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Chapter 1: Introduction to the FC726

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Chapter 1: Introduction to the FC726

The FC726 is a compact, 2U, digital-audio format converter that translates back and forth between MADI (Multichannel Audio 
Digital Interface) and the digital audio formats listed in the table below. AES/EBU outputs are always available, regardless of the 
formats being translated. The FC726 performs the highest quality sample-rate conversion (SRC) on all channels that require it. 

The FC726 includes the following features:

• Can apply different format conversion and/or SRC to each bank of eight channels.

• Automatically applies SRC when necessary but can be manually disabled.

• Performs format conversion and SRC on more channels (56) than other devices. 

• Each of the 56 channels is bidirectional.

• Supports 24-bit audio at a 96 kHz sample rate.

• Maintains compatibility with older devices by offering 16- or 20-bit dithering and supporting 96 kHz legacy standards.

The FC726 lets you transfer digital audio between incompatible devices, including:

• Mix down on a System 5 digital console at 24-bit 96 kHz with source material from a ProDigi or Sony tape machine at 48 kHz 

(automatic SRC).

• Transfer tracks from a Tascam DA-88, Sony 3348, or Alesis ADAT to a Euphonix R-1.

Digital audio formats supported by the FC726

Company/Organization

Format Name

Equipment Using Format

Transmission Medium

Audio Engineering
Society

MADI

Euphonix R-1, S-5; many large 
format digital consoles

BNC cable

AES/EBU  (AES-3)

Most DAT machines and stereo 
D/A devices, sound cards, 
effects processors 

Two balanced XLR 
cables

Tascam

TDIF-1 (Teac Digital 
Interface Format)

Tascam DA-88, DA-98, small 
format digital consoles and 
workstations

25-pin cable

Mitsubishi

ProDigi

Otari and Mitsubishi digital 
multitracks

Two 50-pin cables

Sony

SDIF-2

Sony 3324 and 3348

Two 50-pin cables

Summary of Contents for FC726

Page 1: ...FC726 Guide System 5...

Page 2: ...dio MachineControl Maxim Mbox MediaComposer MIDI I O MIX MultiShell Nitris OMF OMF Interchange PRE ProControl Pro Tools Pro Tools HD QuickPunch Recti Fi Reel Tape Reso Reverb One ReVibe RTAS Sibelius...

Page 3: ...ont Panel 5 Back Panel 7 Chapter 3 Operating Instructions 11 SDIF 2 11 TDIF 11 ADAT 11 ProDigi 11 AES 12 Converting Between Formats 12 Specifications 13 Appendix A Pinout and Cable Specifications 15 A...

Page 4: ...FC726 Guide iv...

Page 5: ...rate Maintains compatibility with older devices by offering 16 or 20 bit dithering and supporting 96 kHz legacy standards The FC726 lets you transfer digital audio between incompatible devices includ...

Page 6: ...e that format is selected If both are connected the common DB 50 signal takes precedence Format A Adapters To create a compact 2U device with maximum flexibility the FC726 uses a common DB 50 connecto...

Page 7: ...Register your purchase online Support and Downloads Contact Avid Customer Success tech nical support download software updates and the latest on line manuals browse the Compatibility documents for sy...

Page 8: ...FC726 Guide 4...

Page 9: ...or AES devices ON ALT Selects MADI running at sample rate 96 kHz frame rate 48 kHz 2 SRC ENABLE Button This button lights when the FC726 detects different sample rates on the A and B formats and SRC i...

Page 10: ...20 or 16 the sig nal is dithered to the selected number of bits before being out put to the Format A device 5 FORMAT B Sample Rate LEDs These LEDs indicate the Format B sample rate If the rate is not...

Page 11: ...er face with non Avid MADI devices At 48 kHz MADI A pro vides 24 bit audio on 56 channels At 96 kHz only 28 24 bit audio channels 1 28 are available 5 Service DB 9 Jack This jack connects to a PC seri...

Page 12: ...t B Sync Input Switch 8 AES STEREO AES MONO Set this switch to AES Stereo up for the normal configuration where each AES signal contains two discreet channels If the sample rate is above 52 kHz such a...

Page 13: ...THRU This connector outputs a copy of the Format B AES Sync In signal 14 Format B WORD SYNC IN Connect a word sync signal to this BNC connector to synchro nize the Format B MADI signal According to th...

Page 14: ...FC726 Guide 10...

Page 15: ...d if the MADI B device runs at 96 kHz and the TDIF device at 48 kHz The TDIF and MADI B devices can each run on their own internal sample clocks without additional sync signals ADAT 1 Connect the ADAT...

Page 16: ...AES input is not present This mode should be used to lock the connected AES device to the AES output of the FC726 Converting Between Formats Using Two Units 56 Bidirectional Channels 1 Connect Format...

Page 17: ...Party I O DB50 MADI BNC 75 Signal to Noise Ratio 144 dB unweighted 120 dB unweighted with SRC engaged Group Delay SRC Off 4 Fs SRC On 4 Fs ms delay 43 Fs input 45 Fs output Format B MADI Inputs BNC 7...

Page 18: ...FC726 Guide 14...

Page 19: ...1 AMP HD 20 series DB25 M D sub shell 2 1 meter Mogami 3162 AES EBU snake cable Alternate Belden 1805A AES EBU snake cable 3 4 Neutrik NC3MX 3 p XLR M 4 4 Neutrik NC3FX 3 p XLR F 5 2 inch 75 OD shrin...

Page 20: ...4 Out HOT Pin 11 Channel 5 6 Out COLD Pin 12 Channel 7 8 Out GND Pin 13 Channel 7 8 Out HOT Pin 14 Channel 1 2 In GND Pin 15 Channel 1 2 In HOT Pin 16 Channel 3 4 In COLD Pin 17 Channel 5 6 In GND Pin...

Page 21: ...23 1 NC 0 tie to pin 23 21 Bit Clk In NC NC Bit Clk In Bit Clk In 22 Bit Clk In NC NC Bit Clk In NC 23 GND GND GND GND GND 24 Word Clk In NC In LR Clk Word Clk In Word Clk In 25 Word Clk In NC NC Word...

Page 22: ...TEM 1 DB 50 male metal backshell assembly including thumb or jack screws ITEM 2 DB 25 male with metal backshell assembly Cable labels typical J1 TDIF ITEM 3 SCSI cable braided shield low capacitance 2...

Page 23: ...J1 23 J2 17 J1 18 J1 20 GND J1 24 J2 5 Word Clock In J1 25 NC J1 26 NC J1 27 J2 13 Out 1 2 J1 28 NC J1 29 J2 12 Out 3 4 J1 30 NC J1 31 J2 11 Out 5 6 J1 32 NC J1 33 J2 10 Out 7 8 J1 34 J2 8 FS0 Out J1...

Page 24: ...inations 10 inches in sheath add tubular braided shield then insulating outer protective covering heat shrink Intersection Tie together and solder all shields from the two 25 pair trunks and the three...

Page 25: ...23 Cable ID J1 19 J1 23 Cable ID J1 20 NC Cable ID J1 21 NC J1 22 NC J1 23 J1 18 19 GND J1 24 NC J1 25 NC J1 26 J5 2 Out 1 J1 27 J5 1 Out 1 J1 28 J5 6 Out 3 J1 29 J5 5 Out 3 J1 30 J5 10 Out 5 J1 31 J5...

Page 26: ...7 In 14 J2 16 J4 32 In 16 J2 17 J4 31 In 16 J2 18 J2 23 Cable ID J2 19 J2 23 Cable ID J2 20 NC Cable ID J2 21 NC J2 22 NC J2 23 J2 18 19 GND J2 24 NC J2 25 NC J2 26 J5 18 Out 9 J2 27 J5 17 Out 9 J2 28...

Page 27: ...In 22 J3 15 J4 43 In 22 J3 16 J4 48 In 24 J3 17 J4 47 In 24 J3 18 J3 23 Cable ID J3 19 J3 23 Cable ID J3 20 NC Cable ID J3 21 NC J3 22 NC J3 23 J3 18 19 GND J3 24 NC J3 25 NC J3 26 J5 34 Out 17 J3 27...

Page 28: ...to destinations 10 inches in sheath add tubular braided shield then insulating outer protective covering heat shrink Intersection Tie together and solder all shields from the two 25 pair trunks and th...

Page 29: ...6 In 6 J1 15 J3 23 In 6 J1 16 J3 8 In 8 J1 17 J3 25 In 8 J1 18 J1 23 Cable ID J1 19 NC Cable ID J1 20 NC Cable ID J1 21 J3 34 Bit Clk In J1 22 J3 35 Bit Clk In J1 23 J1 18 GND J1 24 J3 36 Word Clk In...

Page 30: ...15 J3 31 In 14 J2 16 J3 16 In 16 J2 17 J3 33 In 16 J2 18 J2 23 Cable ID J2 19 NC Cable ID J2 20 NC Cable ID J2 21 NC J2 22 NC J2 23 J2 18 GND J2 24 NC J2 25 NC J2 26 J4 9 Out 9 J2 27 J4 26 Out 9 J2 28...

Page 31: ...help conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment For more information about where you can drop off your waste equipment for re...

Page 32: ...ormity to EMC Directive 2004 108 EC and Low Voltage Directive 2006 95 EC Communication Statement Note This equipment has been tested and found to comply with the limits for a Class A digital device pu...

Page 33: ...ime 14 Refer all servicing to qualified service personnel Servicing is required when the equipment has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or o...

Page 34: ...FC726 Guide 30...

Page 35: ......

Page 36: ...ro Serra Boulevard Daly City CA 94014 3886 USA Technical Support USA Visit the Online Support Center at www avid com support Product Information For company and product information visit us on the web...

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