ADC HiGain HLU-231 LIST 8D Original operating instructions

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
 Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to 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.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HLU-231 LIST 8D
The HiGain®HLU-231 List 8D Line Unit 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 in applications with or without HiGain Doubler Units
(HDUs).
FEATURES
SPECIFICATIONS
•Front panel status LED and four-character
status display •Payload (PL) or HiGain (HG) loopback source identification
•Ultra-low wander •Reduced power consumption
•Five-span range with four doublers
(60 kft, 24 AWG) •Low line-power option (-140 V) for circuits with a single doubler
•Selectable Power Feed modes •Bit Error Rate (BER) alarm options
•Loss of Signal (LOS)/Alarm Indicator
Signal (AIS) payload alarm option •Bipolar Violation Transparency (BPVT) options
•Additional screens for inventory and
troubleshooting •Grounded loop detection
Operating Temperature -40 °F to +149 °F (-40 °C to +65 °C)
Operating Humidity 5% to 95% non-condensing
HDSL Span Voltage -135 or ±112 Vdc
Mounting 220 mechanics shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB at 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
DS1 Line Rate 1.544 Mbps ±200 bps
DS1 Line Format Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution
(B8ZS)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF)
DSX-1 Pulse Output 6 V pk-pk, pre-equalized for 0 to 655 feet of ABAM cable
DSX-1 Input Level +1.5 to -7.5 dB DSX
INSTALLATION
To ensure proper installation of the HLU-231:
1Align the HLU-231 with the shelf rails and slide the unit in.
2When the HLU is properly seated, the retaining latch on the HLU snaps closed.
POWER-UP SEQUENCE
When the HLU powers up, the four-character display illuminates and reports status
messages.
If the HLU is not communicating with the next span device, the following occurs:
1Alarm and diagnostic messages display (see the Front Panel Alarm Messages and
Front Panel Diagnostic Messages tables inside), followed by the SELF TEST
message.
2The Status LED turns yellow, indicating it has entered self-test mode.
If the HLU is communicating with the next span device, the following occurs:
1The Status LED flashes green while acquiring each device in the system and turns
a steady green when the entire system is operating without any alarms.
2The four-character display reports margin (signal-to-noise ratio) readings and
insertion loss.
3If the status LED is not solid green, the display reports alarm conditions (see the
Front Panel Alarm Messages table inside).
PROVISIONING
1Access the Maintenance Terminal screens by pressing the several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the System Settings selection on the Main Menu to change the default
settings of any system parameters.
3Access the View Troubleshooting screen to view a graphical analysis of any
potential system problems.
When the HLU has been successfully installed and provisioned, clear the Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
H
I
G
AIN
HLU 231
HLU-231 LIST 8D
LINE UNIT
QUICK INSTALLATION
´,2<¶0•¨
1218280
October 8, 1999
Product Catalog: HLU-231-L8D
CLEI: T1L2BZ0A
Document: 350-231-184-06, Issue 6

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
 Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to 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.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HLU-231 LIST 8D
The HiGain®HLU-231 List 8D Line Unit 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 in applications with or without HiGain Doubler Units
(HDUs).
FEATURES
SPECIFICATIONS
•Front panel status LED and four-character
status display •Payload (PL) or HiGain (HG) loopback source identification
•Ultra-low wander •Reduced power consumption
•Five-span range with four doublers
(60 kft, 24 AWG) •Low line-power option (-140 V) for circuits with a single doubler
•Selectable Power Feed modes •Bit Error Rate (BER) alarm options
•Loss of Signal (LOS)/Alarm Indicator
Signal (AIS) payload alarm option •Bipolar Violation Transparency (BPVT) options
•Additional screens for inventory and
troubleshooting •Grounded loop detection
Operating Temperature -40 °F to +149 °F (-40 °C to +65 °C)
Operating Humidity 5% to 95% non-condensing
HDSL Span Voltage -135 or ±112 Vdc
Mounting 220 mechanics shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB at 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
DS1 Line Rate 1.544 Mbps ±200 bps
DS1 Line Format Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution
(B8ZS)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF)
DSX-1 Pulse Output 6 V pk-pk, pre-equalized for 0 to 655 feet of ABAM cable
DSX-1 Input Level +1.5 to -7.5 dB DSX
INSTALLATION
To ensure proper installation of the HLU-231:
1Align the HLU-231 with the shelf rails and slide the unit in.
2When the HLU is properly seated, the retaining latch on the HLU snaps closed.
POWER-UP SEQUENCE
When the HLU powers up, the four-character display illuminates and reports status
messages.
If the HLU is not communicating with the next span device, the following occurs:
1Alarm and diagnostic messages display (see the Front Panel Alarm Messages and
Front Panel Diagnostic Messages tables inside), followed by the SELF TEST
message.
2The Status LED turns yellow, indicating it has entered self-test mode.
If the HLU is communicating with the next span device, the following occurs:
1The Status LED flashes green while acquiring each device in the system and turns
a steady green when the entire system is operating without any alarms.
2The four-character display reports margin (signal-to-noise ratio) readings and
insertion loss.
3If the status LED is not solid green, the display reports alarm conditions (see the
Front Panel Alarm Messages table inside).
PROVISIONING
1Access the Maintenance Terminal screens by pressing the several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the System Settings selection on the Main Menu to change the default
settings of any system parameters.
3Access the View Troubleshooting screen to view a graphical analysis of any
potential system problems.
When the HLU has been successfully installed and provisioned, clear the Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
H
I
G
AIN
HLU 231
HLU-231 LIST 8D
LINE UNIT
QUICK INSTALLATION
´,2<¶0•¨
1218280
October 8, 1999
Product Catalog: HLU-231-L8D
CLEI: T1L2BZ0A
Document: 350-231-184-06, Issue 6

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
 Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to 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.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HLU-231 LIST 8D
The HiGain®HLU-231 List 8D Line Unit 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 in applications with or without HiGain Doubler Units
(HDUs).
FEATURES
SPECIFICATIONS
•Front panel status LED and four-character
status display •Payload (PL) or HiGain (HG) loopback source identification
•Ultra-low wander •Reduced power consumption
•Five-span range with four doublers
(60 kft, 24 AWG) •Low line-power option (-140 V) for circuits with a single doubler
•Selectable Power Feed modes •Bit Error Rate (BER) alarm options
•Loss of Signal (LOS)/Alarm Indicator
Signal (AIS) payload alarm option •Bipolar Violation Transparency (BPVT) options
•Additional screens for inventory and
troubleshooting •Grounded loop detection
Operating Temperature -40 °F to +149 °F (-40 °C to +65 °C)
Operating Humidity 5% to 95% non-condensing
HDSL Span Voltage -135 or ±112 Vdc
Mounting 220 mechanics shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB at 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
DS1 Line Rate 1.544 Mbps ±200 bps
DS1 Line Format Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution
(B8ZS)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF)
DSX-1 Pulse Output 6 V pk-pk, pre-equalized for 0 to 655 feet of ABAM cable
DSX-1 Input Level +1.5 to -7.5 dB DSX
INSTALLATION
To ensure proper installation of the HLU-231:
1Align the HLU-231 with the shelf rails and slide the unit in.
2When the HLU is properly seated, the retaining latch on the HLU snaps closed.
POWER-UP SEQUENCE
When the HLU powers up, the four-character display illuminates and reports status
messages.
If the HLU is not communicating with the next span device, the following occurs:
1Alarm and diagnostic messages display (see the Front Panel Alarm Messages and
Front Panel Diagnostic Messages tables inside), followed by the SELF TEST
message.
2The Status LED turns yellow, indicating it has entered self-test mode.
If the HLU is communicating with the next span device, the following occurs:
1The Status LED flashes green while acquiring each device in the system and turns
a steady green when the entire system is operating without any alarms.
2The four-character display reports margin (signal-to-noise ratio) readings and
insertion loss.
3If the status LED is not solid green, the display reports alarm conditions (see the
Front Panel Alarm Messages table inside).
PROVISIONING
1Access the Maintenance Terminal screens by pressing the several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the System Settings selection on the Main Menu to change the default
settings of any system parameters.
3Access the View Troubleshooting screen to view a graphical analysis of any
potential system problems.
When the HLU has been successfully installed and provisioned, clear the Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
H
I
G
AIN
HLU 231
HLU-231 LIST 8D
LINE UNIT
QUICK INSTALLATION
´,2<¶0•¨
1218280
October 8, 1999
Product Catalog: HLU-231-L8D
CLEI: T1L2BZ0A
Document: 350-231-184-06, Issue 6

LOOPBACK TESTING
Initiate loopback testing from the HiGain maintenance menus or use the MODE and SEL buttons. The hexidecimal inband codes shown below can be sent by a test set.
* Fuse alarm is normally floating and at -48 Vdc
when activated.
** System minor alarm contacts (pins 20 and 21) are
normally open and close upon alarm.
14 15 16 17 18 19 20 21 22 23 24 25
DS1 Tip Ground
Burn-in
DS1 Ring
Ground
DS1 Tip1
DS1 Ring1
39 40 41 42 43 44 45 46 47 48 49 50
-48V
1 2 3 4 5 6 7 8 9 10 11
HDSL2 Tip
HDSL2 Ring
FuseAlarm*
HDSL1 Tip1
HDSL1 Ring1
KEY KEY
26
27 28 29 30 31 32 33 34
35 36 37
38
12 13
Alarm**
NM Control Bus
Card-edge Connector
Modem settings 1200-9600 baud 8 data bits No parity 1 stop bit Hardware flow control:OFF Terminal emulation software:VT-100
dB
MARGIN
HDSL
MODE SEL
RCV
BRG
XMT
L
SPAN SPAN BRG
DSX-1
R S 2 3 2
SETUP
STATUS
Four-character display
DSX-1 test access jacks
CLEI and ECI bar code label
List number (HLU version number)
Configuration number
Retaining latch
Displays status, provisioning, and alarm messages. See table below for a list of message descriptions.
SPAN
BRG
Provides splitting jack access to (XMT) and from (RCV) the HDSL span at the DSX-1 interface.
Provides non-intrusive bridging jack access to (XMT) and from (RCV) the HDSL span at the DSX-1 interface. Allows monitoring of the T1 payloads.
Craft port provisioning
To access all system maintenance, provisioning and performance screens, connect a standard 9-pin terminal cable between the serial port on a PC and the HLU craft port.
Retains the card in the shelf when pulled up; extracts the card when pulled down.
System option buttons (for manual setting of system parameters)
Use MODE and SEL to manually modify user options, initiate loopbacks, and display DSX-1 line parameters.
1 2 3 4
Press the MODE button for 3 seconds and release.
The front panel alternately displays the first
system parameter and its current setting. Press SEL to step through all possible system settings for the displayed parameter. Press MODE to update the parameter and advance to the next parameter. After scrolling through all the parameters, press SEL to confirm changes when prompted with a CONF YES message, or press MODE to cancel all changes.
Status LED
Reports the following conditions:
Self Test is in process or a Customer Remote Loopback (CREM) or Network Local Loopback (NLOC) is in effect.
Green LED Normal operation Flashing Green LED HDSL acquisition Red LED Fuse alarm Flashing Red LED System alarm Yellow LED
FlashingYellow LED System is in Armed (ARM) mode.
DSX-1
Front Panel
HIGAIN HLU 231
A5LB Special Loopback Commands
Inband Code Description 11000 . . . ARMING or NI LPBK (2-in-5 arming code) 11100 . . . IR LPDN or DISARM (3-5 disarming code) D3D3 IOR LPBK (NLOC and CREM 230-232 bit errors and 229-231 bit errors) C741 ILR-1 LPBK (NDU1 and CDU1 10 bit errors) C754 LR-20 LPBK (NDU2 and CDU2 200 bit errors) C743 ILR-3 LPBK (NDU3 and CDU3 30 bit errors) C744 ILR-4 LPBK (NDU4 and CDU4 40 bit errors) C742 ILR-2 LPBK (NREM and CLOC 20 bit errors)
For more information about the Maintenance Terminal screens, provisioning, and loopback mode testing, refer to the HLU-231 List 8D technical practice, document number 150-231-184-xx. It can be downloaded from the ADC Website at www.adc.com.
Front-panel Alarm Messages(a)
(a) ALRM displays prior to any alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description LOSW One of the HDSL loops has lost sync. LLOS No signal is detected at the DSX-1 input to the HLU. RLOS No signal is detected at the DS1 input to the HRU. BER A system Bit Error Rate alarm is in effect. MAL1 or MAL2 The margin on HDSL Loop 1 or 2 has dropped below the threshold (1 to 15 dB) setting. NONE No alarm present.
System Configuration Codes
Code Description VER xxxx The release revision of the firmware (appears during the System Settings review mode). LIST xxxx The model number of the product (appears during the System Settings review mode).
FRM xxxx Indicates the type of frame pattern being received from the DSX-1, where xxxx is SF,
ESF, UNFR, or NONE.
CODE xxxx The line code setting, where xxxx is Alternate Mark Inversion (AMI) or Bipolar with
8-Zero Substitution (B8ZS).
PLEV xxxx Indicates the HDSL line voltage in its LOW (-135 Vdc), HIGH (±112 Vdc), or DIS
(disabled) state.
To comply with the intrabuilding wiring requirements of GR-1089 CORE, Section 4.5.9, the shields of the ABAM-type cables that connectthe HLU-231 List 8D DSX-1 output ports to thecross-connect panel must be grounded at both ends.
Front Panel Diagnostic Messages
Message Description (normal operating messages in bold) 1=xx or 2=yy Indicates the power of the received HDSL signal on each loop relative to noise. Any value
of 06 dB or greater is adequate for reliable system operation.
ACQ1 or ACQ2 The multiplexers of the HLU and the HRU or the first doubler are trying to establish
synchronization over Loop 1 or Loop 2 of Span 1.
An L1 or An L2 The multiplexers of the two devices on Span nare trying to establish synchronization with
each other on Loop 1 or Loop 2, where nis the number of the span.
BAD RT? The HLU is not receiving any response from the HRU. FERR Framing bit error occurred at HLU DSX-1 input. H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error. n HDU Number (n) of doublers in the circuit.
INSL xxDB The maximum Insertion Loss message (INSL) appears followed by xxDB, where xx is the
maximum insertion in dB of all spans and loops.
LBPV A local bipolar violation has been received at the DSX-1 input to the HLU-231. MNGD The HLU is under control of the HMU-319 Network Management Unit. PWR FEED GND One of the HDSL loops has been grounded. PWR FEED ON Indicates that the HDSL loops are not grounded or shorted. PWR FEED OFF HDSL span power has been turned off. PWR FEED SHRT Indicates a short between the two HDSL pairs or the inability of the HRU to communicate
with the HLU.
SELF TEST The HLU is in a self-test mode. This occurs every power on/off cycle. SIG1 or SIG2 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.
Sn L1 or Sn L2 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.
System Setting Messages
Display Code Description (default values in bold) EQL (a)
(a) Can be configured using the MODE and SEL buttons on the HLU front panel as well as through the craft port..
Sets the DSX-1 Equalizer (EQL) to: EXT (replaces the Internal Equalizer with an External Equalizer), 0 (0 to 133 ft.), 133 (133 to 266 ft.), 266 (266 to 399 ft.), 399 (399 to 533 ft.), 533 (533 to 655 ft.).
LPBK Enables (ENA) or Disables (DIS) all inband SMJK loopback commands. SPLB Configures the system for generic inband loopback commands (GNLB) or special loopback
commands (A1LB, A2LB, A3LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage is -140 Vdc maximum. AUTO = automatically switches between -140 Vdc for non-doubler applications and ±112 Vdc for doubler applications. HIGH = ±112 Vdc for all applications.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10.
LBTO (a) Loopback timeout = NONE, 20, 60 or 120 minutes. ALM Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input. LNCD (a) Line code = places the HLU and HRU in B8ZS or AMI mode. SAIS Enables (ENA) or disables (DIS) transmission of AIS signal during NREM/SMJK loopbacks. MARG 0 to 15 dB (default = 4dB) RDA Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input. ALMP Enables a line to output an (AIS) payload of all ones or an (LOS) condition at its DS1 ports
for LOSW, DS1 LOS, and margin alarms.
RTPV Enables (ENA) provisioning at the remote (when remotely logged in) or disables (DIS)
provisioning at the remote.
BPVT Enables (ENA) or disables (DIS) Bipolar Violation Transparency (BPVT).

LOOPBACK TESTING
Initiate loopback testing from the HiGain maintenance menus or use the MODE and SEL
buttons. The hexidecimal inband codes shown below can be sent by a test set.
* Fuse alarm is normally floating and at -48 Vdc
when activated.
** System minor alarm contacts (pins 20 and 21) are
normally open and close upon alarm.
14
15
16
17
18
19
20
21
22
23
24
25
DS1 Tip Ground
Burn-in
DS1 Ring
Ground
DS1 Tip1
DS1 Ring1
39
40
41
42
43
44
45
46
47
48
49
50
-48V
1
2
3
4
5
6
7
8
9
10
11
HDSL2 Tip
HDSL2 Ring
FuseAlarm*
HDSL1 Tip1
HDSL1 Ring1
KEY KEY
26
27
28
29
30
31
32
33
34
35
36
37
38
12
13
Alarm**
NM Control Bus
Card-edge Connector
Modem settings
1200-9600 baud
8 data bits
No parity
1 stop bit
Hardware flow control:OFF
Terminal emulation software:VT-100
dB
MARGIN
HDSL
MODE SEL
RCV
BRG
XMT
L
SPAN
SPAN
BRG
DSX-1
R
S
2
3
2
SETUP
STATUS
Four-character display
DSX-1 test access jacks
CLEI and ECI
bar code label
List number
(HLU version
number)
Configuration number
Retaining latch
Displays status, provisioning, and
alarm messages. See table below
for a list of message descriptions.
SPAN
BRG
Provides splitting jack access to
(XMT) and from (RCV) the HDSL span
at the DSX-1 interface.
Provides non-intrusive bridging jack
access to (XMT) and from (RCV) the
HDSL span at the DSX-1 interface.
Allows monitoring of the T1 payloads.
Craft port provisioning
To access all system maintenance, provisioning
and performance screens, connect a standard
9-pin terminal cable between the serial port on a PC
and the HLU craft port.
Retains the card in the shelf
when pulled up; extracts the card
when pulled down.
System option buttons (for manual setting of
system parameters)
Use MODE and SEL to manually modify user options,
initiate loopbacks, and display DSX-1 line parameters.
1
2
3
4
Press the MODE button for 3 seconds and release.
The front panel alternately displays the first
system parameter and its current setting.
Press SEL to step through all possible system
settings for the displayed parameter.
Press MODE to update the parameter and advance
to the next parameter.
After scrolling through all the parameters, press SEL
to confirm changes when prompted with a CONF YES
message, or press MODE to cancel all changes.
Status LED
Reports the following conditions:
Self Test is in process or a Customer
Remote Loopback (CREM) or Network
Local Loopback (NLOC) is in effect.
Green LED Normal operation
Flashing Green LED HDSL acquisition
Red LED Fuse alarm
Flashing Red LED System alarm
Yellow LED
FlashingYellow LED System is in Armed (ARM) mode.
DSX-1
Front Panel
HIGAIN
HLU 231
A5LB Special Loopback Commands
Inband Code Description
11000 . . . ARMING or NI LPBK (2-in-5 arming code)
11100 . . . IR LPDN or DISARM (3-5 disarming code)
D3D3 IOR LPBK (NLOC and CREM 230-232 bit errors and 229-231 bit errors)
C741 ILR-1 LPBK (NDU1 and CDU1 10 bit errors)
C754 LR-20 LPBK (NDU2 and CDU2 200 bit errors)
C743 ILR-3 LPBK (NDU3 and CDU3 30 bit errors)
C744 ILR-4 LPBK (NDU4 and CDU4 40 bit errors)
C742 ILR-2 LPBK (NREM and CLOC 20 bit errors)
For more information about the Maintenance Terminal screens,
provisioning, and loopback mode testing, refer to the HLU-231 List 8D
technical practice, document number 150-231-184-xx. It can be
downloaded from the ADC Website at www.adc.com.
Front-panel Alarm Messages(a)
(a) ALRM displays prior to any alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description
LOSW One of the HDSL loops has lost sync.
LLOS No signal is detected at the DSX-1 input to the HLU.
RLOS No signal is detected at the DS1 input to the HRU.
BER A system Bit Error Rate alarm is in effect.
MAL1 or MAL2 The margin on HDSL Loop 1 or 2 has dropped below the threshold (1 to 15 dB) setting.
NONE No alarm present.
System Configuration Codes
Code Description
VER xxxx The release revision of the firmware (appears during the System Settings review mode).
LIST xxxx The model number of the product (appears during the System Settings review mode).
FRM xxxx Indicates the type of frame pattern being received from the DSX-1, where xxxx is SF,
ESF, UNFR, or NONE.
CODE xxxx The line code setting, where xxxx is Alternate Mark Inversion (AMI) or Bipolar with
8-Zero Substitution (B8ZS).
PLEV xxxx Indicates the HDSL line voltage in its LOW (-135 Vdc), HIGH (±112 Vdc), or DIS
(disabled) state.
To comply with the intrabuilding wiring requirements of GR-1089
CORE, Section 4.5.9, the shields of the ABAM-type cables that
connectthe HLU-231 List 8D DSX-1 output ports to thecross-connect
panel must be grounded at both ends.
Front Panel Diagnostic Messages
Message Description (normal operating messages in bold)
1=xx or 2=yy Indicates the power of the received HDSL signal on each loop relative to noise. Any value
of 06 dB or greater is adequate for reliable system operation.
ACQ1 or ACQ2 The multiplexers of the HLU and the HRU or the first doubler are trying to establish
synchronization over Loop 1 or Loop 2 of Span 1.
An L1 or An L2 The multiplexers of the two devices on Span nare trying to establish synchronization with
each other on Loop 1 or Loop 2, where nis the number of the span.
BAD RT? The HLU is not receiving any response from the HRU.
FERR Framing bit error occurred at HLU DSX-1 input.
H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error.
n HDU Number (n) of doublers in the circuit.
INSL xxDB The maximum Insertion Loss message (INSL) appears followed by xxDB, where xx is the
maximum insertion in dB of all spans and loops.
LBPV A local bipolar violation has been received at the DSX-1 input to the HLU-231.
MNGD The HLU is under control of the HMU-319 Network Management Unit.
PWR FEED GND One of the HDSL loops has been grounded.
PWR FEED ON Indicates that the HDSL loops are not grounded or shorted.
PWR FEED OFF HDSL span power has been turned off.
PWR FEED SHRT Indicates a short between the two HDSL pairs or the inability of the HRU to communicate
with the HLU.
SELF TEST The HLU is in a self-test mode. This occurs every power on/off cycle.
SIG1 or SIG2 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.
Sn L1 or Sn L2 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.
System Setting Messages
Display Code Description (default values in bold)
EQL (a)
(a) Can be configured using the MODE and SEL buttons on the HLU front panel as well as through the craft port..
Sets the DSX-1 Equalizer (EQL) to: EXT (replaces the Internal Equalizer with an External
Equalizer), 0 (0 to 133 ft.), 133 (133 to 266 ft.), 266 (266 to 399 ft.), 399 (399 to 533 ft.),
533 (533 to 655 ft.).
LPBK Enables (ENA) or Disables (DIS) all inband SMJK loopback commands.
SPLB Configures the system for generic inband loopback commands (GNLB) or special loopback
commands (A1LB, A2LB, A3LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage is -140 Vdc maximum.
AUTO = automatically switches between -140 Vdc for non-doubler applications and ±112
Vdc for doubler applications.
HIGH = ±112 Vdc for all applications.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10.
LBTO (a) Loopback timeout = NONE, 20, 60 or 120 minutes.
ALM Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input.
LNCD (a) Line code = places the HLU and HRU in B8ZS or AMI mode.
SAIS Enables (ENA) or disables (DIS) transmission of AIS signal during NREM/SMJK loopbacks.
MARG 0 to 15 dB (default = 4dB)
RDA Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input.
ALMP Enables a line to output an (AIS) payload of all ones or an (LOS) condition at its DS1 ports
for LOSW, DS1 LOS, and margin alarms.
RTPV Enables (ENA) provisioning at the remote (when remotely logged in) or disables (DIS)
provisioning at the remote.
BPVT Enables (ENA) or disables (DIS) Bipolar Violation Transparency (BPVT).

LOOPBACK TESTING
Initiate loopback testing from the HiGain maintenance menus or use the MODE and SEL
buttons. The hexidecimal inband codes shown below can be sent by a test set.
* Fuse alarm is normally floating and at -48 Vdc
when activated.
** System minor alarm contacts (pins 20 and 21) are
normally open and close upon alarm.
14
15
16
17
18
19
20
21
22
23
24
25
DS1 Tip Ground
Burn-in
DS1 Ring
Ground
DS1 Tip1
DS1 Ring1
39
40
41
42
43
44
45
46
47
48
49
50
-48V
1
2
3
4
5
6
7
8
9
10
11
HDSL2 Tip
HDSL2 Ring
FuseAlarm*
HDSL1 Tip1
HDSL1 Ring1
KEY KEY
26
27
28
29
30
31
32
33
34
35
36
37
38
12
13
Alarm**
NM Control Bus
Card-edge Connector
Modem settings
1200-9600 baud
8 data bits
No parity
1 stop bit
Hardware flow control:OFF
Terminal emulation software:VT-100
dB
MARGIN
HDSL
MODE SEL
RCV
BRG
XMT
L
SPAN
SPAN
BRG
DSX-1
R
S
2
3
2
SETUP
STATUS
Four-character display
DSX-1 test access jacks
CLEI and ECI
bar code label
List number
(HLU version
number)
Configuration number
Retaining latch
Displays status, provisioning, and
alarm messages. See table below
for a list of message descriptions.
SPAN
BRG
Provides splitting jack access to
(XMT) and from (RCV) the HDSL span
at the DSX-1 interface.
Provides non-intrusive bridging jack
access to (XMT) and from (RCV) the
HDSL span at the DSX-1 interface.
Allows monitoring of the T1 payloads.
Craft port provisioning
To access all system maintenance, provisioning
and performance screens, connect a standard
9-pin terminal cable between the serial port on a PC
and the HLU craft port.
Retains the card in the shelf
when pulled up; extracts the card
when pulled down.
System option buttons (for manual setting of
system parameters)
Use MODE and SEL to manually modify user options,
initiate loopbacks, and display DSX-1 line parameters.
1
2
3
4
Press the MODE button for 3 seconds and release.
The front panel alternately displays the first
system parameter and its current setting.
Press SEL to step through all possible system
settings for the displayed parameter.
Press MODE to update the parameter and advance
to the next parameter.
After scrolling through all the parameters, press SEL
to confirm changes when prompted with a CONF YES
message, or press MODE to cancel all changes.
Status LED
Reports the following conditions:
Self Test is in process or a Customer
Remote Loopback (CREM) or Network
Local Loopback (NLOC) is in effect.
Green LED Normal operation
Flashing Green LED HDSL acquisition
Red LED Fuse alarm
Flashing Red LED System alarm
Yellow LED
FlashingYellow LED System is in Armed (ARM) mode.
DSX-1
Front Panel
HIGAIN
HLU 231
A5LB Special Loopback Commands
Inband Code Description
11000 . . . ARMING or NI LPBK (2-in-5 arming code)
11100 . . . IR LPDN or DISARM (3-5 disarming code)
D3D3 IOR LPBK (NLOC and CREM 230-232 bit errors and 229-231 bit errors)
C741 ILR-1 LPBK (NDU1 and CDU1 10 bit errors)
C754 LR-20 LPBK (NDU2 and CDU2 200 bit errors)
C743 ILR-3 LPBK (NDU3 and CDU3 30 bit errors)
C744 ILR-4 LPBK (NDU4 and CDU4 40 bit errors)
C742 ILR-2 LPBK (NREM and CLOC 20 bit errors)
For more information about the Maintenance Terminal screens,
provisioning, and loopback mode testing, refer to the HLU-231 List 8D
technical practice, document number 150-231-184-xx. It can be
downloaded from the ADC Website at www.adc.com.
Front-panel Alarm Messages(a)
(a) ALRM displays prior to any alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description
LOSW One of the HDSL loops has lost sync.
LLOS No signal is detected at the DSX-1 input to the HLU.
RLOS No signal is detected at the DS1 input to the HRU.
BER A system Bit Error Rate alarm is in effect.
MAL1 or MAL2 The margin on HDSL Loop 1 or 2 has dropped below the threshold (1 to 15 dB) setting.
NONE No alarm present.
System Configuration Codes
Code Description
VER xxxx The release revision of the firmware (appears during the System Settings review mode).
LIST xxxx The model number of the product (appears during the System Settings review mode).
FRM xxxx Indicates the type of frame pattern being received from the DSX-1, where xxxx is SF,
ESF, UNFR, or NONE.
CODE xxxx The line code setting, where xxxx is Alternate Mark Inversion (AMI) or Bipolar with
8-Zero Substitution (B8ZS).
PLEV xxxx Indicates the HDSL line voltage in its LOW (-135 Vdc), HIGH (±112 Vdc), or DIS
(disabled) state.
To comply with the intrabuilding wiring requirements of GR-1089
CORE, Section 4.5.9, the shields of the ABAM-type cables that
connectthe HLU-231 List 8D DSX-1 output ports to thecross-connect
panel must be grounded at both ends.
Front Panel Diagnostic Messages
Message Description (normal operating messages in bold)
1=xx or 2=yy Indicates the power of the received HDSL signal on each loop relative to noise. Any value
of 06 dB or greater is adequate for reliable system operation.
ACQ1 or ACQ2 The multiplexers of the HLU and the HRU or the first doubler are trying to establish
synchronization over Loop 1 or Loop 2 of Span 1.
An L1 or An L2 The multiplexers of the two devices on Span nare trying to establish synchronization with
each other on Loop 1 or Loop 2, where nis the number of the span.
BAD RT? The HLU is not receiving any response from the HRU.
FERR Framing bit error occurred at HLU DSX-1 input.
H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error.
n HDU Number (n) of doublers in the circuit.
INSL xxDB The maximum Insertion Loss message (INSL) appears followed by xxDB, where xx is the
maximum insertion in dB of all spans and loops.
LBPV A local bipolar violation has been received at the DSX-1 input to the HLU-231.
MNGD The HLU is under control of the HMU-319 Network Management Unit.
PWR FEED GND One of the HDSL loops has been grounded.
PWR FEED ON Indicates that the HDSL loops are not grounded or shorted.
PWR FEED OFF HDSL span power has been turned off.
PWR FEED SHRT Indicates a short between the two HDSL pairs or the inability of the HRU to communicate
with the HLU.
SELF TEST The HLU is in a self-test mode. This occurs every power on/off cycle.
SIG1 or SIG2 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.
Sn L1 or Sn L2 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.
System Setting Messages
Display Code Description (default values in bold)
EQL (a)
(a) Can be configured using the MODE and SEL buttons on the HLU front panel as well as through the craft port..
Sets the DSX-1 Equalizer (EQL) to: EXT (replaces the Internal Equalizer with an External
Equalizer), 0 (0 to 133 ft.), 133 (133 to 266 ft.), 266 (266 to 399 ft.), 399 (399 to 533 ft.),
533 (533 to 655 ft.).
LPBK Enables (ENA) or Disables (DIS) all inband SMJK loopback commands.
SPLB Configures the system for generic inband loopback commands (GNLB) or special loopback
commands (A1LB, A2LB, A3LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage is -140 Vdc maximum.
AUTO = automatically switches between -140 Vdc for non-doubler applications and ±112
Vdc for doubler applications.
HIGH = ±112 Vdc for all applications.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10.
LBTO (a) Loopback timeout = NONE, 20, 60 or 120 minutes.
ALM Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input.
LNCD (a) Line code = places the HLU and HRU in B8ZS or AMI mode.
SAIS Enables (ENA) or disables (DIS) transmission of AIS signal during NREM/SMJK loopbacks.
MARG 0 to 15 dB (default = 4dB)
RDA Enables (ENA) or disables (DIS) alarm indications due to remote DS1 LOS at HRU input.
ALMP Enables a line to output an (AIS) payload of all ones or an (LOS) condition at its DS1 ports
for LOSW, DS1 LOS, and margin alarms.
RTPV Enables (ENA) provisioning at the remote (when remotely logged in) or disables (DIS)
provisioning at the remote.
BPVT Enables (ENA) or disables (DIS) Bipolar Violation Transparency (BPVT).

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
 Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to 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.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HLU-231 LIST 8D
The HiGain®HLU-231 List 8D Line Unit 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 in applications with or without HiGain Doubler Units
(HDUs).
FEATURES
SPECIFICATIONS
•Front panel status LED and four-character
status display •Payload (PL) or HiGain (HG) loopback source identification
•Ultra-low wander •Reduced power consumption
•Five-span range with four doublers
(60 kft, 24 AWG) •Low line-power option (-140 V) for circuits with a single doubler
•Selectable Power Feed modes •Bit Error Rate (BER) alarm options
•Loss of Signal (LOS)/Alarm Indicator
Signal (AIS) payload alarm option •Bipolar Violation Transparency (BPVT) options
•Additional screens for inventory and
troubleshooting •Grounded loop detection
Operating Temperature -40 °F to +149 °F (-40 °C to +65 °C)
Operating Humidity 5% to 95% non-condensing
HDSL Span Voltage -135 or ±112 Vdc
Mounting 220 mechanics shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB at 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
DS1 Line Rate 1.544 Mbps ±200 bps
DS1 Line Format Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution
(B8ZS)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF)
DSX-1 Pulse Output 6 V pk-pk, pre-equalized for 0 to 655 feet of ABAM cable
DSX-1 Input Level +1.5 to -7.5 dB DSX
INSTALLATION
To ensure proper installation of the HLU-231:
1Align the HLU-231 with the shelf rails and slide the unit in.
2When the HLU is properly seated, the retaining latch on the HLU snaps closed.
POWER-UP SEQUENCE
When the HLU powers up, the four-character display illuminates and reports status
messages.
If the HLU is not communicating with the next span device, the following occurs:
1Alarm and diagnostic messages display (see the Front Panel Alarm Messages and
Front Panel Diagnostic Messages tables inside), followed by the SELF TEST
message.
2The Status LED turns yellow, indicating it has entered self-test mode.
If the HLU is communicating with the next span device, the following occurs:
1The Status LED flashes green while acquiring each device in the system and turns
a steady green when the entire system is operating without any alarms.
2The four-character display reports margin (signal-to-noise ratio) readings and
insertion loss.
3If the status LED is not solid green, the display reports alarm conditions (see the
Front Panel Alarm Messages table inside).
PROVISIONING
1Access the Maintenance Terminal screens by pressing the several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the System Settings selection on the Main Menu to change the default
settings of any system parameters.
3Access the View Troubleshooting screen to view a graphical analysis of any
potential system problems.
When the HLU has been successfully installed and provisioned, clear the Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
H
I
G
AIN
HLU 231
HLU-231 LIST 8D
LINE UNIT
QUICK INSTALLATION
´,2<¶0•¨
1218280
October 8, 1999
Product Catalog: HLU-231-L8D
CLEI: T1L2BZ0A
Document: 350-231-184-06, Issue 6