PairGain HLU-431 User manual

HIGAIN LINE UNIT
QUICK INSTALLATION GUIDE
PAIRGAIN TECHNOLOGIES, INC.
SECTION 350-431-114-01
Revision history of this guide.
Revision 01—January 27, 1998
A) Initial Release
Model List Part Number CLEI Code
HLU-431 1D 150-1504-14 T1L2FKDAAA

Section 350-431-114-01 Revision 01
Page ii HLU-431 List 1D
Table of Contents
Introduction............................................................................1
Compatibility..........................................................................2
Installation..............................................................................3
Card-Edge Connectors......................................................4
Installing the Line Unit ....................................................5
HDSL Line Voltage Option...................................................6
Provisioning............................................................................6
Using the SEL and Mode Front Panel Buttons ................6
Default Settings ................................................................7
Using the Craft port .........................................................7
System Options Settings ..................................................8
Testing...................................................................................11
Alarms ............................................................................11
Loopbacks ......................................................................12
Four-Character Diagnostic Messages ............................14
Specifications........................................................................16
Documentation .....................................................................16
Technical Support................................................................16
Bulletin Board Services ..................................................17
Copyright ©1998 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies, Inc.
and shall not be modified, used, copied, reproduced or disclosed in whole or in part without
the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only
and may be trademarks or registered trademarks of their respective companies.

Revision 01 Section 350-431-114-01
HLU-431 List 1D Page 1
Introduction
The PairGain®HiGain®Line Unit Model HLU-431 List 1D (Part Number
150-1504-14) is the Central Office (CO) side of a repeaterless T1
transmission system and is used in conjunction with the HRU Remote Unit to
provide a complete HiGain High-bit-rate Digital Subscriber Line (HDSL)
system.
ThisguideaddressesHLU-431List 1D operationwhenusedwithandwithout
doublers. For applications without doublers, the HLU-431List 1D is directly
connected to the HRU by the two cable pairs. For doubler applications, one
or two doublers may be used in the HDSL loops between the HLU-431
List 1D and the HRU.
The following figure shows the front panel of the HLU-431 Line Unit
List 1D.

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The HLU-431 List 1D front panel tri-color Status LED has the following
states:
Compatibility
The HLU-431 mounts in the PairGain shelves listed below. The HLU-431
slot pins are shown in the Card-Edge Connectors on page 4.
• HRE-420, Single Slot
•HRE-422,DualSlot
• HRE-427, Seven Slot
• HRE-450, Single Slot Outdoor
•HRE-454, Four Slot Outdoor
Status LED States
State Description
Green Normal Operation.
Flashing Green HDSL Acquisition.
Flashing Red Minor Alarm.
Red FUSE ALRM.
Yellow Self Test in progress or an HLU-431 List 1Dloopback in
effect (CREM) or (NLOC).
Flashing Yellow The HLU-431 List 1Dis in an ARMED (pre-loopback) state.

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HLU-431 List 1D Page 3
Installation
Upon receipt of the equipment, visually inspect it for signs of damage. If the
equipment has been damaged in transit, immediately report the extent of
damage to the transportation company and to PairGain Technologies (see
Technical Support on page 16).

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Card-Edge Connectors
The HLU-431 card-edge connector pinouts are shown below.

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Installing the Line Unit
To install the HLU-431 into a shelf, slide the unit into the shelf card guides
for the desired slot, then push the unit in until it is entirely within the card
guide and the retaining latch locks into place, indicating that the unit is
properly seated:

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HDSL Line Voltage Option
The symmetry of the HDSL line powering voltage can be set by the S2
switch, located on the printed circuit board.
The factory default setting is Unipolar (-). It sets the HDSL line voltage to
0 V on loop 2 and to either -140 V (for non-doubler applications) or -200 V
(for doubler applications) on loop 1.
The Bipolar selection sets the HDSL line voltage to +70 V on loop 2 and
-70 Von loop1, for non-doublerapplications. Doublerapplicationswill have
+100 V on loop 2 and -100 V on loop 1. The symmetry of the HDSL line
powering voltage can be set by the S2 switch, located on the printed circuit
board.
Provisioning
The HLU-431 List 1D contains a non-volatile RAM (NVRAM) which stores
the system option settings. The options are set via buttons on the front panel,
or through the RS-232 interface. They are retained if shelf power is lost or if
the HLU-431 List 1D is unplugged. The System Options table on page 8 lists
the system options for the HLU-431 List 1D.
Using the SEL and Mode Front Panel Buttons
To provision the HLU-431 List 1D through the SEL and MODE front-panel
buttons:
1Press the MODE button for approximately one second. The message
displayedonthe frontpanel alternatesbetween the firstsystemparameter
and its current setting.
2Press the SEL button to step the display through all possible settings (one
at a time) of the parameter being displayed.
3Press the MODE button to select the desired parameter and move to the
next parameter. After you have configured the last parameter, the
display prompts you to confirm the settings.
4Do one of the following:
• Press the SEL button to install the settings.
• Press the MODE button to bypass the settings.
If neither button is pressed in 30 seconds, the settings are bypassed.

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Default Settings
To return the system options back to the original factory default settings:
1Press the SEL button until the DFLT NO message appears.
2Press the SEL button again and DFLT YES displays indicating the
factory default values are now in effect.
To terminate the DFLT mode without setting the factory default values, press
the MODE button or do nothing for 30 seconds.
Using the Craft port
The Craft port, a 9-pin RS-232connector, on the HLU-431 front panel allows
you to use a standard RS-232 cable toconnect your system to adumb terminal
or PC runninga terminal emulationprogram. Once connected youcan access
the maintenance, provisioning, and performance screens.
To provision the HLU-431 through the Craft port:
1Configure the dumb terminal to the following communication settings:
• 1200 to 9600 baud (9600 baud is recommended)
• Parity: NONE
• 8 data bits
•1stopbit
• Hardware Flow Control set to NONE
• VT Terminal Emulation
2Use a serial cable to connect the RS-232 COM port on the dumb terminal
to the HLU-431 front panel Craft port.
If using the Microsoft Windows terminal emulation program,
from the Settings, Terminal Preference menu, deselect
ShowScrollBars and UseFunction , Arrow ,and CtrlKeys for
Windows
.

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3On each screen, enter the key represented by the letter in parenthesis for
the parameter to be changed.
• Each entry of this letter scrolls the parameter to its next value.
• After all selections have been made, press to exit and to con-
firm the changes. This activates the new choices and returns control
to the Main Menu screen.
The following three user options cannot be set from the front panel buttons:
Circuit ID, DS0 Blocking, and Margin Alarm Threshold.
System Options Settings
HLU-431 List 1D System Options
Mode Selection Description
EQL†0* Sets the equalizer to DSX-1 for 0 - 133 feet.
133 Sets the equalizer to DSX-1 for 133 - 266 feet.
266 Sets the equalizer to DSX-1 for 266 - 399 feet.
399 Sets the equalizer to DSX-1 for 399 - 533 feet.
533 Sets the equalizer to DSX-1 for 533 - 655 feet.
ZBTS ON Tells HiGain that the ESF frame is operating in its ZBTSI mode.
OFF* Tells HiGain that the ESF frame is operating in its normal
non-ZBTSI mode.
ESAL 17 Activates the alarm input signal to the LITESPAN microprocessor
and flashes the red STATUS LED when 17 Errored Seconds (ES)
(17 HDSL CRC errors on either HDSL loop or a total of 17 BPVs and
FERR) occur within a 24-hour period.
170 Activates the alarm input signal to the LITESPAN microprocessor
and flashes the red STATUS LED when 170 ES (170 HDSL CRC
errors on either HDSL loop or a total of 170 BPVs and FERR) occur
within a 24-hour period.
NONE* Prevents generation of an alarm due to excessive Errored Seconds.
ALM DIS* Disables assertion of the Alarm input signal to the LITESPAN
processor from the HLU processor. Note the HDSL LED still
flashes Red for an alarm condition even when the ALM DIS option
is chosen.
ENA Enables assertion of the Alarm input signal to the LITESPAN
processor from the HLU processor.
E C