PairGain HLU-231 User manual

HIGAIN LINE UNIT
QUICK INSTALLATION GUIDE
PAIRGAIN TECHNOLOGIES, INC.
SECTION 350-231-203-01
Revision History of this guide.
Revision 01—November 26, 1997
A) Initial Release
Model List Part Number CLEI Code
HLU-231 Issue 2 3 150-1243-03 T1LIE0N4AA

Section 350-231-203 Revision 01
ii HLU-231 List 3 Issue 2
Table of Contents
Introduction ...........................................................................1
Features ............................................................................2
Compatibility ...................................................................3
Installation .............................................................................4
HLU-231 Card-Edge Connectors ....................................4
Installing the HLU-231 ....................................................5
Provisioning ...........................................................................5
Using the SEL and MODE Front Panel Buttons .............6
Default Settings ................................................................6
Using the Craft port .........................................................7
System 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 © 1997 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.

Revision 01 Section 350-231-203
HLU-231 List 3 Issue 2 1
Introduction
The PairGain®HiGain®Line Unit Model HLU-231 List 3 Issue 2 (Part Num-
ber 150-1243-03) is the Central Office (CO) side of a repeaterless T1 trans-
mission system. It is used in conjunction with the HiGain HRU Remote Unit
to provide a complete HiGain High-bit-rate Digital Subscriber Line (HDSL)
system.
For more detailed information consult the HLU-231 List 3 Issue 2 Technical
Practice (Section Number 150-231-203).
The HLU-231is not compatible withHiGain doublers.

Section 350-231-203 Revision 01
2 HLU-231 List 3 Issue 2
Features
The HLU-231 Line Unit List 3 Issue 2 front panel features are:

Revision 01 Section 350-231-203
HLU-231 List 3 Issue 2 3
The HLU-231 List 3 Issue 2 front panel components are:
Compatibility
The HLU-231 List 3 Issue 2 is designed to mount in the following shelves
with 220 mechanics:
• PairGain HCS-418 19-inch shelf
• PairGain HCS-417 23-inch shelf
• 220-configuration Office Repeater Bay (ORB) shelf or equivalent Small
Cross Section Shelf (SXSS)
• Kentrox T-Term shelf
• PairGain HCS-402 shelf
Name Function
Front panel display Four character LCD that provides status messages for
HDSL, S/N margin, optional settings and alarms.
System
option buttons MODE and SEL (Select) buttons used to set system modes.
Status LED Tri-color LED that indicates system state:
Green Normal Operation
Flashing Green HDSL Acquisition
Flashing Red Minor Alarm
Red FUSE ALRM
Yellow Self Test in progress or an
HLU-231 List loopbackineffect
(CREM) or (NLOC)
Flashing Yellow The HLU-231intelligent loop-
back is in an ARMED state
Receive (RCV) and
Transmit (XMT) Splittingaccessandbridging"210-Bantam"-typejacks.
Craft port RS-232 connector that provides access to the mainte-
nance, provisioning, and performance monitoring inter-
face through a dumb terminal.
Retaining latch Secures the HLU-231 to the shelf in which it is installed.

Section 350-231-203 Revision 01
4 HLU-231 List 3 Issue 2
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).
HLU-231 Card-Edge Connectors
The HLU-231 card-edge connector pinouts are shown below. The HLU-231
uses pins 20 and 21 as alarm-relay output. The Kentrox 220 T-Term shelf
uses the same pins for external equalizer output. If the HLU-231 is installed
into a Kentrox shelf, the HLU-231 ALM option must be disabled (see Provi-
sioning on page 5 for further information).
The HLU-231 is incompatible with the newer Kentrox 224
shelves when these shelves are optioned to connect their -V
line (which is normally -48) to -130 V. The -V line connects to
pin 40. The HLU-231connects 40 to 39 and 39 to the -48 V line,
which causes the conflict.

Revision 01 Section 350-231-203
HLU-231 List 3 Issue 2 5
Installing the HLU-231
To install the HLU-231 into a PairGain 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:
Provisioning
The HLU-231 List 3 Issue 2 contains a non-volatile RAM (NVRAM) that
stores the system option settings. The options are set through the SEL
(Select) and MODE buttons onthe front panel, or through a terminal connect-
ed to the Craft port. System option settings are retained if shelf power is lost
or if the HLU-231 Issue 2 List 3 is unplugged.

Section 350-231-203 Revision 01
6 HLU-231 List 3 Issue 2
Using the SEL and MODE Front Panel Buttons
To provision the HLU-231 List 3 Issue 2 through the SEL and MODE front-
panel buttons:
1Press the MODE button for approximately one second. The message
displayedon thefrontpanelalternates betweenthe firstsystemparameter
and its current setting.
2PresstheSELbutton 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 dis-
play prompts you to confirm the settings.
4Do one of the following:
•PresstheSEL button to install the settings.
•PresstheMODE button to bypass the settings.
If neither button is pressed in 30 seconds, the settings are bypassed.
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 fac-
tory 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.

Revision 01 Section 350-231-203
HLU-231 List 3 Issue 2 7
Using the Craft port
The Craftport, a 9-pin RS-232connector,on the HLU-231 front panel allows
youto use astandard RS-232cable to connectyour systemtoa dumbterminal
or PC running aterminal emulation program. Once connected you can access
themaintenance, provisioning, and performance screens.
Toprovision the HLU-231 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
•1 stop bit
•Hardware Flow Control set to NONE
•VT Terminal Emulation
2Use a serial cableto connect theRS-232 COM port onthe dumb terminal
to the HLU-231 front panel Craft port.
3On each screen, enter the key represented by the letter in parenthesis for
theparameterto 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 four user options must be set via the dumb terminal interface:
Circuit ID, Time and Date, DS0 Blocking, and Margin Alarm Threshold.
If usingthe Microsoft Windows terminalemulation program,
from the Settings, Terminal Preference menu,deselect
ShowScroll Bars and UseFunction , Arrow ,and CtrlKeysfor
Windows
.
E C

Section 350-231-203 Revision 01
8 HLU-231 List 3 Issue 2
System Settings
The asterisks (*) in the following system settings descriptions indicate the
factory default settings.
HLU-231 List 3 System Options
Mode Selection Description
EQL EXT* Selectsextended equalizer.
0Sets theinternal equalizer to DSX-1 for 0 - 133feet.
133 Sets theinternal equalizer to DSX-1 for 133 - 266feet.
266 Sets theinternal equalizer to DSX-1 for 266 - 399feet.
399 Sets theinternal equalizer to DSX-1 for 399 - 533feet.
533 Sets theinternal equalizer to DSX-1 for 533 - 655feet.
ZBTS ON Selects the ExtendedSuperframe(ESF) frame ZBTSI
mode.
OFF* Deslects theESF frameZBTSI mode.
LPBK DIS Configures theHLU-231 toignorethe 2 in 5 Smart-Jack
loopbackcommand.
ENA* Enables theHLU-231 to respondto the 2 in5 Smart-Jack
loopbackcommand.
LBTO NONE Disables automatictime-out cancellationof all loopbacks.
20 Setsautomaticcancellationof allloopbacksto20minutes
after initiation.
60 Setsautomaticcancellationof allloopbacksto60minutes
after initiation.
120*Setsautomatic cancellation of all loopbacksto120
minutes after initiation.
ALM DIS* Opensthe relayalarm contacts, if closed, and prevents
another relayalarm closure from occurring.
ENA Enables activationof the minor alarm relay whena minor
alarm condition occurs.