set to either have no compensation or have the amount set by the
CBCOMP setting. See CCDENB (CC Delay), on page 100.
It is also possible to set the CC delay using the CCDEL (CC Delay) keyword.
CCDEL provides a method for making the adjustment based on time (in
nanoseconds) rather than length of cable. CBCOMP and CCDEL are interrelated. If
the value of either keyword is changed, a corresponding change occurs in the value
for the other keyword. The keyword format is:
CBCOMP=<value>
Parameter Value Description
<value> 0 to 6000 feet Cable compensation in amount of feet using
conversion of 1 foot = 1.63 nanoseconds
Note: This feature is available in firmware versions 4209C and later.
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