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Desktop Television. Entertainment Video over the Campus Data Network Tim Ward, NUIT Telecommunications and Network Services. Outline . What has been deployed? Why deploy desktop TV? Northwestern campus infrastructure Deployment across the campus Future directions and next steps.

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desktop television

Desktop Television

Entertainment Video over the Campus Data Network

Tim Ward, NUIT

Telecommunications and Network Services

outline
Outline
  • What has been deployed?
  • Why deploy desktop TV?
  • Northwestern campus infrastructure
  • Deployment across the campus
  • Future directions and next steps
what has been deployed
NUTV Service

23 channels of entertainment television

Combination of off-air and CATV channels

IP Multicast to all undergraduate dormitories (4350 unique locations)

MPEG2 encoding, 29.97 FPS, ~2Mbps per stream (128Kbps mono audio)

Internet 2 Multicast Service

2 channels CSPAN and CSPAN2

IP Multicast to all of Internet 2

MPEG2 encoding

CSPAN - 2 Mbps

CSPAN2 - 4 Mbps

What Has Been Deployed?
  • No client software installed on machine
  • Channel guide services – what’s on now and later?
why deploy this type of system
Why Deploy This Type of System?
  • No CATV in student dormitory rooms
    • Only in common areas/lounges
  • Over 60 residence halls
    • Cost to wire with coax very high ($2-5Million)
    • Estimated time of completion: ~4 years
  • CATV major issue for the student population
system features
System Features
  • Live encoding of television
  • Additional pre-encoded video
  • Small footprint viewer software
  • Viewer downloaded as part of stream
  • Viewer available for multiple operating systems
  • http://www.videofurnace.com
  • Program guide for content labeling
initial testing phase
Initial Testing Phase
  • Deployed 4 off-air channels
  • Deliver to well-supported residence halls
  • Get feedback on content and distribution from the students
  • Tested for six weeks, followed by student vote on service
  • One significant problem discovered in testing phase
full deployment
Full Deployment
  • Ramp up from 100 students to 4000 students in 3 weeks
  • RA’s, Rescons, and new students first
  • Clients for all Windows Platforms and Mac OS 9 initially
  • Mac OS X and Intel Linux Clients now available
operational experiences
Operational Experiences
  • Test phase problem
    • RP for multicast tree not distributed correctly
  • Two deployment problems
    • IGMP snooping and CGMP fast leave
      • Switch table flush occurs prior to router flush, causing a flood condition on all switch ports
    • IP multicast TTL Threshold
      • Command causes all multicast packets to be route processed
what s watched

1000 Viewers

What’s Watched?

3rd Week

On ABC

On Sunday

what else is watched
What Else is Watched?

War with

Iraq

(CNN)

Joe

Millionaire

(FOX)

how much is watched
How Much is Watched?

2700 simultaneous

Viewers - different

channels

700 viewers

in first week

keeping it secure
Keeping it Secure
  • Access Control
    • Unicast – network allowed to get client?
    • Multicast – is the stream available on the network?
  • Client to Server - License Transaction
    • Can I get a client?
    • Encrypted transaction
  • Encrypted Streams
    • Can I watch this stream?
    • Key exchange for stream being watched
    • 128-bit key with a 64-bit block cipher
future directions
Future Directions
  • Subscriber services (conditional access)
  • Client-controlled closed captioning
  • Set top boxes
  • Additional subscriber base
    • Greek houses
    • Graduate housing
  • Other content sources
    • NU content; Law School, School of Communication
questions
Questions?
  • http://www.northwestern.edu/nutv/
    • Campus Multicast of 23 channels
  • http://www.i2-multicast.northwestern.edu/
    • Internet 2 Multicast of CSPAN and CSPAN2
  • [email protected]
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