ADC HiGain H2TU-C-231 List 3F User Manual page 27

LTPH-UM-1149-01
Table 6. H2TU-C-231 List 3F ADC Config Menu Options (Continued)
Front-Panel
ADC Config
Display
Menu Options
Code
H2TU-R DS1 Frame CONV
Conversion
See "H2TU-R DS1
Frame Conversion
(CONV) Option" on
page 20.
HDSL2 Block Error Rate 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 CRC errors at either the H2TU-C or H2TU-R exceeds the selected HBER
threshold during the last 1-minute interval.
•
HBER option = 1E-6. Alarm is generated if CRC errors > 93
•
HBER option = 1E-7. Alarm is generated if CRC errors > 9
Once initiated, the HBER count clears when the CRC error 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 HiGain system.
Equalization (EQL) Option. The equalizer option causes the DS1 output signal of the H2TU-C to conform to
a specific pulse template when it arrives at the DSX-1 cross-connect point. The degree of pulse-shaping required
is a function of the distance between the H2TU-C's equipment bay and the DSX-1 panel. Thus, the equalizer has
six discrete settings, in increments of 133 feet to cause the maximized separation of 655 feet.
Alarm Pattern (ALMP) Option. To improve HDSL2 compatibility with the switch-to-protect features used in
Digital Loop Carrier (DLC) feeder applications, the H2TU-C has an Alarm Pattern (ALMP) option that allows
you to select either an AIS or LOS DS1 output payload for the following alarms:
• LOSW on any loop
•
LOS DS1
Bipolar Violation Transparency (BPVT) Option. The H2TU-C improves compatibility with Digital Loop
Carrier (DLC) feeder applications because of its ability to transmit DS1 BPV occurrences between its DS1
interfaces. This feature is required to support protection switching in DLC applications. Each DLC terminal must
be able to monitor the integrity of its Receive DS1 payload and then switch to the protect line when the integrity
of the path drops below specific user selected limits.
An essential requirement of this feature is the need for each DLC terminal to detect BPVs in its DS1 input.
Standard HDSL systems correct DS1 BPVs at the input and therefore prevent them from being detected by the
DLC terminals to which they are connected. The H2TU-C and its associated remote units remove this limitation
and become 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.
H2TU-C-231 List 3F
Selection Description
OFF Framing functionally determined by the framing option. Frame format
conversion is inhibited at the H2TU-R.
ACON Auto (ACON) detection of framing and potential frame conversion at the remote.
FCON Auto detection of framing and forced frame format conversion (FCON) at the
H2TU-R.
June 12, 2002
Provisioning
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