User Guide - Studio Technologies, Inc.
Contents
1. Each of the eight AES EBU outputs is individually configurable to have input A or input B as its source Eight DIP type switches located on the right side of the front panel are used to select the source Issue 3 November 1999 Page 10 for each output The legend on the switches corresponds to the output chan nel numbers A switch that is set to the up position sets its associated output channel for a source of input A A switch in the down position selects input B A small flat blade screwdriver may be of assistance when setting the switches Operation Now that you ve installed and configured the system you re ready to go You should find operation very easy there is almost nothing to do on a day to day basis For peace of mind the signal present LEDs will give you a visual indication whenever signals are present on the Model 85 s inputs Note that the signal present LEDs are not intended to provide an indication that valid AES EBU signals are present They are provided as a handy macro method of determining if signals are active on the inputs Each of the eight outputs is fully indepen dent You can patch reconnect or even short out an interconnecting cable without effecting the other outputs Using the front panel DIP switches you can change the output source of any or all of the outputs whenever you wish Troubleshooting If you re having problems getting the Model 85 up and running this section can2. appropriate for unbalanced analog signals but not for this fast movin digital cat Beyond containing a shield appropriate for digital signals the exact cable choice is up to you There is an inverse relationship Model 85 User Guide Studio Technologies Inc between cable capacitance and maximum allowable cable length The AES EBU specification calls for a 100 meter maxi mum but high performance cable should allow a longer run Part of the Model 85 s flexibility is the fact that each of the eight outputs can select as its source either input A or input B If you re using the unit strictly as a 1 input 8 output device only a connection to input A is required If some outputs have input A as their source and others have input B as their source then you ll need signals connected to both inputs AES EBU Outputs The Model 85 contains eight independent AES EBU outputs The signals are acces sible on the back panel by means of eight 3 pin XLR type male connectors Your cables will need to terminate on XLR type female connectors The recommendations made for the inputs also apply for the outputs maintain polarity wire for bal anced operation and select if appropriate a low capacitance cable AC Mains Power The Model 85 is internally configured to operate from either 100 120 or 220 240V 50 60Hz In most cases units shipped to North America are factory selected for 120V operation Units bound for Japan are
3. assist you when installing configuring and using the Model 85 AES EBU Digital Audio Distribution Amplifier System Overview The Model 85 provides two AES EBU digital audio inputs and eight AES EBU outputs Each of the eight outputs provides a fully isolated reproduction of either input Output source selection is provided by front panel DIP switches The Model 85 allows AES EBU signals to be distributed to multiple inputs receivers without incur ring data transmission errors A typical application would use the Model 85 to distribute the AES EBU output of a digital audio workstation DAW to devices such as DAT or CD recorders audio video storage systems tie lines to other facili ties etc Single rack space mounting standard XLR type connectors and status LEDs make installation of the Model 85 a simple Model 85 User Guide Studio Technologies Inc job The AC mains input power is factory configured for 100 120 or 220 240V operation Components and construction standards make the Model 85 suitable for continuous operation even for on air broadcast applications AES EBU Inputs Each of the two inputs have transformer coupling and DC voltage blocking An LED status indicator is associated with each input lighting whenever digital information is present AES EBU Outputs The Model 85 contains eight independent AES EBU output sections The rugged output circuits feature transformer cou pling For flexibili
4. help If you haven t read the other sections of this guide you should do so before proceeding Model 85 User Guide Studio Technologies Inc Studio oola If the Model 85 Doesn t Work At All A source of AC mains power must be connected to the Model 85 Depending on the version you have purchased 100 120 or 220 240Vac 50 60Hz is required Confirm what mains voltage is required by observing the selection boxes to the left of the AC mains connector on the back panel Whenever mains power is con nected the power present LED should be lit If the LED is not lit confirm that the main power source is active hot and that the connector on the cord is securely mated with the plug on the back panel For safety in the event of a major internal failure or the connection of incorrect AC mains voltage the Model 85 contains a fuse inside the cabinet The fuse will open blow if the failure of an internal compo nent causes excessive current to be drawn from the internal power supply The fuse will also open should 220 240Vac be connected to a Model 85 that is configured for 100 or 120Vac operation The fuse is intended to be replaced only by a qualified service technician This person will have the training to safely access the guts of the Model 85 and identify where a problem is located If Signal Doesn t Seem to Be Present on the Outputs Valid outputs depend on a valid input source Ensure that the signal
5. ready to go only when am completely satisfied With that in mind am sincerely pleased to present the Model 85 AES EBU Digital Audio Distribution Amplifier Many fine people worked toward making the Model 85 happen Mitch Budniak ace consulting engineer designed the circuitry Carrie Loving provided engineering support Ben Kamen designed the automatic testing routines Al Lux designed the printed circuit board Fred Roeck performed the mechanical design Joe Urbanczyk coordinated the safety testing and agency approvals l m always receptive to your comments and questions Please contact me via phone 847 676 9177 fax at 847 982 0747 or the Internet www studio tech com Sincerely Gordon K Kapes President Model 85 User Guide Issue 3 November 1999 Studio Technologies Inc Page 5 Studio oola This page intentionally left blank Issue 3 November 1999 Model 85 User Guide Page 6 Studio Technologies Inc Studio oola Introduction The Model 85 AES EBU Digital Audio Distribution Amplifier is designed by Studio Technologies as part of its Studio Tools group of audio support products Designed for a wide variety of recording production broadcast and duplication applications the Model 85 has two AES EBU inputs and eight AES EBU outputs All Model 85 functions meet or exceed the performance of the most expensive high end audio equipment What This User Guide Covers This User Guide is designed to
6. selected for 100V while our friends down under and in Europe receive units set for 220 240V Before connecting the Model 85 to AC mains power check that it is config ured to match the local mains voltage Look on the back panel adjacent to the power entry connector for the configured voltage s Note than an incorrect configu ration could seriously damage the unit Should it be necessary to change the Issue 3 November 1999 Page 9 Studio oola units operating voltage it must be per formed only at the factory or by an autho rized service technician The Model 85 uses an IEC standard connector to mate with the AC mains cord The wire colors in the AC mains cord should conform to the internationally recognized CEE color code and must be wired accordingly Connection Wire Color Neutral N Light Blue Line L Brown Protective Earth E Green Yellow Safety Warning The Model 85 does not contain an AC mains disconnect switch As such the mains cord plug serves as the disconnection device Safety consideration requires that the plug and associated outlet be easily accessible to allow rapid discon nection of mains power should it prove necessary As soon as AC mains power is connected the Model 85 s power present LED will light If a digital signal is active on an input its associated signal present LED will light The unit is now ready for years of trusty service Configuration Output Source Selection
7. 60 nanosecond input to output delay the outputs are essentially identical to the inputs Model 85 Front Panel Studio Toka INPUT A INPUT B es Bull SIGNAL PRESENT Installation In this section you will be installing the Model 85 in an equipment rack AES EBU input and output connections will be made using the ten XLR type connectors located on the back panel AC mains power will be connected to the Model 85 System Components The shipping carton contains a Model 85 User Guide and warranty card Units destined for North America are shipped with an AC mains cord Your dealer or distributor will provide an AC mains cord for non North American destinations MODEL 85 AES EBU DIGITAL AUDIO DISTRIBUTION AMPLIFIER OUTPUT SELE TECHN LOGIES nove FREE EE SKOKIE ILLINOIS U S A L Signal present LEDs Power present LED Model 85 Back Panel Output source select configuration switches AC MAINS INPUT CAUTION ALL INPUTS AND OUTPUTS AES EBU DIGITAL AUDIO os TRIBUTION AMPLIFIER o4A alpe Di oe OT TECHNOLO SIE INC Ase ante tudio outputs ea LEa y CG rE A 50 60Hz INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL 9 OUTPUT 4 outputs 9 2 8 output 9 INPUTA MADE IN USA AC mains connection Issue 3 November 1999 Page 8 AES EBU AES EBU outputs inputs Model 85 User
8. Guide Studio Technologies Inc Studio oola Mounting the Model 85 The Model 85 requires one space in a standard 19 inch 48 3cm equipment rack It is desirable to locate the Model 85 to allow easy access to both the front and the back panels The back panel contains the input and output connectors The front panel is used to access the output select switches The front panel also contains several LED indicators The Model 85 is secured to the equipment rack using two mounting screws per side AES EBU Inputs The Model 85 provides two AES EBU inputs Physically the inputs are located on the back panel and use standard 3 pin XLR type female connectors The source signals will need to terminate on cables with XLR type male plugs to connect with the inputs While its a good idea to always maintain consistent cable polarity the AES EBU specification clearly states that signal polarity is not an issue With this in mind understand that identifying one of the pins as hot or high is not really relevant For consistency the Model 85 does maintain input to output polarity A low to high transition on pin 2 of the input results in a low to high transition on an output For best performance you should consider AES EBU signals to always be a balanced differential signal Pins 2 and 3 of the XLR type connectors should carry signal and pin 1 is appropriate for shield Never strap pin 2 or pin 3 to pin 1 this might be
9. Stuko bola Model 85 AES EBU Digital Audio Distribution Amplifier User Guide Issue 3 November 1999 This User Guide is applicable for serial numbers Model 85 M85 00151 and later Copyright 1999 by Studio Technologies Inc all rights reserved 5520 West Touhy Avenue Skokie Illinois 60077 U S A Telephone 847 676 9177 Fax 847 982 0747 www studio tech com 50211 1199 Issue 3 Model 85 User Guide Studio Technologies Inc Studio oola Table of Contents PG WONG 5 7 What This User Guide Covers eerren 7 System 7 sisii a 8 10 10 Troubleshooting sidan 10 tanned sects 12 Block Diagram Issue 3 November 1999 Page 3 Studio oola This page intentionally left blank Issue 3 November 1999 Model 85 User Guide Page 4 Studio Technologies Inc Studio oola Foreword As both president and owner of Studio Technologies take a very personal approach when designing products Do the technical and operational aspects of a product work together to feel right Is the product something l d like to use in my own studio A new product from Studio Technologies is
10. present LEDs are lit in response to what you consider valid input signals Should a signal present LED not be lit confirm that the source is operating and the cabling has been correctly prepared On the front panel check the output source selection switches to confirm the correct settings Model 85 User Guide Issue 3 November 1999 Studio Technologies Inc Page 11 Studio oola Specifications AES EBU Inputs 2 Type capacitor isolated transformer coupled Receiver Equalization none Impedance 110 ohms nominal Amplitude Range 0 3 to 7 Vp p AES EBU Outputs 8 Type transformer coupled Impedance 110 ohms nominal Level 4 5 Vp p terminated nominal Input Output Time Delay 60nSec nominal AES EBU Performance Compatibility Designed for compliance with AES3 1992 ANSI 4 40 1992 AES Recommended practice for digital audio engineering Serial transmission format for two channel linearly represented digital audio data LED Indicators 3 Function 1 power present 2 signal present Fusing 1 Type 5 x 20mm time lag Littelfuse 218 series or equivalent Rating 0 400A for 100 and 120V mains power 0 200A for 220 240V mains power Issue 3 November 1999 Page 12 Connectors AES EBU 3 pin XLR type female 2 male 8 AC Mains standard 3 blade plug meets IEC 320 specifications AC Mains Requirement 100 120 or 220 240V 10 factory configured 50 60Hz 100 120V 0 4A maximum 220 240V 0 2A maxim
11. ty each of the eight outputs can individually select input A or B as its source This allows the Model 85 to act as a single 1x8 distribution amplifier DA or two fully independent DAs Example configurations include creating a dual 1x4 DA or a combination 1x3 DA and 1x5 DA Technical Background The original AES EBU specification AES3 1985 called for a single transmitter to drive up to three receivers In practice this proved to make data transmission susceptible to errors as an impedance mismatch is created whenever more than one receiver is driven The revised edition of the specification AES3 1992 advises that a single transmitter should drive only a single receiver The Model 85 addresses this requirement in a simple reliable manner Up to eight identical but fully isolated copies of the original source are created Issue 3 November 1999 Page 7 Studio oola No Data Manipulation The Model 85 performs minimal process ing to the AES EBU digital audio data The signal is received converted to a standard logic signal then retransmitted using rugged driver circuits No timing correc tion is performed No data is manipulated added or changed The Model 85 as sumes that your digital signals have been carefully created and simply need to be distributed to multiple inputs In an age when everyone wants to fix your digital signals the Model 85 takes a hands off approach With a nominal
12. um Dimensions Overall 19 00 inches wide 48 3cm 1 72 inches high 4 4cm 6 65 inches deep 16 9cm Mounting one standard rack space Weight 7 0 pounds 3 2kg Specifications and information contained in this User Guide subject to change without notice Model 85 User Guide Studio Technologies Inc AES EBU INPUT A XLR F AES EBU INPUT Be XLR F XA A o DIFFERENTIAL ae a AC MAINS FACTORY CONFIGURABLE FOR 100 120 or 220 240V 50 60Hz OPERATION LINE RECEIVER DIFFERENTIAL D LINE DRIVER LOGIC SWITCH AM i 9 lt i i gt 3 ie i B SOURCE J SELECT SWITCH CIRCUITRY FOR OUTPUTS 2 8 IDENTICAL TO OUTPUT 1 e 5V BUFER SIGNAL PRESENT SF INPUT Ase 5V SIGNAL PRESENT INPUT Bes aye POWER R FUSE POWER SUPPLY v LOCATED ON BACK PANEL LOCATED ON FRONT PANEL DIP TYPE SWITCH LOCATED ON FRONT PANEL AES EBU OUTPUT 1 XLR M MB5BD_C STUDIO TECHNOLOGIES INC MODEL 85 AES EBU DIGITAL AUDIO DISTRIBUTION AMPLIFIER BLOCK DIAGRAM DRAWING NO DATE PAGE 30476 06 01 94 01 o 01
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