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HCD-E1 Installation & Operation Manual Chapter 5 - Troubleshooting and Diagnostics
01/01/01 08:15 Performance Diagnostics Data 5-13
5.3 Performance Diagnostics Data
General
HCD-E1 has two capabilities for collection of performance statistics: E1 and
HDSL performance monitoring capability.
This section first describes the principles and parameters of the E1 and
HDSL performance monitoring and then explains how to display
performance data from the HCD-E1 front panel. For information on
displaying the performance data from the control terminal, see Chapter 4.
E1 Sublink
Performance
Monitoring
This section describes the performance evaluation and monitoring functions
provided by HCD-E1 with respect to the user's traffic (on the E1 link
between the DTE and the user’s port). The functions actually available
depend on the use of the CRC-4 function: whether it is enabled or disabled.
Below are listed performance monitoring parameters with the CRC-4
function enabled and disabled, followed by a summary table (Table 5-2)
listing the displays of all these parameters on the HCD-E1 front panel in the
order of their appearance, accompanied by a short description and ranges
available.
E1 Performance Monitoring with CRC-4 Function Enabled
When the CRC-4 function is enabled, you are able to monitor the
end-to-end data transmission performance. HCD-E1 derives information
about errors from the E1 data payload by performing a cyclic redundancy
check (CRC), and transmits the resulting CRC checksum 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 the current data block being evaluated contains bit errors.
When the CRC-4 function is enabled, HCD-E1 stores E1 line statistics for the
E1 port. This permits real-time monitoring of E1 data transmission
performance.
The performance monitoring parameters are listed below:
•
Current CRC-4 error events (ERROR CRC)
A CRC-4 error event is any multiframe containing a CRC error and/or
OOF event. The number of CRC events in the current second is collected
in a current CRC error events register.
•
Current average CRC-4 errors (AV ERR CRC)
The average number of CRC events per second. The average is updated
every second.
Note
You can display the register contents at any time. When the CRC error events
are displayed on the front-panel LCD, you can reset the register by pressing
ENTER.