ADC HiGain H2TU-C-202 Manual page 27

LTPH-TP-1005-02, Issue 2
H2TU-C Equalization (EQL) Option. Equalization is the configuration of system transmission characteristics
within specified limits. An adaptive equalizer inserts a frequency-shaped loss that corresponds to an equivalent
addition of an appropriate cable length. By simulating the additional cable loss necessary for correct operation,
the equalizer compensates for a range of variation in transmission path characteristics.
Alarm Pattern (ALMP) Option. To improve HiGain HDSL2 compatibility with the switch-to-protect features
used in Digital Loop Carrier (DLC) feeder applications, the H2TU-C-202 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-202 improves compatibility with Digital
Loop Carrier (DLC) feeder applications because of its ability to transmit T1 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-202
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.
The BPV count is converted into BPVs at the distant end during the following second at a rate of 1 BPV every
128 T1 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.
H2TU-R DS1 Frame Conversion (CONV) Option. Frame format conversion is only applicable to the
remote H2TU-R, but selectable by the H2TU-C or H2TU-R. This option enables the network to be ESF, which is
used to embed SPRM or NPRM into the datalink towards the network. During conversion, frame bit errors are
regenerated to ensure transparency.
The HDSL2 system attempts to find ESF or SF framing or determines that no framing exists. The DS1 framing is
then synchronized with the HDSL2 frame. If the framing is lost, the system generates an Out-of-Frame (OOF)
defect which results in Unavailable Seconds-Path (UAS-P). As a result, the system reverts to frame search mode.
H2TU-C-202 List 3E
-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)
ES-L, ES-P, PRM, PDVS-L
SES-L, SES-P
UAS-P, UAS-L
February 28, 2001
-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
648
100
10
Provisioning
19