ADC HiGain H2TU-C-231 Manual page 29

LTPH-TP-1034-01, Issue 1
DS1 BER (DBER) Option. The DS1 BER alarm occurs when any of the DS1 or DSX-1 performance
monitoring parameters listed in
through 11:59:59 PM. These thresholds correspond to a 10
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 count clears when the CRC count drops below the selected threshold. Selecting NONE
inhibits this alarm.
SF-RAI to SF-RAI-CI toward NET (RACI) Option. In general, the Remote Alarm Indication - Customer
Installation (RAI-CI) signal is an RAI signal which contains a signature indicating that an LOF or AIS failure has
occurred within the customer's network.
RAI-CI is transmitted toward the network when these two conditions are simultaneously true at the point from
which RAI-CI is originated (at the H2TU-R, towards the network):
• RAI is received from the CI
• No LOF, LOS, or AIS failure is detected in the signal received from the network.
Since RAI-CI meets the definition of RAI, RAI-CI may be detected and used exactly as an RAI.
For ESF, the RAI-CI signal is a repetitive pattern with a period of 1.08 seconds. RAI-CI is formed by sequentially
interleaving 0.99 seconds of the unscheduled message 00000000 11111111 (right-to-left), which represents RAI
in the DL, with 90 milliseconds of the message 00111110 11111111 (right-to-left) to flag the signal as RAI-CI.
For SF, the SF-RAI-CI signal is transmitted in-band by setting each of the 24 channel time slots to 1000 1011
(left-to-right). In addition to the criteria specified above, the generation of SF-RAI-CI has to be held for 1 second
to examine the DS0 channels for the presence of a frame with an all-zeros pattern. If present, the generation of
SF-RAI-CI is suspended for the duration of the all-zeros pattern.
In all SF environments, the H2TU-R automatically converts a CPE DS1 payload with an embedded RAI signal
into an RAI-CI pattern towards the network if the RACI option is enabled (default). Such a conversion affects the
payload as described above. Disable RACI to avoid this conversion.
H2TU-C-231 List 4E
Table 7 exceed the counts shown for the 24-hour period between 12:00:00 AM
Table 7. DS1 and DSX-1 24-Hour PM Threshold
Parameter
CV-L (BPV)
ES-L, ES-P, PRM, PDVS-L
SES-L, SES-P
UAS-P, UAS-L
September 28, 2001
-6
BER. All PM counters clear to zero at 12:00:00 AM
Threshold Count
133,400
648
100
10
Provisioning
21