PairGain HLU-431 User manual

HIGAIN LINE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-431-116-01-¨
SECTION 150-431-116-01
Model List Number Part Number
HLU-431 1F 150-1504-16
MARGIN
STATUS
BRG
SPAN
XMT
RCV
BRG
SPAN
dB
HLU 431
H G LINE UNIT
IAIN
SETUP
D
S
X
1
SELMODE
DCE
L
232RS
D
S
L
H
PairGain

Revision History of This Practice 150-431-116-01, Revision 01
ii May 14, 1999 HLU-431 List 1F
REVISION HISTORY OF THIS PRACTICE
©Copyright 1999 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in this document is company private toPairGain 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 Release Date Revisions Made
01 May 14, 1999 Initial release

150-431-116-01, Revision 01 Using This Technical Practice
HLU-431 List 1F May 14, 1999 iii
USING THIS TECHNICAL PRACTICE
The following conventions are used in this manual:
•Monospace type indicates screen text, including text you type at a screen prompt.
•Keys you press are indicated by small icons such as . Key combinations to be pressed simultaneously
are indicated with a plus sign as follows: + .
•Three types of messages, identified by icons, appear in text.
For a list of abbreviations used in this document, refer to “Appendix E - Glossary” on page 52.
If you have comments or questions about this Technical Practice, send email to
[e-mail].
Type the product name and document “section” number in the subject area of the email message.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and visually inspect the contents 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.
Order replacement equipment, if necessary.
•Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short
or irregular, contact PairGain as described in the Warranty. If you must store the equipment for a prolonged
period, store the equipment in its original container.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of personal injury.
Shock warnings Indicate the possibility of equipment damage or personal injury due to
electricity.
(17(5
&75/
(6&

Table of Contents 150-431-116-01, Revision 01
iv May 14, 1999 HLU-431 List 1F
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features.............................................................................................................................................. 1
Compatibility..................................................................................................................................... 1
Applications....................................................................................................................................... 2
Applications without Doublers ........................................................................................... 2
Applications with HiGain Doublers.................................................................................... 2
Positron High Voltage Protection ....................................................................................... 2
Front Panel __________________________________________________________________________ 3
Installation___________________________________________________________________________ 7
Verification........................................................................................................................................ 8
Verification without a Downstream Device........................................................................ 8
Verification with a Downstream Device............................................................................. 8
Provisioning Requirements ............................................................................................................... 9
Provisioning_________________________________________________________________________ 10
Using the SEL and MODE Buttons................................................................................................. 10
Setting Options through SEL and MODE......................................................................... 10
Resetting to Factory Default Values................................................................................. 11
Displaying System Parameter Settings............................................................................. 11
Disabling an Alarm........................................................................................................... 11
Loopback Modes............................................................................................................... 11
Using a Maintenance Terminal ....................................................................................................... 12
Connecting to a Maintenance Terminal............................................................................ 12
Accessing the Maintenance Terminal Screens.................................................................. 12
Using the Maintenance Terminal Screens....................................................................................... 14
View Span Status Screen .................................................................................................. 14
Set Clock Screen............................................................................................................... 18
System Settings Screen..................................................................................................... 19
Loopback Mode Screen .................................................................................................... 23
View Performance Data Screen........................................................................................ 26
View Performance History Screen.................................................................................... 28
View Alarm History Screen.............................................................................................. 30
Enter Circuit ID Screen..................................................................................................... 32
Troubleshooting _____________________________________________________________________ 33
System Alarms................................................................................................................................. 33
Retiring System Alarms.................................................................................................... 33
Self Test ............................................................................................................................ 34

150-431-116-01, Revision 01 Table of Contents
HLU-431 List 1F May 14, 1999 v
Loopback Operation.........................................................................................................................34
Smartjack (SMJK) Loopback............................................................................................34
Generic Loopback Code (GNLB)......................................................................................34
Addressable Repeater Loopback Functions ......................................................................34
Initiating Manual Loopback Sessions................................................................................35
Loopback Test Procedures.................................................................................................36
Loopback Configurations ..................................................................................................37
GNLB Loopback Test Procedures.....................................................................................38
A1LB, A2LB, and A5LB Test Procedures........................................................................39
A3LB and A4LB Test Procedures.....................................................................................41
Appendix A - Specifications____________________________________________________________ 43
HDSL Insertion Loss Guidelines.....................................................................................................44
Power Consumption.........................................................................................................................44
Card-edge Connector .......................................................................................................................45
Network Management Control Bus...................................................................................45
Fuse Alarm ........................................................................................................................45
System Alarm Relay Output..............................................................................................46
Craft Port..........................................................................................................................................46
Appendix B - Functional Operation _____________________________________________________ 47
Appendix C - Compatibility ___________________________________________________________ 48
Mounting..........................................................................................................................................48
Higain Doubler Circuit Deployment................................................................................................48
Appendix D - Product Support _________________________________________________________ 50
Technical Support............................................................................................................................50
World Wide Web .............................................................................................................................50
Returns.............................................................................................................................................50
Appendix E - Glossary________________________________________________________________ 52
Certification and Warranty______________________________________________ Inside Back Cover

List of Figures 150-431-116-01, Revision 01
vi May 14, 1999 HLU-431 List 1F
LIST OF FIGURES
Figure 1. HLU-431 List 1F Front Panel......................................................................................................... 3
Figure 2. Installing the HLU-431 into a Shelf............................................................................................... 7
Figure 3. Maintenance Terminal Main Menu.............................................................................................. 13
Figure 4. System Spans................................................................................................................................ 14
Figure 5. Span Status Screen: No Doubler .................................................................................................. 15
Figure 6. Span Status Screen: Two Doublers (Span 3)................................................................................ 15
Figure 7. Set Clock Screen........................................................................................................................... 18
Figure 8. System Settings Screen................................................................................................................. 19
Figure 9. Loopback Menu: No Doubler....................................................................................................... 24
Figure 10. Loopback Menu: Two Doublers................................................................................................... 24
Figure 11. NLOC Loopback Mode Reported in the Maintenance Terminal Main Menu............................. 25
Figure 12. Performance Data Screen: No Doubler........................................................................................ 27
Figure 13. Performance Data Screen: Two Doublers (Span 3)...................................................................... 27
Figure 14. 7 Day History Screen: No Doubler............................................................................................... 28
Figure 15. 7 Day History Screen: Two Doublers (Span 3)............................................................................ 29
Figure 16. Alarm History Screen: No Doubler.............................................................................................. 31
Figure 17. Alarm History Screen: Two Doublers (Span 3) ...........................................................................31
Figure 18. Doubler Loopback Configurations............................................................................................... 37
Figure 19. HLU-431 List 1F Card-Edge Connector...................................................................................... 45
Figure 20. RS-232 Craft Port Pinouts............................................................................................................ 46
Figure 21. HLU-431 Block Diagram............................................................................................................. 47

150-431-116-01, Revision 01 List of Tables
HLU-431 List 1F May 14, 1999 vii
LIST OF TABLES
Table 1. Front Panel Description..................................................................................................................4
Table 2. Front Panel Display Messages........................................................................................................5
Table 3. Navigational Keys on the Maintenance Terminal.........................................................................12
Table 4. Maintenance Terminal Screens.....................................................................................................13
Table 5. Span Status Fields and Descriptions.............................................................................................16
Table 6. HDSL System Alarms...................................................................................................................17
Table 7. Loopback Messages ......................................................................................................................17
Table 8. HLU-431 List 1F System Settings Screen Options.......................................................................20
Table 9. Loopback Field Messages and Descriptions.................................................................................23
Table 10. Errored and Unavailable Seconds Definitions..............................................................................26
Table 11. Alarm History Fields and Descriptions.........................................................................................30
Table 12. HDSl System Alarms....................................................................................................................33
Table 13. SPLB Loopback Command Set ....................................................................................................38
Table 14. Addressable 1, 2, 5, (A1LB, A2LB, A5LB) Repeater Loopback Commands..............................41
Table 15. Addressable 3 and 4 (A3LB and A4LB) Repeater Loopback Commands ...................................42
Table 16. HDSL Loss Over Cables...............................................................................................................44
Table 17. HiGain Doubler Deployment Matrix............................................................................................49

List of Tables 150-431-116-01, Revision 01
viii May 14, 1999 HLU-431 List 1F

150-431-116-01, Revision 01 Overview
HLU-431 List 1F May 14, 1999 1
OVERVIEW
The PairGain®HiGain®Line Unit HLU-431 List 1F is the Central Office (CO) side of a repeaterless
T1 transmission system. When used in conjunction with a HiGain Remote Unit (HRU), the system provides
1.544 Mbps transmission on two unconditioned copper pairs over the full Carrier Service Area (CSA) range. The
CSA includes loops up to 12,000 feet of24 AWG or 9,000 feet of 26 AWG wire, including bridged taps. This line
unit can be used with HiGain Doubler Units (HDUs) to extend reach.
FEATURES
•Front panel features:
–Four-character status display
–DS1 splitting and bridge access
–Status LED
–RS-232 craft port for connection to a maintenance terminal
•Selectable DS1 pre-equalizer
•Low HDSL voltage (-140 V) for all applications including doublers
•Compatible with any 400 mechanics shelf
•Selectable loopback activation codes
•Network Management and Administration (NMA) interface
•Non-volatile storage of user-selectable system options
•Lightning and power cross protection on HDSL interfaces
•784 kbps full duplex 2B1Q HDSL transmission on two pairs
•DS1 Loss of Signal (LOS) detector
•Margin threshold alarm
•HDSL AIS and SmartJack AIS options
•Easy reset to factory default user settings
•Circuit ID option
•Can be used with Positron High Voltage Protection (HVP) equipment (see “Higain Doubler Circuit
Deployment” on page 48).
COMPATIBILITY
The HLU-431 List 1F is designed to mount in 400 mechanics shelves. For a list of compatible shelves, see
“Appendix C - Compatibility” on page 48.
All generations of HiGain HLU and HRU modules are compatible with each other. To take advantage of the
enhanced features of newer HiGain doublers, refer to “Higain Doubler Circuit Deployment” on page 48.

Overview 150-431-116-01, Revision 01
2 May 14, 1999 HLU-431 List 1F
APPLICATIONS
HiGain systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital Service
(HCDS) over metallic pairs.
•The service is deployed over two unconditioned, non-loaded copper pairs, yet it demonstrates a quality that
is competitive with fiber optics.
•Conventional, in-line, T1 repeaters are not required.
•Cable pair conditioning, pair separation and bridged tap removal are not required.
In general, HiGain systems:
•operate with any number of other T1, POTS, Digital Data Service (DDS) or other HiGain systems sharing the
same cable binder group
•can be used with customers requiring DS1 service on a temporary or permanent basis
•provide a means of quickly deploying service in advance of fiber-optic transmission systems.
With a HiGain system, service can be provided within hours. Fiber-optic systems can be installed incrementally
and cut-over from the installed HiGain system when convenient to do so.
Applications without Doublers
For applications without doublers, the HLU-431 is directly connected to the HRU by the two HDSL cable pairs.
The HLU-431 List 1F is compatible with all HiGain HRUs.
Applications with HiGain Doublers
For doubler applications, one or two doublers may be used in the HDSL loops between the HLU and HRU for a
total of up to three spans.
Positron High Voltage Protection
Since the HLU-431 List 1F restricts its output voltage to 140 V for all applications including doublers, it can be
used with Positron High Voltage Protection (HVP) equipment. This equipment consists of High Voltage HDSL
isolation transformers and dc-to-dc converters located in external High Voltage Interface (HVI) cabinets. The two
HLU HDSL pairs are routed into the HVI cabinet where each terminates into a two-wire HDSL transformer card.
The HDSL-simplexed line voltage is accessed at the center taps of these two transformers and then applied to a
dc-to-dc converter circuit. The converter creates an identical, but isolated, output voltage that is reinserted onto
the outgoing HDSL pairs through a holding coil and then sent on to power the doubler. This equipment is used to
provide high voltage metallic isolation between the HLU and the cable network. Such isolation is required when
the HLU can be exposed to Ground Potential Rise (GPR) faults that can occur. For example, if the HLU is located
in a power utility substation or on a high voltage tower. The maximum input voltage that the dc-to-dc converter
can tolerate is 150 V which makes it compatible with the HLU-431 List 1F, whose maximum output voltage is
140 V. For more information on the HDSL-compatible HVP equipment, contact Positron at 303-688-5800.

150-431-116-01, Revision 01 Front Panel
HLU-431 List 1F May 14, 1999 3
FRONT PANEL
The HLU-431 List 1F front panel is shown is Figure 1. The front panel components are described in
Table 1 on page 4.
Figure 1. HLU-431 List 1F Front Panel

Front Panel 150-431-116-01, Revision 01
4 May 14, 1999 HLU-431 List 1F
Table 1. Front Panel Description
Front Panel Feature Function
Front panel display Displays four-character status, provisioning, and alarm system messages. The front
panel display illuminates when power is initially applied. To conserve power the
display only remains on for 4 minutes. Using the MODE or SEL buttons reactivates
the display and restarts the 4-minute timer. Refer to Table 2 on page 5 for a listing
of the four-character messages.
System option buttons
(MODE and SEL)
Permits the user options to be monitored and modified without the need of a
maintenance terminal. Used to initiate all HiGain loopbacks and to display DSX-1 line
parameters and line unit identity.
Status LED The status LED can report the following conditions:
Green Normal operation
Flashing green HDSL acquisition
Red Fuse Alarm
Flashing red System alarm
Yellow Self Test is in process or an HLU-431 Customer Remote Loopback (CREM) or a
Network Local Loopback (NLOC) is in effect.
DSX-1 access jacks
SPAN Provides splitting jack access to (XMT) and from (RCV), the HDSL span at the DSX-1
interface.Breaks the XMT and RCV paths to permit test signal insertion and retrieval.
BRIDGE Provides non-intrusive bridging jack access to (XMT) and from (RCV) the HDSL
span at the DSX-1 interface. Allows the two T1 payloads to be monitored.
Craft (RS-232) port Provides bidirectional communication between the unit and an external terminal to
allow configuration and performance monitoring through the Maintenance Terminal
screens.
List number Identifies the version of the HLU-431 List 1F.
CLEI/ECI bar code label Provides the human-readable Common Language Equipment Identifier (CLEI) code
number and the Equipment Catalog Item (ECI) bar code number.
Configuration Number Contains either a five-digit or six-digit warranty configuration number or a
standalone two or three-digit configuration number as follows:
Digit 1 = Last digit of shipment year
Digits: 2 and 3 = Shipment month
Digits: 4 and 5 = Configuration number
The configuration number can also be found on a small bar label that also contains
the Julian date code and part number. This gummed label may be attached to the PC
board or to the front panel.

150-431-116-01, Revision 01 Front Panel
HLU-431 List 1F May 14, 1999 5
Table 2. Front Panel Display Messages
Message Full Name Description
ALARM MESSAGES
ACO Alarm CutOff A system alarm has occurred, and has been retired to an ACO
condition by pressing the SEL button on the HLU front panel.
ALRM Alarm Condition Exists A system alarm condition is in effect.
LLOS Local Loss of Signal Indicates that no signal is detected at the T1 input to the HLU.
Causes a system alarm.
LOSW Loss of Sync Word Indicates that one of the HDSL loops has lost sync. Causes a system
alarm.
MAL1(2) Margin Alarm Loop 1 or 2 The margin on HDSL Loop 1 (2) has dropped below the threshold
(1 to 15 dB) as set by the operator.
RLOS Remote Loss of Signal Indicates that no signal is detected at the T1 input to the HRU.
Causes a system alarm.
LOOPBACK MESSAGES
ARM HiGain System ARMED Armed to respond to Intelligent Repeater Loop Codes.
CDn?Customer Doubler n Loopback Query to initiate loopback at doubler n to CI, where nis the number
of the doubler.
CLOC Customer Local Loopback Signal from Customer is looped back to the customer at the HRU.
CREM Customer Remote Loopback Signal from customer is looped back to the customer at HLU-431.
NDn?Network Doubler n Loopback Query to initiate loopback at doubler n to network, where nis the
number of the doubler.
NLOC Network Local Loopback DSX-1 signal is looped back to DSX-1 at HLU.
NREM Network Remote Loopback DSX-1 signal is looped back to DSX-1 at the HRU.
SMJK Remote SmartJack Loopback Signal from DS1 is looped back at the HRU by the HRU SmartJack
module.
TLOS Transmit Loss Of Signal HRU is in a logic loopback state caused by a loss of its T1 input from
the CI, if enabled at the HRU by its TLOS switch option.
DIAGNOSTIC MESSAGES
1=xx or 2=yy HDSL Loop Margin 1 or 2 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.
ACQ 1 or 2 Acquisition 1 or 2 The multiplexers of the HLU and HRU or first doubler are trying to
establish synchronization over Loops 1 or 2 of Span 1.
AnL1 or 2 Acquisition nLoop 1or 2 The multiplexers of the first doubler and either the HRU or second
doubler are trying to establish synchronization with each other on
Loops 1 or 2 of Span n, where nis the number of the span.
BAD RT? No response from HRU The HLU does not receive any response from the HRU. Thus, the
integrity of the HRU or the two HDSL loops (they may be open) is
questionable.

Front Panel 150-431-116-01, Revision 01
6 May 14, 1999 HLU-431 List 1F
CODE Line Code: AMI, B8ZS, AUTO The line code that HLU-431 is receiving at its DSX-1 interface, if the
DS1 option is set to Auto. Otherwise, it mimics either of the other
two DS1 line code settings, Alternate Mark Inversion (AMI) or
Bipolar with 8-zero Substitution (B8ZS). Displayed during System
Settings review mode.
DS0 DS0 Blocked Channels Indicates status of DS0 blocked channels. NONE indicates no
channels are blocked. BLK indicates some channels are blocked.
DS1 DS1 BPV Errors Indicates the number of BPVs at the HLU or HRU T1 inputs have
exceeded the 24-hour ES threshold. Causes a system alarm.
FERR Framing Bit Error Occurred Framing bit error occurred at HLU T1 input.
FRM Frame: SF, ESF, UNFR, NONE Defines the type of frame pattern being received from the DSX-1.
Displayed during System Settings review mode.
H1(2)ES HDSL CRC Error Channel 1 or 2 HLU HDSL Loop 1 or Loop 2 CRC error.
xHDU Number of Doublers This message indicates the number of doublers in the circuit.
INSL, then xxDB Maximum Insertion Loss The Maximum Insertion Loss message (INSL) appears followed by
xxDB, where xx is the maximum insertion in dB of all spans and
loops.
LBPV Local Bipolar Violation A bipolar violation has been received at the T1 input to the HLU-431.
LIST xxxx HLU-431 list number The software list number appears during the System Settings review
mode. Press the MODE button for 3 seconds to display the list
number.
MNGD Managed The HLU is under control of the HMU-319 Network management
unit. In this state, the front panel craft port and pushbuttons are
disabled.
PWR FEED GND Power Feed Ground One of the HDSL loops has been grounded.
PWR FEED OFF Power Feed Off HDSL span power has been turned off by setting the PWFD option
to DIS, or HDSL span power has been turned off by use of the
A1LB/A2LB/A5LB Intelligent Office Repeater (IOR) Power Down
code.
PWR FEED OPEN Power Feed Open Indicates an open circuit in the transmit or receive of either pair.
PWR FEED SHRT Power Feed Short Indicates a short between the two HDSL pairs. 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.
SELF TEST Self Test The HLU is in a self-test mode. This occurs every power On/Off
cycle.
SIG 1 or 2 Signal 1 or Signal 2 The transceivers of the HLU, HRU or first doubler are trying to
establish contact with each other on Loop 1 or Loop 2 of Span 1.
SnL1 or 2 Signal nLoop 1 or Loop 2 The transceivers of the first doubler and either the HRU or second
doubler are trying to establish contact with each other on Loop 1 or
Loop 2 of Span n.
VER xxxx HLU-431 software version number The software version number appears during the System Settings
review mode. Press the MODE button for 3 seconds to display the
software version.
Table 2. Front Panel Display Messages (Cont.)
Message Full Name Description

150-431-116-01, Revision 01 Installation
HLU-431 List 1F May 14, 1999 7
INSTALLATION
Figure 2. Installing the HLU-431 into a Shelf
To install the HLU-431:
1Slide the HLU-431 into the card guides for the desired slot, then push the unit back until it touches the
backplane card-edge connector (Figure 2).
2Place your thumbs on the HLU-431 front panel and push the HLU-431 into the card-edge connector until it
is entirely within the card guides and properly seated.
Upon receipt of the equipment, visually inspect it for signs ofdamage. If the equipment has been
damaged in transit, immediately report the extent of damage to the transportation company and
to PairGain Technologies, Inc.
When installing an HLU in a chassis,be sure to wear anantistatic wrist strap. Avoid touching
components on the circuit board.

Installation 150-431-116-01, Revision 01
8 May 14, 1999 HLU-431 List 1F
VERIFICATION
Once the HLU-431 is installed, verify that it is operating properly. To do this, you need to monitor the following:
•Status LED
•Status messages reported by the front panel display (see Table 2 on page 5)
Verification without a Downstream Device
If there is no downstream device installed:
1Verify that the HLU powers up. (The front panel display illuminates and reports four-character status
messages. See Table 2 on page 5 for a list of messages.)
2Verify that the HLU attempts to communicate with downstream devices. Even if a downstream device is not
present, the following events should occur:
aThe front panel display reports four-character status messages.
bThe HLU enters self-test mode (Status LED is yellow).
cSelf-test completes (Status LED is a steady green).
dThe HLU again attempts communication with downstream devices, repeating events athrough cuntil a
downstream device is detected.
Verification with a Downstream Device
If a downstream device has been installed:
1Verify the HLU powers up. (The front panel display illuminates and reports status messages.)
2Verify the HLU attempts to communicate with downstream devices (status LED flashes green). One of the
following occurs:
•If downstream devices are successfully identified and the HDSL loops synchronize, the HLU status LED
will be a steady green. The HLU reports normal margin messages on the front panel display.
•If downstream devices are not successfully identified, the HLU reports four-character status messages
and enters self-test mode. The HLU successively:
aenters self-test mode
bcompletes self-test mode
cattempts communication again
dreports four-character status messages.
The HLU repeats this cycle until a downstream device is detected.
3If there is more than one span, verify that each subsequent span synchronizes normally by monitoring the
front panel display messages.
4If a remote unit is installed, verify that the last span synchronizes normally. The HLU status LED should be
a steady green, and the front panel display reports normal margin messages.
5Verify that a valid T1 signal has been applied to the HLU and the HRU.
•If no T1 signal is being applied to either the HLU or the HRU inputs, then the appropriate T1 alarms
(LLOS or RLOS) are observed on the front panel display and the status LED flashes red.
•If a valid T1 signal is being supplied to the HLU and HRU, then T1 alarm indications should be absent
and the status LED should be a steady green.

150-431-116-01, Revision 01 Installation
HLU-431 List 1F May 14, 1999 9
PROVISIONING REQUIREMENTS
Refer to “Provisioning” on page 10 for information about using the MODE and SEL buttons or the Maintenance
Terminal screens to configure the HLU. While the MODE and SEL buttons can be used to manually accomplish
some provisioning tasks, such as setting system options, the Maintenance Terminal screens (available when you
connect a PC to the craft port) can handle all provisioning tasks. Tasks that you need to complete are:
1Set the time and date (see “Set Clock Screen” on page 18.)
2Set the circuit IDs (see “Enter Circuit ID Screen” on page 32.)
Assuming that the HLU has been successfully installed andprovisioned, youshould do the followingto ensure an
accurate Alarm History and Performance History.
1Clear the Alarm History screens (See “View Alarm History Screen” on page 30.)
2Clear Performance Data screens (See “View Performance Data Screen” on page 26.)
3Clear Performance History screens (See “View Performance History Screen” on page 28.)

Provisioning 150-431-116-01, Revision 01
10 May 14, 1999 HLU-431 List 1F
PROVISIONING
This is a reference section for HLU provisioning. There are two methods for provisioning the HLU-431:
•Use the MODE and SEL buttons on the front panel of the HLU to:
–set system options
–reset the HLU to its factory default settings for system options
–display system option settings (scroll mode)
–select system loopbacks
•Use a maintenance terminal (ASCII terminal or a PC running terminal emulation software) connected to the
HLU craft port to access the Maintenance Terminal Main Menu (Figure 3 on page 13). This gives you full
access to all HLU status, history, inventory, and provisioning screens.
USING THE SEL AND MODE BUTTONS
Setting Options through SEL and MODE
To provision the HLU-431 through the MODE and SEL buttons on the front panel:
1Press and the MODE button for two seconds and release. The front panel display alternately shows the first
system parameter and its current setting.
2Press the SEL button to step the display through all possible settings (one at a time) of the selected parameter.
3After the desired setting has been selected, press the MODE button. This updates the current displayed
parameter to the selected setting, and then advances to the next configurable parameter. After the last
parameter has been selected, a CONF NO message appears on the front panel display.
4Do one of the following:
•To cancel the session without saving the requested parameter changes, press the MODE button or, do
nothing. (After 30 seconds, the display returns to its normal mode without saving the new changes.)
•To accept the requested parameter changes, press the SEL button. (A CONF YES message displays, and
the display returns to its normal mode after saving the new changes.)
No dip switches or jumpers are required to provision the HLU-231 as it contains a non-volatile
RAM (NVRAM) which stores the system option settings. System option settings are retained if
shelf power is lost or if the HLU-231 is unplugged.

150-431-116-01, Revision 01 Provisioning
HLU-431 List 1F May 14, 1999 11
Resetting to Factory Default Values
All user options (Table 8 on page 20) can be set to the factory default values using the MODE and SEL buttons.
To set the user options to their default values:
1Press the SEL button for 6 seconds until the following message appears:
DFLT NO
2Press the SEL button while the DFLT NO message is displayed.
The message changes to DFLT YES indicating the factory default values are now in effect and the display
returns to the normal mode.
To terminate the DFLT mode without setting the factory default values, do one of the following:
•Press the MODE button to return to the normal display mode
•Wait 30 seconds for the unit to return to the normal display mode.
Displaying System Parameter Settings
To scroll throughthe current settings of all system parameters, press the MODE button for 3 or more seconds. The
following parameters are displayed:
•HLU software version number
•HLU List number
•Type of frame pattern being received from the DSX-1
•Line code of the signal being received from the DSX-1 (see note)
•HDSL power level setting
•All user-configured parameter settings
Disabling an Alarm
If the system is in a Minor alarm state, the alarm relay can be disengaged by pressing the SEL button. This turns
off the Alarm Cut-off (ACO) indication.
Loopback Modes
See “Loopback Operation” on page 34 for instructionson using the MODE andSEL buttons to activate loopbacks.
The line code parameter is the actual DSX-1 line code being received by the HLU if the DSX-1
code pattern is set to AUTO. Otherwise, the line code parameter mimics either of the other two
line code settings, Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution (B8ZS).

Provisioning 150-431-116-01, Revision 01
12 May 14, 1999 HLU-431 List 1F
USING AMAINTENANCE TERMINAL
Connecting to a Maintenance Terminal
The craft port on the front panel allows you to connect the HLU-431 to a maintenance terminal (ASCII terminal
or PC running a terminal emulation program). Once connected to a maintenance terminal, you can access the
maintenance, provisioning, and performance screens.
To connect to a maintenance terminal:
1Connect a standard 9-pin terminal cable to the RS-232 craft port (Figure 1 on page 3) on the HLU-431 front
panel.
2Connect the other end of the cable to the serial port on the maintenance terminal.
3Start a terminal emulation program such as ProComm (emulating a VT-100 terminal).
4Configure the maintenance terminal to the following communication settings:
•1200 to 9600 baud (9600 baud is recommended)
•no parity
•8 data bits
•1 stop bit
•hardware flow control to OFF
5Press the several times to initiate the autobaud connection and to initialize the Maintenance
Terminal screens.
Accessing the Maintenance Terminal Screens
The following sections describe how to use the Maintenance Terminal screens to view, provision and diagnose an
HLU-431 List 1F system.
Navigation Keys
Table 3 lists keys you can use on the maintenance terminal to navigate the Maintenance Terminal screens.
Table 3. Navigational Keys on the Maintenance Terminal
Key Function
Updates screen data
Clears screen data
Selects the next Span Status screen
Selects the next page of screen data
Exits the current screen
63$&(%$5
8
&
6
1
(