ADC H2TU-C-388 HiGain, Руководство пользователя, Страница: 29 / 76

152-388-115-03, Issue 03 Provisioning
H2TU-C-388 List 1E April 21, 2000 21
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 a cable length. By simulating the additional cable loss necessary for correct operation, the equalizer
compensates for a range of variation in transmission path characteristics.
Bipolar Violation Transparency (BPVT) Option.
The H2TU-C-388 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 prevent them from being detected by the DLC terminals to which they are connected. The
H2TU-C-388 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 DS1 bits up to a maximum of 12000 (BER=7.7 x 10
-3
). This maximum rate exceeds the maximum 10
-3
BER
required by most DLC systems.
Performance Report
Messaging PRM SPRM The H2TU-R generates Supplemental PRM (SPRM) every second if no PRM
is received from the CPE within 5 seconds of a reset or if an LOS/AIS/OOF
condition occurs.
Transaction Language 1 (TL1) commands and response are enabled.
NPRM The H2TU-R generates Network PRM (NPRM) if no PRM is present from the
CPE.
If the CPE is sending PRMs, NPRM is generated in addition to the existing
PRM every second. TL1 commands and response are enabled.
S + N The H2TU-R generates an NPRM which is tagged on to an SPRM every
second. The H2TU-R generates SPRM if no PRM is present from the CPE.
If the CPE is sending PRM, the PRM is converted to an SPRM. TL1 commands
and responses are enabled.
OFF ESF Datalink (DL) is completely transparent. No PRMs are generated.
There are no TL1 responses unless the system is first armed by a TL1
command, which enables performance monitoring.
ESF RAI to SF RAI
Overwrite ROVR ENA If the CONV option is set to FCON or ACON, an ESF DS1 payload from the
network with an embedded RAI pattern is converted to an SF-RAI pattern
toward the CI at the H2TU-R.
See “ESF RAI to SF RAI Overwrite
(ROVR) Option” on page 24 .
DIS Prevents conversion to an SF-RAI pattern.
SF RAI to SF RAI-CI
Toward Network RACI ENA Allows a DS1 SF-RAI (yellow alarm) signal received by the H2TU-R to be
converted to an SF-RAI-CI signal toward the network.
See “SF RAI to SF RAI-CI Toward
Network (RACI) Option” on page 24 .
DIS Prevents conversion of the DS1 SF-RAI.
Fractional T1 Mode FT1 ENA Enables system response to DDS latching loopback commands for fractional
T1 applications and enables CPE disconnect or trouble indication.
See Figure 23 on page 45 for LOS/AIS response priorities.
See “Fractional T1 (FT1) Option” on
page 25 .
DIS Disables system response to DDS latching loopback commands for fractional
T1 applications and CPE disconnect or trouble indications.
Table 6. H2TU-C-388 List 1E PairGain Config Screen Options (Cont.)
System Settings
Screen Options
Front-panel
Display
Code
Selection Description