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LTPH-UM-1122-02, Issue 2
Power Back Off (PBON and PBOC) Options. Power Back Off Network (PBON) and Power Back Off
Customer (PBOC) allow the HDSL4 circuit to support two transmit power templates: default (DEF), higher level,
and enhanced (ENH), lower level. These are defined in the four-wire section of the ANSI T1.418 Issue 2 HDSL4
standard. Each HDSL4 receiver detects the level it is receiving during the start-up, pre-activation sequence. It then
compares this level to the level it should be receiving according to the PBON and PBOC option settings (DEF or
ENH). If the received level is outside the template limits, the receiver sends a message to the upstream HDSL4
transmitter requesting the proper level. These levels are adjusted only during the start-up routine or if the PBON
or PBOC option settings are changed during normal operation. Since the ENH template levels are up to 15 dBm
below those of the DEF template, the ENH setting can be used to reduce crosstalk levels into adjacent circuits.
(For example, if crosstalk noise is being induced by the H4TU-R, set the PBOC option to its lower (ENH) level
setting. Conversely, if the HDSL4 signal at the H4TU-R is being affected by crosstalk noise induced from adjacent
pairs, set the PBOC option to its higher (DEF) level setting.
Changing these Power Back Off option settings on a live circuit causes the HDSL4 loop to
momentarily drop and then reacquire synchronization. This setting can also affect the operating
margins.
Resetting to Factory Defaults
Resetting the H4TU-C-388 List 1 to its original factory settings may cause interruption of
service.
To reset the H4TU-C-388 List 1 to its original factory defaults:
C
1
Press
to select the Config menu.
2
Use the
↑
and
↓
Y
3
Press
if you are certain you want to reset the H4TU-C, or press
Monitor
Performance
SETTING FACTORY DEFAULTS..SERVICE MAY BE INTERRUPTED! ARE YOU SURE (Y/N)?
ID: xxxx--xxxx--xxxx--xxxx
H4TU-C-388 List 1
arrow keys to select Set Factory Defaults, then press
Event Log
Config
+-----------------------+
| Standard Options
| ADC Options
| BERT Generator
| Date and Time
| Master Clear
|
Set Factory Defaults
+-----------------------+
01/04/2002
Figure 9. Configuration Menu - Reset to Factory Defaults
September 12, 2003
ENTER
N
to cancel this action.
Inventory
Report
Rlogout
-> |
-> |
-> |
-> |
|
|
12:09:55
H4TU-C
Provisioning
.
Help
System: OK
23
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