The art of conforming to the SMPTE traffic model: part I. EBU Media over IP Architect Willem Vermost

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1 The art of conforming to the SMPTE traffic model: part I EBU Media over IP Architect Willem Vermost vermost@ebu.ch

2 part I: How to protect the network?

3 Well behaved traffic on a single lane

4 Bursty traffic

5 β AVERAGE SPEED Bandwidth average 55 β Packet Delay Variation Ideal Packet Spacing (IPS) t Ideal Traffic Shape on microscopic scale t β Bursts Actual Sender on microscopic scale Late packet SPEED LIMIT 80 t

6 J MULTIPLE LANES

7 REDUED # LANES AHEAD

8 Spine SPEED LIMIT 40 Sa Sb OSPF & EMP Leaf La Lb Lc Ld Le Host SPEED LIMIT 10! "#$%& '&() ==! '&() h,"- Non-blocking for unicast traffic

9 SPEED A LIMIT B 10 D E F G H I J K L A A A A A A A A B B B B B B B B D D D D D D D D E E E E E E E E F F F F F F F F G G G G G G G G H H H H H H H H I I I I I I I I J J J J J J J J K K K K K K K K L L L L L L L L!"! # $ La L K J 12 packets arrive at linerate of 10 Gbps at the switch. Those packets willl be serialised and put on the output port at 40 Gbps. I H G F Buffer Packets arrive at line rate 12 x 10 Gbps pushed to 1 x 40 Gbps link E %$ H G F E D B A SPEED LIMIT 40 Sa

10 A B A A A A A A A A B B B B B B B B Buffer will be used to store the bytes that don t fit the output due to speed limitations. D D D D D D D D D E E E E E E E E E F F F F F F F F F G H I G G G G G G G G H H H H H H H H I I I I I I I I La B A L L L %$ K J I H G F E D B A Sa J K J J J J J J J J K K K K K K K K L K J I H G F E D B L A L L L L L L L L L L!"! # $ Buffer

11 A B A A A A A A A B B B B B B B A B Buffer will be used to store the bytes that don t fit the output due to speed limitations. D D D D D D D D D E E E E E E E E E F F F F F F F F F G H I G G G G G G G H H H H H H H H I I I I I I I G I La B A L L L %$ K J I H G F E D B A Sa J K L J J J J J J J K K K K K K K K!"! # $ L L L L L L L L J A L K J B D I E H G F E F G H I Buffer D J K B L A L STOP Packet will be dropped!

12 Packet Delay Variation results in: Increased Latency Dropped Packets

13 Thou shalt not drop any packet Nor at the sender, nor in the network, nor at the receiver side

14 In order not to drop any packet, SMPTE ST dictates boundaries to packet jitter for IP traffic

15 Leaky bucket to be measured at sender side. Packets are thrown in this virtual leaky bucket The bucket is drained at a certain drain rate Results in well behaved IP traffic There shall not be more packets in the leaky bucket as defined by MAX MAX INST ST Sender Drain Rate = 1/T DRAIN (packets / second)

16 Egress total 3.2 Tbps max 4 Btotal 16 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 90% 80% 70% 60% 50% 40% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

17 Egress total 3.2 Tbps max 16 Btotal 16 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 90% 80% 70% 60% 50% 40% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

18 Egress total 3.2 Tbps max 16 Btotal 16 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 90% 80% 70% 60% 50% 40% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

19 Egress total 3.2 Tbps max 16 Btotal 64 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 90% 80% 70% 60% 50% 40% 30% 20% 10% 1.942E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

20 How to measure INST? Need an accurate timestamp in each Ethernet frame Need to Reconstruct the drain rate alculate the instantaneous watermark

21 Use Accurate Timestamp Drain rate = 1 / (( Tframe / Npackets ) / Beta )

22 def frame_len(capture): # To calculate Npackets, you need to count the amount of packets between two rtp.marker == 1 flags. # This is as easy as looking to 2 rtp.marker == 1 packets and substract the rtp.sequence number. # The exception that will occurs is that the packet sequence number rotates. Modulo is your friend! first_frame = None for pkt in capture: if pkt.rtp.marker == '1': if not first_frame: first_frame = int(pkt.rtp.seq) else: return (int(pkt.rtp.seq) - first_frame) % onstants.pkt_sequene_bit_depth return None def frame_rate(capture): # To calculate the framerate of a given capture, you need to look at three consequent rtp time stamps [(t2-t1) + # (t3-t2)] / 2 will result in the average timestamp difference. Note: the frame periods (difference between 90 # khz timestamps) might not appear constant For example 60/1.001 Hz frame periods effectively alternate between # increments of 1501 and 1502 ticks of the 90 khz clock. rtp_timestamp = [] for pkt in capture: if pkt.rtp.marker == '1': if len(rtp_timestamp) < 3: rtp_timestamp.append(int(pkt.rtp.timestamp)) else: frame_rate_c = Decimal(onstants.RTP_LOK / (( (rtp_timestamp[2] - rtp_timestamp[1]) % onstants.rtp_timestamp_bit_depth + (rtp_timestamp[1] - rtp_timestamp[0]) % onstants.rtp_timestamp_bit_depth) / 2)) return frame_rate_c return None

23 EBU Live IP Software Toolkit

24 peak = 1 Egress total 3.2 Tbps max 1 Btotal 16 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 70% 60% 50% 40% 90% 80% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

25 peak = 73 Out of -21 spec Egress total 3.2 Tbps max 70 Btotal 16 MB Ractive 96% Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 1/Beta 70% 60% 50% 40% 90% 80% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

26 Egress total 3.2 Tbps max 6000 Nice Lab Rat Btotal 16 MB 96% Ractive Beta 1.1 Usage of Egress (1/Beta) and 100% of memory 70% 60% 50% 40% 1/Beta 90% 80% 30% 20% 10% 4.855E E E E E E E E E Resolution Hz Npackets Packetrate Resolution Hz β βgap #Streams

27 App App FPGA Software Virtual OS Kernel NI SWITH OS Kernel NI

28 JT-NM Roadmap of Networked Media Open Interoperability* NAB14 IB14 NAB15 IB15 NAB16 IB16 NAB17 IB17 NAB18 IB18 NAB19 IB19 NAB20 IB20 LEGEND: Standard / Specification Published Widely available Study / Activity EBU R146 IV. Dematerialized facilities** loud Security for Media ompanies AMWA ontent Model and APIs Agile Media Machine ore JT-NM Security Recommendations Top-Ten Security Tests EBU R148 Recommended minimum Security Tests III. Network & Resource Management loud-fit Open, secure, public/private (on-premises) cloud solutions Non-media-specific IT Self-describing, open APIs suitable for virtualization AMWA IS-04 AMWA Event & Tally AMWA Timing and Identity AMWA IS-06 Network ontrol AMWA IS-05 onnection management Discovery & Registration Including mapping to ST 2110 System-level management and automated provisioning for flexible and sharable infrastructure at scale I. SDI over IP 0. SDI VSF TR-03 SMPTE ST 2059 AES67 SMPTE ST II. Elementary flows SMPTE ST 2110-nn Transport of compressed video SMPTE ST 2110 Transport of separate essences Timing profile SMPTE ST Bridging SDI over IP with Elementary flows More flexible and efficient workflows New formats like UHD and mezzanine compression urrent and mature technology Number not yet assigned. **See Dematerialized Facilities FAQ at JT-NM.org for more information. * JT-NM assumption as of March 2018 and will evolve over time. Visit JT-NM.org for the latest update. Feedback to jt-nm-info@videoservicesforum.org

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