PairGain T1L2F10A Manual
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PairGain T1L2F10A Manual

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H
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L
U
I
AIN
INE
NIT
Model
List Number
Part Number
CLEI Code
HLU-231
8E
150-1111-85
T1L2F10A
P
G
T
, I
.
AIR
AIN
ECHNOLOGIES
NC
E
S
T
P
NGINEERING
ERVICES
ECHNICAL
RACTICE
S
150-231-185-05
ECTION

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Summary of Contents for PairGain T1L2F10A

  • Page 1 Model List Number Part Number CLEI Code HLU-231 150-1111-85 T1L2F10A ECHNOLOGIES NGINEERING ERVICES ECHNICAL RACTICE 150-231-185-05 ECTION...
  • Page 2 Information furnished by PairGain Technologies is believed to be accurate and reliable. However, no responsibility is assumed by PairGain Technologies for its use; nor for any infringement of patents or other rights of third parties which may result from its use.
  • 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 located inside the back cover. 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 150-231-185-05, Revision 05 ABLE OF ONTENTS Overview ____________________________________________________________________________ 1 Features.............................. 1 Product Enhancements ......................1 Standard Features........................ 2 Compatibility............................. 2 Applications............................2 HiGain Doubler Applications ..................... 3 Personal Communications System Applications ..............3 Front Panel __________________________________________________________________________ 4 Installation ___________________________________________________________________________ 8 Verification............................
  • Page 5 150-231-185-05, Revision 05 Table of Contents System Settings Screen......................20 Equalization Option.....................23 BPVT Option.......................23 BER Option ......................24 DS0 Blocking Option ..................24 DS1 Line Code Option..................24 Margin Alarm Threshold Option.................25 HAIS Option .......................25 HDSL Line Voltage Options................25 Loopback Mode Screen .....................26 Loopback Menu without Doubler ...............27 Loopback Menu for Doubler Applications ............27 Initiating a Loopback ..................28 Disabling a Loopback..................28...
  • Page 6 Table of Contents 150-231-185-05, Revision 05 Initiating a Manual Loopback Session................45 Setting the Loopback Time-out Option .............. 45 Initiating a Manual Loopback Session ............... 45 Loopback Test Procedures ......................46 General Troubleshooting Tips ..................46 GNLB Test Procedures ..................... 46 A1LB, A2LB, and A5LB Test Procedures ...............
  • Page 7 150-231-185-05, Revision 05 List of Figures IST OF IGURES 1. HLU-231 List 8E Front Panel .........................4 2. Installing the HLU-231 List 8E into a Shelf ....................8 3. Maintenance Terminal Main Menu .......................14 4. System Spans..............................15 5. Span Status Screen: No Doubler ........................16 6.
  • Page 8 List of Tables 150-231-185-05, Revision 05 IST OF ABLES 1. Front-panel Description ........................... 5 2. Front-panel Display Messages......................... 6 3. Navigational Keys on the Maintenance Terminal ..................13 4. Maintenance Terminal Screens........................14 5. Span Status Fields and Descriptions ......................17 6.

  • Page 9: Overview

    Overview VERVIEW ® ® The PairGain HiGain Line Unit HLU-231 List 8E 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: Standard Features

    Overview 150-231-185-05, Revision 05 Standard Features • Selectable DS1 pre-equalizer • Front-panel features: – Four-character status display – DS1 splitting and bridging access – Status LED – RS-232 craft port for connection to a maintenance terminal (ASCII terminal or a PC running a terminal emulation program) •...

  • Page 11: Higain Doubler Applications

    150-231-185-05, Revision 05 Overview HiGain Doubler Applications For applications without doublers, the HLU-231 is directly connected to the HRU by the two HDSL cable pairs. The HLU-231 List 8E is compatible with all HiGain HRUs. For doubler applications, one to four doublers may be used in the HDSL loops between the HLU and HRU. •...

  • Page 12: Front Panel

    Front Panel 150-231-185-05, Revision 05 RONT ANEL The HLU-231 List 8E front panel is shown in Figure 1. The front-panel components are described in Table 1 on page 5. For pinout diagrams of the HLU card-edge connector and the craft port, refer to “Appendix A - Specifications”...
  • Page 13 150-231-185-05, Revision 05 Front Panel 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 6 for a listing of the four-character messages.

  • Page 14: Front-Panel Display Messages

    Front Panel 150-231-185-05, Revision 05 Table 2 lists the front-panel display messages. The four-character displays 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 15 150-231-185-05, Revision 05 Front Panel 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 16: Installation

    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 PairGain Technologies. Figure 2. Installing the HLU-231 List 8E into a Shelf When installing an HLU in a chassis, be sure to wear an antistatic wrist strap.

  • Page 17: Verification

    150-231-185-05, Revision 05 Installation ERIFICATION Once the HLU-231 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 18: Provisioning Requirements

    Installation 150-231-185-05, Revision 05 ROVISIONING EQUIREMENTS Refer to “Provisioning” on page 11 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 19: Provisioning

    150-231-185-05, Revision 05 Provisioning ROVISIONING This is a reference section for HLU provisioning. There are two methods for provisioning the HLU-231 List 8E: • Use the MODE and SEL buttons on the front panel of the HLU to: – set system options –...

  • Page 20: Resetting To Factory Default Values

    Provisioning 150-231-185-05, Revision 05 Resetting to Factory Default Values All user options (Table 8 on page 21) 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 21: Using A Maintenance Terminal

    150-231-185-05, Revision 05 Provisioning SING A AINTENANCE ERMINAL Connecting to a Maintenance Terminal The craft port on the front panel allows you to connect the HLU-231 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 22: Maintenance Terminal Main Menu

    Provisioning 150-231-185-05, Revision 05 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 23: Selecting A Maintenance Terminal Function

    150-231-185-05, Revision 05 Provisioning 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 24: Span Status Screen Without Doublers

    Provisioning 150-231-185-05, Revision 05 Span Status Screen without Doublers SPAN STATUS TIME: 00:27:25 DATE: 09/15/99 CIRCUIT ID#: ALARMS: NONE LOOPBACK: OFF POWER LEVEL: LOW HDSL-1 HDSL-2 HDSL-1 HDSL-2 cur/min/max cur/min/max cur/min/max cur/min/max MARGIN: 21/20/22 23/22/24 21/19/22 22/21/24 dB PULSE ATTN: INS LOSS: 24 HOUR ES: 00004...

  • Page 25: Span Status Fields And Descriptions

    150-231-185-05, Revision 05 Provisioning Table 5 lists the Span Status fields and descriptions. Table 6 Table 7 on page 18 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 26: Loopback Messages

    Provisioning 150-231-185-05, Revision 05 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-231 List 8E local T1 input.

  • Page 27: Set Clock Screen

    150-231-185-05, Revision 05 Provisioning Table 7. Loopback Messages (Cont.) Message Full Name Description No active loopback mode. (PL) Pay Load The loopback was initiated by a command that was embedded in the T1 data path. SMJK SmartJack Loopback Loopback from HRU to network initiated by (2-in-5) inband loopback code or out-of-band ESF data link code.

  • Page 28: Set Date

    Provisioning 150-231-185-05, Revision 05 Set Date To set the system date, type the month, day and year in a mm/dd/yy format, then press (17(5 . The Update Remote field appears. When editing entries in the Set Clock screen and when using the Terminal emulation program %$&.63$&( in Windows 3.1, pressing the key deletes two characters instead of just one.

  • Page 29: Hlu-231 List 8E System Settings

    150-231-185-05, Revision 05 Provisioning 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-231 List 8E System Settings Front-panel System Settings Display Parameter Description Screen Options Code Equalization Disables the HLU internal equalizer, allowing connection of external equalizer...
  • Page 30 Provisioning 150-231-185-05, Revision 05 Table 8. HLU-231 List 8E System Settings (Cont.) Front-panel System Settings Display Parameter Description Screen Options Code Alarm Opens the system alarm relay contacts if closed, and disables activation of the system alarm relay when a system alarm condition occurs. Enables activation of the system alarm relay when a system alarm condition occurs.

  • Page 31: Equalization Option

    150-231-185-05, Revision 05 Provisioning Table 8. HLU-231 List 8E System Settings (Cont.) Front-panel System Settings Display Parameter Description Screen Options Code Alarm Pattern ALMP Enables HiGain to output an AIS payload at its DS1 ports for LOSW, T1 LOS and Margin alarms. Enables HiGain to output an LOS condition at its DS1 ports for LOSW, T1 LOS and Margin alarms.

  • Page 32: Ber Option

    Provisioning 150-231-185-05, Revision 05 that direction. The maximum TEC count is 12000. This TEC number is converted into BPVs at the distant end during the following second at a rate of 1 BPV every 128 T1 bits up to a maximum of 12000 (BER=7.7 x 10 This maximum rate is more than adequate since it exceeds the maximum 10 BER required by most DLC systems.

  • Page 33: Margin Alarm Threshold Option

    150-231-185-05, Revision 05 Provisioning codes in each direction of transmission to be identical. In the AUTO mode of older HiGain units, the output code was determined by the input code being received at the local T1 input port instead of at the distant end. The HLU reverts to this older code setting technique when it is not connected to an HRU-402 or HRU-411.

  • Page 34: Loopback Mode Screen

    Provisioning 150-231-185-05, Revision 05 If the HLU-231 is used with the HRU-411 to power PCS sites, the PWRF option should be set to AUTO. This causes the HLU to automatically detect the need to switch to the HIGH power feed mode when it receives a request from the HRU to do so.

  • Page 35: Loopback Menu Without Doubler

    150-231-185-05, Revision 05 Provisioning Loopback Menu without Doubler LOOPBACK MENU TIME: 00:15:34 DATE: 09/15/99 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 36: Initiating A Loopback

    Provisioning 150-231-185-05, Revision 05 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 37: View Performance Data Screen

    150-231-185-05, Revision 05 Provisioning 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 38: Performance Data Screen Without Doubler

    Provisioning 150-231-185-05, Revision 05 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-231 and the HRU. Date: 09/15/99 PERFORMANCE DATA CIRCUIT ID#: ERRORED SECONDS/UNAVAILABLE SECONDS HDSL-1 HDSL-2...

  • Page 39: View Performance History Screen

    150-231-185-05, Revision 05 Provisioning 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 40: Performance History Screen For Doubler Applications

    Provisioning 150-231-185-05, Revision 05 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 41: View Alarm History Screen

    150-231-185-05, Revision 05 Provisioning 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 34) the: •...

  • Page 42: Alarm History Screen Without Doubler

    Provisioning 150-231-185-05, Revision 05 Alarm History Screen without Doubler ALARM HISTORY TIME: 00:27:54 DATE: 09/15/99 CIRCUIT ID#: Type First Last Current Count LOS, DS1-HLU LOS, DS1-HRU AIS, DS1-HLU AIS, DS1-HRU SPAN1 LOSW, HDSL1 09/01/99-00:00 09/15/99-00:00 SPAN1 LOSW, HDSL2 09/01/99-00:00 09/15/99-00:00 SPAN1 MARGIN L1 SPAN1 MARGIN L2 PWR-SHRT...

  • Page 43: View System Inventory Screen

    150-231-185-05, Revision 05 Provisioning View System Inventory Screen The System Inventory screen (Figure 18 on page 36) 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 44: System Inventory Screen Without Doubler

    Provisioning 150-231-185-05, Revision 05 System Inventory Screen without Doubler SYSTEM INVENTORY TIME: 00:27:59 DATE: 09/15/99 A. CIRCUIT ID: UNIT PRODUCT UNIT ID HLU-231 L8E V7.2 NOT REQUIRED B. HRU HRU-402 V1.3 Remote Unit C. DB1 D. DB2 F. DB3 G. DB4 (E)xit Enter the item letter to change any ID Figure 18.

  • Page 45: View Troubleshooting Screen

    150-231-185-05, Revision 05 Provisioning 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 Line 1 TIME: 00:29:56 TROUBLESHOOTING...

  • Page 46: Troubleshooting With Help

    Provisioning 150-231-185-05, Revision 05 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 47: Troubleshooting With Margin Values

    150-231-185-05, Revision 05 Provisioning Press to display margin values for the circuit (Figure 23). TIME: 00:30:21 TROUBLESHOOTING with MARGIN VALUES DATE: 09/15/99 CIRCUIT ID#: >>>>| |=======| |=======| |=======| |=======| |=======| |>>>> <<<<| |=======| |=======| |=======| |=======| |=======| |<<<< |___|17 17|___|16 17|___|17 16|___|17 17|___|17...

  • Page 48: Troubleshooting

    Troubleshooting 150-231-185-05, Revision 05 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 that provide a basic graphical analysis of system problems (see “View Troubleshooting Screen” on page 37).

  • Page 49: Alarm Option For Dlc Feed

    150-231-185-05, Revision 05 Troubleshooting Alarm Option for DLC Feed To improve HiGain compatibility with the switch-to-protect features used in DLC feeder applications, the HLU-231 has an Alarm Pattern Option (ALMP) that allows you to select either an AIS or LOS T1 output payload for the following alarms: •...

  • Page 50: Loopback Operation

    Troubleshooting 150-231-185-05, Revision 05 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, the HLU DSX-1 interface and the DS1 channels to the customer.
  • Page 51 150-231-185-05, Revision 05 Troubleshooting 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 52: Special Loopback Commands

    Troubleshooting 150-231-185-05, Revision 05 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 21) or by using the MODE and SEL buttons (see...

  • Page 53: Initiating A Manual Loopback Session

    150-231-185-05, Revision 05 Troubleshooting 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 43 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 54: Loopback Test Procedures

    Troubleshooting 150-231-185-05, Revision 05 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 55 150-231-185-05, Revision 05 Troubleshooting Figure 26. Loopback Configurations HLU-231 List 8E September 13, 1999...

  • Page 56: A1Lb, A2Lb, And A5Lb Test Procedures

    Troubleshooting 150-231-185-05, Revision 05 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-231 front-panel MODE and SEL buttons (see “Setting Options...
  • Page 57 To avoid this uncertainty, PairGain 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 58 Troubleshooting 150-231-185-05, Revision 05 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 59: A3Lb And A4Lb Test Procedures

    150-231-185-05, Revision 05 Troubleshooting A3LB and A4LB Test Procedures The HLU-231 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-231 to enter the NLOC state. The Loopback Time-out setting (see “Setting the Loopback Time-out Option”...

  • Page 60: Appendix A - Specifications

    Appendix A - Specifications 150-231-185-05, Revision 05 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. 784 kbps 2B1Q HDSL Line Code +13.5 dBm ±0.5 dB at 135 Ω...

  • Page 61: 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 PairGain web site at www.pairgain.com . If you don’t have a customer password, contact your sales representative. OWER...

  • Page 62: Power Consumption With Doublers

    Appendix A - Specifications 150-231-185-05, Revision 05 Power Consumption with Doublers Table 17 through Table 24 list the power consumed and dissipated by the HLU-231 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 17 covers line-powered circuits on 9 kft, 26 AWG loops without a doubler.

  • Page 63: Hlu-231 Power Parameters-Single Doubler (Hdu-409 List 2)

    150-231-185-05, Revision 05 Appendix A - Specifications Table 20. HLU-231 Power Parameters—Single Doubler (HDU-409 List 2) HRU CPE 42.5 Vdc Power HRU Model No. Power Consumption (Watts) Heat Dissipation (Watts) 42.5 Vdc Current (mA) Typical Maximum Typical Maximum Typical Maximum HRU-412 List 1, 2, 3, 4 18.8 20.7...

  • Page 64: Maximum Power Dissipation

    Appendix A - Specifications 150-231-185-05, Revision 05 Table 24 shows power parameters for three doubler, line-powered circuits or four doubler, locally-powered circuits on 9 kft, 26 AWG loops. Table 24. HLU-231 Power Parameters—Three and Four Doublers (HDU-409 List 2) HRU CPE 42.5 Vdc Power HRU Model No.

  • Page 65: Hlu-231 List 8E Card Connector

    The HLU-231 List 8E 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-231 is under management, the MNGD message displays periodically on the HLU-231 List 8E front-panel display.

  • Page 66: System Alarm Relay Output

    Appendix A - Specifications 150-231-185-05, Revision 05 System Alarm Relay Output The normally open alarm contacts available across pins 20 and 21 (Figure 27 on page 57) comprise the HLU-231 List 8E system alarm output. These alarm contacts close for any system alarms condition. (See “View Troubleshooting Screen”...

  • Page 67: 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-231 and a remotely located HDU or HRU.

  • Page 68: Ground Fault Detect

    Appendix B - Functional Operation 150-231-185-05, Revision 05 ROUND AULT ETECT The HLU-231 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 (-140 Vdc) applications, such a circuit is active during start-up by applying the bipolar voltage to the loops.

  • Page 69: Appendixc - Compatibility

    T1 R EPEATER HELVES AND ELATED QUIPMENT The HLU-231 List 8E is compatible with the following T1 repeater shelves and associated equipment: • PairGain HCS-417 (23”) • PairGain HCS-418 (19”) • PairGain HCS-402 (2-slot)) • AT&T 220 Office Repeater Bay (ORB) •...
  • Page 70 Appendix C - Compatibility 150-231-185-05, Revision 05 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 71: Appendixd - Product Support

    PairGain Customer Service Group provides expert pre-sales and post-sales support and training 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 72 Pack the equipment in a shipping carton. Write PairGain’s address and the Return Material Authorization (RMA) Number you received from the RMA Department clearly on the outside of the carton and return to: PairGain Technologies, Inc.

  • Page 73: Appendix E - Glossary

    150-231-185-05, Revision 05 Appendix E - Glossary E - G PPENDIX LOSSARY 2B1Q 2 Binary,1 Quaternary DSX-1 DS1 Cross-connect Frame Alarm Cut Off Equipment Catalog Item Alarm Indication Signal indicated by Enabled transmission of an all ones pattern ALMP Alarm Pattern ENFT Enable Fractional T1 Alternate Mark Inversion...
  • Page 74 Appendix E - Glossary 150-231-185-05, Revision 05 Network Management and Administration SAIS SmartJack AIS NREM Network Remote Loopback Super Frame NVRAM Non-Volatile Random Access Memory SMJK SmartJack Office Repeater Bay Signal-to-Noise Ratio Personal Communication Services SPLB Special Loopback Payload Span Terminating Shelf POTS Plain Old Telephone Service Total Error Count...

  • Page 75: 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 76 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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