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How to Configure Passthru Audio

Adtec EN-Series encoders have the flexibility to meet many demanding audio requirements.
Each model contains specific encoding options, but every Adtec EN-Series encoder supports
two audio passthrus. An audio passthru consists of a compressed bitstream ( Dolby E 20
Bit / Dolby E 16 Bit / Dolby Digital / Linear Acoustic Stream Stacker 2 ) or an uncompressed
stereo pair ( LPCM ) from an embedded SDI or AES input passed into the egress transport
stream ( IP, RF, ASI ).

The encoder supports two passthru audios on the first four audio inputs. The SDI Matrix
and ASI Tranport Stream PID configurations allow for custom configurations if required.

Every audio input engine has an internal SDI Matrix to route any audio to one or multiple
inputs. Each audio engine output can be assigned a user configurable PID in the transport
stream to meet any job requirement.

If the passthru audio is coming in via embedded SDI, the SDI Audio Matrix may be used in
conjunction with the ‘PID’ tab to manipulate the input and output routing.

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Содержание EN-91

Страница 1: ...EN 91 EN 91P MPEG 4 DSNG Encoder Includes modulator versions LB and IF USER GUIDE 04 15 13 v1 01 05 ...

Страница 2: ...arnings and Cautions Compliance Notices FCC Industry Canada European Union EMC Directive Conformance Statement Chapter 1 Product Introduction Covered Equipment Front Panel Transport LED Indicators Audio Encode Indicators System Indicators Controls Front Panel Menu Structure Services Menu RF Tx Menu IP Tx Menu Video Menu Audio Menu PIDs Menu VBI Menu Profile Menu CAS Menu System Menu Login Duration...

Страница 3: ...l How Tos How to Use Vertical Interval Time Code How to Configure Passthru Audio Auto Transport Mux Rate How to Use ASI Receive Chapter 4 Appendix Appendix A GNU General Public License Appendix B Technical Specifications Base Model EN91 Inputs Outputs Communications Video and Audio Physical and Operational Base Model EN 91P Inputs Outputs Communications Video and Audio Physical and Operational IF ...

Страница 4: ...ium or machine readable form without prior written consent from Adtec Digital Trademarks EN 91 is a trademark of Adtec Digital Dolby Dolby Digital AC 3 and the double D symbol are registered trademarks of Dolby Laboratories Other product and company names may be trademarks or registered trademarks of their respective companies The information in this document is subject to change without notice ...

Страница 5: ...s hours 9 00am to 5 00pm Central Standard Time CST Monday through Friday holidays excepted Support Requests can also be submitted on line All inquiries will be processed in the order in which they are received and by the criteria outlined in the Call Response Order Inquiries and inquiry responses made after 5 00 PM CST weekdays Saturday Sunday or on an Adtec recognized holiday will be processed th...

Страница 6: ... can expedite inquiry support responses through our subscription Standard Priority service plan Under this plan all telephone inquiries are guaranteed a telephone response of no more than 4 hours after they are received within the designated hours of operation Telephone inquiries received by 4 00 PM CST on weekdays excluding Adtec holidays are guaranteed a same day telephone response However inqui...

Страница 7: ...AM 5 00 PM U S Central Standard Time Excludes Weekends Holidays Call Response Time Same day 2 hours 1st in order of call list Same Day 4 Hours 2nd in order of call list 48 Hours Discounted Site Visits 25 10 None Discounted Training 25 10 None Repair Service Guaranteed 1 Day Turnaround 3 Day Turnaround None A one month free service extension will be awarded if Adtec fails to meet its service guaran...

Страница 8: ... rack so that the amount of airflow required for safe operation is not compromised The recommended clearance on the top and sides of the unit is at least one half inch one centimeter Mounting of the unit in a rack should be such that no hazardous condition is achieved due to uneven mechanical loading Use only a grounded electrical outlet when connecting the unit to a power source Reliable earth gr...

Страница 9: ... device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Cet appareillage numérique de la classe B répond à toutes les exigences de l interférence canadienne causant des règlements d équipement L opération est sujette aux deux conditions suivantes 1 ce dispositif peut ne pas causer l interférence no...

Страница 10: ...ditional Modulation options available See below IF is user definable between 50 180 MHz Power range of 30 5dBm EN 91P w L Band Modulator EN91P as configured above L Band Modulator Adds Newtec OEM L band Modulator Supports DVB S QPSK to 15 MegaSymbols Additional Modulation options available See below L band is user definable between 950 2150 MHz Power range of 35 5dBm EN 91P w L Band Modulator 10 M...

Страница 11: ...ulation options available See below IF is user definable between 50 180 MHz Power range of 30 5dBm EN 91 w L Band Modulator EN91 as configured above L Band Modulator Adds Newtec OEM L band Modulator Supports DVB S QPSK to 15 MegaSymbols Additional Modulation options available See below L band is user definable between 950 2150 MHz Power range of 35 5dBm EN 91 w L Band Modulator 10 MHz EN91 as conf...

Страница 12: ...ng standard definition On Encoding high definition Note This product offers optional HD encoding Check to make sure HD key is enabled if you experience issues with HD encoding IP Out Off Transport of IP via Ethernet or GigE is idle On Transport of IP via Ethernet or GigE is active RF Out Off Modulator is not transmitting On Modulator is transmitting Blink Modulator is running in test mode Note Mak...

Страница 13: ...TP alarm BISS Off No encryption set On Encryption active Link Off No network detected On Network communication active Busy Off No network activity On Network traffic present Controls Using the Mode Select Enter Escape and directional buttons the user can control the unit via the front panel Control Function Mode button Mode will cycle you through top layer menus Select Select will enter you into e...

Страница 14: ...t be illuminated If the display is dim press ANY front panel button to illuminate it Note If the unit has been previously configured by the operator and powered OFF and ON then the display will read the last valid configuration however Tx will read DISABLED To select the desired Carrier Mode press the front panel SELECT button To set Transmit to ENABLED or DISABLED press the front panel ENTER butt...

Страница 15: ... to TMR or Video rate will not restart the encoder Note With this mode enabled a transport stream analyzer will show a PCR accuracy error on TMR changes This is a type of false alarm if the error occurs during a bit rate transition the decoder adapts dynamically to the change This is an optional feature OFF ON Service Name Identifies the service by name This value is used to populate either the DV...

Страница 16: ...deo source When set to Encode only data will only be transmitted if there is a valid video source Data will not be transmitted if the encoder is idling CONTINUOUS ENCODEONLY Carrier ID Menu Carrier ID contains unique information within the transport stream to aid in identifying and troubleshooting satellite sources Specified by SUIRG and endorsed by the WBU ISOG the user will need to complete some...

Страница 17: ...list will differ from the list found in the web UI as it only shows those options available based on the feature keys found QPSK 1 2 QPSK 2 3 QPSK 3 4 QPSK 5 6 QPSK 6 7 QPSK 7 8 QPSK 1 4 QPSK 1 3 QPSK 2 5 QPSK 3 5 QPSK 4 5 QPSK 8 9 QPSK 9 10 8PSK 3 5 8PSK 2 3 8PSK 3 4 8PSK 5 6 8PSK 8 9 8PSK 9 10 16QAM 3 4 16QAM 7 8 16APSK 2 3 16APSK 3 4 16APSK 4 5 16APSK 5 6 16APSK 8 9 16APSK 9 10 32APSK 3 4 32APS...

Страница 18: ...200 bit FEC frame Therefore the Short FEC frame type should be selected in applications where latency is critical and the longer frame type should be used to optimize protection Short Normal Rolloff The Rolloff selection will determine the shape of the output filter The occupied bandwidth of the modulated signal is the symbol rate multiplied by 1 α where alpha α is the rolloff factor By using a lo...

Страница 19: ... select one of four unmodulated carriers The Pure Carrier option will provide an un modulated output carrier at the desired frequency and output power Other Carrier Mode options include Clock 4 8 16 Pure Carrier On Clock 8 Clock 4 Clock 16 10Mhz Clock Allows operator to generate or pass a 10Mhz signal The signal can be generated internally or sourced externally This is a special order option If yo...

Страница 20: ...Send On Off FEC Mode Forward Edge Correction selects on off When selected sends two FEC RTP streams in addition to a source RTP stream enabling a receiver to reconstruct missing packets in the source stream OFF ON MAXBURST BURST LOWLATENCY FEC L affects the maximum burstpacket loss that can be recovered 4 20 FEC D defines latency involved in burstrecovery 4 20 TOS Allows the operator to sets the T...

Страница 21: ... and CAVLC at rates 30Mbits sec CABAC CAVLC AUTO Chroma Allows the operator to set the encoder chroma type 420 422 Video Rate The rate at which video is being encoded Video bitrate changes are not dynamic They take effect at the start of the next encode session user defined using the numeric keypad If video autofill is enabled this value will change based on other variables Review Technical Specif...

Страница 22: ... in order to match various manufacturers latency settings The setting is rounded down and applied in video frame multiples a 50 mSec offset would result in the following one additional frame delay with 29 97 frame material and two additional frame delays with 59 94 frame material Max range is 400 to 200 and is constrained based on the ENCODELATENCY setting NORMAL and current video mode Fault Mode ...

Страница 23: ...sed An OPEN GOP uses referenced pictures from the previous GOP at the current GOP boundary A CLOSED GOP starts with an I Frame and subsequent B Frames do not rely on I or P frames from the previous GOP Open Closed GOP Structure GOP Structure sets the format Group of Pictures will use the order of interframes and the various types of picture frames that will be used I IP IBP IBBP GOP Size GOP Size ...

Страница 24: ...over an ethernet connection using broadcast packets ...

Страница 25: ...fashion EMBEDDED VIDEO ECC Words Default is ON Select OFF if the SDI source has problematic or non compliant ECC words OFF ON Level B The Level B configuration determines which SDI link to de embed audio when using 3G SDI Level B sources LINKA LINKB Settings for EN 91P only 1 8 Input Selects the audio input to use during encoding Analog SDI AES Mode Allow you to configure you device to Encode per ...

Страница 26: ...dB increments for AUDIO 1 and 2 only This trims the level on the analog audio path only to accomodate external audio gear variability Sync Audio Sync sets the audio sync offset This measurement is in milliseconds and works only on analog audios 800 Musicam Mode Allows the operator to choose how to encode left and right analog audio inputs STEREO MONO DUALMONO IFB This is a low latency audio path f...

Страница 27: ......

Страница 28: ...ning the video Packetized Elementary Stream data user defined using the numeric keypad Audio PID 1 8 Identify packets containing audio content for the specified channels user defined using the numeric keypad Teletext PID Teletext PID identify packets containing teletext information user defined using the numeric keypad VITC PID Sets the Program ID PID for the ANC H V ANC Data captured from HD SDI ...

Страница 29: ... allows loading SAVE The save submenu saves a profile with a user designated name DELETE The delete submenu deletes a profile from the available list CAS Menu Control Function Mode select between off BISS 1 and BISS E encryption options OFF BISS_1 BISS_E_USER_ID_ONE BISS_E_USER_ID_TWO Clear Session Word MODE BISS 1 uses a 12 digit hexadecimal Clear Session Word Encrypted Session Word MODE BISS E X...

Страница 30: ...ion feature This setting Allows the operator to specify a time frame in minutes until the unit will automatically log itself out Action Press mode until you see the System Menu Press Select Press the Down arrow Press Select Using the Up and Down arrows select the value you wish Press Enter to save your selection Possible Configurations 0 Zero The unit will not automatically log out 1 9 The duratio...

Страница 31: ...t is OFF Gateway IP Address The gateway is a routing mechanism that passes traffic between different subnets and networks user defined using the numeric keypad Default is 192 168 10 1 Stealth IP Address This is a security feature that allows only the designated Stealth IP Address to communicate with the unit for FTP and other services This control allows one point override access to the Stealth IP...

Страница 32: ......

Страница 33: ...ction Options Event Record Log of events outside of regular operating parameters scroll up and down to view log items SNMP Sub Menu Item Function Options SNMP Controls the status ON OFF of the Simple Network Management Protocol SNMP feature We support SNMPv2c version OFF ON CLEAR Read only community The Simple Network Management Protocol SNMP Read Only Password Default Value adtec user defined Rea...

Страница 34: ...nent ID This is one of the unique IDs for your unit This number along with your serial number are used to generate permanent feature keys read only value Temporary ID This is the other unique ID It along with the permanente ID and serial number are used to generate temporary feature keys read only value Key status Depending on what keys you have and if they are temp or permanent they will be liste...

Страница 35: ...ant AC Power Standard 3 pin computer power plug Auto range 70 240 VAC Input GigE MPEG2 or RTP multicast transport egress port SMPTE 2022 COM2 API Serial Communication Interface COM1 Serial Port Used for Troubleshooting Terminal Ethernet 10 100 base T ethernet interface Monitoring Management DVC Parport 9 pin parallel I O interface for control systems ...

Страница 36: ...S 3 per AES3 2003 Analog Audio In Stereo Pairs 1 and 2 600 Ohm Balanced Main RF output 50 Ohm BNC L Band Model Frequency range 950 MHz to 1 750 GHz Power Level 50 to 7 dBm IF Model Frequency range 50 MHz to 180 MHz Power Level 30 to 5 dBm Monitor RF output 50 Ohm BNC L Band Model Fixed power level at 45 dBm IF Model Fixed power level at 45 dBm fixed frequency at 1 08 GHz 10MHz Clock BNC 50 Ohm con...

Страница 37: ...ls for further configuration information The DVC Parport allows custom events to be programmed upon input pin voltage change It contains 4 available inputs for custom commands Please contact technical support for advanced usage in programming the parallel port GPIO Pinout PIN Designation Function 1 NC No Connect 2 D3 reserved for future functionality 3 D2 RECORD start encoder input 4 D1 STOP stop ...

Страница 38: ...Parport Pinout PIN Designation Function 1 NC No Connect 2 D3 Data bit 3 input 3 D2 Data bit 2 input 4 D1 Data bit 1 input 5 D0 Data bit 0 input 6 NC No Connect 7 5VDC 5V DC 8 GND ground 9 NC No Connect ...

Страница 39: ...gotiate the connection and a crossover may not be necessary To add the device to a LAN connect a standard CAT 5 Ethernet cable to your network router and then to the Ethernet port on the back of the device If your network is DHCP enabled and you prefer that over a static IP you can turn on DHCP for the device via the front panel System Network menu Zero Configuration Access Adtec Digital has adopt...

Страница 40: ...ditional information about how the parameter is used Upgrading Via Web User Interface Periodically we will provide firmware updates to our products via our website http www adtecdigital com To upgrade your device download the firmware file from our website and store it locally Login to the web based application and navigate to the Upgrade Firmware tab Click on the upload button located at the top ...

Страница 41: ...the front panel Using a terminal window complete the following Step Action 1 Type telnet x x x x in a terminal window without quotes where x x x x is the IP address of the unit 2 Press Enter 3 When prompted for a username enter adtec 4 When prompted for a password enter none Once you see User adtec connected the session is open and you may issue API commands to the unit To extract and select into ...

Страница 42: ...v1 03 09_RC nfcms tgz sysd version extract media hd0 media EN 80 v1 03 09_RC nfcms tgz OK Validating Firmware EN 80 v1 03 09_RC nfcms tgz Firmware file validated Extracting firmware EN 80 v1 03 09_RC nfcms tgz long series of extraction messages Extraction complete Moved usr adtec EN 80 to opt pkg Extraction successful sysd version OK adtec EN 80 1 03 10 current selection adtec EN 80 1 02 17 adtec ...

Страница 43: ...g var oem_prev for migrate opt pkg usr adtec EN 80 1 03 10 Current autoboot partition 2 Updating the primary kernel Creating a boot partition using the primary directory Flushing dev hde device buffer please wait ...

Страница 44: ...data as part of the ANC PID The ANC PID is a separate PES located in the transport stream Additionally time code within the GOP of the video will also be adjusted at encoder start up to match the incoming ancillary VITC VITC data packets will contain a DID of 0x60 and an SDID of 0x60 The VBI tab contains an SDI ancillary inspector that allows users to view ANC data present at the input This tab ca...

Страница 45: ...SDI or AES input passed into the egress transport stream IP RF ASI The encoder supports two passthru audios on the first four audio inputs The SDI Matrix and ASI Tranport Stream PID configurations allow for custom configurations if required Every audio input engine has an internal SDI Matrix to route any audio to one or multiple inputs Each audio engine output can be assigned a user configurable P...

Страница 46: ...ote If Dolby E or Dolby Digital is valid at the input the bit depth and bit rate are automatically determined after clicking Apply 4 On the PID tab type in the desired Audio PID for Audio 1 5 Adjust other audio PID s if necessary Common Passthru Problems Dolby E Line Placement and or Dolby E Continuity Count Errors Dolby E audio compression technology is designed so that 1 Dolby E audio frame corr...

Страница 47: ...detect the bit depth of Dolby E 16 20 bit and the bitrate of Dolby E Dolby Digital If Dolby E is selected and Dolby Digital is presented the encoder will change automatically and vice versa If Dolby Digital is selected and Dolby E is presented the encoder will change the configuration automatically If the front panel shows dashes for the detected bitrate Dolby is not being detected This is most co...

Страница 48: ...Rate The TMR is a key configuration for modulator functionality and must match the modulator interface rate Please note that the configured video and audio data rates must be lower than the targeted modulation data rate for this feature to work properly For example HD Video 3Mbps 8 pairs of Mpeg1 Layer2 384Kbps 3 072Mbps 6 2Mbps The TMR will not fit into a 3MBaud DVB S QPSK 3 4 modulation configur...

Страница 49: ...odulation capabilities The ASI input is routed directly to the ASI output module and to the internal modulator input All internal paths to and from the encoder module are terminated in this mode with encode functionality disabled The modulator will be acting as a stand alone device with 3 ASI outputs available for pre modulation monitoring capability In this mode the modulator interface rate must ...

Страница 50: ...ain that everyone understands that there is no warranty for this free software If the software is modified by someone else and passed on we want its recipients to know that what they have is not the original so that any problems introduced by others will not reflect on the original authors reputations Finally any free program is threatened constantly by software patents We wish to avoid the danger...

Страница 51: ...and 2 above provided that you also do one of the following a Accompany it with the complete corresponding machine readable source code which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange or b Accompany it with a written offer valid for at least three years to give any third party for a charge no more than your cost of physically...

Страница 52: ...icense incorporates the limitation as if written in the body of this License 9 The Free Software Foundation may publish revised and or new versions of the General Public License from time to time Such new versions will be similar in spirit to the present version but may differ in detail to address new problems or concerns Each version is given a distinguishing version number If the Program specifi...

Страница 53: ... program is interactive make it output a short notice like this when it starts in an interactive mode Gnomovision version 69 Copyright C year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY for details type show w This is free software and you are welcome to redistribute it under certain conditions type show c for details The hypothetical commands show w and show c should show the app...

Страница 54: ...put Standard SD NTSC or PAL D1 Composite Video Input Connector BNC 75 Ohm AES Audio Use Digital audio input x4 pairs or x8 channels for uncompressed LPCM or compressed bit stream processing Standard AES3 Connector Four BNC 75 Ohm SDI Embedded Audio Use Digital audio input x8 pairs or x16 channels for uncompressed LPCM or compressed bit stream processing Standard Digital audio embedded per SMPTE 27...

Страница 55: ...hin the IP supported limit of 200Mb s TCP does not support high throughput at this time The user has the ability to transmit IP streams via the GigE or 10 100 management port When transmitting streams via the 10 100 management port throughput is limited to the physical interface throughput Connector 8 pin RJ45 Communications COM2 Serial Port Use API Serial Communication Interface Default Baud Conf...

Страница 56: ...ed on feature key H 264 MPEG 4 HD ITU T H 264 ISO 14496 10 Format 1080i59 94 720p59 94 1080i50 720p50 420 Chroma High Profile Level 4 1 422 Chroma High Profile Level 4 1 Pre Processing Encoder Filters Spatial Median Data Rates 1 5 80Mb s Support for 422 based on feature key Group of Pictures GOP 1 30 I IP IBP IBBP Adaptive GOP Interlaced Encoding Field Frame MBAFF PAFF Motion Estimation and Precis...

Страница 57: ...72 V1 2 1 2003 01 AMOL V H ANC per SMPTE 291M Native via SD HD SDI Closed Captions per CEA 708 Carriage per ATSC A_72 Teletext Subtitles per OP47 Carriage per ETSI EN 300_472 V1 3 1 2003 01 VITC per SMPTE 12M 2 2008 Carriage per SMPTE 2038 2008 also insertd in GOP headers AFD Bar Data Pan Scan per CEA CEB16 2006 per SMPTE 2016 Carriage per ATSC A_72 Waveform Bridging and Conversion of Video User D...

Страница 58: ...onsumption depends on installed options Operational Ambient operating temperature 20 C to 50 C Ambient storage temperature 30 C to 80 C Non condensing relative humidity range 30 to 85 Safety CE Optional SFP module purchased separately Sensitivity 22dBm Overload 0dBm Exceeds SMPTE 297 2006 specifications Robust error free reception of signals from 50Mbps to 3Gbps Supports SD SDI HD SDI and 3G SDI H...

Страница 59: ...posite Video Input Connector BNC 75 Ohm AES Audio Use Digital audio input x4 pairs or x8 channels for uncompressed LPCM or compressed bit stream processing Standard AES3 Connector Four BNC 75 Ohm SDI Embedded Audio Use Digital audio input x8 pairs or x16 channels for uncompressed LPCM or compressed bit stream processing Standard Digital audio embedded per SMPTE 272M SD and SMPTE 299M HD Connector ...

Страница 60: ...r has the ability to transmit IP streams via the GigE or 10 100 management port When transmitting streams via the 10 100 management port throughput is limited to the physical interface throughput Connector 8 pin RJ45 Communications COM2 Serial Port Use API Serial Communication Interface Default Baud Configuration 38 400 bps 8 data bits 1 stop bit no parity Connector 8 pin RJ45 supplied with DB9 to...

Страница 61: ...6 10 Format 1080p59 94 1080p50 Level 4 2 Format 1080i59 94 720p59 94 1080i50 720p50 Level 4 1 420 Chroma High Profile Level 4 1 422 Chroma High Profile Level 4 1 Pre Processing Encoder Filters Spatial Median Data Rates 1 5 80Mb s Support for 422 based on feature key Supports 420 Only Group of Pictures GOP 1 30 I IP IBP IBBP Adaptive GOP Interlaced Encoding Field Frame MBAFF PAFF Motion Estimation ...

Страница 62: ... Carriage per ETSI EN 300_472 V1 2 1 2003 01 AMOL V H ANC per SMPTE 291M Native via SD HD SDI Closed Captions per CEA 708 Carriage per ATSC A_72 Teletext Subtitles per OP47 Carriage per ETSI EN 300_472 V1 3 1 2003 01 VITC per SMPTE 12M 2 2008 Carriage per SMPTE 2038 2008 also insertd in GOP headers AFD Bar Data Pan Scan per CEA CEB16 2006 per SMPTE 2016 Carriage per ATSC A_72 Waveform Bridging and...

Страница 63: ...onsumption actual consumption depends on installed options Operational Ambient operating temperature 20 C to 40 C Ambient storage temperature 30 C to 80 C Non condensing relative humidity range 30 to 85 Safety CE Optional SFP module purchased separately Sensitivity 22dBm Overload 0dBm Exceeds SMPTE 297 2006 specifications Robust error free reception of signals from 50Mbps to 3Gbps Supports SD SDI ...

Страница 64: ...y installed DVBS S2 hardware DVBS2 32APSK Software Option Satellite Modulation software key requires factory installed DVBS S2 hardware L Band Modulator option Requires factory installation Modulation Scheme Support QPSK 8PSK 16APSK 32APSK Interface Rate 50 kbit s 216 Mb s FEC interface dependent Baudrate range 0 06 45 68 Mbaud Selectable baseband shaping 20 25 35 DVB S2 compliant per EN 302307 DV...

Страница 65: ...ion Adds option to add 10MHz onto L Band output Connector Two BNC 50Ohm software keys are required to unlock full hardware support Base modulator supports DVB S QPSK 15 Mbaud MAIN BNC L Band Frequency 950 2150MHz MONITOR BNC Fixed Power Level 45dBm DVBS 30Mbps Software Option Satellite Modulation software key requires factory installed DVBS S2 hardware DVBS2 8PSK Software Option Satellite Modulati...

Страница 66: ...Signal 1 Channel 0 left 2 No Connection 3 Channel 0 Right 4 Channel 1 left 5 No Connection 6 Channel 1 right 7 Ground 8 No Connection 9 Channel 0 left 10 Channel 0 right 11 No Connection 12 Channel 1 left 13 Channel 1 right 14 No Connection 15 Ground ...

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