ClearOne GT1524 Installation & Operation Manual
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ClearOne GT1524 Installation & Operation Manual

Single channel echo canceller
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GT1524 Single Channel Echo Canceller
Installation & Operation Manual

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Summary of Contents for ClearOne GT1524

  • Page 1 Audio Products GT1524 Single Channel Echo Canceller Installation & Operation Manual...
  • Page 2 GT1524 Single Channel Echo Canceller Installation & Operation Manual...
  • Page 3 © 2002 ClearOne Communications, Inc. All rights reserved. No part of this document may be reproduced in any form or by any means without written permission from ClearOne Communications, Inc. Printed in the United States of America. ClearOne Communications reserves specific privileges. Information in this document is subject to change without notice.

  • Page 4: Table Of Contents

    Sales and Customer Service ......2 ClearOne Communications EuMEA GmbH ....2 Product registration .
  • Page 5 APPENDICES ......... .19 Appendix A: Specifications .

  • Page 6: Chapter 1: Introduction

    CHAPTER 1: Introduction The GT1524 provides the highest possible audio quality available in a single channel echo canceller. It features an integrated telephone interface that enables telephone participants of an audio or video conference to sound as if they are actually in the same room.

  • Page 7: Professional Services Group

    We welcome and encourage your comments so we can continue to improve our products and serve your needs. ClearOne Communications ~ 1825 Research Way ~ Salt Lake City, UT 84119 Technical Support Telephone: 1.800.283.5936 (USA) or 1.801.974.3760...

  • Page 8: Unpacking

    A. LCD window. The two-line, 16-character-per-line LCD display is used for Figure 1.2. GT1524 Front Panel Controls the GT1524 setup. Level adjustments are made through a menu system and four front-panel buttons [B]. Functions that can be accessed through the front-panel LCD include setup, programming, troubleshooting, and numeric audio level and gain readouts.

  • Page 9: Rear Panel

    Pressing and holding the On button for more than two seconds while the GT1524 is active sends a noise burst to readapt the unit to the phone line. A short tone (1000Hz) is sent out the Speaker and Line outputs to indicate that the GT1524 is connected to the line.

  • Page 10: Operational Requirements

    Operational Requirements Equipment placement The GT1524 is designed for mounting in a 19-inch equipment rack. (Do not block any of the ventilation holes.) With a desktop kit, the GT1524 can be modified for tabletop placement. Telephone line requirements The GT1524 operates on a standard analog telephone line and connects to the telephone system with a standard RJ-11C modular jack.
  • Page 11 Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760...

  • Page 12: Chapter 2: Installation

    CHAPTER 2: Installation Hardware Setup This chapter provides step-by-step instructions for installing your GT1524 system. Figure 2.1 (below) shows the back panel connections of a fully-installed GT1524 system. 5W, 8Ω Speaker Analog Telephone Line 4 WIRE/VIDEO CODEC AUX IN MIC/LINE IN...

  • Page 13: Lcd Programming

    50/60Hz, 22–30W. LCD Programming For most installations, the default settings in the GT1524 do not need to be changed; the system can be used as soon as power is applied. However, if you need to customize any settings, such as telephone connection options or input parameters, you can do so through the front panel user interface.
  • Page 14 (or are a list of values) will wrap around. When adjusting a parameter, press and hold the Up or Down button for more than two seconds to scroll through the values at a faster rate. GT1524 Parameters Worksheet System-Wide Parameters Program Parameter...
  • Page 15 Installation ~ LCD Programming Power-Up Screen ClearOne GT1524 Ve rsio n x.x Gain Adjust Mic/Line Input Mute Phantom Power Mic/Line In High Pass Filter Aux In Echo Canceller In p u ts 4 Wire In Gain Adjust From Telco Mute...

  • Page 16: Input Parameters

    Installation ~ LCD Programming Inputs There are four main submenus under the Inputs menu tree: Mic/Line In, Aux In, 4 Wire In, and From Telco (see Figure 2.7). Mic/Line In Gain Adjust. This adjusts the Mic/Line In submenus, including the level for the Input gain (ranging between -20dB and 20dB).
  • Page 17 If you enter a passcode Lock Panel and unlock the system, you The GT1524 can be secured from unauthorized adjustments by locking the front must lock it again after panel and establishing a user passcode. Menu items can still be viewed when the making any changes.
  • Page 18 Up, Down, Down, Enter.) Set Passcode Once you have unlocked the GT1524, you can change the passcode. Before the GT1524 allows passcode changes, the new passcode must be entered, then re-entered to validate it. The passcode must be five front panel buttons (in any combination or multiple).
  • Page 19 GT1524 times out. Timeout Disabling the timeout will The GT1524 has a system mode called Timeout. This parameter can be adjusted allow the GT1524 to through the RS-232 port only using the TOUT command. Timeout controls the delay...

  • Page 20: Chapter 3: Operation

    CHAPTER 3: Operation A correctly installed GT1524 virtually runs by itself. Typical operations involve changing volume of an output, muting an input or output, or handling calls on the connected telephone handset. For most installations, a custom remote control (optional) is also used.

  • Page 21: Answering A Call

    Answering a call An incoming call rings on the telephone set connected to the GT1524 (and speaker, if one is connected to the GT1524) and causes the On LED to flash. There are four ways to answer an incoming call:...

  • Page 22: Custom Control

    ~ Custom Control Custom Control Custom controller options The GT1524 is designed to function with remote control systems. The controller is ClearOne Communications connected to the GT1524 through the RS-232 port. The AP IR Remote also recommends use of a functions with the GT1524.
  • Page 23 Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760...

  • Page 24: Appendices

    Appendices Appendix A: Specifications Dimensions (LxDxH) Telco Line Echo Cancellation: 120ms tail time (works with 12dB of room gain) 17.25" x 10.25" x 1.75" RJ-11 connector Phantom Power: 24V, selectable 43.8 x 26 x 4.5 cm POTS (plain old telephone service) line or analog extension from PBX Weight AUX In...

  • Page 25: Appendix B: Pinouts

    Appendix B ~ Pinouts Appendix B: Pinouts Control/Status port pinout (female) Definable Type Default Description Control Aux In to Aux Out toggle Status Status of Aux In to Aux Out Control Mute Mic/Line In toggle Figure B.1. DB-25 connector Status Status of Mic/Line In mute Telephone On/Off toggle Status of tel.

  • Page 26: Appendix C: Serial Commands

    ~ Serial Commands Appendix C: Serial Commands The GT1524 accepts serial commands through the serial port. The commands in this manual pertain only to the GT1524. RS-232 serial port protocol is 9,600 (default), 19,200, or 38,400 baud; 8 bits, 1 stop bit, no parity.
  • Page 27 Appendix C ~ Serial Commands GT1524 Serial Commands Command Function Selects/Reports Auto Answer for Telco Port Selects/Reports Auto Disconnnect for Telco Port Enables/Disables AGC† AUXMIX Enables/Disables Mic/Line In and Aux In to Aux Out BAUD Sets/Reports RS-232 Port Baud Rate...
  • Page 28 Appendix C ~ Serial Commands This command activates and deactivates the auto answer feature. Command form: AA <X> Explanation Value 0 = Disables auto-answer 1 = Enables auto-answer 2 = Toggles between states (regardless of current state) Null = Reports back the current state Return values The command will return the updated condition (On=1, Off=0) of the auto answer in the same format as the command.
  • Page 29 The command will return the updated condition of the Aux Mix in the same format as the command. BAUD This command selects or returns the baud rate for the RS-232 port on the GT1524. Command form: BAUD <X> Explanation Value...
  • Page 30 Appendix C ~ Serial Commands DIAL This command generates DTMF tones. This capability remains active after the call is placed so tones can be issued for use with voice mail and pagers. Command form: DIAL <STRING> Explanation STRING is any valid combination of touch tone characters. A comma indicates a two-second pause.
  • Page 31 1 = Sets flow control to On Null = Returns the current mode Return values The command will return the updated condition (On=1, Off=0) of the GT1524 in the same format as the command. This command sets and reports the current passcode setting for the GT1524.
  • Page 32 Appendix C ~ Serial Commands Example The following command lowers the gain 3dB on the Mic/Line input channel. GAIN 1 I -3 HOOK This command sends a momentary interruption in the line seizure (hook flash) to the telephone line. Command form: HOOK Return values If hook flash succeeded, the following is returned out the port: HOOK 0 HOOKD...
  • Page 33 Appendix C ~ Serial Commands This command reports back the level for a given channel. Command form: LVL <CH> <X> Explanation Channel 1 = Mic/Line Input, Line Output 2 = Aux Input, Aux Output 3 = 4 Wire Input, 4 Wire Output 4 = Telco Input, Telco Output Value I = Specifies an input meter...
  • Page 34 3=Aggressive) of the nonlinear processing in the same format as the command. NULL This command sends a short noise burst down the telephone line and adapts the GT1524 to the telephone line. Command form: NULL Return values NULL is returned out the serial port when the command has been executed.
  • Page 35 Appendix C ~ Serial Commands This command changes or reports back the state of the phantom power for a microphone. Command form: PP <X> Explanation Value 0 = Sets the state to Off 1 = Sets the state to On Null = Returns the current state Return values The command will return the updated condition (On=1, Off=0) of the phantom...
  • Page 36 If the current state is On, the following is returned: TE 1. If the current state is Off, the following is returned out the serial port: TE 0 TERL This command reports back the telephone echo return loss (TERL) for the GT1524 in decibels. Command form: TERL Example...
  • Page 37 This command returns the unique ID number, the device type, and the device number of the GT1524. This command is read only. The unique ID number is preprogrammed at the factory and is unique to the unit. Command form: UID Return Values UID returns the device type and unique ID number.

  • Page 38: Appendix D: Warranty

    Appendix D ~ Warranty Warranty ClearOne Communications, Inc. (Manufacturer) warrants that this product is free of defects in both materials and workmanship. Should any part of this product be defective, the Manufacturer agrees, at its option, to: A. Repair or replace any defective part free of charge (except transportation...

  • Page 39: Appendix E: Compliance

    This warranty extends only to the original end user and is not assignable or transferable. This Warranty is governed by the laws of the State of Utah, without regard to the conflicts of interests provisions thereof. ClearOne Communications 1825 Research Way Salt Lake City, Utah 84119...
  • Page 40 If you experience problems with this equipment, contact ClearOne Communications, Inc., 1825 Research Way, Salt Lake City, Utah 84119, or by phone at (801) 874-3760 for repair and warranty information. If the trouble is causing harm to the telephone network, the telephone company may request you remove the equipment from the network until the problem is resolved.
  • Page 41 In the event of problems, you should contact your equipment supplier in the first instance. ClearOne Communications, Inc. of 1825 Research Way, Salt Lake City, Utah 84119, U.S.A. declares that this equipment is designed to be compatible with the following networks: Austria, Belgium, Denmark, Finland, France, Germany,...

  • Page 42: Index

    Index ~ A–R Index 4 Wire In 4, 8, 19 4 Wire Out 4, 8, 12, 19 high-pass filter 11 acoustic echo cancellation 1 inputs 14 AGC 11, 12 installation 7 answering a call 16 AP IR Remote 8 auto-answer 13, 16 LCD display 3, 8 auto-disconnect 13, 16 LCD panel 14...
  • Page 43 Index ~ S–Z TERLE 4, 14 timeout 14 serial commands 21 To Telco 12 set passcode 12, 13 touch-tone dialing 1 speaker 5, 8 two-wire/four-wire operation 1 Speaker/Line Out 12, 19 system 12, 13 Unit ID 12, 14 unmute 15 technical support 2 telco 12, 13, 19 telco echo cancellation 1...
  • Page 44 ClearOne Communications ~ 1825 Research Way, Salt Lake City, UT 84119 ~ tel 1-800-945-7730 ~ fax 1-800-933-5107...

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