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Deploying Digital Drivers , Architectures, and Considerations Mike Hochman 2008 CCTA Annual Meeting San Juan, PR. Outline. System architectures and drivers Simulcast Edge Expansion All-Digital Encoding architectures Constant bitrate (CBR) Variable bitrate (VBR) Ad insertion

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slide1

Deploying DigitalDrivers,Architectures,and ConsiderationsMike Hochman2008 CCTA Annual MeetingSan Juan, PR

outline
Outline
  • System architectures and drivers
    • Simulcast
    • Edge Expansion
    • All-Digital
  • Encoding architectures
    • Constant bitrate (CBR)
    • Variable bitrate (VBR)
    • Ad insertion
    • Locally generated channels
  • Considerations for choosing the correct architecture and partner
typical analog cable system
Typical analog cable system

450 – 550 MHz

60-80 channels

Analog “scrambling” & traps

No HD, VOD, etc.

Analog

receivers

Analog

modulators

Node

Fiber/HFC

Coaxial

Combiner

IRD

Receiver

Decoder

digital simulcast
Digital Simulcast
  • Increase digital services
  • Enhance user experience
  • Maintain high quality
    • Discerning viewers
    • Large screen TVs
digital simulcast1

Multiplexing &

Modulation

Encoders

Digital Simulcast

Piracy protection on digital channels

Digital video quality

Lower cost all-digital set top

Foundation for HD, VOD

~ $3,000 per channel

Analog

receivers

Analog

modulators

Node

Fiber/HFC

Coaxial

Combiner

IRD

Receiver

Decoder

edge expansion

Multiplexing &

Modulation

Encoders

Analog

modulators

Edge QAM

Combiner

Decoders

Edge Expansion

Expanded plant bandwidth

Interactive applications

VOD

Switched Digital Video

~ $500 / channel / node

Analog

receivers

Node

Fiber/HFC

Coaxial

IRD

Receiver

Decoder

all digital

Multiplexing &

Modulation

Encoders

Decoders

All-Digital

All-digital network

Complete piracy protection

“Unlimited” bandwidth

$50 - $300 per set top box

Analog

receivers

Node

Fiber/HFC

Coaxial

Edge QAM

IRD

Receiver

Decoder

architectures
Architectures

$

Simulcast

Analog & digital throughout the network

~ $3,000 per channel

Edge Expansion

Decoding and modulation at the edge

Additional ~$500 - $1000 per channel per node

All-digital

Complete piracy protection

Bandwidth for future growth

$$

$$$

Flexible platforms

enable seamless migration

constant bit rate
Constant Bit Rate
  • Fixed transport bitrate
  • Fixed video bitrate
  • Fixed audio bitrate
  • Video quality varies dependent on content
  • Constant across program mix
slide11

All-CBR Architecture

Modulation

Encoding

variable bit rate
Variable Bit Rate
  • Target bit rate range (min, max)
  • Target video quality
  • Bit rate changes to achieve target
  • Varies with time
  • Varies across program mix
variable bit rate1
Variable Bit Rate

“Easy” content:

  • News channels
  • Cartoons

“Difficult” content:

  • Sports action
  • Quick scene changes
slide14

Open-loop VBR

Encoding

Rate-Shaping

Modulation

slide15

Closed-loopVBR

Closed-loop

controller

Bit rate assignments

Complexity estimates

Modulation

Encoding

slide16

IP

IP

Distributed Closed-loop

Region 2

Closed-loop controller

Region 1

Modulation

Encoding

cbr vbr open closed rate shaped

Closed-loop VBR

$$$$$$

16 ch. per QAM

Open-loop VBR

Rate-shaped

$$$

Rate-

shaper

14 ch. per QAM

Open-loop CBR

Rate-shaped

$$

Rate-

shaper

12 ch. per QAM

Open-loop CBR

Not rate-shaped

$

10-11 ch. per QAM

CBR, VBR, Open, Closed, Rate-shaped
ad insertion
Ad Insertion
  • Maintain existing analog ad insertion system and encode after insertion
    • Low Cost
    • Harder to manage
    • Reduced video quality
  • Digital Program Insertion
    • Ads stay digital
    • Are usually CBR
    • Easier to manage
    • Higher video quality
slide19

Ad Splicing

SCTE 35

Encoder

Mux/Splicer

QAM

Ad stream

Network

Cue tones

DTMF, Contact Closure, or SCTE 104

SCTE 30

CATV Network

Ad Server

locally generated content
Locally Generated Content
  • If you wish to deploy all-digital set-tops, EVERYTHING must be digital
    • MDU in-house channels
    • Hotels
    • Hospitals
    • Stadiums
locally generated content1

Community Cameras

Encoding, Multiplexing, Modulation and Up Conversion

Locally Generated Content

Analog receivers

Analog Fiber Node

Ad Servers

Without digital set top

Edge Decoding

Groomer/Mux

Optical IP transport

Off-air

ENCORE Encoders

Splicer/Mux

Modulation

QUARTET Encoders

With digital set top

Digital Fiber Node

Digital receivers

Community Cameras

MDU encoding, multiplexing, modulation and up conversion

criteria for partner selection
Criteria for partner selection
  • Video quality
  • Channels per QAM
  • Ease of deployment and maintenance
  • Cost
  • Digital ad-insertion
  • Upgradeability, flexibility
  • Work with partners that have experience, and proven success interoperating with each other
ad