Symmetricom TimeHub 5500 Reference Guide

Performance Monitoring
Measurements
160 TimeHub 5500 TL1 Reference Guide 097-55501-02 Issue 7 – January, 2005
Command Example:
RTRV-PM::CLK-4:SC1::TDEV;
The response to the command in this example displays TDEV information about
input port 4.
Response Example:
SYMMBITS 04-06-15 12:07:38
M SC1 COMPLD
"CLK1-4:TDEV-1S,2.000000,COMPL"
"CLK1-4:TDEV-4S,2.000000,COMPL"
"CLK1-4:TDEV-16S,2.000000,COMPL"
"CLK1-4:TDEV-64S,2.000000,COMPL"
"CLK1-4:TDEV-256S,NA,NA"
"CLK1-4:TDEV-1024S,NA,NA"
;
The response in this example shows TDEV values calculated for averaging times of
1 seconds, 4 seconds, 16 seconds, and 64 seconds for input port 4 of Clock card 1.
The values for averaging times of 256 seconds and 1024 seconds are not yet
available, but do become available as the system collects data.
Time Interval Error
This measurement is displayed in nanoseconds and measures an input port’s Time
Interval Error (TIE) over specific observation time intervals. TIE is based on the net
phase deviation over an interval of time. It is calculated by taking the phase
deviation of the final sample in a block of data and subtracting the phase deviation
of the final sample in the previous block of data.
LMRTIE values from 1 second to 24 hour observation times are available every
15 minutes. The 1 second data is available after 1 second and is updated each
second.
For example, a 1 minute TIE measurement is the difference in the phase deviation
between two samples 1 minute apart. Similarly, a 1 second TIE measurement is the
difference between phase deviation samples captured 1 second apart.
TDEV-256S 25088 s 1536 s 25088 s
TDEV-1024S 100352 s 3072 s 100532 s
Table 4-5 TDEV Measurements and Time Periods for Single Input Port (Continued)
Measurement
Averaging Time
First Data
Available After
Updated Every
Includes Data
from Last

Symmetricom TimeHub 5500 Specifications

General

Brand	Symmetricom
Model	TimeHub 5500
Category	Data Loggers
Language	English