PairGain HiGain Line Unit HLU-388 User manual

HIGAIN LINE UNIT
QUICK INSTALLATION GUIDE
PAIRGAIN TECHNOLOGIES, INC.
SECTION 350-388-124-01
Revision history of this guide.
Revision 01—January 27, 1998
A) Initial Release
Model List Part Number CLEI Code
HLU-388 2D 150-1141-24 T1L2BBBAAA

Section 350-388-124-01 Revision 01
Page ii HLU-388 List 2D
Table of Contents
Introduction............................................................................1
Compatibility..........................................................................2
Installation..............................................................................3
Card-Edge Connectors .....................................................3
Installing the Line Unit ....................................................4
HDSL Line Voltage Option...................................................5
Provisioning............................................................................5
Using the SEL and Mode Front Panel Buttons ................5
Default Settings ................................................................6
Using the Craft port .........................................................6
System Options Settings ..................................................7
Testing...................................................................................10
Alarms ............................................................................10
Loopbacks ......................................................................11
Four-Character Diagnostic Messages ............................13
Specifications........................................................................15
Documentation .....................................................................15
Technical Support................................................................15
Bulletin Board Services .................................................16
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 350-388-124-01
HLU-388 List 2D Page 1
Introduction
The PairGain®HiGain®Line Unit Model HLU-388 List 2D (Part Number
150-1141-24) 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.
Thisguide addressesHLU-388List2D operationwhenusedwithandwithout
doublers. For applications without doublers, the HLU-388 List 2Dis 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-388
List 2D and the HRU.
The following figure shows the front panel of the HLU-388 Line Unit
List 2D.

Section 350-388-124-01
Page 2 HLU-388 List 2D
The HLU-388 List 2D front panel tri-color Status LED has the following
states:
Compatibility
The HLU-388 mounts in the group of both wire-wrapped and connectorized
shelves listed below. The HLU-388 slot pins are shown in the Card-Edge
Connectors on page 3.
23" Shelf
• Larus FT2 1188 (28 slot connectorized)
• AT&T DS1 Ext. (28 slot connectorized)
19" Shelf
• Larus FT2 1187 (20 slot connectorized)
23" Cabinet Distant Terminal
• Larus FT2 1190 (12 slots) for 51A cabinet mount
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-388 List 2Dloopback in
effect (CREM) or (NLOC).
Flashing Yellow The HLU-388 List 2Dis in an ARMED (pre-loopback) state.

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HLU-388 List 2D 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 15).
Card-Edge Connectors
The HLU-388 card-edge connector pinouts are shown below.

Section 350-388-124-01
Page 4 HLU-388 List 2D
Installing the Line Unit
Slide the HLU-388 into the shelf card guides for the desired slot, tilt the front
panel up. Push the unit in until it is entirely within the card guide. Tilt the
front panel back down so that the latch locks the unit in place:

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HLU-388 List 2D Page 5
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. Doublerapplications will 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-388 List 2D 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-388 List 2D is unplugged. The System Options table on page 7 lists
the system options for the HLU-388 List 2D.
Using the SEL and Mode Front Panel Buttons
To provision the HLU-388 List 2D through the SEL and MODE front-panel
buttons:
1Press the MODE button for approximately one second. The message
displayedonthe frontpanel alternatesbetweenthe firstsystem parameter
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.

Section 350-388-124-01
Page 6 HLU-388 List 2D
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-388 front panel allows
you to use a standard RS-232 cable toconnect your system to adumb terminal
or PC runninga terminal emulationprogram. Once connectedyou can access
the maintenance, provisioning, and performance screens.
To provision the HLU-388 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
3Use a serial cable to connect the RS-232 COM port on the dumb terminal
to the HLU-388 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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HLU-388 List 2D Page 7
4On 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
confirm 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-388 List 2D 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 Indicates to HiGain that the ESF frame is operating in its ZBTSI
mode.
OFF* Indicates to 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

Section 350-388-124-01
Page 8 HLU-388 List 2D
DS0 BLK The DS0 blocking option can only be set through the RS-232
maintenance port with a terminal. The 4-character HLU-319 List
2D front panel LED readout only displays the BLK indicates at least
one channel is blocked.
NONE* No channels are blocked.
LBTO NONE Disables automatic time-out cancellation of all loopbacks.
20 Sets automatic cancellation of all loopbacks to 20 minutes after
initiation.
60* Sets automatic cancellation of all loopbacks to 60 minutes after
initiation.
120 Sets automatic cancellation of all loopbacks to 120 minutes after
initiation.
LPBK DIS Configures the HLU-200 to ignore the 2 in 5 Smart-Jack loopback
command.
ENA* Enables the HLU-200 to respond to the 2 in 5 Smart-Jack loopback
command.
SPLB GNLB* Configures the HiGain system to respond to the generic
(3/4/5/6 in 7) 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.
DS1 B8ZS Places both the HLU and HRU into their B8ZS modes.
AMI* Places both the HLU and HRU into their AMI modes.
AUTO The HLU and HRU independently monitor their incoming T1 bit
streams for the B8ZS pattern. If either unit detects this pattern, it
enters its B8ZS mode.
HLU-388 List 2D System Options (Cont.)
Mode Selection Description

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HLU-388 List 2D Page 9
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
SF or ESF frame pattern. This feature is required for fractional T1
applications (DS0 blocking) where it insures proper channel time
slot alignment. While HiGain can also process unframed data in
this AUTO mode, it is recommended that the UNFR 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 AIS signal at both the HLU and HRU
T1 output ports when both of the HDSL loops are not in sync
(LOSW).
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 minor alarm occurs.
SAIS ENA* Causes the HRU to transmit the AIS signal towards the CI when in
NREM loopback.
DIS Prevents the AIS signal from being transmitted to the NI and
replaces it with the network test signal in the HRU List 6 and 8 or
by a quiet termination (LOS) in the HRU List 7.
MARG 0 to 15 dB The Margin Alarm Threshold determines the minimum allowable
margin below which an alarm will occur.
4* Default value.
CONF YES Confirms that all operating modes (listed in this table) 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
options settings mode was entered.
HLU-388 List 2D System Options (Cont.)
Mode Selection Description

Section 350-388-124-01
Page 10 HLU-388 List 2D
Testing
TheHLU-388List2D4-characterfrontpanel displayhas manyusefulsystem
diagnostic messages. They are listed in the following table. This display
turns on when power is initially applied to the HLU-388 List 2D. To conserve
power, the display only remains on for five minutes if neither the MODE or
SEL buttons are pressed. The use of either button activates the 4-character
display and restarts the 5-minute power-control timer.
Alarms
Only one alarm can be displayed at a time, therefore, only the highest priority
alarm is displayed if more than one alarm exists. The following table lists the
alarms in order of priority.
Status Menu Alarm Messages
Message Full Name Description
NONE No Alarms
LLOS Local Loss of Signal No signal at the HLU-388 List 2Dlocal T1
interface.
RLOS Remote Loss of Signal No signal at the HRU remote T1 interface.
LOSW1 or
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 CRC’s have exceeded the user
selected ES threshold.
DS1 Digital Service 1 DS1 input BPVs at the HRU have exceeded the
user selected ES threshold.
RAIS or
LAIS
Remote Alarm Indicating
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 The Loop 1 and 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.
ACO Alarm CutOff A minor alarm occurred and was retired to an
ACO condition after pressing the SEL button on
the HLU front panel.

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HLU-388 List 2D Page 11
Loopbacks
The HLU-388 List 2D loopback messages are listed in the following tables.
A block diagram showing the GNLB locations and their activation codes are
shown on page 12.
Loopback Descriptions
Message Full Name Description
SMJK Smart-Jack Loopback Loopback at HRU (remote) toward the CBA
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 (remote) toward the CBA
initiated by upstream in-band codes or from
the maintenance terminal.
NLOC Network Local Loopback Loopback at HLU, (local) toward the CBA
initiated by upstream in-band codes or from
the maintenance terminal.
CLOC Customer Local Loopback Loopback at HRU (local) toward CI initiated
from CPE (customer) by in-band codes or
from the maintenance terminal.
CREM Customer Remote
Loopback
Loopback at HLU, (remote) toward
customer initiated from CPE (customer) by
in-band codes or from the maintenance
terminal.
ARM Armed The HiGain system detected the IR 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 CI, if enabled at
the HRU via its TLOS switch option.

Section 350-388-124-01
Page 12 HLU-388 List 2D
Doubler Loopback Descriptions
Message Full Name Description
NDU1 Network Doubler 1
Loopback
The loopback at doubler 1 toward the CBA
initiated by in-band codes, or the
maintenance terminal.
NDU2 Network Doubler 2
Loopback
The loopback at doubler 2 toward the CBA
initiated by in-band codes or the
maintenance terminal.
CDU1 Customer Doubler 1
Loopback
The loopback at doubler 1 toward CI
initiated by in-band codes or the
maintenance terminal.
CDU2 Customer Doubler 2
Loopback
The loopback at doubler 2 toward CI
initiated by in-band codes or the
maintenance terminal.

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HLU-388 List 2D Page 13
Four-Character Diagnostic Messages
The HLU-388 diagnostic messages are listed in the table below.
Four-Character Front Panel 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-319.
SIG 1 or 2 Signal 1 or Signal 2 The HLU and HRU or 1st Doubler transceivers
are trying to establish contact with each other on
Loops 1 or 2 of span 1.
S2L1 or 2†Signal 2 Loop or
Loop 2
The 1st Doubler and either HRU or 2nd Doubler
transceivers are trying to establish contact with
each other on loops 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.
ACQ 1 or 2 Acquisition 1 or
Acquisition 2
The HLU and HRU or 1st Doubler multiplexers
are trying to establish synchronization over each
of Loops 1 or 2 of span 1.
A2L1 or 2†Acquisition 2 Loop 1 or
Loop 2
The 1st Doubler and either HRU or 2nd Doubler
multiplexers are trying to establish
synchronization with each other on loops 1 or 2
of span 2.
A3L1 or 2†Acquisition 3 Loop 1 or
Loop 2
The 2nd Doubler and either HRU multiplexers
are trying to establish synchronization 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, by pressing the SEL button
on the HLU front panel.
Self Test The HLU is in a self test mode. This occurs
every power ON/OFF cycle.
ALRM Alarm Condition
Exists
A minor alarm condition is in effect.
†These messages only apply to systems with doublers present.

Section 350-388-124-01
Page 14 HLU-388 List 2D
1=xx or 2=yy HDSL Loop Margins Indicates the power of the received HDSL signal
on each Loop relative to noise. 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 that 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 the T&R of either
HDSL pair in span 1.
PWR FEED
OFF
Power Feed Off HDSL span power has been turned off by setting
the PSFD option to DIS.
BAD RT? No response from HRU The HLU does not receive any response from the
HRU. Thus, the HRU’s integrity is questionable.
VER HLU Software
Version #
Displays during the System Settings review
mode. Depress the MODE button for 3 seconds
to view the software version.
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 mode defined above.
CODE Line Code: AMI, B8ZS This is the line code that HLU-388 List 2Dis
receiving at its DSX-1 interface. Displayed
during System Setting review mode.
DS0 DS0 Blocked Channels Indicates status of DS0 blocked channels.
NONE indicates no channels are blocked. BLK
indicates some channels are blocked.
MNGD Managed The HLU-388 List 2D is under control of the
HMU network management unit. In this state,
the RS-232 maintenance port on the
HLU-388’s front panel is inoperative.
Four-Character Front Panel Messages (Cont.)
Message Full Name Description
†These messages only apply to systems with doublers present.

Revision 01 Section 350-388-124-01
HLU-388 List 2D Page 15
Specifications
Maximum Power Consumption
14 Watts (without Doubler); 23 Watts (with Doubler).
Maximum Heat Dissipation
6Watts (without Doubler); 8Watts (with Doubler).
Mounting
Type DDM, high density shelf or eqivalent
Dimensions
Height:3.5"(8.9 c.m.)
Width:0.72"(1.8 c.m.)
Depth:10.25"(26 c.m.)
Weight:1 lb. 2 oz.
Documentation
The HLU-388 List 2D has a complete technical practice that you can
download 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.
Ifyou have anycomments on any PairGain documentation, send mail to
[e-mail]. Type the product name and the
section number of the document in the subject area of the email message.
Technical Support
PairGainTechnicalAssistanceisavailable24-hours-a-day,7-days-a-weekby
contacting PairGain CustomerService Engineering group at:
Telephone: [phone] or [phone]
Fax: [phone]
During normal business hours (8:00AM to5:00 PM, Pacific Time, Monday
- Friday, excluding holidays), technical assistance calls are normally
answered directly by a CustomerService Engineer.At other times, a request
for technical assistance is handled by an on-duty Customer Service Engineer
througha callback process. This process normally results in a callback within
30 minutes of initiating the request.

Section 350-388-124-01
Page 16 HLU-388 List 2D
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 [phone]. Transmission speeds
up to 28.8 Kbps are supported with a character format of 8-N-1.

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