ALESIS EC-1 AES/EBU INTERFACE CARD FOR THE M20 PROFESSIONAL 20-BIT DIGITAL RECORDER OWNER’S MANUAL FIRST EDITION VERSION 1.00 APPLIES TO M20 OPERATING SOFTWARE VERSION 1.
EC-1 AES/EBU Interface, Appendix E EC-1 MANUAL 1.
APPENDIX E EC-1 AES/EBU INTERFACE This document covers only those aspects unique to the EC-1 card and should be inserted into the binder with the M20 manual. TABLE OF CONTENTS Important Safety Instructions..............................................................................................................2 Safety symbols used in this product ...................................................................................................2 CE Declaration of Conformity............................
EC-1 AES/EBU Interface, Appendix E IMPORTANT SAFETY INSTRUCTIONS SAFETY SYMBOLS USED IN THIS PRODUCT This symbol alerts the user that there are important operating and maintenance instructions in the literature accompanying this unit. This symbol warns the user of uninsulated voltage within the unit that can cause dangerous electric shocks. All safety warnings in the M20 manual (pages v and vi) apply to the EC-1 as well.
Appendix E, EC-1 AES/EBU Interface October, 1998 EC-1 MANUAL 1.
EC-1 AES/EBU Interface, Appendix E ABOUT THE EC-1 The EC-1 is an optional AES/EBU protocol expansion card designed exclusively for the M20. It provides 8 simultaneous channels of AES/EBU digital audio inputs and outputs via eight XLR type jacks (four input channel pairs and four output channel pairs). The EC-1 may be installed directly into the M20’s rear panel for simple system integration and flexibility.
Appendix E, EC-1 AES/EBU Interface OVERVIEW OF MAIN FUNCTIONS ABOUT AES/EBU DIGITAL AUDIO The AES/EBU protocol is the most common professional standard for transmitting digital audio. It is a two-channel protocol designed for stereo pairs, so transmitting from the eight-channel ADAT M20 requires the use of four sets of AES/EBU jacks: four XLR male jacks for output, and four XLR female jacks for input.
EC-1 AES/EBU Interface, Appendix E INSTALLATION PRECAUTIONS Install the EC-1 only if you have had some experience with similar devices and feel competent to do so. If the following instructions are not clear to you, have your dealer or a trained technician install it for you. Hazardous voltages are present within the chassis. Do not remove the top panel without first unplugging the unit from AC power! EC-1 CONNECTION TO M20 MAIN CIRCUIT BOARD The EC-1 comes with a 40-pin flexible cable.
Appendix E, EC-1 AES/EBU Interface BASIC OPERATION SELECTING AES/EBU (I/O CARD) AS THE DIGITAL SOURCE When using digital inputs, the Digital Source function selects one of three digital input options. The I/O CARD option will appear in the display only if an I/O card (such as the Alesis EC-1 card) is installed in the M20. With the EC-1 card installed, pressing the Digital Source button (next to the meter display) toggles through the available sources, such as ADAT OPTICAL, TRACK COPY, and I/O CARD.
EC-1 AES/EBU Interface, Appendix E Once again, we must remind you: if independent (non-synchronous) AES/EBU sources are connected to the EC-1 card, audio cannot be monitored (or recorded) simultaneously since the clock for each input channel pair is independent. When monitoring AES/EBU digital audio from more than one channel pair, all of the AES/EBU sources must be synchronous, i.e., controlled by the same sample clock.
Appendix E, EC-1 AES/EBU Interface Note: The above illustrations assume that the source tracks of the M20 are set to receive digital input (as shown by a “D” under the meter for each track). IF THE INPUT SELECTION IS ANALOG AND AES/EBU SIMULTANEOUSLY: If you have INPUT SELECT configured for analog and AES/EBU input, input routing must use the one-to-one configuration. This is the case because using any other bus configuration will route the selected I/O card digital source tracks (e.g.
EC-1 AES/EBU Interface, Appendix E E-10 EC-1 MANUAL 1.
