ADC HiGain HLU-432 User Manual
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ADC HiGain HLU-432 User Manual

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HiGain
HLU-432 L1
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SETUP
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HiGain Line Unit
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HLU-432 List 1
STATUS
Part Number: 150-2248-01
CLEI Code: T1L4JLGB
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ANUAL

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  • Page 1 ANUAL HiGain HLU-432 L1 dB ) SETUP HiGain Line Unit HLU-432 List 1 STATUS Part Number: 150-2248-01 CLEI Code: T1L4JLGB RS-232...
  • Page 2 Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and ADC further disclaims any and all liability for indirect, incidental, special, consequential or other similar damages.
  • Page 3 Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short or irregular, contact ADC as described in the Warranty located inside the back cover. If you must store the equipment for a prolonged period, store the equipment in its original container.
  • Page 4 Inspecting Shipment 150-432-100-02 July 18, 2002 HLU-432 List 1...

  • Page 5: Table Of Contents

    150-432-100-02, Revision 02 Table of Contents ABLE OF ONTENTS Overview ____________________________________________________________________________ 1 Features ..............................1 Product Enhancements ......................1 Standard Features ........................1 Compatibility .............................2 Applications ............................2 HiGain Doubler Applications ....................2 Front Panel __________________________________________________________________________ 3 Installation___________________________________________________________________________ 7 Verification ............................8 Verification without a Downstream Device ................8 Verification with a Downstream Device ................8 Provisioning Requirements ........................9 Provisioning_________________________________________________________________________ 10...
  • Page 6 Table of Contents 150-432-100-02, Revision 02 Retiring System Alarms ....................40 Self Test ..........................40 Loopback Operation ........................41 Generic Loopback Commands..................41 Special Loopback Commands................... 43 Initiating a Manual Loopback Session................44 Loopback Test Procedures ......................45 General Troubleshooting Tips ..................45 GNLB Test Procedures .....................
  • Page 7 150-432-100-02, Revision 02 List of Figures IST OF IGURES 1. HLU-432 List 1 Front Panel..........................3 2. Installing the HLU-432 List 1 into a Shelf......................7 3. Maintenance Terminal Main Menu .......................13 4. System Spans..............................14 5. Span Status Screen: No Doubler ........................15 6.
  • Page 8 List of Tables 150-432-100-02, Revision 02 IST OF ABLES 1. Front-Panel Description ........................... 4 2. Front-Panel Display Messages......................... 5 3. Navigational Keys on the Maintenance Terminal ..................12 4. Maintenance Terminal Screens........................13 5. Span Status Fields and Descriptions ......................16 6.

  • Page 9: Overview

    Overview VERVIEW ® ® The ADC HiGain Line Unit HLU-432 List 1 is the Central Office (CO) side of a repeaterless T1 transmission system. When used in conjunction with a HiGain Remote Unit (HRU), the system provides 1.544 Mbps transmission on two unconditioned copper pairs over the full Carrier Service Area (CSA) range. The CSA includes loops up to 12,000 feet of 24 AWG or 9,000 feet of 26 AWG wire, including bridged taps.

  • Page 10: Compatibility

    Overview 150-432-100-02, Revision 02 • Full-duplex 2B1Q HDSL transmission on two pairs at 784 kbps • Margin threshold alarm OMPATIBILITY The HLU-432 is designed to mount in 200 or 400 mechanics shelves. For a list of compatible shelves, see “Appendix C - Compatibility” on page All generations of HiGain HLU and HRU modules are compatible with each other.

  • Page 11: Front Panel

    150-432-100-02, Revision 02 Front Panel RONT ANEL The HLU-432 front panel is shown in Figure 1. The front-panel components are described in Table 1. For pinout diagrams of the HLU card-edge connector and the craft port, refer to “Appendix A - Specifications” on page HiGain List number HLU-432 L1...
  • Page 12 Front Panel 150-432-100-02, Revision 02 Table 1. Front-Panel Description Front-panel Feature Function Front-panel display Displays four-character status, provisioning, and alarm system messages.The front-panel display illuminates when power is initially applied. To conserve power the display only remains on for 4 minutes. Using the MODE or SEL buttons reactivates the display and restarts the 4-minute timer. Refer to Table 2 on page 5 for a listing of the four-character messages.

  • Page 13: Front-Panel Display Messages

    150-432-100-02, Revision 02 Front Panel Table 2 lists the front-panel display messages. The four-character panel display reports the code of a pertinent alarm, loopback or diagnostic message, in some cases followed by a second four-character message that modifies the first message with a value or current configuration setting. Table 2.
  • Page 14 Front Panel 150-432-100-02, Revision 02 Table 2. Front-Panel Display Messages (Cont.) Message Full Name Description DS0 Blocked Channels Indicates status of DS0 blocked channels. NONE indicates no channels are blocked. BLK indicates some channels are blocked. FERR Framing Bit Error Framing bit error occurred at HLU T1 input.

  • Page 15: Installation

    NSTALLATION Upon receipt of the equipment, visually inspect the contents for signs of damage. If the equipment has been damaged in transit, immediately report the extent of damage to the transportation company and to ADC. 200-mechanics enclosure H iG a in...

  • Page 16: Verification

    Installation 150-432-100-02, Revision 02 ERIFICATION Once the HLU-432 is installed, verify that it is operating properly. To do this, you need to monitor the following: • Status LED • Status messages reported by the front-panel display (see Table 2 on page Verification without a Downstream Device If there is no downstream device installed: Verify that the HLU powers up.

  • Page 17: Provisioning Requirements

    150-432-100-02, Revision 02 Installation ROVISIONING EQUIREMENTS Refer to “Provisioning” on page 10 for information about using the MODE and SEL buttons or the Maintenance Terminal screens to configure the HLU. While the MODE and SEL buttons can be used to manually accomplish some provisioning tasks, such as setting system options, the Maintenance Terminal screens (available when you connect a PC to the craft port) can handle all provisioning tasks.

  • Page 18: Provisioning

    Provisioning 150-432-100-02, Revision 02 ROVISIONING This is a reference section for HLU provisioning. There are two methods for provisioning the HLU-432: • Use the MODE and SEL buttons on the front panel of the HLU to: – set system options –...

  • Page 19: Resetting To Factory Default Values

    150-432-100-02, Revision 02 Provisioning Resetting to Factory Default Values All user options (Table 8 on page 20) can be set to the factory default values using the MODE and SEL buttons. To set the user options to their default values: Press the SEL button for six seconds until the following message appears: DFLT NO Press the SEL button while the DFLT NO message is displayed.

  • Page 20: Using A Maintenance Terminal

    Provisioning 150-432-100-02, Revision 02 SING A AINTENANCE ERMINAL Connecting to a Maintenance Terminal The craft port on the front panel allows you to connect the HLU-432 to a maintenance terminal (ASCII terminal or PC running a terminal emulation program). Once connected to a maintenance terminal, you can access the maintenance, provisioning, and performance screens.

  • Page 21: Maintenance Terminal Main Menu

    150-432-100-02, Revision 02 Provisioning Maintenance Terminal Main Menu Figure 3 shows the Maintenance Terminal Main Menu from which you can access system administration screens. The function of each screen selection is listed in Table 4. To access a screen, press the letter shown next to the menu item.

  • Page 22: Using The Maintenance Terminal Screens

    Provisioning 150-432-100-02, Revision 02 Selecting a Maintenance Terminal Function To perform a function within the Maintenance Terminal screens, you can: • Press the key indicated to the left of the selection. • Press the letter in parentheses for the parameter to be changed. System Spans As shown in Figure...

  • Page 23: Span Status Screen: No Doubler

    150-432-100-02, Revision 02 Provisioning Span Status Screen without Doublers SPAN STATUS TIME: 01:04:00 DATE: 04/13/00 CIRCUIT ID#: ALARMS: NONE LOOPBACK: OFF POWER LEVEL: DISABLED HDSL-1 HDSL-2 HDSL-1 HDSL-2 cur/min/max cur/min/max cur/min/max cur/min/max MARGIN: 23/23/25 24/23/25 23/22/25 23/22/24 dB PULSE ATTN: INS LOSS: 24 HOUR ES: 00000...

  • Page 24: Span Status Fields And Descriptions

    Provisioning 150-432-100-02, Revision 02 Table 5 lists the Span Status fields and descriptions. Table 6 Table 7 on page 17 describe alarm and loopback messages displayed on the Span Status screens. Table 5. Span Status Fields and Descriptions Span Status Field Description Time Time of day when Span Status was checked.

  • Page 25: Hdsl System Alarms

    150-432-100-02, Revision 02 Provisioning Table 6. HDSL System Alarms Message Name Description Bit Error Rate The Total System Error Count (TSEC) has exceeded the user-selected threshold. LOSW Loss of Sync Word One of the HDSL loops has lost synchronization. LLOS Local Loss of Signal No signal from HLU-432 local T1 input.

  • Page 26: Set Clock Screen

    Provisioning 150-432-100-02, Revision 02 Set Clock Screen Press at the Maintenance Terminal Main Menu to open the Set Clock screen (Figure SET CLOCK TIME: 00:03:32 DATE: 04/13/00 CIRCUIT ID#: Format: HH:MM MM/DD/YY NEW TIME: 10:10 NEW DATE: 4/14/00 (U)PDATE REMOTE? Figure 7.

  • Page 27: System Settings Screen

    150-432-100-02, Revision 02 Provisioning System Settings Screen The options set from the System Settings screen are the same as the options set through the HLU-432 Mode and SEL buttons on the front panel. The exceptions are Margin Alarm Threshold and DS0 Blocking, which can only be set at this screen.
  • Page 28 Provisioning 150-432-100-02, Revision 02 Table 8 describes the System Settings options and lists the corresponding front-panel display codes. Factory default parameters appear in boldface type. Table 8. HLU-432 List 1 System Settings Front-Panel System Settings Display Parameter Description Screen Options Code Equalization Sets the Equalizer to DSX-1 for 0 to 132 feet.
  • Page 29 150-432-100-02, Revision 02 Provisioning Table 8. HLU-432 List 1 System Settings (Cont.) Front-Panel System Settings Display Parameter Description Screen Options Code DS1 Line Code AUTO The HLU and HRU monitor the incoming T1 bit streams for the B8ZS line code. If the HRU detects this code, the HLU enters B8ZS output mode.
  • Page 30 Provisioning 150-432-100-02, Revision 02 Table 8. HLU-432 List 1 System Settings (Cont.) Front-Panel System Settings Display Parameter Description Screen Options Code Bipolar Violation BPVT Enables BPVs and HDSL CRC errors at the T1 input to be converted into T1 Transparency BPVs at the distant end’s T1 output.
  • Page 31 150-432-100-02, Revision 02 Provisioning • BER option = 1E-7. Alarm is generated if TSEC > 9 Once initiated, the alarm clears when the TSEC drops below its associated threshold count. For dribbling errors, the alarm can come and go in intervals as short as one second. Alarms due to bursty impulse noise transients usually require the full 60 seconds or longer to clear depending on the frequency of the transients.
  • Page 32 Provisioning 150-432-100-02, Revision 02 Margin Alarm Threshold Option To set the Margin Alarm Threshold: Select from the System Settings Main Menu screen. Enter the desired minimum acceptable alarm threshold from the 0 to 15 dB range. This causes a system alarm to occur if either the margin on HDSL Loop 1 (MAL1) or Loop 2 (MAL2) drops below the selected threshold value.

  • Page 33: Loopback Mode Screen

    150-432-100-02, Revision 02 Provisioning Loopback Mode Screen The Loopback Menu permits you to issue loopbacks to the HiGain system. Depending upon the number of doublers, there can be up to five loopback screens. Press from the Maintenance Terminal Main Menu to display the Loopback Menu. Figure 9 shows an example of a Loopback Menu when no doublers are present;...

  • Page 34: Loopback Menu: Four Doublers

    Provisioning 150-432-100-02, Revision 02 Loopback Menu without Doubler LOOPBACK MENU TIME: 00:15:34 DATE: 04/05/00 CIRCUIT ID#: A. DISABLE LOOPBACKS B. NETWORK LOOP HLU (NLOC) C. NETWORK LOOP HRU (NREM) G. CUSTOMER LOOP HLU (CREM) H. CUSTOMER LOOP HRU (CLOC) (E)xit Figure 9.
  • Page 35 150-432-100-02, Revision 02 Provisioning Initiating a Loopback To send one of the available loopbacks, press the appropriate letter in the Loopback Menu. The following prompt appears: PLEASE WAIT....A series of dots moves from left to right indicating that the command has been issued. When this process completes, the system returns to the Maintenance Terminal Main Menu.

  • Page 36: View Performance Data Screen

    Provisioning 150-432-100-02, Revision 02 View Performance Data Screen The Performance Data screen shows the Errored (ES) and Unavailable Seconds (UAS) for both HDSL loops and each T1 input at 15-minute intervals over a 4-hour time interval. (The ES and UAS data is separated by a slash mark.) Earlier and later data, in 4-hour time periods on different span screens, can be accessed by pressing (Previous) or (Next), respectively.

  • Page 37: Performance Data Screen: No Doubler

    150-432-100-02, Revision 02 Provisioning Performance Data Screen without Doubler Figure 12 shows a single non-doubler span. This screen shows the Errored and Unavailable Seconds for the HDSL span between the HLU-432 and the HRU. Date: 04/05/00 PERFORMANCE DATA CIRCUIT ID#: ERRORED SECONDS/UNAVAILABLE SECONDS HDSL-1 HDSL-2...

  • Page 38: View Performance History Screen

    Provisioning 150-432-100-02, Revision 02 View Performance History Screen The Performance History screen shows the daily occurrences of ES and UAS over a 31-day period in 24-hour increments. Errored Seconds and Unavailable Seconds for both HDSL loops and each of the two DS1 inputs are listed for the current and previous period.

  • Page 39: Day Performance History Screen: Four Doublers (Span 5)

    150-432-100-02, Revision 02 Provisioning Performance History Screen for Doubler Applications The Performance History screen displays information by span when doublers are present. With multiple doublers (up to four), there can be as many as five span screens. Time: 00:26:29 SPAN 5 PERFORMANCE HISTORY - 31 DAY CIRCUIT ID#: ERRORED SECONDS/UNAVAILABLE SECONDS HDSL-1...

  • Page 40: View Alarm History Screen

    Provisioning 150-432-100-02, Revision 02 View Alarm History Screen Press at the Maintenance Terminal Main Menu to open the Alarm History screen. This screen allows you to view alarms that are currently active. In the Alarm History screen (Figure 16 Figure 17 on page 33) the: •...

  • Page 41: Alarm History Screen: No Doubler

    150-432-100-02, Revision 02 Provisioning Alarm History Screen without Doubler ALARM HISTORY TIME: 00:27:54 DATE: 04/07/00 CIRCUIT ID#: Type First Last Current Count LOS, DS1-HLU LOS, DS1-HRU SPAN1 LOSW, HDSL1 02/01/00-00:00 02/01/00-00:00 SPAN1 LOSW, HDSL2 02/01/00-00:00 02/01/00-00:00 SPAN1 MARGIN L1 SPAN1 MARGIN L2 PWR-SHRT PWR-GND LAST CLEARED: NONE...

  • Page 42: View System Inventory Screen

    Provisioning 150-432-100-02, Revision 02 View System Inventory Screen The System Inventory screen (Figure 18 on page 35) lists the six possible units that can comprise one HiGain circuit: one HLU, one HRU, and up to four doublers. The information in the System Inventory Screen is presented as follows: •...

  • Page 43: System Inventory Screen: No Doubler

    150-432-100-02, Revision 02 Provisioning System Inventory Screen without Doubler SYSTEM INVENTORY TIME: 11:03:38 DATE: 04/14/00 A. CIRCUIT ID: UNIT PRODUCT CLEI UNIT ID HLU-432 V7.3 T1L4JLGB NOT REQUIRED B. HRU HRU-488 V1.0 T1L3KL7D C. DB1 D. DB2 F. DB3 G. DB4 (E)xit Enter the item letter to change any ID Figure 18.

  • Page 44: View Troubleshooting Screen

    Provisioning 150-432-100-02, Revision 02 View Troubleshooting Screen The Troubleshooting screen graphically analyzes the circuit and identifies any problem areas. Press at the Maintenance Terminal Main Menu to access the Troubleshooting screen. The Troubleshooting screen (Figure 20) appears showing the HLU, the HRU and any doublers that are in the circuit (up to four). HDSL Loop 1 TIME: 11:01:51 TROUBLESHOOTING with HELP...

  • Page 45: Troubleshooting With Help

    150-432-100-02, Revision 02 Provisioning To display the circuit Help diagram (Figure 22), press . The symbol legend used to describe all circuit events and the corresponding troubleshooting tips are located beneath the Help diagram. A troubleshooting symbol on the diagram identifies the location of a problem. Those legend symbols which appear in parentheses are also keyboard commands for obtaining additional information.

  • Page 46: Troubleshooting With Margin Values

    Provisioning 150-432-100-02, Revision 02 Press to display margin values for the circuit (Figure 23). TIME: 00:30:21 TROUBLESHOOTING with MARGIN VALUES DATE: 04/07/00 CIRCUIT ID#: |17 15| |15 16| |16 16| |16 16| |16 19| >>>>| |=====| |=====| |=====| |=====| |=====| |>>>>...

  • Page 47: Troubleshooting

    150-432-100-02, Revision 02 Troubleshooting ROUBLESHOOTING This section provides information about system alarms and loopback testing. In addition to these troubleshooting aids, the Maintenance Terminal provisioning interface includes troubleshooting screens (see “View Troubleshooting Screen” on page 36) that provide a basic graphical analysis of system problems. YSTEM LARMS Table 12...

  • Page 48: Alarm Option For Dlc Feed

    Troubleshooting 150-432-100-02, Revision 02 Alarm Option for DLC Feed To improve HiGain compatibility with the switch-to-protect features used in DLC feeder applications, the HLU-432 has an Alarm Pattern Option (ALMP) that allows you to select either an AIS or LOS T1 output payload for the following alarms: •...

  • Page 49: Loopback Operation

    150-432-100-02, Revision 02 Troubleshooting OOPBACK PERATION HiGain has a family of loopback options for analyzing circuit functionality. The loopback signal is transmitted and returned to the sending device for comparison. This allows you to verify the integrity of the HDSL channels to the HLU, and the HLU DSX-1 interface and the DS1 channels to the customer.
  • Page 50 Troubleshooting 150-432-100-02, Revision 02 Table 13. Summary of HiGain Loopback Codes Method of Transmission Loopback Code Description Test Set Craft Port MODE/SEL NLOC 1111000 Network Local. Invokes HLU loopback toward the network. 4-in-7 NDU1 110000 Network Doubler 1. Invokes HDU1 loopback toward the network.

  • Page 51: Special Loopback Commands

    150-432-100-02, Revision 02 Troubleshooting Special Loopback Commands In addition to the GNLB loopback command mode, a HiGain system can be configured for one of five special loopback command modes. These are selected from the maintenance terminal System Settings screen (see Table 8 on page 20) or by using the MODE and SEL buttons (see...

  • Page 52: Initiating A Manual Loopback Session

    Troubleshooting 150-432-100-02, Revision 02 Initiating a Manual Loopback Session A manual loopback session allows you to select any one of the HiGain GNLB loopbacks listed in Table 13 on page 42 with the exception of SmartJack loopbacks, which can only be issued by inband commands. Setting the Loopback Time-out Option Before initiating a loopback session, verify that the Loopback Time-out parameter is set to the desired setting.

  • Page 53: Loopback Test Procedures

    150-432-100-02, Revision 02 Troubleshooting You can terminate loopbacks manually and exit the MAN LPBK mode by simultaneously pressing the MODE and SEL buttons for 3 or more seconds. If no loopback is active, the MAN LPBK mode automatically terminates after 30 seconds. All loopbacks can be initiated by inband commands in the T1 payload or by a command from the HiGain system (front-panel buttons or maintenance screen selections).
  • Page 54 Troubleshooting 150-432-100-02, Revision 02 Figure 26. Loopback Configurations July 18, 2002 HLU-432 List 1...

  • Page 55: A1Lb, A2Lb, And A5Lb Test Procedures

    150-432-100-02, Revision 02 Troubleshooting A1LB, A2LB, and A5LB Test Procedures Using the codes listed in Table 14, a network tester can activate NLOC or NREM loopbacks (or SMJK, if enabled). A tester at the customer premises can activate CLOC or CREM loopbacks. All loopbacks shown in Table 14 can also be initiated from the HLU-432 front-panel MODE and SEL buttons (see “Setting Options...
  • Page 56 To avoid this uncertainty, ADC recommends sending unframed IR commands. The HLU is now in logic loopback if the IOR NLOC loopback command was sent. The Time-out Override command or a Loopdown command can override the selection made for the loopback time-out (see “Setting...
  • Page 57 150-432-100-02, Revision 02 Troubleshooting Once the test is complete, do one of the following: • If the system is to loopdown but remain Armed, send the IR LPDN code (universal loopdown). • If all the equipment is to be looped down, disarmed and returned to normal operation, send the disarm inband code 11100 or the ESF-DL code (FF24).

  • Page 58: A3Lb And A4Lb Test Procedures

    Troubleshooting 150-432-100-02, Revision 02 A3LB and A4LB Test Procedures The HLU-432 can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code 1111-1111-0001-1110 (FF1E) for at least 5 seconds. This causes the HLU-432 to enter the NLOC state. The Loopback Time-out setting (see “Setting the Loopback Time-out Option”...

  • Page 59: Appendix A - Specifications

    150-432-100-02, Revision 02 Appendix A - Specifications A - S PPENDIX PECIFICATIONS This appendix provides general specifications, pinout diagrams for the craft port and card-edge connector, HDSL insertion loss guidelines, and power consumption and dissipation tables. HDSL Line Code 784 kbps 2B1Q +13.5 dBm ±0.5 dB at 135 W HDSL Output 135 W...

  • Page 60: Hdsl Insertion Loss Guidelines

    1.54 (a) At 196 kHz, 68°F (20°C) A Windows-based program, Cable Calculator, may be downloaded from the Customer site portion of the ADC Web site at www.ADC.com . If you don’t have a customer password, contact your sales representative. OWER...

  • Page 61: Power Consumption With Doublers

    150-432-100-02, Revision 02 Appendix A - Specifications Power Consumption with Doublers Table 18 through Table 24 list the power consumed and dissipated by the HLU-432 when it is used with any of the four basic doubler types in the HiGain family. The maximum current drawn by the CO supply is also listed. Table 18 through Table 20...

  • Page 62: Hlu-432 List 1 Power Parameters-Two Doublers (Hdu-451 List 3, 4, 3B Or 4B)

    Appendix A - Specifications 150-432-100-02, Revision 02 Table 21 through Table 23 show power parameters for two doubler, line-powered circuits on 9 kft, 26 AWG loops. Table 21. HLU-432 List 1 Power Parameters—Two Doublers (HDU-451 List 3, 4, 3B or 4B) HRU CPE 42.5 Vdc Power HRU Model No.

  • Page 63: Maximum Power Dissipation

    150-432-100-02, Revision 02 Appendix A - Specifications AXIMUM OWER ISSIPATION The Maximum Power Dissipation measures the power that is converted into heat that builds up within the unit. It contributes to the total heat generated in the space around the unit. It is used to determine the maximum number of fully loaded shelves per bay that does not exceed the maximum allowable power dissipation density in watts per square foot to comply with GR-63.

  • Page 64: Hlu-432 Card Connector

    The HLU-432 provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the various ADC Management System protocols to manage the HLU through the HMU-319 HiGain Management Unit. Whenever the HLU-432 is under management, the MNGD message appears periodically on the HLU-432 front-panel display.

  • Page 65: System Alarm Relay Output

    150-432-100-02, Revision 02 Appendix A - Specifications System Alarm Relay Output The normally open alarm contacts available across pins 22 and 30 (Figure 27 on page 56) comprise the HLU-432 system alarm output. These alarm contacts close for any system alarms condition. (See “View Troubleshooting Screen”...

  • Page 66: Appendix B - Functional Operation

    UNCTIONAL PERATION ADC’s HDSL technology provides full-duplex services at standard T1 rates over copper wires between an HLU and an HRU, which comprise one HiGain system. HiGain systems use ADC 2-Binary 1-Quartenary (2B1Q) HDSL transceiver systems: to establish two, full-duplex, 784 kbps data channels between the HLU-432 and a remotely located HDU or HRU.

  • Page 67: Ground Fault Detect

    150-432-100-02, Revision 02 Appendix B - Functional Operation ROUND AULT ETECT The HLU-432 has a Ground Fault Detect (GFD) circuit which detects a ground or a resistive path to ground on any wire of any loop of any span with a non-zero voltage. For low (-135 Vdc) applications, such a circuit is active during start-up by applying the bipolar voltage to the loops.

  • Page 68: Appendix C - Compatibility

    Indoor shelves • ADC HRE-420 Single wide, single mount • ADC HRE-422 Double wide, double mount • ADC HRE-425 12-slot wall or rack mount • ADC HRE-427 7-slot wall or rack mount • 200-mechanics type shelves • 400-mechanics type shelves Outdoor shelves •...
  • Page 69 150-432-100-02, Revision 02 Appendix C - Compatibility Table 25. HiGain Doubler Deployment Matrix Maximum Number of Doublers Per Circuit HDU-451, List 3, 3B, 4, 4B HDU-437, 439 HDU-404, 407, 409 Line Powered Local Powered Line Powered Local Powered Line Powered Local Powered HLU Model HLU-231...

  • Page 70: Appendix D - Product Support

    ADC Customer Service Group provides expert pre-sales and post-sales support and training for all its products. ADC Customer Service Group provides expert pre-sales and post-sales support and training for all its products. Technical support is available 24 hours a day, 7 days a week by contacting the ADC Technical Assistance Center (TAC).

  • Page 71: Appendix E - Abbreviations

    150-432-100-02, Revision 02 Appendix E - Abbreviations E - A PPENDIX BBREVIATIONS Numerics CSU: Channel Service Unit 2B1Q: 2-Binary 1-Quartenary Decibel DDS: Digital Data Service A3LB: Addressable 3 Loopback DIS: Disabled A4LB: Addressable 4 Loopback DLC: Digital Loop Carrier A5LB: Addressable 5 Loopback DS0: Digital Signal, Level 0 ACO:...
  • Page 72 Appendix E - Abbreviations 150-432-100-02, Revision 02 HRU: HiGain Remote Unit PWRF SHRT: Power Feed Short ILR: Intelligent Repeater Loop RAIS: Remote Alarm Indicating Signal INSL: Insertion Loss RCV: Receive IOR: Intelligent Office Repeater RDA: Remote DS1 Alarm Intelligent Repeater RLOSL: Remote Loss of Signal LAIS: Local Alarm Indicating Signal SuperFrame...

  • Page 73: Certification And Warranty

    ADC during the 90-day warranty period is, at ADC’s option, either (a) return of the price paid or (b) repair or replace of the software. ADC also warrants that, for a period of thirty (30) days from the date of purchase, the media on which software is stored will be free from material defects under normal use.
  • Page 74 ADC DSL Systems, Inc. 14402 Franklin Avenue Tustin, CA 92780-7013 Tel: 714.832.9922 Fax: 714.832.9924 Technical Assistance Tel: 800.638.0031 Tel: 714.730.3222 Fax: 714.730.2400 : 150-432-100-02 OCUMENT ISO 9001/TL 9000 ´,GP¶54¨ 1239485 DNV Certification, Inc. REGISTERED FIRM...

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