PairGain HiGain Line Unit HLU-388 User manual

Corporate Office:
14402 Franklin Avenue
Tustin, CA 92780
Tel: [phone]
FAX: [phone]
For Technical Assistance:
800.638.0031
Product Number: 150-1141-51
HLU-388 List 5A Line Unit
Quick Installation Guide
HGIAIN
5A
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
PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of
60 months from the date of original shipment, given correct customer installation and regular maintenance.
PairGain will repair or replace at PairGain’s option any unit without cost during this period if the unit is found
to be defective for any reason other than abuse or incorrect use or installation.
Do not try to repair the unit. If it fails, replace it with another unit and return the faulty unit to PairGain for
repair. Any modifications of the unit by anyone other than an authorized PairGain representative voids the
warranty.
If a unit needs repair, call PairGain for a Return Material Authorization (RMA) number and return the defective
unit, freight prepaid, along with a brief description of the problem.
PairGain continues to repair faulty modules beyond the warranty program at a nominal charge. Contact your
PairGain sales representative for details and pricing.
Modifications
Any changes or modifications made to this device that are not expressly approved by PairGain Technologies,
Inc. may void 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
The HLU-388 List 5A has been tested and verified to comply with the applicable sections of the following
standards.
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements: Physical Protection
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
Trademark Information
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc. All 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
© Copyright 1999 PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies, Inc., and shall not be
modified, used, copied, reproduced or disclosed in whole or in part without the written consent of PairGain.
THE HLU-388 LIST 5A
The PairGain®HiGain®Line Unit HLU-388 List 5A 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 (American Wire Gauge) 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, 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 Vdc) 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 -140 or ±112 Vdc
Mounting DDM+ high-density shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB, 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), Bipolar with
8-Zero Substitution (B8ZS), or Zero Byte Time
Slot Interchange (ZBTSI)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF),
or Unframed (UNFR)
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-388 List 5A:
1Lift up the entire front panel and align the HLU-388 List 5A with the shelf rails.
2Slide the unit in and press the front panel down to secure.
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 red 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 several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the Systems 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.
4When the HLU is successfully installed and provisioned, clear Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
Section Number: 350-388-151-02
December 7, 1999

Corporate Office:
14402 Franklin Avenue
Tustin, CA 92780
Tel: [phone]
FAX: [phone]
For Technical Assistance:
800.638.0031
Product Number: 150-1141-51
HLU-388 List 5A Line Unit
Quick Installation Guide
HGIAIN
5A
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
PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of
60 months from the date of original shipment, given correct customer installation and regular maintenance.
PairGain will repair or replace at PairGain’s option any unit without cost during this period if the unit is found
to be defective for any reason other than abuse or incorrect use or installation.
Do not try to repair the unit. If it fails, replace it with another unit and return the faulty unit to PairGain for
repair. Any modifications of the unit by anyone other than an authorized PairGain representative voids the
warranty.
If a unit needs repair, call PairGain for a Return Material Authorization (RMA) number and return the defective
unit, freight prepaid, along with a brief description of the problem.
PairGain continues to repair faulty modules beyond the warranty program at a nominal charge. Contact your
PairGain sales representative for details and pricing.
Modifications
Any changes or modifications made to this device that are not expressly approved by PairGain Technologies,
Inc. may void 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
The HLU-388 List 5A has been tested and verified to comply with the applicable sections of the following
standards.
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements: Physical Protection
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
Trademark Information
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc. All 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
© Copyright 1999 PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies, Inc., and shall not be
modified, used, copied, reproduced or disclosed in whole or in part without the written consent of PairGain.
THE HLU-388 LIST 5A
The PairGain®HiGain®Line Unit HLU-388 List 5A 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 (American Wire Gauge) 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, 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 Vdc) 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 -140 or ±112 Vdc
Mounting DDM+ high-density shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB, 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), Bipolar with
8-Zero Substitution (B8ZS), or Zero Byte Time
Slot Interchange (ZBTSI)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF),
or Unframed (UNFR)
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-388 List 5A:
1Lift up the entire front panel and align the HLU-388 List 5A with the shelf rails.
2Slide the unit in and press the front panel down to secure.
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 red 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 several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the Systems 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.
4When the HLU is successfully installed and provisioned, clear Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
Section Number: 350-388-151-02
December 7, 1999

Corporate Office:
14402 Franklin Avenue
Tustin, CA 92780
Tel: [phone]
FAX: [phone]
For Technical Assistance:
800.638.0031
Product Number: 150-1141-51
HLU-388 List 5A Line Unit
Quick Installation Guide
HGIAIN
5A
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
PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of
60 months from the date of original shipment, given correct customer installation and regular maintenance.
PairGain will repair or replace at PairGain’s option any unit without cost during this period if the unit is found
to be defective for any reason other than abuse or incorrect use or installation.
Do not try to repair the unit. If it fails, replace it with another unit and return the faulty unit to PairGain for
repair. Any modifications of the unit by anyone other than an authorized PairGain representative voids the
warranty.
If a unit needs repair, call PairGain for a Return Material Authorization (RMA) number and return the defective
unit, freight prepaid, along with a brief description of the problem.
PairGain continues to repair faulty modules beyond the warranty program at a nominal charge. Contact your
PairGain sales representative for details and pricing.
Modifications
Any changes or modifications made to this device that are not expressly approved by PairGain Technologies,
Inc. may void 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
The HLU-388 List 5A has been tested and verified to comply with the applicable sections of the following
standards.
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements: Physical Protection
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
Trademark Information
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc. All 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
© Copyright 1999 PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies, Inc., and shall not be
modified, used, copied, reproduced or disclosed in whole or in part without the written consent of PairGain.
THE HLU-388 LIST 5A
The PairGain®HiGain®Line Unit HLU-388 List 5A 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 (American Wire Gauge) 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, 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 Vdc) 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 -140 or ±112 Vdc
Mounting DDM+ high-density shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB, 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), Bipolar with
8-Zero Substitution (B8ZS), or Zero Byte Time
Slot Interchange (ZBTSI)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF),
or Unframed (UNFR)
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-388 List 5A:
1Lift up the entire front panel and align the HLU-388 List 5A with the shelf rails.
2Slide the unit in and press the front panel down to secure.
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 red 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 several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the Systems 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.
4When the HLU is successfully installed and provisioned, clear Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
Section Number: 350-388-151-02
December 7, 1999

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.
GNLB Loopback Commands
Loopback Inband Code Description NLOC 1111000 DSX-1 signal is looped back to the network at the HLU. NDU1 110000 DSX-1 signal is looped back to the network at the HDU1. NDU2 111000 DSX-1 signal is looped back to the network at the HDU2. NDU3 1010001 DSX-1 signal is looped back to the network at the HDU3. NDU4 1010010 DSX-1 signal is looped back to the network at the HDU4. NREM 1110000 DSX-1 signal is looped back to the network at the HRU. SMJK 11000 DSX-1 signal is looped back to the network at the HRU SmartJack
module.
CLOC 1111100 Signal from customer is looped back to the customer at the HLU. CDU1 111100 Signal from customer is looped back to the customer at the HDU1. CDU2 111110 Signal from customer is looped back to the customer at the HDU2. CDU3 1011001 Signal from customer is looped back to the customer at the HDU3. CDU4 1011010 Signal from customer is looped back to the customer at the HDU4. CREM 1111110 Signal from customer is looped back to the customer at the HRU. Loopdown 11100 Deactivates any of the above loopbacks.
For more detailed information about the Maintenance Terminal screens, provisioning, and loopback mode testing, refer to the HLU-388 List 5A technical practice, document number 150-388-151-xx. It can be downloaded from the Customer Site portion of the PairGain Web page at www.pairgain.com. A password is
required to access the Customer Site Web pages. If you do not have a password, contact your PairGain sales representative.
Front-Panel Alarm Messages(a)
(a) Alarm (ALRM) displays prior to an alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description LOSW Indicates that one of the HDSL loops has lost sync. LLOS Indicates that no signal is detected at the DSX-1 input to the HLU. RLOS Indicates that no signal is detected at the DS-1 input to the HRU. BER A system Bit Error Rate alarm is in effect. MAL1 or MAL2 The margin on HDSL Loop 1 or Loop 2 has dropped below the threshold set by the user. 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 (-140 Vdc), HIGH (±112 Vdc), or DIS
(disabled).
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.
AnL1 or AnL2 The multiplexers ofthe two deviceson Spannare 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. DSO NONE = no DSO channels blocked. BLK = some channels blocked. FERR Framing bit error occurred at HLU DSX-1 input. H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error. nHDU Indicates the number (n) of doublers in the circuit (if any are present).
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-388 List 5A. 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.
SnL1 or SnL2 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 HRU is in a logic loopback state caused by a loss of its T1 input from the CI.
System Settings
Display Code Description (default values in bold) EQL Sets the Equalizer (EQL) DSX-1 to: 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, A4LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage at -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.
ZBTS ON = ESF frame is operating in its Zero-Byte Time Slot Interchange (ZBTSI) mode.
OFF = ESF frame is operating in its normal non-ZBTSI mode.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10-6 or 10- 7, respectively.
LBTO Loopback timeout = NONE, 20, 60, 120 minutes. DS1 Line code = , AUTO, B8ZS, or AMI. FRMG Framing = AUTO or UNFR (unframed). HAIS Transmits the AIS signal at the HLU and HRU output ports if one (1LP) or both (2LP) HDSL
loops are not in sync.
SAIS Enables (ENA) or disables (DIS) NREM/SMJK loopback mode. DSO DSO blocking on (BLK) or off (NONE); can only be set through the Maintenance Terminal. MARG 0 to 15 dB; default is 4dB; can only be set through the Maintenance Terminal. RDA Enables (ENA) or disables (DIS) remote DS1 LOS at HRU input. ALMP Enables line to output an (AIS) payload or an (LOS) condition. RTPV Enables (ENA) or disables (DIS) remote provisioning. BPVT Enables (ENA) or disables (DIS) bipolar violation transparency (BVP). CONF YES = confirms that all operating modes are to be updated to their current selections.
NO = prevents the most recently selected operating mode selection from being updated.

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.
GNLB Loopback Commands
Loopback Inband Code Description
NLOC 1111000 DSX-1 signal is looped back to the network at the HLU.
NDU1 110000 DSX-1 signal is looped back to the network at the HDU1.
NDU2 111000 DSX-1 signal is looped back to the network at the HDU2.
NDU3 1010001 DSX-1 signal is looped back to the network at the HDU3.
NDU4 1010010 DSX-1 signal is looped back to the network at the HDU4.
NREM 1110000 DSX-1 signal is looped back to the network at the HRU.
SMJK 11000 DSX-1 signal is looped back to the network at the HRU SmartJack
module.
CLOC 1111100 Signal from customer is looped back to the customer at the HLU.
CDU1 111100 Signal from customer is looped back to the customer at the HDU1.
CDU2 111110 Signal from customer is looped back to the customer at the HDU2.
CDU3 1011001 Signal from customer is looped back to the customer at the HDU3.
CDU4 1011010 Signal from customer is looped back to the customer at the HDU4.
CREM 1111110 Signal from customer is looped back to the customer at the HRU.
Loopdown 11100 Deactivates any of the above loopbacks.
For more detailed information about the Maintenance Terminal
screens, provisioning, and loopback mode testing, refer to the
HLU-388 List 5A technical practice, document number
150-388-151-xx. It can be downloaded from the Customer Site portion
of the PairGain Web page at www.pairgain.com. A password is
required to access the Customer Site Web pages. If you do not have
a password, contact your PairGain sales representative.
Front-Panel Alarm Messages(a)
(a) Alarm (ALRM) displays prior to an alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description
LOSW Indicates that one of the HDSL loops has lost sync.
LLOS Indicates that no signal is detected at the DSX-1 input to the HLU.
RLOS Indicates that no signal is detected at the DS-1 input to the HRU.
BER A system Bit Error Rate alarm is in effect.
MAL1 or MAL2 The margin on HDSL Loop 1 or Loop 2 has dropped below the threshold set by the user.
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 (-140 Vdc), HIGH (±112 Vdc), or DIS
(disabled).
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.
AnL1 or AnL2 The multiplexers ofthe two deviceson Spannare 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.
DSO NONE = no DSO channels blocked. BLK = some channels blocked.
FERR Framing bit error occurred at HLU DSX-1 input.
H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error.
nHDU Indicates the number (n) of doublers in the circuit (if any are present).
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-388 List 5A.
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.
SnL1 or SnL2 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 HRU is in a logic loopback state caused by a loss of its T1 input from the CI.
System Settings
Display Code Description (default values in bold)
EQL Sets the Equalizer (EQL) DSX-1 to: 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, A4LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage at -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.
ZBTS ON = ESF frame is operating in its Zero-Byte Time Slot Interchange (ZBTSI) mode.
OFF = ESF frame is operating in its normal non-ZBTSI mode.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10-6 or 10- 7, respectively.
LBTO Loopback timeout = NONE, 20, 60, 120 minutes.
DS1 Line code = , AUTO, B8ZS, or AMI.
FRMG Framing = AUTO or UNFR (unframed).
HAIS Transmits the AIS signal at the HLU and HRU output ports if one (1LP) or both (2LP) HDSL
loops are not in sync.
SAIS Enables (ENA) or disables (DIS) NREM/SMJK loopback mode.
DSO DSO blocking on (BLK) or off (NONE); can only be set through the Maintenance Terminal.
MARG 0 to 15 dB; default is 4dB; can only be set through the Maintenance Terminal.
RDA Enables (ENA) or disables (DIS) remote DS1 LOS at HRU input.
ALMP Enables line to output an (AIS) payload or an (LOS) condition.
RTPV Enables (ENA) or disables (DIS) remote provisioning.
BPVT Enables (ENA) or disables (DIS) bipolar violation transparency (BVP).
CONF YES = confirms that all operating modes are to be updated to their current selections.
NO = prevents the most recently selected operating mode selection from being updated.

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.
GNLB Loopback Commands
Loopback Inband Code Description
NLOC 1111000 DSX-1 signal is looped back to the network at the HLU.
NDU1 110000 DSX-1 signal is looped back to the network at the HDU1.
NDU2 111000 DSX-1 signal is looped back to the network at the HDU2.
NDU3 1010001 DSX-1 signal is looped back to the network at the HDU3.
NDU4 1010010 DSX-1 signal is looped back to the network at the HDU4.
NREM 1110000 DSX-1 signal is looped back to the network at the HRU.
SMJK 11000 DSX-1 signal is looped back to the network at the HRU SmartJack
module.
CLOC 1111100 Signal from customer is looped back to the customer at the HLU.
CDU1 111100 Signal from customer is looped back to the customer at the HDU1.
CDU2 111110 Signal from customer is looped back to the customer at the HDU2.
CDU3 1011001 Signal from customer is looped back to the customer at the HDU3.
CDU4 1011010 Signal from customer is looped back to the customer at the HDU4.
CREM 1111110 Signal from customer is looped back to the customer at the HRU.
Loopdown 11100 Deactivates any of the above loopbacks.
For more detailed information about the Maintenance Terminal
screens, provisioning, and loopback mode testing, refer to the
HLU-388 List 5A technical practice, document number
150-388-151-xx. It can be downloaded from the Customer Site portion
of the PairGain Web page at www.pairgain.com. A password is
required to access the Customer Site Web pages. If you do not have
a password, contact your PairGain sales representative.
Front-Panel Alarm Messages(a)
(a) Alarm (ALRM) displays prior to an alarm message. Pressing the SEL button initiates an Alarm Cutoff (ACO)
message.
Message Description
LOSW Indicates that one of the HDSL loops has lost sync.
LLOS Indicates that no signal is detected at the DSX-1 input to the HLU.
RLOS Indicates that no signal is detected at the DS-1 input to the HRU.
BER A system Bit Error Rate alarm is in effect.
MAL1 or MAL2 The margin on HDSL Loop 1 or Loop 2 has dropped below the threshold set by the user.
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 (-140 Vdc), HIGH (±112 Vdc), or DIS
(disabled).
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.
AnL1 or AnL2 The multiplexers ofthe two deviceson Spannare 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.
DSO NONE = no DSO channels blocked. BLK = some channels blocked.
FERR Framing bit error occurred at HLU DSX-1 input.
H1ES or H2ES HDSL Loop 1 or Loop 2 CRC error.
nHDU Indicates the number (n) of doublers in the circuit (if any are present).
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-388 List 5A.
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.
SnL1 or SnL2 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 HRU is in a logic loopback state caused by a loss of its T1 input from the CI.
System Settings
Display Code Description (default values in bold)
EQL Sets the Equalizer (EQL) DSX-1 to: 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, A4LB, A5LB).
PWRF DIS = disables HDSL powering.
LOW = HDSL line voltage at -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.
ZBTS ON = ESF frame is operating in its Zero-Byte Time Slot Interchange (ZBTSI) mode.
OFF = ESF frame is operating in its normal non-ZBTSI mode.
BERT NONE = prevents generation of a system alarm due to excessive BER.
1E-6 or 1E-7 = alarm activates when BER threshold exceeds 10-6 or 10- 7, respectively.
LBTO Loopback timeout = NONE, 20, 60, 120 minutes.
DS1 Line code = , AUTO, B8ZS, or AMI.
FRMG Framing = AUTO or UNFR (unframed).
HAIS Transmits the AIS signal at the HLU and HRU output ports if one (1LP) or both (2LP) HDSL
loops are not in sync.
SAIS Enables (ENA) or disables (DIS) NREM/SMJK loopback mode.
DSO DSO blocking on (BLK) or off (NONE); can only be set through the Maintenance Terminal.
MARG 0 to 15 dB; default is 4dB; can only be set through the Maintenance Terminal.
RDA Enables (ENA) or disables (DIS) remote DS1 LOS at HRU input.
ALMP Enables line to output an (AIS) payload or an (LOS) condition.
RTPV Enables (ENA) or disables (DIS) remote provisioning.
BPVT Enables (ENA) or disables (DIS) bipolar violation transparency (BVP).
CONF YES = confirms that all operating modes are to be updated to their current selections.
NO = prevents the most recently selected operating mode selection from being updated.

Corporate Office:
14402 Franklin Avenue
Tustin, CA 92780
Tel: [phone]
FAX: [phone]
For Technical Assistance:
800.638.0031
Product Number: 150-1141-51
HLU-388 List 5A Line Unit
Quick Installation Guide
HGIAIN
5A
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
PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of
60 months from the date of original shipment, given correct customer installation and regular maintenance.
PairGain will repair or replace at PairGain’s option any unit without cost during this period if the unit is found
to be defective for any reason other than abuse or incorrect use or installation.
Do not try to repair the unit. If it fails, replace it with another unit and return the faulty unit to PairGain for
repair. Any modifications of the unit by anyone other than an authorized PairGain representative voids the
warranty.
If a unit needs repair, call PairGain for a Return Material Authorization (RMA) number and return the defective
unit, freight prepaid, along with a brief description of the problem.
PairGain continues to repair faulty modules beyond the warranty program at a nominal charge. Contact your
PairGain sales representative for details and pricing.
Modifications
Any changes or modifications made to this device that are not expressly approved by PairGain Technologies,
Inc. may void 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
The HLU-388 List 5A has been tested and verified to comply with the applicable sections of the following
standards.
 GR 63-CORE - Network Equipment-Building System (NEBS) Requirements: Physical Protection
 GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
Trademark Information
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc. All 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
© Copyright 1999 PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies, Inc., and shall not be
modified, used, copied, reproduced or disclosed in whole or in part without the written consent of PairGain.
THE HLU-388 LIST 5A
The PairGain®HiGain®Line Unit HLU-388 List 5A 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 (American Wire Gauge) 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, 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 Vdc) 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 -140 or ±112 Vdc
Mounting DDM+ high-density shelf
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB, 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), Bipolar with
8-Zero Substitution (B8ZS), or Zero Byte Time
Slot Interchange (ZBTSI)
DS1 Frame Format Extended SuperFrame (ESF), SuperFrame (SF),
or Unframed (UNFR)
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-388 List 5A:
1Lift up the entire front panel and align the HLU-388 List 5A with the shelf rails.
2Slide the unit in and press the front panel down to secure.
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 red 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 several times.
aSet the date and time (select Set Clock from the Main Menu).
bSet the circuit IDs (select View System Inventory).
2Access the Systems 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.
4When the HLU is successfully installed and provisioned, clear Span Status,
Performance Data, Performance History, and Alarm History screens to ensure
accurate data and alarm reporting.
Continued
SPACEBAR
Þ
Section Number: 350-388-151-02
December 7, 1999