Harmonic PWRLink II 4800T Series Product Manual
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Harmonic PWRLink II 4800T Series Product Manual

Harmonic PWRLink II 4800T Series Product Manual

Optical transmitter
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PWRLink™ II 4800T Series
Optical Transmitter
Product Manual
Manual Part No.: 700-0051934
Rev A
February 2002

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Summary of Contents for Harmonic PWRLink II 4800T Series

  • Page 1 PWRLink™ II 4800T Series Optical Transmitter Product Manual Manual Part No.: 700-0051934 Rev A February 2002...
  • Page 2 Copyright 2002 Harmonic Inc Harmonic continues to improve and enhance all product designs. Specifications are subject to change without notice. Harmonic and logo design, eXchange, MAXLink, METROLink, NETWatch, PWRBlazer, TRANsend, and “Redefining the Network” are trademarks of Harmonic Inc. YAGLink and PWRLink are registered trademarks of Harmonic Inc.

  • Page 3: Table Of Contents

    Table of Contents Chapter 1 Overview About This Manual ..........1-1 Description .
  • Page 4 A.8 Models Available ..........A-4 Appendix B HLP 4200WD Menu Display Copyright © 2002 Harmonic Inc.

  • Page 5: Chapter 1 Overview

    Description The PWRLink II 4800T transmitter is a compact plug-in module designed for use in the Harmonic HLP 4200 equipment platform. An HMC 4000 module carrier is needed to mount the transmitter in the platform. Harmonic has optimized the PWRLink II 4800T series family of transmitter modules for high-performance transmission of RF broadband information over optical fiber networks.
  • Page 6 Transmitter performance is optimized by combining state-of-the-art 1310 nm DFB (distributed feedback) laser technology and patented pre-distortion linearization circuitry. Harmonic has designed the PWRLink II family for integration into networks with advanced element management systems; each transmitter module employs a microprocessor-based communication and monitoring architecture.
  • Page 7 Figure 1-2. PWL 4800T block diagram The PWL 4800T transmitter is a compact plug-in module that mounts easily in Harmonic’s HLP 4200 platform via the HMC 4000 module carrier. See Figure 1-3 for a functional diagram of the HLP 4200 platform. The transmitter module draws power from the platform’s 24 VDC power bus, and...

  • Page 8: Applications

    45 to 870 MHz frequency band. The 1310 nm optical signal transmitted by a PWRLink II module can be received by optical receivers and nodes manufactured by Harmonic or other major broadband equipment manufacturers. To learn more about equipment compatibility and broadband network design and optimization, contact customer service.

  • Page 9: Chapter 2 Installing The Pwrlink Ii Transmitter

    Save the shipping material for future use. If the container or the equipment is damaged, notify both the freight carrier and Harmonic. See Appendix C, Harmonic Inc. – Offices for contact information. CAUTION: Before removing equipment from its antistatic bag, touch a ground point for several seconds.
  • Page 10 The carrier is powered by the +24 VDC bus of the HLP 4200. For additional information on the HLP 4200 platform, see the HLP 4200 Instruction Manual. For additional information on platform controllers and/or power supply options, see the respective Harmonic manual for each component . 2–2...

  • Page 11: Connecting The Fiber Cable

    Section 2.2. 2. Determine the connector type on the PWRLink II transmitter. The standard optical connector recommended by Harmonic is SC/APC. Other connector types can be special ordered. 3. Verify that the type of connector on the fiber cable is the same as what is on the PWRLink II transmitter, for example the SC/APC.

  • Page 12: Testing Rf Signal Input

    (female F-type) located on the front panel of the transmitter module, as shown in Figure 1-1 on page 1-2. The monitor level is 20 dB below the input level to the transmitter ±1 dB. 2–4 Copyright © 2002 Harmonic Inc.

  • Page 13: Chapter 3 User Interface Options

    PWRLink II transmitter performance. The Autosetup and Reset to Factory Settings commands are available only through this interface. For initial setup of the transmitter, Harmonic recommends using the HLP 4200WD display, if available. • NETWatch Site Controller Element Management System Once installed and configured, NETWatch Site Controller provides a...
  • Page 14 NETWatch Site Controller. Instructions for navigating the Main menu are provided in Section 4.4.1 Step- by-Step Setup Instructions on page 4-7. Figure 3-1. HLP 4200WD platform Main menu display 3–2 Copyright © 2002 Harmonic Inc.
  • Page 15 HLP 4200WD Display After you navigate the HLP 4200WD’s Main menu and select a specific PWRLink II module, the Transmitter menu appears. The Transmitter menu is organized into four sub-menus: • Transmitter Status • Transmitter Setup • Transmitter Adjustments • Transmitter Alarms These sub-menus are described below in Section 3.1.1 through Section 3.1.4.
  • Page 16 User Interface Options Modulation Figure 3-2. HLP 4200WD platform Transmitter menu display chart 3–4 Copyright © 2002 Harmonic Inc.

  • Page 17: Transmitter Status

    Transmitter Alarms menu. NETWatch Site Controller Harmonic’s NETWatch Site Controller provides a complete element management system, including a Windows™-based GUI and communications package for monitoring and controlling a network of multiple PWRLink II transmitters either remotely or locally.

  • Page 18: Front Panel Rf Adjustment

    User Interface Options Front Panel RF Adjustment NOTE: Harmonic recommends that you use the front panel RF Adjustment control only if the interface options described in Section 3.1 and Section 3.2 are not available. The PWRLink II transmitter front panel includes an RF adjustment control, labeled RF Adj , as shown in Figure 1-1 on page 1-2.

  • Page 19: Chapter 4 Transmitter Setup

    Transmitter Setup This chapter describes how to set up a PWRLink II 4800T series transmitter for optimum performance. Any of the three user interface options described in Chapter 3, User Interface Options, can be used for transmitter setup. The first half of this chapter describes transmitter features and setup options.

  • Page 20: Factory-Optimized Settings

    Transmitter Setup Factory-Optimized Settings The Harmonic factory optimizes the performance of each model in the PWL 4800T series (PWL 4802T through PWL 4814T) prior to shipment. The factory setup is listed in Table 4-1. Table 4-1: Factory Setup Loading 76 unmodulated System B/G (PAL) channels from 45 to 870 MHz;...

  • Page 21: Fine Tuning Each Transmitter

    Gain Control The Autosetup feature enables you to quickly set the internal drive level to the laser as close as possible to the optimal value determined at the Harmonic factory. The transmitter operates in either the Automatic Gain Control (AGC) mode or the Manual Gain Control (MGC) mode.

  • Page 22: Autosetup

    Then, it sets the attenuator pad so that the average RF drive level to the laser is at the same optimal value determined at the Harmonic factory using CW carriers. 2. Once this is done, the menu asks you to choose between CW Mode and Video Mode.
  • Page 23 Number of PAL B/G channels Figure 4-2. RF drive level as a function of channel loading Even if you plan to add more video channels in the future, Harmonic recommends that you use 16 dBmV/ch to ensure that the system is easy to upgrade.

  • Page 24: Automatic Gain Control (Agc) And Manual Gain Control (Mgc)

    When you select AGC, the input level to the transmitter laser remains at its previously established value. When you use AGC mode with the PWL 4800T, Harmonic recommends that you drive the transmitters 3 dB harder so that they can better compensate for the increased variation in the RF input signal.

  • Page 25: Setup Via Hlp 4200Wd Display

    Setup via HLP 4200WD Display Setup via HLP 4200WD Display This section provides instructions for setting up the PWRLink II 4800T series of transmitters via the push buttons and LCD display of the HLP 4200WD equipment platform. To quickly and easily set up and review the PWRLink II monitoring and control parameters, use the HLP 4200WD front panel.

  • Page 26: Fine Tuning The Transmitter

    5. A message appears, telling you that all settings will be changed. Press Enter. 6. A message appears, <ESC> TO ABORT OR <SET+UP/DN> TO SWITCH. Hold down the button and press , then press Enter. 7. A confirmation message appears. Press Enter. 4–8 Copyright © 2002 Harmonic Inc.

  • Page 27: Setup Via Netwatch Site Controller

    Use this interface only when the first two setup options, described in Section 4.4 and Section 4.5, are not available. NOTE: For initial setup of the transmitter, Harmonic recommends that you use the HLP 4200WD platform display interface, if available, and that you follow the setup procedure in Section 4.4...
  • Page 28 4. Using the RF Adj control on the front panel, adjust the RF input level to the value given in Table 4-1, Factory Setup, on page 4-2. For further details on how to use the RF adjustment switch see Section 3.3 Front Panel RF Adjustment on page 3-6. 4–10 Copyright © 2002 Harmonic Inc.

  • Page 29: Chapter 5 Maintenance

    (CNR) performance and, in some cases, distortion performance. Therefore, Harmonic recommends that you clean all mating fiber connectors, before connecting them to an optical transmitter. In addition, if you suspect that the optical connector of a PWL 4800T module may have been exposed to contamination (by a dirty fiber cable connector, for...

  • Page 30: Cleaning Patch Cord Or Pigtail Fiber Optical Connectors

    5.1.1 Cleaning Patch Cord or Pigtail Fiber Optical Connectors To clean optical connectors, Harmonic recommends using a fiber optic connector cleaning cartridge (such as NTT Cletop). If a cleaning cartridge is not available, follow these steps to clean the optical connector of a patch cord or pigtail.

  • Page 31: Fan Replacement

    PWRLink II transmitter module. Under normal headend and central office environmental conditions, the transmitter can operate without fan cooling for a limited time. Should a fan failure occur, contact Harmonic’s technical service (see Section Section 6.2). To replace the fan: 1.
  • Page 32 Maintenance 5–4 Copyright © 2002 Harmonic Inc.

  • Page 33: Chapter 6 Troubleshooting

    To return the unit, send it to the Harmonic Corporate Headquarters, and add the note: Atten: Customer Service. PWRLink II 4800T Optical Transmitter Product Manual Rev A (2/02)

  • Page 34: Warranty Summary

    This Harmonic Inc. hardware product is warranted against defects in material and workmanship for twelve (12) months from the date of shipment. Harmonic Inc. will, at its option, either repair or replace products that prove to be defective. We shall have no liability or responsibility to the customer or any other person with respect to any loss or damage caused or alleged to be caused directly or indirectly by equipment or software sold or furnished by us.

  • Page 35: Link Performance

    3,4,5 transmitter with 76 PAL (System B/G) channels running. Figure A-1. PWRLink II 4800T series CNR vs. optical fiber loss These performances specifications are typical, given for 100% fiber optical links. Subtract 1dB from CSO and CTB for worst-case performance.

  • Page 36: Optical Output

    Input level range per video channel: PWL 4802T to PWL 4814T: 16 to 22 dBmV Operational bandwidth: 45 to 870 MHz RF attenuator adjustment range: 10 dB Impedance: 75 ohm Return loss: >16 dB Level control: Manual (MGC)/Automatic (AGC) A–2 Copyright © 2002 Harmonic Inc.

  • Page 37: User Interface

    Technical Specifications User Interface Front panel Bi-state status LED: Normal = Green, Alarm = Red Module selection indicator: Yellow LED RF attenuation adjustment Monitor point: Monitor port to RF input: -20 dB Flatness: ±1.0 dB Return loss: >16 dB Connector type: Female F Rear panel RF input connector type: Female F Optical output (for connector types available, see Section A.8)

  • Page 38: Physical

    PWL 48xxT-zz xx = Model Number: 02 to 14 zz = Connector Type: AS, AF, US, UF or AE AS = SC/APC AF = FC/APC US = SC/UPC UF = FC/UPC AE = E2000 A–4 Copyright © 2002 Harmonic Inc.

  • Page 39: Appendix B Hlp 4200Wd Menu Display

    Appendix B HLP 4200WD Menu Display Figure B-1 and Figure B-2 provide a flowchart of the commands and messages in the Transmitter Menu of the HLP 4200WD platform display. In these figures, push-button commands are framed in ovals, and resultant display messages are framed in rectangular boxes.
  • Page 40 Figure B-1. HLP 4200WD platform Transmitter menu display, levels 0 and 1 B–2 Copyright © 2002 Harmonic Inc.
  • Page 41 HLP 4200WD Menu Display Figure B-2. HLP 4200 WD platform Transmitter menu display, level 2 PWRLink II 4800T Optical Transmitter Product Manual Rev A (2/02) B–3...
  • Page 42 B–4 Copyright © 2002 Harmonic Inc.
  • Page 43 C–2 Copyright © 2002 Harmonic Inc.

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