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LTPH-UM-1109-01, Issue 1 Provisioning
H2TU-C-231 List 2 January 9, 2002 21
DS1 BER (DBER) Option. The DS1 BER alarm occurs when any of the DS1 or DSX-1 performance
monitoring parameters listed in Table 7 exceed the counts shown for the 24-hour period between 12:00:00 AM
through 11:59:59 PM. These thresholds correspond to a 10
-6
BER. All PM counters clear to zero at 12:00:00 AM
or when Master Clear is selected.
HDSL2 BER Threshold (HBER) Option. The HBER option permits the monitoring of loop integrity and
reporting of alarms when excessive errors are detected. The PM primitive used for this purpose is the CRC
checksum performed on the HDSL2 frame for both directions of transmission. It is, therefore, called a block error
rate rather than the bit error rate associated with the DS1 interface. The CRC errors and counts are displayed on
the Monitor screen for both the H2TU-C and H2TU-R. The HBER option allows an alarm to be generated if the
total number of CRCs at either the H2TU-C or H2TU-R exceeds the selected BER threshold during the last
1-minute interval.
• HBER option = 1E-6. Alarm is generated if CRC > 93
• HBER option = 1E-7. Alarm is generated if CRC > 9
Once initiated, the HBER alarm clears when the CRC count drops below the selected threshold. Selecting NONE
inhibits this alarm.
Table 7. DS1/DSX-1 24-Hour PM Threshold
Parameter Threshold Count
CV-L (BPV) 133,400
ES-L, ES-P, PRM-NE, PRM-FE 648
SES-L, SES-P 100
UAS-P, UAS-L 10