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TimeHub 5500 TL1 Reference Manual
Performance Monitoring
097-55501-02 Issue 5: June 2003
SSSSSSSSSSS SSSS S SSSSS SSSSSSS S SSS S SSSSS S
4
Frequency Spread (cont’d)
Table F lists SPRD measurements and the measurement time period for an input
port.
Command Example:
RTRV-PM::CLK:SC1::SPRD;
The command in this example displays SPRD information about the input ports on
the active clock card.
Table F. SPRD Measurements and Time Periods for All Input Ports
Measurement
Averaging Time
First Data
Available
After: Updated Every:
Includes Data
from Last:
SPRD-3S See Note 1 See Note 1 See Note 1
SPRD-12S See Note 1 See Note 1 See Note 1
SPRD-48S See Note 1 See Note 1 See Note 1
SPRD-192S See Note 1 See Note 1 See Note 1
SPRD-768S See Note 2 See Note 2 See Note 2
SPRD-3072S See Note 2 See Note 2 See Note 2
Note 1: Because SPRD depends on FFOFF measurements from
multiple ports, and these FFOFF values may be updated at
different times, SPRD measurements are not updated as
regularly as the other measurements. For averaging times of
3 seconds, 12 seconds, 48 seconds, and 192 seconds. SPRD
will be updated approximately once per minute.
Note 2: For longer averaging times, SPRD will be updated when
new FFOFF values become available, provided at least 1
minute has elapsed since the last update (in some cases the
updates may occur more often).
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