Network and Technology

John Schanz Executive Vice President National Engineering and Technology Operations Comcast Cable

Analyst and Investor Meeting 1 May 1, 2007 Agenda

• Network overview • What we’ve built • Our improving economics: scale and open standards • How the network evolves

Analyst and Investor Meeting 2 May 1, 2007 Network Highlights

• Our converged infrastructure is efficient and has significant capacity • Unmatched optimization flexibility • Incremental capacity can be added as needed • Scale, IP technologies, and open-standards are driving improved economics • Switched Digital Video, improved compression technology, open platforms, and DOCSIS 3.0 are tools we will use going forward

Analyst and Investor Meeting 3 May 1, 2007 Network Overview Scale • Plant route miles 563k • Fiber route miles 126k Comcast territory • Optical nodes 102k • Homes passed 47.7MM • CDV-ready homes 34.8MM Technology • Average node size 468HP • First 40Gbps integrated optics • 10G/40Gbps regional networks Network Delivers • Soft wavelength routing • 190MM+ ON DEMAND views/month • IPv4 and IPv6 operational • 1.1Bn+ Web pages daily • QoS based voice, video & data • 1.5+ PetaBytes of IP-sourced video each day • Self healing architecture • 57MM+ emails daily

Comcast delivers over 418 Terabytes of entertainment and information into an average household every month, that’s equivalent to 20 Libraries of Congress and more than 900,000 times more than YouTube…

Analyst and Investor Meeting 4 May 1, 2007 Comcast Digital Cable • Converged IP network • 88% of historical Comcast footprint all-digital-simulcast capable by YE07 • 256 QAM modulation for all digital services • More than 190 million Video ON DEMAND views each Month • Expanding VOD Content (9,000+ programs per month; over 150 hours of HD VOD)

Last Mile Head End Secondary Hub HFC Network

Comcast National Backbone

Broadcasters Secondary Hub Hosted Applications Fiber Nodes

Secondary Fiber Node Hub Internet Switching & Routing

Secondary Hub On-Demand

Secondary Hub Hosted Content PSTN SS7 5 Comcast High-Speed Internet •Speed increases (8/1, 16/2, and PowerBoost) - PowerBoost up to 16 Mbps or 22 Mbps • Enabled by 256 QAM downstream and 16 QAM upstream • Coming soon - Channel bonding (100+ Mbps capable) • More aggressive focus on Commercial high-speed Internet

Last Mile HeadHead EndEnd Secondary Secondary Hub HFC Network

Comcast National Backbone

Broadcasters Secondary Hub Hosted Applications

Secondary Fiber Node Hub Internet Switching & Routing

Secondary Hub On-Demand

Secondary Hub Hosted Content PSTN SS7 6 Comcast Digital Voice • CDV available in ~75% of HSD HP • Leveraging existing IP and plant infrastructure and provisioning system • Deploying soft switches – Over 70 in production by YE07 • Coming soon – SIP Trunking – Scaling Voice with IP-based interconnect capabilities • Coming soon – Least-cost call routing capability

Last Mile HeadHead EndEnd Secondary Hub HFC Network

Comcast National Backbone

Broadcasters Secondary Hub Hosted Applications

Secondary Fiber Node Hub Internet Switching & Routing

Secondary Hub On-Demand

Secondary Hub Hosted Content PSTN SS7 7 Optimizing Network Capacity to Expand Product Offering

VOD 10,000+ Programs Dynamic VOD VOD Stream Routing 9,000+ Programs HSD: 100+ Mbps CDV: Higher Groom DOCSIS 3.0 Penetration Digital 1.8G CHSI/CDV Services Allocated 40 Mbps 2G to Digital ≥ Services 3:1 HD HDTV: 100+ HDTV Compression 25+ Networks

318 Digital More Digital Channels Switched More HD Digital Video 78 Analog Channels 50-76 Analog Channels Today 2007 - 2009

Analyst and Investor Meeting 8 May 1, 2007 2007: A High Growth Year

Foundational: Replacements, Refresh

Growth-Driven: CDV, IPv6, SDV, etc.

Cost-Avoidance: SIP Handoffs, Backbone

Cost-Cutting: CDP Wind down, Analog

Analyst and Investor Meeting 9 May 1, 2007 Our Converged Network • National Backbone: – 2006: Complete – Today: 33% of HSD traffic – 2007-2009: • More On-net Internet traffic and interconnects • On-net call routing (reduces PSTN circuit costs) • Video distribution and transport • Converged Regional Area Networks (CRANs): – 90% of HP are CRAN connected – Provides connectivity for regional hubs and service convergence – Today: Delivers High Capacity Video, Voice, and Data – Coming Leverage: Support Business Services • Converged Access via HFC: – 95%+ is 750Mhz or greater – Provides 4.5Gbps into each home – Carries video (Linear, ON DEMAND), voice, and data (DOCSIS) – < 50% of capacity is allocated to digital services today – < 2% of capacity is allocated to IP traffic today

Analyst and Investor Meeting 10 May 1, 2007 Advantages of Scale

• Fewer network elements to purchase Capital Efficiency • Better bandwidth efficiency and low bandwidth services travel for almost “free” • Better vendor economies of scale

Lower • Fewer network elements and types to manage Operating • Lower maintenance fees from equipment suppliers Costs • Lower traffic exchange costs to third parties

• New services require new applications, not new networks Faster Time to Market • More innovative “ecosystem” – more players and a broader development community • Easier to deliver cross-platform services • Consumer and Business dollars are moving to IP technologies and services

Analyst and Investor Meeting 11 May 1, 2007 More Open Video Standards Faster Innovation and Improved Economics

Aspen: OCAP Core Monitor OSL Applications Applications Applications (CE, Programmer, etc.) (GuideWorks, Client Our OCAP TiVo, etc) (TVWorks) OCAP Services Library software platform (TVWorks) OCAP Stack and Extensions Native Interface

Interface RNG: Platform Support Software (Residential Network Gateway) (RNG SW, CP and Prov/OSS Specifications) OS and Drivers Our open hardware (Supplier Specific) set-top box Hardware (RNG HWCP Specifications) And More: NGOD: Our Next-Gen ON DEMAND Platform and Switched Digital Video

Analyst and Investor Meeting 12 May 1, 2007 Residential Network Gateway - RNG

Open Platform is Backward-Compatible with current Set-Top Devices 9 Increased Power 9 Improved Economics 9 Multiple Vendors

100 200 1000 Mass Market HD –DVR Converged CPE

2008 2007 2009

MPEG - 2 MPEG - 4 MPEG - 4 Standard-Def HDTV HDTV Television

Analyst and Investor Meeting 13 May 1, 2007 One Converged Network

• Capacity to deliver products today and into the future • Economics are scaling well • Multiple levers to optimize network capacity even further • Open standards will drive innovation and reduce total cost of ownership

Analyst and Investor Meeting 14 May 1, 2007 Network and Technology

Tony Werner Executive Vice President and Chief Technology Officer Comcast Cable

Analyst and Investor Meeting 15 May 1, 2007 Agenda

• Network Overview • What We’ve Built • Our Improving Economics (Scale & Open Standards) • How the Network Evolves

Analyst and Investor Meeting 16 May 1, 2007 Network Evolution Multiple Tools Provide Unmatched Capacity and Flexibility

1. Optical Scaling/Node Splits 2. Digital Optimization 3. Switched Digital Video 4. Channel Bonding (DOCSIS 3.0)

Analyst and Investor Meeting 17 May 1, 2007 #1 Optical Scaling/Node Splits • Market success of new services drives node splits

– Node splits efficiently provide capacity where and when it is required – Today, node splits are driven by downstream requirements for HSD and ON DEMAND

Analyst and Investor Meeting 18 May 1, 2007 Optical Scaling/Node Splits Capacity Where and When Needed

Broadband market penetration is unevenly distributed across geography

10% FN With our HFC A 30% Market Architecture, we penetration = only add capacity 20% FN where needed

30% FN

60% FN

Analyst and Investor Meeting 19 May 1, 2007 ModernModern HFCHFC NetworkNetwork

Three types of node splits: Logical Modular Physical

FN Primary Primary Ring Hub FN

FN FN

20 Optical Scaling/Node Splits 2007 Node Split Mix

Mix Cost Cost/HHP

Logical 65% $2,500 $3.35 Drives a weighted average cost Modular 25% $6,000 $8.00 of $6.85 per household affected Physical 10% $20,000 $26.65

Capacity Where and When Needed

Analyst and Investor Meeting 21 May 1, 2007 #2 Digital Optimization

• Several techniques emerging – Dual Pass Encoding – ICE Higher Quality • Interchangeable Video with a 50% Compressed Elements Increase in – PAC Capacity • Personalized Adaptive Coding – VBR Stat-Muxing for VoD

Analyst and Investor Meeting 22 May 1, 2007 Digital Optimization ON DEMAND Capacity

50% More Capacity with Today VOD Improved Quantization and Carried as Constant Bit Rate Variable Bit Rate Statistical Multiplexing

10/QAM 15/QAM

Analyst and Investor Meeting 23 May 1, 2007 #3 Switched Digital Video

Broadcast Video OPTICAL NODE Many Unwatched HEADEND Channels

Transport Ring

OPTICAL DISTRIBUTION NODE HUB Only Requested Channels

Switched Video

Analyst and Investor Meeting 24 May 1, 2007 Switched Digital Video Viewership by Service

Viewing Minutes by Channel 120 1. Of the lowest viewed 200 100 channels, 40 are the maximum watched at any 80 given time.

60 2. Provided that viewing patterns remain the same, an infinite 40 number of channels can be added without additional 20 bandwidth. Relative Viewing Minutes - 0% 10% 20% 30% 40% 50% 60% 70% 80% 90%

Channel Ranking (Highest to Lowest)

Analyst and Investor Meeting 25 May 1, 2007 #4 Channel Bonding for Broadband DOCSIS 3.0 is the next generation of the DOCSIS standard

Logical Channel Bonding Technology ~160 Mbps 38 Mbps 38 Mbps 38 Mbps 38 Mbps

6 MHz 6 MHz 6 MHz 6 MHz

• Increased speeds 100Mbps+ • Significant reduction in cost per bit • Trial in 2007 and deploy in certain markets in 2008

Analyst and Investor Meeting 26 May 1, 2007 Channel Bonding DOCSIS 3.0 Economics

CMTS Cost Per Subscriber*

$25 6 Mbps 6 Mbps 100 Mbps Tier Tier Tier • Estimate 70% Lower

$20 CMTS Cost per Sub with DOCSIS 3.0* $15 • 100 Mbps Tiers at Similar

$10 CMTS Economics to Today’s 6 Mbps Tier $5 • Deployable Where Needed

$0 DOCSIS 2.0 DOCSIS 3.0 DOCSIS 3.0

Analyst and Investor Meeting 27 *Based on early range of equipment estimates. May 1, 2007 Bandwidth to Deliver Products Today and Tomorrow Conservative Assumption Forecast of Near-Term Bandwidth Requirements (07-09) 160

140

750 MHz 120 System HSD/VOD HD 100 Dig 78 MHz of Tier Spare Capacity 80 Growth Capacity

# of RF Channels 60

40 Analog

0 Today's Line-Up More HD DOCSIS 3.0 Switched Analog to Improved Reclaim from FINAL RESULT Channels + More Digital Savings Digital Compression Legacy Apps HDVOD Migration Analyst and Investor Meeting 28 May 1, 2007 Bandwidth to Deliver Products Today and Tomorrow Moderate Assumption Forecast of Near-Term Bandwidth Requirements (07-09) 160

140

750 MHz 120 System HSD/VOD HD 100 Dig Tier 80 240 MHz of Growth Capacity Spare Capacity

# of RF Channels 60

40 Analog

• Powerful Network • Unmatched Flexibility • Significant Capacity

Analyst and Investor Meeting 30 May 1, 2007