ADC H4TU-C-388-L1 User Manual page 31

LTPH-UM-1122-02, Issue 2
Table 6. H4TU-C-388 List 1 ADC Config Screen Options (Continued)
Screen
ADC Config Menu
Display
Options
Code
DS1 BER DBER
Threshold
See "DS1 Bit Error
Rate (DBER)
Option" on
page 22.
HDSL4 BER HBER
Threshold
(See "HDSL4
Block Error Rate
Threshold (HBER)
Option" on
page 21.)
SmartJack LPBK
Loopback
Remote RDA
Disconnect Alarm
HDSL4 Block Error Rate Threshold (HBER) Option. The HBER option permits monitoring of loop
integrity and reporting of alarms when excessive errors are detected. The performance monitoring (PM) primitive
used for this purpose is the CRC checksum performed on the HDSL4 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 Monitor
screen displays the CRC errors and counts for both the H4TU-C and H4TU-R. The HBER option allows an alarm
to be generated if the total number of CRCs at either the H4TU-C or H4TU-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.
DS1 Line Coding (DS1) Option. The DS1 line code option should always be set to conform to the type of
DS1 service (AMI or B8ZS) being provided by the system. The Auto mode, which can adapt to either AMI or
B8ZS, should only be used in applications that require it (such as when ADC system acts as a standby circuit to
DS1 circuits whose line codes are not known or may be both AMI and B8ZS). This is because the Auto mode
induces one BPV in the DS1 bit stream whenever it switches from AMI to B8ZS. The Auto mode allows both the
H4TU-C and the H4TU-R to set its DS1 output code to that which is being received at the distant end DS1 input.
This forces the input and the output codes in each direction of transmission to be identical.
H4TU-C Equalization (EQL) Option. The equalizer shapes the DS1 output signal of the H4TU-C to conform
to a very specific pulse template when it arrives at the DSX-1 cross-connect point. The degree of pulse-shaping
H4TU-C-388 List 1
Selection Description
ENA Enables the fixed 24-hour DS1 BER threshold.
DIS Prevents the generation of a system alarm due to DS1 BER.
1E-6 System alarm relay contact closes and the Status LED flashes red when the
Block Error Rate (BER) exceeds 10
definition of Bit Error Rate.)
1E-7 System alarm relay contact closes and the Status LED flashes red when BER
exceeds 10
NONE Prevents generation of a system alarm due to BER.
ENA Enables the HDSL4 system to recognize all inband SmartJack (SMJK)
loopback commands.
DIS Configures the HDSL4 system to ignore all inband SmartJack loopback
commands.
ENA Enables a remote DS1 LOS condition at the input to the H4TU-R to generate
an LOS alarm. AIS or LOS (depending on ALMP) is sent towards the network.
DIS Prevents a remote DS1 LOS condition at the input to the H4TU-R from
causing an LOS alarm. The front-panel Status LED still flashes red and the
ALRM RLOS message is displayed, but the alarm relay contacts do not close
and LOS is sent towards the network from the H4TU-C instead of AIS.
September 12, 2003
-6
. (Block Error Rate is based on the
-7
.
Provisioning
21