PTP: Backbone of the SMPTE ST2110 Deployment

Transcription

1 C U R A T E D B Y PTP: Backbone of the SMPTE ST2110 Deployment Sarkis Abrahamian, VP of Business Development Embrionix IP SHOWCASE THEATRE AT IBC SEPT , Status on SMPTE ST Wide vs Narrow (ST ) 3.PTP system design and remaining issues Curated by the Services Forum vsf.tv 1

2 Encap Encap IP device (Sender) ST ST2110 High level overview ST ST ST ST ST Traffic Shaping Uncompressed video Uncompressed video PCM Audio AES3 Transparent Transport Ancillary Data Seamless Protection Switching of IP ST Datagrams System Timing ST PTP profile IP device (Sender) ST ST2110 High level overview ST ST ST ST ST Traffic Shaping Uncompressed video Uncompressed video PCM Audio AES3 Transparent Transport Ancillary Data Seamless Protection Switching of IP ST Datagrams System Timing ST PTP profile Curated by the Services Forum vsf.tv 2

3 ST ST now becomes ST ST Formatting the ST to follow ST2110 ST Format Agnostic 8K SDR HDR ST One Encapsulation Standard Curated by the Services Forum vsf.tv 3

4 ST-2110 Compression Draft state: Integration of Compressed signals VC2 ST State: FCD Ballot Opened Compressed video ST PCM audio -30 is defined to provide a lot of flexibility; Audio shuffling and breakaways in the network 1x PCM per flow, or 16 PCM per flow, or anything in between Redundancy with ST Curated by the Services Forum vsf.tv 4

5 ST PCM audio + multiple audio profiles; 1 msec Packet time 125 sec Packet Time Level 48 KHz 96 KHz 48 KHz 96 KHz A 1 to 8 ch AX 1 to 8 ch 1 to 4 ch B 1 to 8 ch 1 to 8 ch BX 1 to 8 ch 1 to 4 ch 1 to 8 ch 1 to 8 ch C 1 to 8 ch 1 to 64 ch CX 1 to 8 ch 1 to 4 ch 1 to 64 ch 1 to 32 ch ST PCM audio But wait! Let s be pragmatic 1x Flow per channel Is this not a configuration 16 channels per Source nightmare? + Can the system really scale? X2 for ST = Do you really need that much 32 flows per Source flexibility? Curated by the Services Forum vsf.tv 5

6 ST PCM audio More Reasonable Implementation; Reduce the number of flows to a reasonable quantity Group channels that should not be shuffled Use specialized audio channel matrix where needed 1.Status on SMPTE ST Wide vs Narrow (ST ) 3.PTP system design and remaining issues Curated by the Services Forum vsf.tv 6

7 Wide versus Narrow NARROW Sender Steady packet pacing (Isochronous) WIDE Sender Bursty packet pacing time Impact on the Receiver NARROW Sender Steady packet pacing (Isochronous) NARROW NARROW Receiver Process WIDE Sender WIDE Receiver Bursty packet pacing WIDE Process time Min Packets - recommended Embrionix: = 1 UHD frame Curated by the Services Forum vsf.tv 7

8 Gapped versus Linear encapsulation Incoming SDI / HDMI signal VBlank IP flow Incoming SDI / HDMI signal + buffer Computer generated video VBlank IP flow H H VBlank GAP VBlank H H Gapped Sender Linear Sender ST (profiles) v=0 TP=2110TPN --> NARROW o= IN IP TP=2110TPNL --> NARROW LINEAR s=st TP=2110TPW --> WIDE t=0 0 m=video RTP/AVP 96 c=in IP /64 a=source-filter: incl IN IP a=rtpmap:96 raw/90000 a=fmtp:96 sampling=ycbcr-4:2:2; width=1920; height=1080; exactframerate=30000/1001; depth=10; TCS=SDR; colorimetry=bt709; PM=2110GPM; SSN=ST :2017; TP=2110TPN; interlace=1 a=mediaclk:direct=0 a=ts-refclk:ptp=ieee : ff-fe bb:0 Curated by the Services Forum vsf.tv 8

9 Receiver can adapt to the Sender type SDP file NARROW Sender ADAPTIVE Receiver Control WIDE Sender NET NARRW Short delay (7 s) Process Receiver can adapt to the Sender type NARROW Sender ADAPTIVE Receiver Control WIDE Sender NET WIDE Process Longer delay (in ms) Curated by the Services Forum vsf.tv 9

10 Dealing with Packet Impairments Packet impairments can be introduced by the various physical layers inside your network! TCP: = Packets are retransmitted UDP: = Packets are lost / dropped Possible Packet Impairments Jitter / Accumulation / Busting Packets Device Network Receiver Out of Order Packets Device Network Receiver Curated by the Services Forum vsf.tv 10

11 Packet Duplication Possible Packet impairments Device Network Receiver Packet Drop Device Network Receiver Packet Corruption Possible packet impairments Device Network Receiver Curated by the Services Forum vsf.tv 11

12 Takeaways Recommended to design Narrow senders; especially when used for production / real time application Wide senders is a reality and the Receivers must take this into account Receiver must be capable to recover from eventual packet impairments from your network 1.Status on SMPTE ST Wide vs Narrow (ST ) 3.PTP system design and remaining issues Curated by the Services Forum vsf.tv 12

13 SDI System How do we genlock signals in IP? Used as a reference for Composite and SDI signals Horizontal and Vertical alignments Color phasing Black burst Signal Switching accuracy 25 Same role as Black Burst How do we genlock signals in IP? IP System Servo-master Slave Hierarchy type alignment process Master PTP Clock Slaved Device PTP Timing 26 Curated by the Services Forum vsf.tv 13

14 ANC Audio Switching from one source to another When is PTP required? Rebuilding a ST2110 (/Audio/ANC) Media Network Destination device 27 Typical IP Media facility GENLOCK DARSTime Code Ref SDI equipment 28 Curated by the Services Forum vsf.tv 14

15 Typical IP Media facility Dual PTP Master Clocks PTP time PTP time IEEE-1588 PTP / Distribution PTP Messages (UDP) Redundant IP Network IP Media End Point IP Media End Point Slaved VIDEO SPG PTP Time PTP Time PTP Time GENLOCK GENLOCK GENLOCK Ref Time Code Ref Audio Ref Time Code DARSTime Code Ref SDI equipment (Drawing Inspired by Michel Proulx) 29 A closer look! 1- PTP master sends the sync time to the slave 2- Slave device sends a delay request to the master 3- Slave receives a delay response from the master 8x / sec AES-R16 profile The locking time should take 5sec Master PTP Clock Slaved Device Curated by the Services Forum vsf.tv 15

16 PTP within a Spine / Leaf Architecture Core switch Leaf switch S Ordinary clock Edge device PTP Master M S Boundary clock M S Ordinary clock Edge device Leaf switch establishes PTP reference with PTP Master Clock Transparent clock Transparent clock simply modifies the PTP messages to compensate for its own propagation delay Edge device establishes PTP reference with Leaf switch S Leaf switch Boundary clock M S S S Ordinary clock Ordinary clock Ordinary clock Edge device Edge device Edge device Between Master and Slave Curated by the Services Forum vsf.tv 16

17 Best Selection of Grand Master Device PTP Master A PTP Master B Timing exchange Timing exchange BMCA Algorithm Internal Clock GENLOCK Audio ANC 1- Identifier Selection of most accurate 2- Quality - expected deviation Grand Master based on a 3- Priority published - by pre-configuration algorithm 4- Variance - stability performance Packet Time Stamping for Realignment Sender A Audio Sender B Sender C Audio Network Delay A Network Delay B , Audio and ANC packets are aligned using Timestamps Index Network Delay C Buffer Receiver Audio Buffer IP Processing Audio A/V Output Not Aligned aligned time Curated by the Services Forum vsf.tv 17

18 Takeaways PTP is a necessity in any IP ST2110 deployment Black burst must be in phase with PTP PTP aware IP switches! Boundary clock is necessary in a Spine/Leaf architecture Redundancy; support of (BMCA) Best Selection of Grand Master Edge device packet buffering space to handle network latency and Wide sender profile C U R A T E D B Y Thank You Sarkis Abrahamian, Embrionix sarkis@embrionix.com IP SHOWCASE THEATRE AT IBC SEPT , 2018 Curated by the Services Forum vsf.tv 18