ADC HiGain HLU-432 User manual

USER MANUAL
HLU-432 L1
HiGain
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HiGain Line Unit
HLU-432 List 1
Part Number: 150-2248-01
CLEI Code: T1L4JLGB

150-432-100-02
ii July 18, 2002 HLU-432 List 1
Revision History of This Practice
Copyright
July 18, 2002
© 2002 ADC DSL Systems, Inc. All rights reserved.
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of ADC DSL Systems, Inc.
No right, license, or interest to such trademarks is granted hereunder, and you agree that no such right, license, or interest
shall be asserted by you with respect to such trademark.
Other product names mentioned in this document are used for identification purposes only and may be trademarks or
registered trademarks of their respective companies.
Disclaimer of Liability
Information contained in this document is company privateto ADC DSL Systems, Inc., and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice.
In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and ADC further
disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of
liability applies to all products, publications and services during and after the warranty period.
Revision Release Date Revisions Made
01 June 2, 2000 Initial release.
02 July 18, 2002 ADC Rebranding

150-432-100-02 Using This Technical Practice
HLU-432 List 1 July 18, 2002 iii
USING THIS TECHNICAL PRACTICE
The following conventions are used in this manual:
•Monospace type indicates screen text.
•Keys you press are indicated by small icons such as or . Key combinations to be pressed
simultaneously are indicated with a plus sign as follows: + .
•Items you select are in bold.
•Three types of messages, identified by icons, appear in text.
For a list of abbreviations used in this document, refer to Appendix E - Abbreviations.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and 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 ADC. 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 ADC as described in the Warranty located inside the back cover. 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 personal injury.
The Electrostatic Discharge (EDS) susceptibility symbol indicates that a device or assembly is
susceptible to damage from electrostatic discharge.
YENTER
CTRL ESC

Inspecting Shipment 150-432-100-02
iv July 18, 2002 HLU-432 List 1

150-432-100-02, Revision 02 Table of Contents
HLU-432 List 1 July 18, 2002 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features..............................................................................................................................................1
Product Enhancements ........................................................................................................1
Standard Features ................................................................................................................1
Compatibility .....................................................................................................................................2
Applications .......................................................................................................................................2
HiGain Doubler Applications..............................................................................................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 MODE and SEL Buttons.................................................................................................10
Setting Options through MODE and SEL.........................................................................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.....................................................................................................25
View Performance Data Screen.........................................................................................28
View Performance History Screen ....................................................................................30
View Alarm History Screen ..............................................................................................32
View System Inventory Screen .........................................................................................34
View Troubleshooting Screen ...........................................................................................36
Troubleshooting _____________________________________________________________________ 39
System Alarms.................................................................................................................................39
Alarm Option for DLC Feed .............................................................................................40

Table of Contents 150-432-100-02, Revision 02
vi July 18, 2002 HLU-432 List 1
Retiring System Alarms.................................................................................................... 40
Self Test ............................................................................................................................ 40
Loopback Operation........................................................................................................................ 41
Generic Loopback Commands.......................................................................................... 41
Special Loopback Commands........................................................................................... 43
Initiating a Manual Loopback Session.............................................................................. 44
Loopback Test Procedures .............................................................................................................. 45
General Troubleshooting Tips .......................................................................................... 45
GNLB Test Procedures..................................................................................................... 45
A1LB, A2LB, and A5LB Test Procedures....................................................................... 47
A3LB and A4LB Test Procedures .................................................................................... 50
Appendix A - Specifications____________________________________________________________ 51
HDSL Insertion Loss Guidelines..................................................................................................... 52
Power Consumption ........................................................................................................................ 52
Power Consumption without Doublers............................................................................. 52
Power Consumption with Doublers.................................................................................. 53
Maximum Power Dissipation.......................................................................................................... 55
Maximum Current Drain................................................................................................................. 55
HLU-432 Card Connector............................................................................................................... 56
Network Management Control Bus .................................................................................. 56
Fuse Alarm........................................................................................................................ 56
System Alarm Relay Output............................................................................................. 57
Craft Port......................................................................................................................................... 57
Appendix B - Functional Operation _____________________________________________________ 58
Timing ............................................................................................................................................. 58
Ground Fault Detect........................................................................................................................ 59
Appendix C - Compatibility____________________________________________________________ 60
T1 Repeater Shelves and Related Equipment ................................................................................. 60
HiGain Doubler Circuit Deployment .............................................................................................. 60
Appendix D - Product Support ___________________________________________________________ 62
Appendix E - Abbreviations____________________________________________________________ 63
Certification and Warranty _____________________________________________ Inside Back Cover

150-432-100-02, Revision 02 List of Figures
HLU-432 List 1 July 18, 2002 vii
LIST OF FIGURES
1. HLU-432 List 1 Front Panel............................................................................................................................3
2. Installing the HLU-432 List 1 into a Shelf......................................................................................................7
3. Maintenance Terminal Main Menu...............................................................................................................13
4. System Spans.................................................................................................................................................14
5. Span Status Screen: No Doubler ...................................................................................................................15
6. Span Status Screen: Four Doublers (Span 5) ................................................................................................15
7. Set Clock Screen............................................................................................................................................18
8. System Settings Screen..................................................................................................................................19
9. Loopback Menu: No Doubler........................................................................................................................26
10. Loopback Menu: Four Doublers ...................................................................................................................26
11. NLOC Loopback Mode Reported in the Maintenance Terminal Main Menu..............................................27
12. Performance Data Screen: No Doubler.........................................................................................................29
13. Performance Data Screen: Four Doublers (Span 5)......................................................................................29
14. 31-Day Performance History Screen: No Doubler........................................................................................30
15. 31-Day Performance History Screen: Four Doublers (Span 5).....................................................................31
16. Alarm History Screen: No Doubler...............................................................................................................33
17. Alarm History Screen: Four Doublers (Span 5)............................................................................................33
18. System Inventory Screen: No Doubler..........................................................................................................35
19. System Inventory Screen: Four Doublers......................................................................................................35
20. Troubleshooting Screen for a Doubler Application ......................................................................................36
21. Troubleshooting Screen Describing Circuit Problem....................................................................................36
22. Troubleshooting with Help............................................................................................................................37
23. Troubleshooting with Margin Values............................................................................................................38
24. Troubleshooting with Insertion Loss Values.................................................................................................38
25. Loopback Summary.......................................................................................................................................41
26. Loopback Configurations..............................................................................................................................46
27. HLU-432 List 1 Card-edge Connector..........................................................................................................56
28. RS-232 Craft Port Pinouts.............................................................................................................................57
29. HLU-432 List 1 Block Diagram....................................................................................................................58

List of Tables 150-432-100-02, Revision 02
viii July 18, 2002 HLU-432 List 1
LIST OF TABLES
1. Front-Panel Description................................................................................................................................... 4
2. Front-Panel Display Messages......................................................................................................................... 5
3. Navigational Keys on the Maintenance Terminal ......................................................................................... 12
4. Maintenance Terminal Screens...................................................................................................................... 13
5. Span Status Fields and Descriptions.............................................................................................................. 16
6. HDSL System Alarms ................................................................................................................................... 17
7. Loopback Messages....................................................................................................................................... 17
8. HLU-432 List 1 System Settings................................................................................................................... 20
9. Loopback Field Messages and Descriptions.................................................................................................. 25
10. Errored and Unavailable Seconds Definitions............................................................................................... 28
11. Alarm History Fields and Descriptions ......................................................................................................... 32
12. HDSL System Alarms ................................................................................................................................... 39
13. Summary of HiGain Loopback Codes........................................................................................................... 42
14. Addressable Repeater Loopback Commands (A1LB, A2LB, A5LB)........................................................... 47
15. Addressable Repeater Loopback Commands (A3LB and A4LB)................................................................. 50
16. HDSL Loss Over Cables................................................................................................................................ 52
17. HLU-432 List 1 Power Parameters—No Doubler......................................................................................... 52
18. HLU-432 List 1 Power Parameters—Single Doubler (HDU-451 List 1 or 2)............................................. 53
19. HLU-432 List 1 Power Parameters—Single Doubler (HDU-439 or HDU-437 Lists 1 and 1B).................. 53
20. HLU-432 List 1 Power Parameters—Single Doubler (HDU-409 List 2) ..................................................... 53
21. HLU-432 List 1 Power Parameters—Two Doublers (HDU-451 List 3, 4, 3B or 4B) .................................. 54
22. HLU-432 List 1 Power Parameters—Two Doublers (HDU-439 or HDU-437 Lists 1 and 1B).................... 54
23. HLU-432 List 1 Power Parameters—Two Doublers (HDU-409 List 2)....................................................... 54
24. HLU-432 List 1 Power Parameters—Three and Four Doublers (HDU-409 List 2)...................................... 54
25. HiGain Doubler Deployment Matrix............................................................................................................. 61

150-432-100-02, Revision 02 Overview
HLU-432 List 1 July 18, 2002 1
OVERVIEW
The ADC®HiGain®Line Unit HLU-432 List 1 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 of 24 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
Product Enhancements
•Five-span range with four doublers (60 kft, 24 AWG)
•Four line-powered spans (three doublers and one remote)
•Reduced power consumption
•Ultra-low wander (Stratum 1 compliant)
•Low line-power option (-135 Vdc) for circuits with a single doubler
•Selectable Power Feed (PWRF) modes: Auto, High, and Low
•Grounded loop detection on High-bit-rate Digital Subscriber Line (HDSL)
•Bipolar Violation Transparency (BPVT) options
•Bit Error Rate (BER) alarm options
•HRU loopback screen
•Inventory and troubleshooting screens
•Loss of Signal/Alarm Indicator Signal (LOS/AIS) payload alarm option
•Remote Loss of Signal (RLOS) disable alarm option
•Default setting screen option
•Payload (PL) or HiGain (HG) loopback source identification
Standard Features
•Selectable DS1 pre-equalizer
•Front-panel features:
–Four-character status display
–DS1 splitting and bridge access
–Status LED
–RS-232 craft port for connection to a maintenance terminal
•Compatible with 200- or 400-mechanics shelves, and equivalent
•Selectable loopback activation codes
•Network Management and Administration (NMA) interface
•Lightning and power cross-protection on HDSL interfaces

Overview 150-432-100-02, Revision 02
2 July 18, 2002 HLU-432 List 1
•Full-duplex 2B1Q HDSL transmission on two pairs at 784 kbps
•Margin threshold alarm
COMPATIBILITY
The HLU-432 is designed to mount in 200 or 400 mechanics shelves. For a list of compatible shelves, see
“Appendix C - Compatibility” on page 60.
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 60.
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.
HiGain Doubler Applications
For applications without doublers, the HLU-432 is directly connected to the HRU by the two HDSL cable pairs.
The HLU-432 is compatible with all HiGain HRUs.
For doubler applications, one to four doublers may be used in the HDSL loops between the HLU and HRU.
•If the HRU is line-powered, the HLU-432 can power three doublers and theremote unit (HRU-402)for a total
of four spans.
•If the HRU is locally powered, the HLU can power up to four doublers for a total of five spans.
These extended ranges are only available when using the HDU-409, HDU-404, or HDU-407
micro-doublers with the HRU-402 remote units. Legacy doublers (HDU-451, HDU-439, and
HDU-437) cannot be used in circuits with more than two doublers in any line or local power
system. For compatibility guidelines on mixing newer doublers with older HRU and HLU
models, refer to “HiGain Doubler Circuit Deployment” on page 60.
For additional information about associated HiGain equipment, refer to the respective HiGain
technical practice (see “Appendix D - Product Support” on page 62).

150-432-100-02, Revision 02 Front Panel
HLU-432 List 1 July 18, 2002 3
FRONT PANEL
The HLU-432 front panel is shown in Figure 1. The front-panel components are described in Table 1. For pinout
diagrams of the HLU card-edge connector and the craft port, refer to “Appendix A - Specifications” on page 51.
Figure 1. HLU-432 List 1 Front Panel
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Front Panel 150-432-100-02, Revision 02
4 July 18, 2002 HLU-432 List 1
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-432 Customer Remote Loopback (CREM) or a Network Local
Loopback (NLOC) is in effect.
Flashing yellow HLU-432 is armed to respond to Intelligent Repeater Loop (ILR) codes.
DSX-1 access jacks
SPAN Provides splitting jack access both to the transmit (XMT) and from the receive (RCV) HDSL span
at the DSX-1 interface. Breaks the XMT and RCV paths to permit test signal insertion and retrieval.
BRG Provides non-intrusive bridging jack access to both to the transmit (XMT) and from the receive
(RCV) 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.
CLEI and ECI bar code label Provides the human-readable Common Language Equipment Identifier (CLEI) code number and the
Equipment Catalog Item (ECI) bar code number.
List number Identifies the version of the HLU-432.
Configuration number label Contains either a five or six-digit warranty configuration number or a stand-alone two or three-digit
configuration number as follows:
Digit 1 - Last digit of shipment year
Digits 2 and 3 - Shipment month
Digits 4, 5, and 6 - Configuration number
The configuration number can also be found on a small bar label that contains the Julian date code
and part number. This gummed label may be affixed to the PC board or to the front panel.

150-432-100-02, Revision 02 Front Panel
HLU-432 List 1 July 18, 2002 5
Table 2 lists the front-panel display messages. The four-character panel display reports the code of a pertinent
alarm, loopback or diagnostic message, in some cases followed by a second four-character message that modifies
the first message with a value or current configuration setting.
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 A system alarm condition is in effect.
BER Bit Error Rate A system BER alarm 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 or MAL2 Margin Alarm Loop 1 or Loop 2 The margin on HDSL Loop 1 or Loop 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 DS1 input to the HRU.
Causes a system alarm.
LOOPBACK MESSAGES
CDUn?Customer Doubler nLoopback 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-432.
NDUn?Network Doubler nLoopback 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 DSX-1 is looped back at the HRU by the HRU SmartJack
module.
DIAGNOSTIC MESSAGES
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.
ACQ1 or ACQ2 Acquisition 1 or 2 The multiplexers of the HLU and the HRU or first doubler are trying to
establish synchronization over Loops 1 or 2 of Span 1.
AnL1 or AnL2 Acquisition nLoop 1 or Loop 2 The multiplexers of the two devices on Span nare trying to establish
synchronization with each other on Loops 1 or 2, where nis the
number of the span.
ARM HiGain System Armed Armed to respond to Intelligent Repeater Loop Codes.
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.
CODE xxxx Line Code: AMI, B8ZS, AUTO The line code that HLU-432 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.

Front Panel 150-432-100-02, Revision 02
6 July 18, 2002 HLU-432 List 1
DS0 DS0 Blocked Channels Indicates status of DS0 blocked channels. NONE indicates no
channels are blocked. BLK indicates some channels are blocked.
FERR Framing Bit Error Framing bit error occurred at HLU T1 input.
FRM xxxx Frame: SF, ESF, UNFR, NONE Defines the type of frame pattern being received from the DSX-1:
SuperFrame (SF), Extended SuperFrame (ESF), Unframed (UNFR), or
NONE. Displayed during System Settings review mode.
H1ES or H2ES HDSL CRC Error Channel 1 or
Channel 2 HDSL Loop 1 or Loop 2 CRC error.
nHDU Number of Doublers This message indicates the number (n) 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-432.
LIST xxxx HLU-432 List Number The software list number (xxxx) 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.
PWRF GND Power Feed Ground One of the HDSL loops has been grounded.
PWRF ON Power Feed On Indicates that the HDSL loops are neither short nor grounded.
PWRF 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.
PWRF 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.
SIG1 or SIG2 Signal 1 or Signal 2 The transceivers of the HLU and HRU or first doubler are trying to
establish contact with each other on Loop 1 or Loop 2 of Span 1.
SnL1 or SnL2 Signal nLoop 1 or Loop 2 The transceivers of the two devices on Span nare trying to establish
contact with each other on Loop 1 or Loop 2, where nis the number
of the span.
TLOS Transmit Loss of Signal DSX-1 signal is looped back to the DSX-1 interface at the HRU. HRU
is in a logic loopback state caused by a loss of its DS1 input from the
CI, if enabled at the HRU by its TLOS switch option.
VER xxxx HLU-432 Version Number The software version number (xxxx) 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

150-432-100-02, Revision 02 Installation
HLU-432 List 1 July 18, 2002 7
INSTALLATION
Figure 2. Installing the HLU-432 List 1 into a Shelf
Slide the HLU-432 into the card guides of the desired slot, then push the unit into the enclosure until it is seated
in the card-edge connector (Figure 2).
Upon receipt of the equipment, 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 ADC.
When installing an HLU-432 in a chassis, be sure to wear an antistatic wrist strap. Avoid
touching components on the circuit board.
200-mechanics enclosure
HLU-432L1
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HLU-432 List 1

Installation 150-432-100-02, Revision 02
8 July 18, 2002 HLU-432 List 1
VERIFICATION
Once the HLU-432 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).
cThe HLU again attempts communication with downstream devices, repeating events athrough buntil 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.

150-432-100-02, Revision 02 Installation
HLU-432 List 1 July 18, 2002 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 “View System Inventory Screen” on page 34).
Assuming that the HLU has been successfully installed and provisioned, you should do the following to ensure an
accurate Alarm History and Performance History.
1Clear the Span Status, Performance Data, and Performance History screens. This can be accomplished by
pressing (clear) at the Span Status screen (see “View Span Status Screen” on page 14).
2Clear the Alarm History screens (see “View Alarm History Screen” on page 32).
C

Provisioning 150-432-100-02, Revision 02
10 July 18, 2002 HLU-432 List 1
PROVISIONING
This is a reference section for HLU provisioning. There are two methods for provisioning the HLU-432:
•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 MODE AND SEL BUTTONS
Setting Options through MODE and SEL
To provision the HLU-432 through the MODE and SEL buttons on the front panel:
1Press the MODE button for two seconds and then release it. 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 appears, and
the display returns to its normal mode after saving the new changes.)
No dip switches or jumpers are required to provision the HLU-432 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-432 is unplugged.

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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 six 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 through the current settings of all system parameters, press the MODE button for three 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 Cutoff (ACO) indication.
Loopback Modes
See “Loopback Operation” on page 41 for instructions on using the MODE and SEL 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).

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12 July 18, 2002 HLU-432 List 1
USING AMAINTENANCE TERMINAL
Connecting to a Maintenance Terminal
The craft port on the front panel allows you to connect the HLU-432 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-432 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 VT100 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-432 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
Automatically updates the screen data
Updates screen data
Clears screen data
Selects the next Span Status screen (for doubler applications)
, , , , or Selects a specific Span Status screen (for doubler applications)
Selects the previous page of screen data
Selects the next page of screen data
Exits the current screen
Selects the Loopback menu from the Troubleshooting screen
Returns to the main Troubleshooting screen from the Troubleshooting (H)elp, (M)argin Values or
(I)nsertion Loss screens
SPACEBAR
A
U
C
S
1 2 3 4 5
P
N
E
L
B