PairGain 150-1111-75, Руководство пользователя

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150-231-175-01, Revision 01 Maintenance
HLU-231 List 7E September 23, 1998 23
Ground Fault Detect
The HLU-231 List 7E has a GFD circuit that is compliant with paragraph R7-1, Section 7.2.1 of GR-1089-CORE,
Issue 1, Revision 1, December, 1996.
The GFD circuit immediately detects ground faults that occur at any point along any span on any conductor, and
shuts down the HiGain circuit. The HLU-231 then applies power periodically to the first span to detect the ground
fault condition. This power cycling and ground fault protection continues as long as the fault condition exists.
System Settings Screen Options
Table 9 describes the System Settings screen options and their counterpart codes for the front panel display.
Table 9. HLU-231 List 7E System Settings Screen Options
System Settings
Screen Options
Front Panel
Display
Code
Selection Description
Equalization EQL EXT* Removes the Internal Equalizer which is replaced by an External Equalizer.
0 Sets the Equalizer to DSX-1 for 0 to 133 feet.
133 Sets the Equalizer to DSX-1 for 133 to 266 feet.
266 Sets the Equalizer to DSX-1 for 266 to 399 feet.
399 Sets the Equalizer to DSX-1 for 399 to 533 feet.
533 Sets the Equalizer to DSX-1 for 533 to 655 feet.
SmartJack Loopback LBPK DIS Configures the HiGain system to ignore all in-band SmartJack loopback
commands.
ENA* Enables the HiGain system to recognize all in-band SmartJack loopback
commands.
Special Loopback SPLB GNLB* Configures the HiGain system to respond to the generic (3- or 4-in-7) in-band
loopback codes.
A1LB and
A2LB Configures the HiGain system to respond to the in-band loopback codes of the
Teltrend addressable repeater.
A3LB Configures the HiGain system to respond to the in-band loopback codes of the
Wescom addressable repeater.
A4LB Configures the HiGain system to respond to the in-band loopback codes of the
Wescom Mod 1 addressable repeater.
A5LB Configures the HiGain system to respond to the in-band loopback codes of the
Teltrend Mod 1 addressable repeater.
Power PWRF DIS Disables powering to the HDSL pair.
ENA* Allows the HDSL line voltage to automatically switch between -140V
maximum for non-doubler applications and
±
100V for doubler applications.
*Indicates factory default settings.