Management
6.5 Performance Management
6.5.1 General
MINI-LINK TN R3 supports performance management according to ITU-T
recommendation G.826.
The following performance counters are used for the E1 and STM-1 interfaces:
• Errored Seconds (ES)
• Severely Errored Seconds (SES)
• Background Block Error (BBE) (only structured interfaces)
• Unavailable Seconds (UAS)
• Elapsed Time
The performance counters above are available for both 15 minutes and 24
hours intervals. The start time of a 24 hours interval is configurable.
The following counters are stored in the NE:
• Current 15 minutes and the previous 96x15 minutes
• Current 24 hours and the previous 24 hours
Specific information on performance management is also available as listed
below:
• Performance counters for Ethernet traffic are described in Section 3.6.2
on page 33.
• Performance data for the Radio Terminal is described in Section 4.8 on
page 92.
Performance data is stored in a volatile memory, so that a restart will lose
all gathered data.
6.5.2 Bit Error Testing
Each NE has a built-in Bit Error Ratio Tester (BERT) in all plug-in units
carrying traffic. The BERT is used for measuring performance on E1 interfaces
according to ITU standard O.151. A Pseudo Random Bit Sequence (PRBS)
with a test pattern 2
15
–1 is sent through the selected interface.
As with loop tests, bit error testing may be used for system verification or for
fault location.
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