The SMPTE ST 2110 and NMOS standards are now maturing and in serious use globally. In an all-IP production environment, there are key requirements for the manipulation of audio within a facility. Further to this, there are challenges of how essence-flow synchronization is automatically maintained. When sharing audio between facilities for remote/meshed/distributed production there are further challenges for integrity, timing, and control. The presentation will look at all of these facility and wide-area challenges and use recent deployments as case studies to demonstrate how they have been overcome.

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File Type: pdf
Categories: Audio
Presenters : Andrew Rayner - Nevion
Year : 2019
dlp_document_download : Audio in 2110 facility and across WANAndy Rayner, Chief Technologist, Nevionarayner@nevion.com+44 7711 196609 My family is expanding: granddaughter & >me ❤Time is important!ST2110 uses a PTP Epoch time of 1stJanuary 1970PTP: 38 billion frames* = 74286 billion audio samples Andy: 41 billion frames* since his epoch! (52 years) = 78728 billion audio samples **Esther:790 million frames* since her epoch! (12 months) = 1514 billion audio samples***25fps**48kHz Audio –the most important bit!‘Most of the complexity of a production environment is the audio’The Audio folks did IP first! Standardized Audio interfacesStandardisedIP formatsProprietaryIP formatsLots of different audio interfaces and formats!AnalogueAES3SDI embeddedIP 2022-6embeddedIP -3326IP -AES67AES10 MADILivewireDANTERAVENNAEBU 3326AES67ST2110-30AES50AoEWheatNetQ-LAN SMPTE ST 2110 suite –so far!SYSTEM -10AUDIO -30VIDEO -20COMPRESSEDVIDEO -22AES3-32 bitAUDIO -31TIMING -212022-8COMPOSITEANCILLARYDATA -40MULTI-PA R T VIDEO -23FA S T M E TA DATA -41FMX -42SD VIDEO -24 Standardized data plane mature, control plane recently provenAudio data streamAudio data streamControllerIS-04, IS-05, IS-07, IS-08 •Keep it all-IP –don’t go back to baseband!•Gain and delay control still needed•Asynchronous (external) sources timing reconciliation (SRC)•Flexible ST2110-30 channel density (1 –64 channels)•Full (per mono channel) shuffling capability•Fully Orchestration configurable•NMOS compliant•All-IP processingAudio manipulation requirements Audio requirements drive scale in facilities and beyond8AUDIO -30 9Video-associated audio format interfacingST 2022-616 MonoST 2022-616 MonoST 2022-616 MonoST 2022-616 MonoST2110-308 MonoST2110-308 MonoST2110-308 MonoST2110-308 MonoSDI16 MonoSDI16 MonoSDI16 MonoSDI16 MonoST 2022-616 MonoST 2022-616 MonoST 2022-616 MonoST 2022-616 MonoST2110-308 MonoST2110-308 MonoST2110-308 MonoST2110-308 MonoSDI16 MonoSDI16 MonoSDI16 MonoSDI16 Mono 10Audio-onlyformat interfacing2110-3116 Mono2110-3116 Mono2110-3116 Mono2110-3116 Mono2100-308 Mono2110-308 Mono2110-308 Mono2110-308 MonoAsyncin16 MonoAsyncin16 MonoAsyncin16 MonoAsyncin16 MonoAES316 stereoAnalogue16 MonoAES316 stereoAnalogue16 MonoAES6764 MonoAES6764 MonoAES6764 MonoAES6764 MonoMADI64 MonoMADI64 MonoMADI64 MonoMADI64 Mono 11Audio facility interconnectsRemote commentary locafonEventlocationProducfon CenterRe-syncRe-sync 12Moving outside campus based audio production islands•WAN co nnecti vi ty i nvo l ved•Longer latencies•(Potentially) Asynchronous sources •Layer 2 too limiting•Layer 3 (routed) needed for larger and multi-campus networks12PTP GMPTP GM From link-based IP systems to end-to-end IP systems Absolute time of origination is captured in AES67/ST2110-30Media payloadRTPUDPIPVLANMAC/PoS/GFP/MPLS…but quickly lost as it is treated as a transport timestamp Reconciling essence timings for useProcessing timeProcessing timeProcessing timeOriginafon fmeUse timelink fmelink timelink timelink timelink time Why are we in the current approach?•ST2110 doesn’t (yet) actually specify using fming for end2end L-but it is coming!Digital media processing unitIPrxIPtx Device internal architecture tracking moments of time through a systemInternal real-time timing distributionMedia ingress timestampMedia egress timestamp Processing funcfons AES67–defines link offsetlink fme PTP holdover is capable of being very long –let’s make it so! Going off-campus –the IP facility media edgePTP TIMINGDEVICEDISCOVERY & CTLMEDIA FLOW IP ADDRESSINGESSENCEFLOWSPROTECTIONTERMINATIONALTERNATIVE TIMING DOMAINSRESTRICTED/PROXYDISCOVERY & CTLDIFFERENT IP ADDRESSING (NAT)ESSENCE ORCOMPOSITE FLOWSPROTECTIONTERMINATION Protection –on and off campus –video & audionn+1n+2n+4n+5n+6n+8n+9n+10n+3n+7n+11n+12n+13n+14n+16n+17n+18n+20n+21n+22n+15n+19n+23n+24n+25n+26n+27n+28n+29n+30n+31n+32n+33n+34n+35n+36n+37n+38n+39n+40n+41n+42n+43(1,1)(L,1)(1,2)(1,D)(L,D)(2,1)(2,2)1L2flow Aflow BSOURCEDESTINATIONflow Aflow BDESTINATIONSOURCEdelaySpatialSpafal + temporalFEC ST2110→WAN"To enable effective transport of ST2110 media flows and associated control data across Wide Area Networks in an interoperable manner."22 ST2100-WAN AG -two layers of focus –data and controlMedia essencesdata flowsRegistration, discovery and control ST2110 over WANfor inter-facility & OBs•Flow protecfon ✓•Flow trunking ✓•Essence alignment ✓•Low latency handling•Format conversion•Compression ✓•Protection of other data flows ✓•Security•PTP trunking•Wan timing •Associated control (NMOS) filtering and border proxyingNext topic TRUNKTr u n k i n g2110 essences252110-202110-302110-402110-30OTHER STUFF Recent use case -Audio signal flowsVideoIPath Conclusions •Audio is incredibly important•Audio is always the most complex part of the system•Full standards compliance is essenfal•The standardized control layer is less mature –but all parts are now there•Standards now provide capability for L3 wide-area data & control planes •Keeping the audio signal flow All-IP is crucial to gain full benefit•Flexibly audio manipulafon in the IP domain is crucial27 Thank YouIf you are in the UK, do comeand join me for a nice cup of tea!Andy Rayner, Chief Technologistarayner@nevion.com+44 7711 196609
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