Appendix B: Performance Monitor
127
November 2001
The ETU-01A includes a performance monitor feature. The contents
of the monitor may be viewed via the front panel LCD, through a terminal
connected to the control port or via optional SNMP.
General
This section describes the performance evaluation and monitoring
functions provided by the ETU-01A for the E1 link.
The functions actually available depend on the state of the CRC-4
function:
• CRC-4 Enabled: when the CRC-4 function enabled is used, it is
possible to monitor the end-to-end data transmission performance.
The error detection information is derive from the data payload, by
performing a cyclic redundancy check (CRC). The resulting CRC
checksum is transmitted in addition to the raw data bits. The
receiving end recalculates the checksum and compares the results
with the received checksum. Any difference between the two
checksums indicates that one or more bit errors are contained in the
current data block being evaluated.
• CRC-4 Disabled: in this case, the ETU-01A does not support the
capabilities listed above. However, the ETU-01A now becomes
capable of providing statistics for bipolar violations (BPV).
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