Appendix B: Performance Monitor
83
May 2011
Appendix B. Performance Monitoring
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.
B.1 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).
B.2 Performance Monitoring
When the CRC-4 function enabled, the ETU-01A stores El line statistics for the E1 link
interface. This permits real-time monitoring of data transmission performance.
The performance parameters statistics are listed below:
Current CRC-4 error events (CRC Cnt)
A CRC-4 error event is any multiframe containing a CRC error event. The number of CRC
events in the current second are collected in the current CRC error events register. The register
is updated every second.
Note Register contents can be displayed at any time from the LCD, a connected console, or via
SNMP. When the CRC error events are displayed on the front-panel LCD, the register can be reset
by pressing ENTER when the RESET menu item is displayed.
When the CRC-4 function is disabled, the ETU-01A will be able to detect bipolar violations
and store them in a register for 1 second.
Bipolar violations (BPV Cnt) count (BPV last second)
The total number of bipolar violations counted in the last second. This
number is updated every second.
The remaining performance monitor data is available whether CRC-4 is enabled or not.
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