Pass/Fail result is in conjunction with path allocation between 0.1 and 100%
Note:
ITU-T G.821 evaluates bit errors, therefore, facilities for evaluating block errors are disabled. G.821 relies on the evaluation
of bit errors, thus the test channel must be taken out of service to perform the measurement
.
Definitions:
Errored Second (ES):
A one-second time interval in which one or more bit errors occur.
Severely Errored Second (SES):
A one-second interval in which the bit error ratio exceeds 10
-3
.
Unavailable Second (UAS):
A circuit is considered to be unavailable from the first of at least ten consecutive SES. The
circuit is available from the first of at least ten consecutive seconds which are not SES.
Available Second (AS):
A one-second time interval in which no bit errors occur.
Errored Free Second (EFS):
A one-second time interval in AS during which no errors and no pattern slips have been
detected.
G.826 Analysis
Evaluation According to ITU-T G.826
G.826 recommendation makes provision for higher bit rates and allows in-service measurement using the evaluation of block
errors.
The following are evaluated: ES, SES, BE, BBE, and UAS.
Pass/Fail result depends on path allocation of 0.1 to 100%.
In-Service Measurement (ISM):
Simultaneous in-service measurement of “near end” and “far-end” of a selected path.
Out-of-Service Measurement (OOS):
Out-of-service measurement using bit errors in a test pattern.
Definitions:
Errored Second (ES):
A one-second time interval containing one or more errored blocks.
Severely Errored Second (SES):
A one-second time interval in which more than 30% of the blocks are errored
Block Error (BE):
A block containing one or more errored bits.
Background Block Error (BBE):
An errored block that is not a SES.
Unavailable Second (UAS):
A circuit is considered to be unavailable from the first of at least ten consecutive SES. The
circuit is available from the first of at least ten consecutive seconds which are not SES.
Note:
The recommended measurement time for G.821 and G.826 is 30 days.
Evaluation According to ITU-T G.828
G.828 provides a precise block length for each bit rate as opposed to G.826.
ES, SES, BBE, UAS and SEP are evaluated.
Pass/Fail result is in conjunction with path allocation between 0.1 and 100%.
RXT-3900 e-Manual D07-00-111P Rev A00
Содержание RXT3900
Страница 1: ...RXT 3900 e Manual D07 00 111P Rev A00...
Страница 19: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 35: ...Tx Structure Setup Graphical Mode Tx Payload Setup Tx Pattern Setup RXT 3900 e Manual D07 00 111P Rev A00...
Страница 50: ...RXT 3900 e Manual D07 00 111P Rev A00...
Страница 74: ...RXT 3900 e Manual D07 00 111P Rev A00...
Страница 75: ...RXT 3900 e Manual D07 00 111P Rev A00...
Страница 119: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 240: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 282: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 294: ...Go back to top Go back to TOC 13 15 IP Monitoring RXT 3900 e Manual D07 00 111P Rev A00...
Страница 296: ...Net Wiz Trace Route Setup Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 363: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...
Страница 377: ...Go back to top Go back to TOC RXT 3900 e Manual D07 00 111P Rev A00...