ADC H2TU-C-202 User Manual page 28

Provisioning
BPV transparent by detecting and counting input BPVs at each end and then by replicating them at the DS1 output
port of the distant end.
The BPV count is converted into BPVs at the distant end during the following second at a rate of 1 BPV every
128 DS1 bits up to a maximum of 12000 (BER=7.7 x 10
exceeds the maximum 10
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 (HBER) Threshold 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.
RAI to RAI-CI toward NET (RACI). The H2TU-C-202 in conjunction with the H2TU-R-402 List 4F supports
the RAI-CI function.
The RAI-CI signal is a RAI signal which contains a signature indicating that an LOF or AIS failure has occurred
in the customer installation (CI) at the H2TU-R unit and that the defect or failure which caused the origination of
that RAI is not found in the signal from the network. Therefore, RAI-CI is transmitted toward the network when
the following two conditions are simultaneously true at the point from which RAI-CI originated (at the H2TU-R,
toward the network):
•
RAI is received from the CI.
•
No LOF, LOS, or AIS failure is detected in the signal received from the network.
Sending RAI-CI terminates within 500 µs when either of the following occurs:
• Cessation of RAI from the CI.
• Declaration of LOF, LOS, or AIS in the signal from the network.
To prevent the transmission of RAI-CI during the failure-clearing interval of a network failure, the transition from
RAI to RAI-CI is delayed for 20 seconds following the detection of conditions 1 and 2 above. Since RAI-CI meets
20
-3 BER required by most DLC systems.
Table 7 exceed the counts shown for the 24-hour period between 12:00:00 AM
Table 7. DS1/DSX-1 24-Hour PM Threshold
Parameter
CV-L (BPV)
CV-P (CRC)
ES-L, ES-P, PRM-NE PRM-FE
SES-L, SES-P
UAS-P, UAS-L
October 25, 2002
-3 ). This maximum rate is more than adequate since it
-6
BER. All PM counters clear to zero at 12:00:00 AM
Threshold Count
133,400
132,960
648
100
10
LTPH-UM-1072-03
H2TU-C-202 List 2F