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ADC HiGain H4TU-C-388 List 5A User Manual

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ANUAL
HiGain H4TU-C-388 List 5A Line Unit
Product Catalog: H4TU-C-388-L5A
CLEI: VACKMGKA

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Summary of Contents for ADC HiGain H4TU-C-388 List 5A

  • Page 1 ANUAL HiGain H4TU-C-388 List 5A Line Unit Product Catalog: H4TU-C-388-L5A CLEI: VACKMGKA...
  • 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 Unpack each container and 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 DSL Systems, Inc. Order replacement equipment, if necessary.
  • Page 4 Inspecting Shipment LTPH-UM-1252-01 October 15, 2003 H4TU-C-388 List 5A...

  • Page 5: Table Of Contents

    LTPH-UM-1252-01 Table of Contents ABLE OF ONTENTS Overview ____________________________________________________________________________ 1 Features ..............................1 Applications ............................2 Front Panel __________________________________________________________________________ 3 Installation___________________________________________________________________________ 6 Verification ............................7 Provisioning__________________________________________________________________________ 8 Accessing the Provisioning Screens ....................8 Connecting to a Maintenance Terminal................8 Logon Screen ........................8 Provisioning Tasks...........................11 Setting Date and Time .......................11 Setting Circuit ID Numbers ....................12 Configuring the System .....................13 Resetting to Factory Defaults ....................19...
  • Page 6 Table of Contents LTPH-UM-1252-01 Loopback Test Procedures ......................44 General Troubleshooting Tips ..................44 Setting the Loopback Time-Out Option................44 GNLB Test Procedures ..................... 44 A3LB Test Procedures ...................... 47 A5LB Test Procedures ...................... 48 Loopback Testing Using a Maintenance Terminal ............50 Loopback Testing Using Remote Unit Front-Panel Pushbuttons ........
  • Page 7 5. Inventory Screen.............................12 6. Config Menu..............................13 7. Config Menu - Standard Options (defaults shown)..................14 8. Config Menu - ADC Options (defaults shown) .....................14 9. Config Menu - Set Factory Defaults ......................19 10. Config Menu - Master Clear...........................21 11. Monitor Screen - Active Loopback with Alarms ...................22 12.
  • Page 8 3. Navigational Keys for the Maintenance Terminal Screens ................9 4. Logon Screen Menus ............................ 10 5. H4TU-C Standard Config Menu Options ...................... 15 6. H4TU-C ADC Config Menu Options......................16 7. DS1 and DSX-1 24-Hour PM Threshold....................... 18 8. Monitor Screen Descriptions ......................... 23 9.

  • Page 9: Overview

    LTPH-UM-1252-01 Overview VERVIEW The H4TU-C-388 List 5A (H4TU-C) line unit is the Central Office (CO) side of a T1 transmission system. The four-wire HDSL4 product family is based on the HDSL4 standard ANSI T1.418 Issue 2. The H4TU-C, when used with an H4TU-R remote unit, transmits a 1.544 Mbps payload a maximum distance of 12 kft.

  • Page 10: Applications

    Overview LTPH-UM-1252-01 • Fractional T1 (FT1) maintenance • Configuration options — Selectable DSX-1 pre-equalizer — Bipolar Violation Transparency (BPVT) options — Bit Error Rate (BER) alarm — Power Back Off Network (PBON) and Power Back Off Customer (PBOC) options for configuring HDSL4 transmit power levels —...

  • Page 11: Front Panel

    LTPH-UM-1252-01 Front Panel RONT ANEL Figure 1 shows the H4TU-C front panel. Table 1 on page 4 describes the front-panel components. For pinout diagrams of the H4TU-C card-edge connector and craft port, refer to “Appendix A - Specifications” on page H4TU-C 388 List number DSL 1...
  • Page 12 Front Panel LTPH-UM-1252-01 Table 1. Front-Panel Description Front-Panel Feature Function List number List number identifies the list number of the H4TU-C. Front-panel LEDs Display HDSL4 and DS1 Line, provisioning, and alarm status through front-panel LEDs. Refer to Table 2 on page 5 for a listing of the front-panel LEDs and their functions.
  • Page 13 LTPH-UM-1252-01 Front Panel Table 2 lists the LED status and their functions. The H4TU-C reports the alarm type or loopback status on its front panel. Table 2. LED Status and Functions LED and Status Function DSL1 Solid green Loop 1 of the HDSL4 span connected to H4TU-C have synchronized without error. Flashing red once every second Loop 1 of the HDSL4 span connected to H4TU-C is in acquisition.

  • Page 14: Installation

    Upon receipt of the equipment, 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. When installing an H4TU-C in a chassis, be sure to wear an antistatic wrist strap. Avoid touching components on the circuit board.

  • Page 15: Verification

    LTPH-UM-1252-01 Installation ERIFICATION Once the H4TU-C is installed, verify that it is operating properly. To do this, monitor the front-panel status LEDs. Verify that as the H4TU-C powers up, it attempts to communicate with a remote unit as the DSL LED flashes red once every second.

  • Page 16: Provisioning

    Provisioning LTPH-UM-1252-01 ROVISIONING CCESSING THE ROVISIONING CREENS Use a maintenance terminal (ASCII terminal or a PC running terminal emulation software) connected to the H4TU-C craft port (or to an HMU craft port) to access the status, history, inventory, and provisioning screens (see Figure 3 on page No dip switches or jumpers are required to provision the H4TU-C as it contains a non-volatile...
  • Page 17 LTPH-UM-1252-01 Provisioning Menu bar Circuit ID Date and Time Logon Device System Status Figure 3. Logon Screen Table 3. Navigational Keys for the Maintenance Terminal Screens Function SPACEBAR Cycle through selections. ENTER Activate the current setting or choice, or display a menu. (VT100 only) Return to the parent menu.
  • Page 18 Identifies the 100 most recent system events and reports the date and time of occurrence. Config Provides standard configuration options, ADC options, date and time setting, and a reset option (factory settings). Also provides a master clear option that clears all performance, alarm, and event log entries.

  • Page 19: Provisioning Tasks

    LTPH-UM-1252-01 Provisioning ROVISIONING ASKS After the H4TU-C is successfully installed, perform these basic provisioning tasks: • Set date and time (see “Setting Date and Time” on this page). • Set circuit ID numbers (see “Setting Circuit ID Numbers” on page 12).

  • Page 20: Setting Circuit Id Numbers

    Provisioning LTPH-UM-1252-01 Setting Circuit ID Numbers The Inventory screen provides product information on all units in the system and allows setting of the circuit and unit identification numbers. To set the circuit ID numbers: Press to select the Inventory screen. ENTER Type the Circuit ID number in the field indicated (see Figure...

  • Page 21: Configuring The System

    Standard and ADC configuration options. Standard options are those supported by HiGain HDSL4 units when connected to units from other vendors. ADC options are an extended set of options that are only available when using HiGain units exclusively.
  • Page 22 Provisioning LTPH-UM-1252-01 Figure 7. Config Menu - Standard Options (defaults shown) Figure 8. Config Menu - ADC Options (defaults shown) October 15, 2003 H4TU-C-388 List 5A...
  • Page 23 LTPH-UM-1252-01 Provisioning Table 5. H4TU-C Standard Config Menu Options Standard Config Menu Selection Description Options Loopback Timeout (LBTO) NONE Disables automatic time-out cancellation of all loopbacks. 20 min Sets automatic cancellation of all loopbacks to 20 minutes after initiation. 60 min Sets automatic cancellation of all loopbacks to 60 minutes after initiation.
  • Page 24 Configures the power output levels of the H4TU-R customer unit toward the network Customer (PBOC) and Power to comply with the Enhanced template as defined in Section 6.1.4.2 of ANSI T1.418. Back Off Network (PBON) Options” on page Table 6. H4TU-C ADC Config Menu Options ADC Config Selection Description Menu Options Line Power Feed (PWRF) Disables powering to the HDSL4 pair.
  • Page 25 LTPH-UM-1252-01 Provisioning Table 6. H4TU-C ADC Config Menu Options (Continued) ADC Config Selection Description Menu Options Remote Disconnect Alarm Enables a remote DS1 LOS condition at the input to the H4TU-R to generate an LOS (RDA) alarm. AIS or LOS (depending on ALMP) is sent towards the network.
  • Page 26 Provisioning LTPH-UM-1252-01 DS1 BER (DBER) Option. The DS1 BER alarm occurs when any of the DS1 or DSX-1 performance monitoring parameters listed in Table 7 exceed the counts shown for the 24-hour period between 12:00:00 AM through 11:59:59 PM. These thresholds correspond to a 10 BER.

  • Page 27: Resetting To Factory Defaults

    LTPH-UM-1252-01 Provisioning Resetting to Factory Defaults To reset the H4TU-C to its original factory defaults: Press to select the Config menu. Use the ↑ ↓ arrow keys to select Set Factory Defaults (see Figure 9), then press ENTER Press to reset the H4TU-C or press to cancel this action.

  • Page 28: Clearing The History, Alarm, And Event Log Screens

    Provisioning LTPH-UM-1252-01 Clearing the History, Alarm, and Event Log Screens Select Master Clear to clear the History, Alarm, and Event Log screens after the system has been installed and is functioning properly. This removes miscellaneous data acquired during the start-up session and ensures that you have meaningful data thereafter.
  • Page 29 LTPH-UM-1252-01 Provisioning Figure 10. Config Menu - Master Clear H4TU-C-388 List 5A October 15, 2003...

  • Page 30: Monitoring System Activity And Performance

    Monitoring System Activity and Performance LTPH-UM-1252-01 ONITORING YSTEM CTIVITY AND ERFORMANCE The HDSL4 system provides the following maintenance screens for monitoring system activity and assessing performance. • The Monitor screen provides a graphical representation of circuit activity and allow initiation of loopbacks. •...
  • Page 31 LTPH-UM-1252-01 Monitoring System Activity and Performance To initiate a loopdown of all active loopbacks, press SPACEBAR to select LPDN, then press ENTER . When prompted with the message: Are you sure (Y/N)?, press to initiate the loopdown or to cancel. Table 8.

  • Page 32: Using The Performance Screens To View Performance Data

    Monitoring System Activity and Performance LTPH-UM-1252-01 SING THE ERFORMANCE CREENS TO ERFORMANCE The Performance screens display: • CRC statistics for the HDSL4 or DS1 interface in 31-day, 48-hour, 25-hour, and current history reports. • Alarm statistics for the DS1 interfaces (Figure 21 on page 31 Figure 22 on page 31) or HDSL4 interfaces...
  • Page 33 LTPH-UM-1252-01 Monitoring System Activity and Performance Figure 13. H4TU-C DS1 48-Hour Performance History Figure 14. H4TU-R DS1 25-Hour Performance History H4TU-C-388 List 5A October 15, 2003...
  • Page 34 Monitoring System Activity and Performance LTPH-UM-1252-01 Figure 15. H4TU-R DS1 Current Statistics Figure 16. H4TU-C DS1 Current Statistics October 15, 2003 H4TU-C-388 List 5A...

  • Page 35: Performance History At The Hdsl4 Interface

    LTPH-UM-1252-01 Monitoring System Activity and Performance Table 9. Error Acronyms Used on the DS1 Performance History Screens Error Error Description Description Acronym Acronym CV-L Code Violation - Line SES-P Severely Errored Seconds - Path Seconds with SES, CRC (ESF) ≥ 320, or Total BPV count.
  • Page 36 Monitoring System Activity and Performance LTPH-UM-1252-01 Figure 17. H4TU-C HDSL4 31-Day Performance History Figure 18. H4TU-C HDSL4 48-Hour Performance History October 15, 2003 H4TU-C-388 List 5A...
  • Page 37 LTPH-UM-1252-01 Monitoring System Activity and Performance Figure 19. H4TU-C HDSL4 25-Hour Performance History Figure 20. H4TU-C HDSL4 Current Statistics H4TU-C-388 List 5A October 15, 2003...

  • Page 38: Using The Performance Screens To View Alarm Data

    Monitoring System Activity and Performance LTPH-UM-1252-01 Table 10. Error Acronyms Used on the HDSL4 Performance History Screens Error Acronym Description Code Violation Total count of HDSL4 CRC errors. Errored Seconds Seconds with HDSL4 CRC ≥ 1 or LOSW ≥ 1 Severely Errored Seconds Seconds with HDSL4 CRC ≥...
  • Page 39 LTPH-UM-1252-01 Monitoring System Activity and Performance Figure 21. H4TU-C DS1 Alarm History Screen Figure 22. H4TU-R DS1 Alarm History Screen H4TU-C-388 List 5A October 15, 2003...
  • Page 40 Monitoring System Activity and Performance LTPH-UM-1252-01 Table 11. DS1 Alarm Descriptions Message on Screen Description H4TU-C DS1 Alarms (see Figure 21 on page LLOS Line (Unit) Loss of Signal—Loss of the H4TU-C DSX-1 input signal. LAIS Line Alarm Indication Signal—Indicates an AIS (all ones) pattern is being transmitted from the local DS1 output port.

  • Page 41: Alarm History At The Hdsl4 Interface

    LTPH-UM-1252-01 Monitoring System Activity and Performance Alarm History at the HDSL4 Interface The HDSL4 Alarm History screens report alarms at the H4TU-C and the H4TU-R. Figure 23 shows the H4TU-C HDSL4 alarm history. Table 12 describes the alarms that are reported at the H4TU-C or H4TU-R. Figure 23.

  • Page 42: Using The System Event Log To Track Events

    Monitoring System Activity and Performance LTPH-UM-1252-01 SING THE YSTEM VENT OG TO RACK VENTS The System Event Log screen (Figure 24) displays 100 of the most recent events (most recent event displayed first) and provides the following information: • Origin tags to identify the source of a Write entry (see “Origin Tags”...

  • Page 43: Event Log Messages

    LTPH-UM-1252-01 Monitoring System Activity and Performance Event Log Messages Table 13 lists all the possible messages that can be displayed by the System Event Log screen. Table 13. Event Log Entry Messages Any DS1 Alarm History reset Any DS1 PM register reset Any HDSL4 Alarm History reset Any HDSL4 PM register reset Any Loop Down (any segment)

  • Page 44: Origin Tags

    Monitoring System Activity and Performance LTPH-UM-1252-01 Origin Tags The origin tags identify the source of all Write entries and how an event occurred. The exact meaning is dependent on the type of event and the unit reporting the event. A Write entry changes a system parameter or an option setting, but it does not affect circuit status changes, such as alarms.

  • Page 45: Using The Report Menu

    LTPH-UM-1252-01 Monitoring System Activity and Performance SING THE EPORT The Report menu (Figure 25) provides screens containing status and performance monitoring data for line and remote units which can be downloaded to a file for analysis or future reference. Table 15 on page 38 describes the four types of reports provided by the Report menu.
  • Page 46 Monitoring System Activity and Performance LTPH-UM-1252-01 Table 15. Report Types Type Contains the following information: Full Report • Circuit and unit identifications • Product information • System configuration • Current performance statistics • Alarm history • Performance history • System event log Short Report •...

  • Page 47: Testing

    LTPH-UM-1252-01 Testing ESTING This section provides information about system alarms, LOS and AIS response, OCT55 test procedure, and loopback testing. YSTEM LARMS Table 16 provides a summary of the system alarms displayed on the H4TU-C, H4D doubler, and H4TU-R alarm history screens (see “Using the Performance Screens to View Alarm Data”...

  • Page 48: Alarm Option For Digital Loop Carrier (Dlc) Feed

    Testing LTPH-UM-1252-01 Table 16. System Alarms Displayed on Alarm History Screens (Continued) Message on Screen Alarm Description To Enable: PRM-NE Performance Report H4TU-R PRM-NE BER threshold has been Set DBER threshold to Messaging - Near End exceeded. ENA. PRM-FE Performance Report H4TU-R PRM-FE BER threshold has been Set DBER threshold to Messaging - Far End...

  • Page 49: Remote Los And Ais Response

    Remove alarm AIS event? pattern Pass on LOS to ALMP Network Standard Option ADC Option Default configurations are in bold. AIS to Network Figure 26. H4TU-R LOS and AIS Response Priorities OCT55 T AMI L ATTERN WITH The OCT55 test pattern can be used in unframed mode to stress the system and verify data integrity. In an SF or ESF framing mode, excessive zero anomalies may occur, which causes the H4TU-C to report ES, SES, and UAS errors according to ANSI T1.231-1997.

  • Page 50: Loopback Operation

    Testing LTPH-UM-1252-01 OOPBACK PERATION HiGain HDSL4 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 HDSL4 channels to the H4TU-R remote unit and H4D doublers (if present), the H4TU-C DSX-1 interface, and the H4TU-R DS1 channels to the customer.

  • Page 51: Generic Loopback Commands

    LTPH-UM-1252-01 Testing Generic Loopback Commands The HDSL4 Generic Loopback (GNLB) commands allows the use of inband codes to loop up either NLOC (4-in-7) or NREM (3-in-7) towards the network. Additionally, these inband codes loop up CREM (6-in-7) or CLOC (5-in-7) towards the customer. Either loopup condition can be terminated (looped down) with the 3-in-5, SMJK loopdown code.

  • Page 52: Loopback Test Procedures

    Testing LTPH-UM-1252-01 OOPBACK ROCEDURES The following sections provide step-by-step test procedures for verifying the integrity of the HDSL4 channels at every module location as well as the DS1 channels to the customer and the local DSX-1 interface. General Troubleshooting Tips If trouble is encountered on the DSX-1 interfaces of the H4TU-C, verify that the: •...
  • Page 53 LTPH-UM-1252-01 Testing Table 17. Summary of HDSL4 Generic Loopback Codes and Activation Methods Method of Activation Loopback Code Description Test Set Craft Port NLOC 1111000 DSX-1 signal is looped back to the network at the H4TU-C. 4-in-7 NREM 1110000 DSX-1 signal is looped back to the network at the H4TU-R.
  • Page 54 Testing LTPH-UM-1252-01 Loopbacks Toward Network TLOS* HRU-412 HRU-412 H4TU-C HDSL4 SPAN LOGIC HRU-412 All ones H4TU-R SMJK* HRU-412 HRU-412 H4TU-C HDSL4 SPAN 2-in-5 All ones 11000 HRU-412 H4TU-R FF02 NREM NREM* C742 ‡ 1110000 3-in-7 HRU-412 HRU-412 HRU-412 HRU-412 H4TU-C HDSL4 SPAN 3 in 7 All ones...

  • Page 55: A3Lb Test Procedures

    LTPH-UM-1252-01 Testing A3LB Test Procedures The H4TU-C 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 H4TU-C to enter the NLOC state. The Loopback Time-Out setting determines the duration of this loopback unless it is overridden by the reception of a second identical 16-bit loopup command before the timer expires.

  • Page 56: A5Lb Test Procedures

    Testing LTPH-UM-1252-01 A5LB Test Procedures Using the codes listed in Table 19, 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. Information specific to doublers is shown in bold type.
  • Page 57 To avoid this uncertainty, ADC recommends sending unframed IR commands. The H4TU-C 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 the Loopback Time-Out Option”...

  • Page 58: Loopback Testing Using A Maintenance Terminal

    Testing LTPH-UM-1252-01 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 inband code 11100 or the ESF-DL code (FF24).
  • Page 59 LTPH-UM-1252-01 Testing From Customer LINE T1 Test Set To Customer LINE H0049-A Line Unit Faceplate Figure 29. DSX-1 Testing Towards Customer To Network LINE T1 Test Set From Network LINE H0050-A Line Unit Faceplate Figure 30. DSX-1 Testing Towards Network To configure the DSX-1 LINE jacks for test access to the network or customer: Press to select the Config menu.

  • Page 60: Appendix A - Specifications

    Appendix A - Specifications LTPH-UM-1252-01 A - S PPENDIX PECIFICATIONS Power HDSL4 Span Voltage 0 or -185 Vdc (voltage is applied across Loop 1 and Loop 2) CO Supply -48 Vdc nominal (-42.5 Vdc to -56.5 Vdc) “Power Consumption” “Maximum Power Dissipation” “Maximum Current Drain”...

  • Page 61: Power Consumption

    LTPH-UM-1252-01 Appendix A - Specifications OWER ONSUMPTION The three most important power parameters of an H4TU-C are its maximum power consumption, maximum power dissipation, and maximum current drain. Table 20 describes line-powered and locally powered (remote) circuits on the maximum reach condition using 26 AWG wire.

  • Page 62: Loop Attenuation, Insertion Loss, And Reach

    Appendix A - Specifications LTPH-UM-1252-01 AXIMUM URRENT RAIN The maximum current drain is the maximum current drawn from the shelf power supply when its at its minimum voltage (-42.5 ). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in Table 20 on page 53 to determine the shelf fusing requirements for your particular H4TU-C applications.

  • Page 63: Fuse Alarm

    LTPH-UM-1252-01 Appendix A - Specifications Fuse Alarm Figure 32 shows the pinout for the H4TU-C card-edge connector. Pin 117 on the card-edge connector is a Fuse Alarm that is driven to -48 Vdc whenever its onboard fuse opens. H4TU-C-388 List 5A October 15, 2003...

  • Page 64: Craft Port

    Appendix A - Specifications LTPH-UM-1252-01 RAFT Figure 33 shows the pinout for the craft port connector and its connection to a DB-9 or DB-25 connector on a maintenance terminal. Terminal DB-9 Connector (DTE) H4TU-C DB-9 Connector (DCE) TD (Transmit Data) RD (Receive Data) Terminal DB-25 Connector...

  • Page 65: Appendix B - Functional Operation

    HDSL4 technology provides full-duplex services at standard T1 rates over two pairs of copper wire between an H4TU-C, H4Ds (if necessary), and an H4TU-R which comprise one ADC system. ADC systems use Overlapped Pulse Amplitude Modulation Transmission (OPAM) transceiver systems to establish two, full-duplex, 784 kbps data channels between the H4TU-C and a remotely located H4TU-R.

  • Page 66: Spectrum Issues

    ANSI T1.418-2000 HDSL4 standards. HiGain HDSL4 complies with GR-63-CORE, TR-TSY-000499, and GR-1089-CORE. The H4TU-C is compatible with the following DDM+ high-density shelves and associated equipment: • ADC HiGain HCS-402, 2-slot shelf with #150-1193-01 adapter • Larus FT2 1188 (23-inch, 28-slot, connectorized shelf) •...

  • Page 67: Appendixc - Product Support

    UPPORT 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. • Quotation Proposals Sales Assistance •...

  • Page 68: Appendix D - Abbreviations

    Appendix D - Abbreviations LTPH-UM-1252-01 D - A PPENDIX BBREVIATIONS ACO: Alarm Cutoff DBER: DS1 Bit Error Rate ADSL: Asymmetric Digital Subscriber Line Data Link AIS: Alarm Indication Signal DLC: Digital Loop Carrier ALM: Alarm DS1: Digital Signal, Level 1 ALMP: Alarm Pattern DSX-1: Digital Signal Cross-Connect, Level 1 AMI:...
  • Page 69 LTPH-UM-1252-01 Appendix D - Abbreviations LAIS: Line Alarm Indication Signal PWRF: Power Feed LATT: Loop Attenuation LBPV: Local Bipolar Violation RAI: Remote Alarm Indication LBTO: Loopback Timeout RAIS: Remote Alarm Indication Signal LED: Light Emitting Diode RDA: Remote Disconnect Alarm LLOS: Line (Unit) Loss of Signal RLOS: Remote (Unit) Loss of Signal...
  • Page 70 Appendix D - Abbreviations LTPH-UM-1252-01 October 15, 2003 H4TU-C-388 List 5A...

  • Page 71: Certification And Warranty

    ODIFICATIONS Any changes or modifications made to this device that are not expressly approved by ADC DSL Systems, Inc. voids the user's warranty. All wiring external to the products should follow the provisions of the current edition of the National Electrical Code.
  • Page 72 World Headquarters ADC Telecommunications, Inc. PO Box 1101 Minneapolis, MN 55440-1101 USA For Technical Assistance Tel: 800.366.3891 : LTPH-UM-1252-01 OCUMENT ´,c[¶70¨ 1267597...

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