PairGain T1LIE044AA User manual

HIGAIN LINE UNIT
QUICK INSTALLATION GUIDE
PAIRGAIN TECHNOLOGIES, INC.
SECTION 350-231-134-01
Revision History of this guide.
Revision 01—November 25, 1997
A) Initial Release
Model List Part Number CLEI Code
HLU-231 3D 150-1111-34 T1LIE044AA

Section 350-231-134 Revision 01
ii HLU-231 List 3D
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 350-231-134
HLU-231 List 3D 1
Introduction
The PairGain®HiGain®Line Unit Model HLU-231 List 3D (Part Number
150-1111-34) is the Central Office (CO) side of a repeaterless T1 transmis-
sion 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.
ThisguideaddressesHLU-231List3Doperationwhen usedwithandwithout
doublers. For applications without doublers, the HLU-231 List 3Dis 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-231 List
3D and the HRU.
For more detailed information consult the HLU-231 List 3D Technical Prac-
tice (Section Number 150-231-134).

Section 350-231-134 Revision 01
2HLU-231 List 3D
Features
The HLU-231 Line Unit List 3D front panel features are:

Revision 01 Section 350-231-134
HLU-231 List 3D 3
The HLU-231 List 3D front panel components are:
Compatibility
The HLU-231 List 3D 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 3Dloopback in
effect (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 350-231-134 Revision 01
4HLU-231 List 3D
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 following
rules apply to the HLU-231 card-edge connector:
• If the shelf uses pin 23 remove resistor R39 from the HLU-231 board.
This removes the burn-in circuit from pin 23.
• 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 Provisioning on page 5 for further information).

Revision 01 Section 350-231-134
HLU-231 List 3D 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
TheHLU-231 List 3D containsanon-volatileRAM (NVRAM) that stores the
system option settings. The options are set through the SEL (Select) and
MODE buttons on the front panel, or through a terminal connected to the
Craft port. System option settings are retained if shelf power is lost or if the
HLU-231 List 3D is unplugged.

Section 350-231-134 Revision 01
6HLU-231 List 3D
Using the SEL and MODE Front Panel Buttons
To provision the HLU-231 List 3D through the SEL and MODE front-panel
buttons:
1Press the MODE button for approximately one second. The message
displayed on thefrontpanel alternatesbetween the firstsystemparameter
and its current setting.
2Pressthe 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 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 350-231-134
HLU-231 List 3D 7
Using the Craft port
The Craft port, a 9-pin RS-232 connector, on the HLU-231 front panel allows
youto use a standard RS-232cableto connectyoursystemto a dumbterminal
or PC running aterminal emulation program. Once connected youcan access
the maintenance, 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
•1stopbit
•Hardware Flow Control set to NONE
•VT Terminal Emulation
2Use a serial cable to connect the RS-232 COMporton the dumbterminal
to the HLU-231 front panel Craft port.
3On each screen, enter the key represented by the letterin 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 four user options must be set via the dumb terminal interface:
Circuit ID, Time and Date, DS0 Blocking, and Margin Alarm Threshold.
If usingtheMicrosoft Windows terminal emulation program,
from the Settings, Terminal Preference menu, deselect
ShowScroll Bars
and
UseFunction
,
Arrow
,and
CtrlKeysfor
Windows
.
E C

Section 350-231-134 Revision 01
8HLU-231 List 3D
System Settings
The asterisks (*) in the following system settings descriptions indicate the
factory default settings.
HLU-231 List 3D System Options
Mode Selection Description
EQL EXT* Selects extended equalizer.
0Sets the internal equalizer to DSX-1 for 0 - 133 feet.
133 Sets the internal equalizer to DSX-1 for 133 - 266 feet.
266 Sets the internal equalizer to DSX-1 for 266 - 399 feet.
399 Sets the internal equalizer to DSX-1 for 399 - 533 feet.
533 Sets the internal equalizer to DSX-1 for 533 - 655 feet.
ZBTS ON Selects the Extended Superframe (ESF) frame ZBTSI
mode.
OFF* Deslects the ESF frame ZBTSI mode.
LPBK DIS Configures the HLU-231 to ignore the 2 in 5 Smart-Jack
loopback command.
ENA* Enables theHLU-231 to respond to the 2 in5 Smart-Jack
loopback command.
LBTO NONE Disables automatic time-out cancellation of all loopbacks.
20 Sets automatic cancellation of all loopbacks to20 minutes
after initiation.
60 Sets automatic cancellation of all loopbacks to60 minutes
after initiation.
120* Sets automatic cancellation of all loopbacks to 120
minutes after initiation.
ALM DIS* Opens the relay alarm contacts, if closed, and prevents
another relay alarm closure from occurring.
ENA Enables activation of the minor alarm relay when a minor
alarm condition occurs.

Revision 01 Section 350-231-134
HLU-231 List 3D 9
ESAL 17 ClosestheAlarmrelaycontactsandflashestheredStatus
LED when 17 ES (17 HDSL CRC errors on either HDSL
loop or a total of 17 BPVs) occur within a 24-hour period.
170 ClosestheAlarmrelaycontactsandflashestheredStatus
LED when 170 ES (170 HDSL CRC errors on either HDSL
loop or a total of 170 BPVs) occur within a 24-hour period.
NONE* Prevents generation of an alarmdue to excessive Errored
Seconds.
SPLB GNLB* Configures the HiGain system to respond to the generic
in-band loopback codes.
A1LB and
A2LB Configures the HiGain system to respond to the Teltrend
addressable repeater in-band loopback codes.
A3LB Configures the HiGain system to respond to the Wescom
addressable repeater in-band loopback codes.
A4LB Configures the HiGain system to respond to the Wescom
Mod 1 addressable repeater in-band loopback codes.
A5LB Configures the HiGain system to respond to the Teltrend
Mod 1 addressable repeater in-band loopback codes.
PWRF DIS Disables powering to the HRU and/or doubler over the
HDSL pairs.
ENA* Enables powering to the HRU and/or doubler over the
HDSL pairs.
LNCD B8ZS Places both the HLU and HRU into their B8ZS modes.
AMI* Places both the HLU and HRU into their AMI modes.
MARG 0 to 15 dB The Margin Alarm Threshold determines the minimum
allowable margin below which an alarm will occur.
4* Default value.
HLU-231 List 3D System Options (Continued)
Mode Selection Description

Section 350-231-134 Revision 01
10 HLU-231 List 3D
DS0 BLK The DS0 blocking option can only be set through the Craft
port with a terminal. The 4-character HLU-231 List 3D
front panel LED readout only displays the status of the
blocking option. BLK indicates at least one channel is
blocked.
NONE* NONE indicates no channels are blocked.
FRMG AUTO Configures HiGain to operate in an auto-framing (AUTO)
mode in which it continuously searches the input T1 bit
stream for a valid Superframe or Extended Superframe
pattern. This feature is required for fractional T1 applica-
tions (DS0 blocking) where it insures proper channel time
slot alignment. While HiGain can also process unframed
datainthisAUTOmode,itisrecommendedthattheUNFR
mode be used for all unframed applications. Using the
AUTO mode for unframed applications runs the risk of
detecting "pseudo valid" frame sequences, which can
affect the data integrity.
UNFR* Configures HiGain to operate in an unframed mode. This
mode disables the auto framing process and forces
HiGain to function as a transparent bit pipe.
HAIS 2LP* Causes HiGain to transmit the Alarm Indication Signal
(AIS) signal at both the HLU and HRU T1 output ports
when both of the HDSL loops are not in sync (Loss of
Sync-Word).
1LP Causes HiGain to transmit the AIS signal at both the HLU
and HRU T1 output ports when either of the two HDSL
loops is not in sync (LOSW) or if a margin alarm occurs.
SAIS ENA* Causes the HRU to transmit the AIS signal towards the
Customer Interface (CI) when in NREM loopback.
DIS Prevents the AIS signal from being transmitted to the net-
work interface and replaces it with the network test signal
orbya quiettermination(Lossof Signal)dependingonthe
list number of the HRU.
CONF YES Confirms that all operating modes (listed above) are to be
updated to their current selections.
NO* Prevents the most recently selected operating mode
selections from being updated. They remain as they were
before the system option settings mode was entered.
HLU-231 List 3D System Options (Continued)
Mode Selection Description

Revision 01 Section 350-231-134
HLU-231 List 3D 11
Testing
Minor alarm and diagnostic messages routinely appear on the HLU-231
front-panel four-character display. This display automatically turns on when
power is initially applied to the HLU-231. To conserve power, the display
remains on for only five minutes if neither the MODE or SEL buttons are
pressed. The use of either button activates the four-character display and
restarts the 5-minute power-control timer.
Alarms
Only one alarm can be displayed at a time, so the highest priority alarm is dis-
played if more than one alarm exists. The following table lists the alarms
ordered by priority:
Status Menu Alarm Messages
Message Full Name Description
NONE No Alarms
LLOS Local Loss of Signal No signal from HLU-231 local T1 interface.
RLOS Remote Lossof Signal No signal from HRU remote T1 interface.
MNR Minor Alrm A minor alarm condition is in effect.
LOSW1or
LOSW2 Loss of Sync Word 1
or 2 HDSL loop 1 or 2 has lost sync.
H1ES or
H2ES HDSL Loop 1 or 2
Errored Second Loop 1 or 2 has incurred a CRC error.
DS1 Digital Service 1 DS1 input BPVs at the HRU have
exceeded the user selected ES threshold.
RAIS Remote Alarm Indicat-
ing Signal Indicates an AIS (all “1”) pattern is being
transmitted from the remote or T1 output
port.
MAL1 or
MAL2 Margin Alarm 1 or 2 The margin on HDSL loop 1 or 2 has
dropped below the threshold (1 to 15 dB)
set by the user.
CHREV Channels Reserved TheLoop 1 & 2 HDSL pairs are reversed at
the HRU input port. Loop 1 is specified to
carry the (-) simplex DC voltage, and Loop
2 is specified to carry the (+) simplex DC
voltage.

Section 350-231-134 Revision 01
12 HLU-231 List 3D
Loopbacks
The HLU-231 loopback messages are listed in the following two tables. A
block diagram showing the GNLB locations and their activation codes are
shown on page 13.
Status Menu Loopback Messages
Message Full Name Description
SMJK Smart-Jack Loopback Loopback at HRU toward the HLU initiated
by either the (2 in 5) in-band loopback code
or the out-of-band ESF data link code.
NREM Network Remote
Loopback Loopback at HRU toward the HLU initiated
by upstream in-band codes or from the
dumb terminal.
NLOC Network Local
Loopback Loopback at HLU toward the network initi-
ated by upstream in-bandcodes or fromthe
dumb terminal.
CLOC Customer Local
Loopback Loopback at HRU toward customer initiated
from Customer Premises Equipment (CPE)
by in-band codes or from the dumb
terminal.
CREM Customer Remote
Loopback Loopback at HLU toward customer initiated
from CPE by in-band codes or from the
dumb terminal.
ARM Armed The HiGain system detected the Intelligent
Repeater loopback (2 in 5) arming code.
TLOS Transmit Loss of
Signal (Loopback) HRU is in a logic loopback state caused by
a loss of its T1 input from the customer, if
enabled at the HRU through its TLOS
switch option.

Revision 01 Section 350-231-134
HLU-231 List 3D 13

Section 350-231-134 Revision 01
14 HLU-231 List 3D
Four-Character Diagnostic Messages
The HLU-231 diagnostic messages are listed in the table below.
Diagnostic Messages
Message Full Name Description
FERR Framing Bit Error
Occurred Framing bit error occurred at HLU T1
input.
LBPV Local Bipolar
Violation A bipolar violation has been received at
the T1 input to the HLU.
SIG1 or SIG2 Signal 1 or Signal 2 The HLU and HRU transceivers are trying
to establish contact with each other.
S2L1 or 2†Signal 2 Loop or
Loop 2 The 1st Doubler and either the HRU or
2nd Doubler transceivers are trying to
establishcontactwitheachotheronloops
1 or 2 of span 2.
S3L1 or 2†Signal 3 Loop or
Loop 3 The 2nd Doubler and HRU transceivers
are trying to establish contact with each
other on loops 1 or 2 of span 3.
ACQ1 or
ACQ2 Acquisition 1 or
Acquisition 2 The HLU and HRU multiplexers are trying
to establish synchronization over each
loop.
A2L1 or 2†Acquisition 2 Loop
1 or Loop 2 The 1st Doubler and either HRU or 2nd
Doubler multiplexers are trying to estab-
lish synchronization with each other on
loops 1 or 2 of span 2.
A3L1 or 2†Acquisition 3 Loop
1or Loop 2 The 2nd Doubler and either HRU multi-
plexers are trying to establish synchroni-
zation with each other on loops 1 or 2 of
span 3.
ACO Alarm CutOff A minor alarm has occurred, and been
retired to an ACO condition, through the
use of the HLU front panel SEL button.
Self Test The HLU is in a self test mode. This
occurs every power ON/OFF cycle.
† These messages only apply to systems with doublers present.

Revision 01 Section 350-231-134
HLU-231 List 3D 15
ALRM Alarm Condition
Exists A minor alarm condition is in effect.
1=xx or 2=yy HDSL Loop
Margins Indicates the relative S/N at each HDSL
transceiving input port. Any value of ‘06’
or greater is adequate for reliable system
operation.
PWR FEED
SHRT Power Feed Short Indicates a short between the 2 HDSL
pairs in span 1. This same message can
occur with an HRU is drawing the correct
amount of power over good cable pairs
but cannot communicate with the HLU.
PWR FEED
OPEN Power Feed Open Indicates an open circuit in both the tip
and ring of either HDSL pair in span 1.
BAD RT? No response from
HRU The HLU does not receive any
responsefrom theHRU. Thus,theHRU’s
integrity is questionable.
VER HLU Software
Version # This is displayed during the System
Settings review mode. (Depress the
MODE button for 3 seconds to enter Sys-
tem Settings review mode.)
LIST 0xL HLU’s List # Displayed during System Settings
review mode defined above.
FRM Frame: SF, ESF,
UNFR, NONE Defines the type of frame pattern
being received from the DSX-1.
Displayed during System Settings.
CODE Line Code: AMI,
B8ZS Thisis the line code that the HLU is set to
receive and transmit at its T1
interfaces. Displayed during System
Settings mode defined above.
Diagnostic Messages (Continued)
Message Full Name Description
† These messages only apply to systems with doublers present.

Section 350-231-134 Revision 01
16 HLU-231 List 3D
Specifications
Maximum Power Consumption
18 Watts (without Doubler); 25 Watts (with Doubler)
Maximum Heat Dissipation
8 Watts (without Doubler); 9 Watts (with Doubler)
Mounting
AT&T 220-configuration or equivalent.
Dimensions
Height: 5.9” (15 cm)
Width: 1.4” (3.5 cm)
Depth: 10” (25.4 cm)
Documentation
The HLU-231, List 3D has a complete technical practice that you can down-
load from the PairGain Technical Manuals Web page at:www.pairgain.com.
A password is required. If you do not have a password, contact your PairGain
sales representative.
If you have any comments on any PairGain documentation, send mail to
technical_publications@pairgain.com. Type the product name and the sec-
tion number of the document in the subject area of the email message.
Technical Support
PairGainTechnicalAssistanceisavailable24-hours-a-day,7-days-a-weekby
contacting PairGain Customer Service Engineering group at:
Telephone: (800) 638-0031 or (714) 832-9922
Fax: (714) 832-9924
During normal business hours (8:00 AM to 5:00 PM, Pacific Time, Monday
- Friday, excluding holidays), technical assistance calls are normally
answered directly by a Customer Service Engineer. At other times, a request
for technical assistance is handled by an on-duty Customer Service Engineer
through acallback process. This process normallyresults in a callback within
30 minutes of initiating the request.

Revision 01 Section 350-231-134
HLU-231 List 3D 17
Bulletin Board Services
PairGain maintains a computer bulletin board system for obtaining current
information on PairGain products, product troubleshooting tips and aids,
accessing helpful utilities, and for posting requests or questions. This system
is available 24-hours-a-day by calling (714) 730-3299. Transmission speeds
up to 28.8 kbps are supported with a character format of 8-N-1.

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