PairGain HIGAIN HLU-431 Manual
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PairGain HIGAIN HLU-431 Manual

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Model
HLU-431
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NGINEERING
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LINE UNIT
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STATUS
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PairGain
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ECHNOLOGIES
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150-431-116-01
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Part Number
150-1504-16
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Summary of Contents for PairGain HIGAIN HLU-431

  • Page 1 Model List Number Part Number HLU-431 150-1504-16 HLU 431 LINE UNIT I AIN MARGIN MODE SETUP STATUS SPAN SPAN PairGain ECHNOLOGIES NGINEERING ERVICES ECHNICAL RACTICE ™150-431-116-01-¨ 150-431-116-01 ECTION...
  • Page 2 PairGain and HiGain are registered trademarks of 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.
  • Page 3 Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short or irregular, contact PairGain as described in the Warranty. If you must store the equipment for a prolonged period, store the equipment in its original container.

  • Page 4: Table Of Contents

    Table of Contents 150-431-116-01, Revision 01 ABLE OF ONTENTS Overview ____________________________________________________________________________ 1 Features.............................. 1 Compatibility............................. 1 Applications............................2 Applications without Doublers ................... 2 Applications with HiGain Doublers..................2 Positron High Voltage Protection ..................2 Front Panel __________________________________________________________________________ 3 Installation ___________________________________________________________________________ 7 Verification............................
  • Page 5 150-431-116-01, Revision 01 Table of Contents Loopback Operation.........................34 Smartjack (SMJK) Loopback ....................34 Generic Loopback Code (GNLB)..................34 Addressable Repeater Loopback Functions ..............34 Initiating Manual Loopback Sessions................35 Loopback Test Procedures....................36 Loopback Configurations ....................37 GNLB Loopback Test Procedures..................38 A1LB, A2LB, and A5LB Test Procedures................39 A3LB and A4LB Test Procedures..................41 Appendix A - Specifications____________________________________________________________ 43 HDSL Insertion Loss Guidelines .....................44...
  • Page 6 List of Figures 150-431-116-01, Revision 01 IST OF IGURES Figure 1. HLU-431 List 1F Front Panel......................3 Figure 2. Installing the HLU-431 into a Shelf ....................7 Figure 3. Maintenance Terminal Main Menu ....................13 Figure 4. System Spans..........................14 Figure 5.
  • Page 7 150-431-116-01, Revision 01 List of Tables IST OF ABLES Table 1. Front Panel Description........................4 Table 2. Front Panel Display Messages ......................5 Table 3. Navigational Keys on the Maintenance Terminal.................12 Table 4. Maintenance Terminal Screens .....................13 Table 5. Span Status Fields and Descriptions .....................16 Table 6.
  • Page 8 List of Tables 150-431-116-01, Revision 01 viii May 14, 1999 HLU-431 List 1F...

  • Page 9: Overview

    Overview VERVIEW ® ® The PairGain HiGain Line Unit HLU-431 List 1F is the Central Office (CO) side of a repeaterless T1 transmission system. When used in conjunction with a HiGain Remote Unit (HRU), the system provides 1.544 Mbps transmission on two unconditioned copper pairs over the full Carrier Service Area (CSA) range. The CSA includes loops up to 12,000 feet of 24 AWG or 9,000 feet of 26 AWG wire, including bridged taps.

  • Page 10: Applications

    Overview 150-431-116-01, Revision 01 PPLICATIONS HiGain systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital Service (HCDS) over metallic pairs. • The service is deployed over two unconditioned, non-loaded copper pairs, yet it demonstrates a quality that is competitive with fiber optics.

  • Page 11: Front Panel

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

  • Page 12: Table 1. Front Panel Description

    Front Panel 150-431-116-01, Revision 01 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.

  • Page 13: Table 2. Front Panel Display Messages

    150-431-116-01, Revision 01 Front Panel Table 2. Front Panel Display Messages Message Full Name Description ALARM MESSAGES Alarm CutOff A system alarm has occurred, and has been retired to an ACO condition by pressing the SEL button on the HLU front panel. ALRM Alarm Condition Exists A system alarm condition is in effect.
  • Page 14 Front Panel 150-431-116-01, Revision 01 Table 2. Front Panel Display Messages (Cont.) Message Full Name Description CODE Line Code: AMI, B8ZS, AUTO The line code that HLU-431 is receiving at its DSX-1 interface, if the DS1 option is set to Auto. Otherwise, it mimics either of the other two DS1 line code settings, Alternate Mark Inversion (AMI) or Bipolar with 8-zero Substitution (B8ZS).

  • Page 15: Installation

    Upon receipt of the equipment, visually inspect it for signs of damage. If the equipment has been damaged in transit, immediately report the extent of damage to the transportation company and to PairGain Technologies, Inc. Figure 2. Installing the HLU-431 into a Shelf When installing an HLU in a chassis, be sure to wear an antistatic wrist strap.

  • Page 16: Verification

    Installation 150-431-116-01, Revision 01 ERIFICATION Once the HLU-431 is installed, verify that it is operating properly. To do this, you need to monitor the following: • Status LED • Status messages reported by the front panel display (see Table 2 on page Verification without a Downstream Device If there is no downstream device installed: Verify that the HLU powers up.

  • Page 17: Provisioning Requirements

    150-431-116-01, Revision 01 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 150-431-116-01, Revision 01 ROVISIONING This is a reference section for HLU provisioning. There are two methods for provisioning the HLU-431: • Use the MODE and SEL buttons on the front panel of the HLU to: – set system options –...

  • Page 19: Resetting To Factory Default Values

    150-431-116-01, Revision 01 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 6 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 150-431-116-01, Revision 01 SING A AINTENANCE ERMINAL Connecting to a Maintenance Terminal The craft port on the front panel allows you to connect the HLU-431 to a maintenance terminal (ASCII terminal or PC running a terminal emulation program). Once connected to a maintenance terminal, you can access the maintenance, provisioning, and performance screens.

  • Page 21: Figure 3. Maintenance Terminal Main Menu

    150-431-116-01, Revision 01 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, type the letter shown next to the menu item.

  • Page 22: Using The Maintenance Terminal Screens

    Provisioning 150-431-116-01, Revision 01 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 parenthesis for the parameter to be changed. System Spans As shown in Figure...

  • Page 23: Figure 5. Span Status Screen: No Doubler

    150-431-116-01, Revision 01 Provisioning Span Status Screen without Doublers SPAN STATUS TIME: 00:14:11 DATE: 05/03/99 Circuit ID#: ALARMS: NONE LOOPBACK: OFF HDSL-1 HDSL-2 HDSL-1 HDSL-2 cur/min/max cur/min/max cur/min/max cur/min/max MARGIN: 21/17/21 20/17/21 21/18/21 20/18/21 dB PULSE ATTN: INS LOSS: PPM OFFSET: 24 HOUR ES: 00002 00004...

  • Page 24: Table 5. Span Status Fields And Descriptions

    Provisioning 150-431-116-01, Revision 01 Table 5 lists the Span Status fields and descriptions. Table 5. Span Status Fields and Descriptions Field Description Time Time of day when Span Status was checked. Date Date when Span Status was checked. Circuit ID Shows the user-defined circuit ID.

  • Page 25: Table 6. Hdsl System Alarms

    150-431-116-01, Revision 01 Provisioning Table 6. HDSL System Alarms Message Name Description LOSW Loss of Sync Word One of the HDSL loops has lost synchronization. LLOS Local Loss of Signal No signal from HLU-431 local T1 input. MAL1(2) Margin Alarm 1 or 2 The margin on the HDSL Loop 1 (or Loop 2) has dropped below the threshold (1 to 15 dB) set by the user.

  • Page 26: Set Clock Screen

    Provisioning 150-431-116-01, Revision 01 Set Clock Screen Press from the Maintenance Terminal Main Menu to open the Set Clock screen (Figure SET CLOCK TIME: 00:14:33 DATE: 05/03/99 CIRCUIT ID#: Format: HH:MM MM/DD/YY NEW TIME: NEW DATE: (U)PDATE REMOTE? Figure 7. Set Clock Screen All time information is lost when power is removed.

  • Page 27: System Settings Screen

    150-431-116-01, Revision 01 Provisioning System Settings Screen The options set from the System Settings screen are the same as the options set through the HLU-431 front panel Mode and SEL buttons (except for Margin Alarm Threshold and DS0 Blocking, which can only be set at this screen).

  • Page 28: Table 8. Hlu-431 List 1F System Settings Screen Options

    Provisioning 150-431-116-01, Revision 01 Table 8 describes the System Settings screen options and their counterpart codes for the front panel display. Factory default settings are shown in bold. Table 8. HLU-431 List 1F System Settings Screen Options Front Panel System Settings Display Selection Description...
  • Page 29 150-431-116-01, Revision 01 Provisioning Table 8. HLU-431 List 1F System Settings Screen Options (Cont.) Front Panel System Settings Display Selection Description Screen Options Code DSX-1 Line Code AUTO The HLU-431 and HRU monitor the incoming T1 bit streams for the B8ZS line code.
  • Page 30 Provisioning 150-431-116-01, Revision 01 Also, all blocked channels are temporarily unblocked for all HiGain system loopback tests for all DS1 blocking settings. This allows the standard full bandwidth T1 loopback tests to be performed for all DS0 blocking settings. If any of the unused DS0 channels of a fractional T1 service are filled with information other than an idle code of all ones, the HiGain system blocks this information from reaching the remote end of the circuit and replaces those DS0 channels with an idle code of all ones.

  • Page 31: Loopback Mode Screen

    150-431-116-01, Revision 01 Provisioning at turn-up, when one conductor does open, a system alarm occurs and causes the AIS/LOS condition. This alerts the maintenance personnel of the problem. • 2LP requires both HDSL loops to be out of sync (LOSW) before the HAIS signal is transmitted. 2LP preserves the integrity of the 12 surviving channels when just one loop is lost.

  • Page 32: Figure 9. Loopback Menu: No Doubler

    Provisioning 150-431-116-01, Revision 01 Loopback Menu without Doubler LOOPBACK MENU TIME: 00:15:34 DATE: 05/03/99 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 33: Figure 11. Nloc Loopback Mode Reported In The Maintenance Terminal Main Menu

    150-431-116-01, Revision 01 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 34: View Performance Data Screen

    Provisioning 150-431-116-01, Revision 01 View Performance Data Screen The Performance Data screens show 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 35: Figure 12. Performance Data Screen: No Doubler

    150-431-116-01, Revision 01 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-431 and the HRU. Date: 05/03/99 PERFORMANCE DATA CIRCUIT ID#: ERRORED SECONDS/UNAVAILABLE SECONDS HDSL-1 HDSL-2...

  • Page 36: View Performance History Screen

    Provisioning 150-431-116-01, Revision 01 View Performance History Screen The View Performance History option allows you to access the 7 Day History screens that show the number of ES and UAS occurrences in 24-hour increments for a seven-day period. Errored Seconds and Unavailable Seconds for both HDSL loops and each of the two DS1 inputs are listed for the current and previous seven days.

  • Page 37: Figure 15. 7 Day History Screen: Two Doublers (Span 3)

    150-431-116-01, Revision 01 Provisioning Performance History Screen for Doubler Applications The 7 Day History screen displays information by span. With no doubler, there is only one span (Figure 14). With multiple doublers (up to two), there can be as many as three span screens. Time: 03:09:34 Span 3 PERFORMANCE HISTORY 7 DAY CIRCUIT ID#:...

  • Page 38: View Alarm History Screen

    Provisioning 150-431-116-01, Revision 01 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 31) the: •...

  • Page 39: Figure 16. Alarm History Screen: No Doubler

    150-431-116-01, Revision 01 Provisioning Alarm History Screen without Doubler ALARM HISTORY TIME: 00:17:18 DATE: 05/03/99 CIRCUIT ID#: Type First Last Current Count LOS, DS1-HLU LOS, DS1-HRU SPAN1 LOSW, HDSL1 SPAN1 LOSW, HDSL2 SPAN1 ES, HDSL1 SPAN1 ES, HDSL2 SPAN1 MARGIN L1 SPAN1 MARGIN L2 PWR-OPEN PWR-SHRT...

  • Page 40: Enter Circuit Id Screen

    Provisioning 150-431-116-01, Revision 01 Enter Circuit ID Screen To set a Circuit ID: Press from the Maintenance Terminal Main Menu. Type a unique identifier for the circuit, up to 24 characters, then press (17(5 . If you type more than 24 characters, a warning beep sounds, and only the first 24 characters are accepted.

  • Page 41: Troubleshooting

    150-431-116-01, Revision 01 Troubleshooting ROUBLESHOOTING YSTEM LARMS Table 12 lists possible HLU-431 alarm states. The accompanying front panel message is listed in the Alarm column. More than one alarm condition can exist at any given time, but only one message can be displayed. For multiple alarms, only the highest priority alarm displays are accepted.

  • Page 42: Self Test

    Troubleshooting 150-431-116-01, Revision 01 Self Test The Self Test mode that occurs when both HDSL loops are not in sync has been enhanced to include the input DS1 transceiver chip. The Self Test procedure can cause the AIS pattern that is normally transmitted from the HLU-431 during these out of sync intervals, to exhibit occasional BPVs.

  • Page 43: Initiating Manual Loopback Sessions

    150-431-116-01, Revision 01 Troubleshooting • Initiation from either end • Repeating bit error signatures • Alternate query loopback These additions make A1LB identical to A2LB described in the next section. It is given a separate identity to allow future T1/E1 enhancements to be added without affecting A2LB. A5LB differs from A2LB in that A5LB does not block the arming code from exiting the HLU-431 into the network.

  • Page 44: Loopback Test Procedures

    Troubleshooting 150-431-116-01, Revision 01 To execute a CRE loopback, press the MODE button again. To execute a CLO loopback, press the MODE button a third time. These same loopbacks can be initiated from the craft port by choosing the Loopback Mode, option D, from the Main Menu.

  • Page 45: Loopback Configurations

    150-431-116-01, Revision 01 Troubleshooting Loopback Configurations The complete family of loopbacks that a HiGain system equipped with the HDU-409 can execute is shown in Figure 18. Four of those loopbacks, NDU1, NDU2; CDU1, CDU2 occur in the doubler. The loopbacks can be initiated from the HLU craft port, the HLU front-panel MODE and SEL buttons, or from a family of Special Loopback (SPLP) inband loopback commands.

  • Page 46: Gnlb Loopback Test Procedures

    Troubleshooting 150-431-116-01, Revision 01 The more common generic, SPLB inband loopback commands for doubler loopbacks are listed in Table 12. The commands are very specific combinations of either 6 or 7 bits that continuously repeat. All NXXX loopbacks are towards the network. All CXXX loopbacks are towards the customer. Table 13.

  • Page 47: A1Lb, A2Lb, And A5Lb Test Procedures

    HLU-431 may indicate one more or one less bit error, depending on the test set type and the number of frame bits contained in the block of errored bits. To avoid this uncertainty, PairGain recommends sending the IR commands unframed.
  • Page 48 Troubleshooting 150-431-116-01, Revision 01 Once the test is complete, do one of the following: • If the system is to loopdown but remain ARMED, send the IR (Intelligent Repeater) LPDN code (universal loopdown). • If all the equipment is to be looped down, disarmed and returned to normal operation, send the disarm code 11100.

  • Page 49: A3Lb And A4Lb Test Procedures

    150-431-116-01, Revision 01 Troubleshooting Information specific to HiGain doublers is shown in bold in Table Table 14. Addressable 1, 2, 5, (A1LB, A2LB, A5LB) Repeater Loopback Commands Name Description Code ARMING or NI LPBK (inband) Arming code 11000 11000 … ARMING or NI LPBK (ESF Data Link) Arming code 1111(F...

  • Page 50: Table 15. Addressable 3 And 4 (A3Lb And A4Lb) Repeater Loopback Commands

    Troubleshooting 150-431-116-01, Revision 01 Table 15 summarizes the codes required to execute Addressable 3 and 4 (A3LB and A4LB) repeater loopback commands. All code sequences must be present for at least 5 seconds. The abbreviations used in Table 15 are as follows: •...

  • Page 51: Appendix A - Specifications

    150-431-116-01, Revision 01 Appendix A - Specifications A - S PPENDIX PECIFICATIONS 784 kbps 2B1Q HDSL Line Code +13.5 dBm ±0.5 dB at 135 Ω HDSL Output 135 Ω HDSL Line Impedance 35 dB at 196 kHz, 135 Ω Maximum Provisioning Loss Line Clock rate Internal “Stratum 4”...

  • Page 52: Hdsl Insertion Loss Guidelines

    Appendix A - Specifications 150-431-116-01, Revision 01 HDSL I NSERTION UIDELINES Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135 Ω. provides a “loss” guide for the various cable gauges at 196 kHz and 135 Ω. The table applies to the Table 16 HDSL cable pairs between the HLU, HRU, and HDU modules.

  • Page 53: Card-Edge Connector

    The HLU-431 List 1F provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the various PairGain Management System protocols to manage the HLU through the HMU-319 HiGain Management Unit. Whenever the HLU-431 is under management, the MNGD message displays periodically on the HLU-431 front panel display.

  • Page 54: System Alarm Relay Output

    Appendix A - Specifications 150-431-116-01, Revision 01 System Alarm Relay Output The normally open alarm contacts available across pins 20 and 21 (Figure 19) comprise the HLU-431 system alarm output. These alarm contacts close for any system alarms condition. The alarm contacts also close if power is lost or removed from the slot, providing fail-safe relay output.

  • Page 55: Appendix B - Functional Operation

    UNCTIONAL PERATION PairGain 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 PairGain 2-Binary 1, Quartenary (2B1Q) HDSL transceiver systems to establish two, full-duplex, 784 kbps data channels between the HLU-431 and a remotely located HDU or HRU.

  • Page 56: Appendixc - Compatibility

    Appendix C - Compatibility 150-431-116-01, Revision 01 C - C PPENDIX OMPATIBILITY OUNTING The HLU-431 List 1F is compatible with any mounting that accepts 400 mechanics, including the following PairGain mountings: • HRE-420, Single Slot • HRE-422, Dual Slot • HRE-427, Seven Slot •...

  • Page 57: Table 17. Higain Doubler Deployment Matrix

    150-431-116-01, Revision 01 Appendix C - Compatibility Table 17. 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 CPEI ON CPEI OFF...

  • Page 58: Appendixd - Product Support

    PairGain Customer Service Group provides expert pre-sales and post-sales support for all its products. ECHNICAL UPPORT Technical assistance is available 24 hours a day, 7 days a week by contacting PairGain Customer Service Group at: (800) 638-0031 or (714) 832-9922 Telephone: The 800 telephone support line is toll-free in the U.S.
  • Page 59 Be as detailed in your description as possible. Pack the equipment in a shipping carton. Write PairGain’s address and the Return Material Authorization number you received from Customer Service clearly on the outside of the carton: PairGain Technologies, Inc.

  • Page 60: Appendix E - Glossary

    Appendix E - Glossary 150-431-116-01, Revision 01 E - G PPENDIX LOSSARY 2B1Q 2 Binary,1 Quaternary DSX-1 DS1 Cross-connect Frame Alarm Cut Off Equipment Catalog Item Alarm Indicator Signal Enabled ALMP Alarm Pattern ENFT Enable Fractional T1 Alternate Mark Inversion Errored Seconds American Wire Gauge Extended SuperFrame...
  • Page 61 150-431-116-01, Revision 01 Appendix E - Glossary Network Management and Administration Return Material Authorization NREM Network Remote Loopback SAIS SmartJack AIS NVRAM Non-Volatile Random Access Memory Super Frame Office Repeater Bay SMJK SmartJack Personal Communication Services Signal-to-Noise Ratio Payload SPLB Special Loopback POTS Plain Old Telephone Service...

  • Page 63: Certification And Warranty

    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.
  • Page 64 Corporate Office 14402 Franklin Avenue Tustin, CA 92780 Tel: (714) 832-9922 Fax: (714) 832-9924 For Technical Assistance: (800) 638-0031...

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