broadcast’s ethernet demandsbroadcast’s ethernet demands todd roth vp technology servers,...

Broadcast’s Ethernet DemandsTodd RothVP TechnologyServers, Graphics and EditingH i C ti B d t C i tiHarris Corporation, Broadcast Communications

Feb 16, 2012

1http://www.broadcast.harris.com/NEXIO

Broadcast Racks


Broadcast Media Connection Types

Baseband Link – Single Discreet Signal / Stream

•Usually Coax •Uncompressed

VID

EO

•Unidirectional•Up to 3Gbps

•HD SDI Video•AES Audio

Fiber Link – Multiplexed Signals / Streams

V

•Fiber Optic•Bidirectional•Up to 10Gbps

•Compressed or Uncompressed•Video, Audio•Fiber Channel / Sonet

d i k l i l dCompressed Link – Multiplexed Transport Streams

•Usually Coax•Unidirectional•Up to 270Mbps

•Compressed•ASI ,MPTS, PSTS •DVB, ATSC

IP Link – Packetized Streams and Files

•Ethernet•IP Routed

•Various signals over IP•Streams, Files


•Up to 10Gbps •Command and control

Overview of Target Applications

Re-Distribution

Direct-To-Home

Contribution

(Fixed and Mobile)

Distribution

Studio-To-Studio


Broadcast Connection Types

Other Synchronous• Reference or Sync• LTC – Linear Timecode

Synchronous Media• Video• Audio

VIDEO• Intercom

Isochronous

Audio

• Command and Control via protocol• RS422, RS485• X-Y Switcher protocol

Asynchronous• File transfer / Ethernet• Device interfaces – GPIO, keyboards, mice, etc

SAN• Fiber Channel• Infiniband


Infiniband• Firewire

Transition to IP

Other Synchronous• Reference or Sync• LTC – Linear Timecode

Synchronous Media• Video• Audio H

ARD

• Intercom

Isochronous

Audio H

Isochronous• Command and Control via protocol• RS422, RS485• X-Y Switcher protocol

Asynchronous• File transfer / Ethernet• Device interfaces – GPIO, keyboards, mice, etcE

ASY

, y , ,

SAN• Fiber Channel• Infiniband

E


• Infiniband• Firewire

Transition from Coax to IP


Technical Challenges IP Migration

• Encapsulating The Video Datap g• Protecting The Data• To Compress Or Not To Compress• Getting Video Across The Network

Managing QoSDealing With Packet LossDealing With Packet Loss

• Dealing with Complexity • Interoperability Compatibility and Legacy• Interoperability, Compatibility and Legacy Infrastructure


Network Impairments - QoS

• Packet Loss• Burst Loss• Burst Loss• Packet Out of Order• Delay Variation – Jitter/Wander• Delay Variation Jitter/Wander• Signals impact other signals• Performance varies over time


Encapsulating The Video Data

Society of Notion Picture and Television Engineers (SMPTE)d f l d / d22

• ‐1 Forward Error Correction for Real‐Time Video/Audio Transport on IP• ‐2 Unidirectional Transport of Constant bit rate MPEG‐2 Transport Streams on IP• ‐3 Unidirectional Transport of Variable bit rate MPEG‐2 Transport Streams on IP• ‐4 Unidirectional Transport of Non‐Piecewise Constant Variable Bit Rate MPEG‐2 Streams on IP

MPT

E 20

2


• ‐5 Forward Error Correction for High Bit Rate Media Transport on IP• ‐6 High Bit Rate Media Transport on IPSM

Protecting The Data

At the Source Encryption and watermarking the media essence

At the Transport (TS) Basic Interoperable Scrambling SystemDVB Simulcrypt


At the Network IPSec

Getting Video Across The Network

• Managing Bandwidth and QoS• Non‐deterministic Latency / Variable Performance• Failure recovery

OC‐3 155 Mbps

OC‐12 622 Mbps

OC‐48 2.5 Gbps


p

OC‐192 10 Gbps

QoS - Dealing With Packet Loss

Sources of Packet LossC ti i th

Dealing with Packet Loss• Congestion in the

network• Random Noise

Loss• Detecting packet corruptionD t ti k t l• Cuts to links

• Equipment failure

• Detecting packet loss• Regenerating lost information

• FEC, Retransmit or Do Nothing


QoS - Dealing With Packet Loss

ACTION ADVANTAGE / USES TRADE‐OFFS

FEC

Lossy NetworkMulticastNo return Channel

Adds Overhead and LatencyRecoverabilityFEC No return Channel

Deterministic Overhead / Latency

RecoverabilityDesign Complexity / Cost

Retransmit Higher Error Recovery

Requires Return ChannelPoint – to – point connectionsHigh / Variable Latency / OverheadN “St d d” f h dliNo “Standard” for handling

Do Nothing

Sort of like what happens in baseband Sort of like what happens in


Do NothingLow error rateLow tolerance for latency

baseband

To Compress Or Not To Compress

Bandwidth (Mbps) Compress Technique 1 500 3 000 Uncompressed 1080i 1080p1,500 3,000 Uncompressed 1080i , 1080p200‐960 Digital Cinema 4x2K AVC‐High40 ‐ 200 JPEG 2000, ACV‐High 4:2:2 10 bit

b


50 ‐ 100 MPEG‐2 4:2:2 8 bit25‐40 H264 4:2:2 10 bit (Blue Ray)

Complexity

• Ease of Installation• Ease of Installation• Ease of Operation• Ease of Maintenance and Troubleshooting• Ease of Maintenance and Troubleshooting• Interoperability and Compatibility Among Devices• Integration to Legacy Infrastructure (bridging)g g y ( g g)


Summary

• IP networks are becoming a cost‐effective way to transport real time professional broadcast signals

• Technical Challenges– Encapsulating The Video Data

Protecting The Data– Protecting The Data

– Getting Video Across The Network

– To Compress Or Not To Compress

• New Skills and Workflows

• Complexity, Ease of Use and Interoperability


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