Appendix A
Test Results Definitions
DS1 results
140
CT-650 Command-Line Reference Guide
Release 9.4
G.821
The following fields appear in the G.821 category of the DS1 test
results screens.
CRC Error
Rate
Ratio of CRC errors to the number of superframes (24
T1 frames) received.
CRC Sev Err
Sec
Number of seconds during which the total number of
CRC errors and frame synchronization losses equaled
320 or more.
Field
Description
Field
Description
Error Free
Sec
Number of seconds during which pattern synchroniza-
tion is maintained through the entire second and no bit
error occurred.
Severely
Errored Sec
Number of seconds during which the bit error ratio
was greater than 10
-
3
since the test started.
Degraded
Minutes
Number of minutes during which the bit error ratio is
greater than 10
-6
and less than 10
-3
.
Available
Sec
Number of elapsed seconds since pattern synchroni-
zation for which the bit error rate is less than 10
-3
.
Unavail-
able Sec
Count of elapsed seconds since pattern synchroniza-
tion in which the bit error rate is greater than or equal
to 10
-3
.
% Error
Free Sec
Ratio, expressed as a percentage, of error-free sec-
onds to the total number of seconds since pattern syn-
chronization.
Summary of Contents for CT-650
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