By the DOCSIS Team August 2002 DOCSIS™ Overview By the DOCSIS Team August 2002

Operator Aggregation network Operator Core Backbone Cable Architecture New Services Opportunities PacketCable DOCSIS CableHome HVAC control Fire sense & control Security Air quality monitoring Child monitoring Energy management, etc. CM CM CMTS MPEG Services CM CM CM Operator Aggregation network Operator Core Backbone CMTS CM CM Remote file sharing Shared calendar Unified messaging Managed services CM CM IP Services CMTS CM CM Core Network Aggregation Network Access Network Operator administered Backend Headend CPE © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

DOCSIS Evolution & Road Map DOCSIS 1.0 (Global Standard) 15 million products shipped worldwide as of YE2001 Modem price has declined from $300 in 1998 to $50 in 2002 214 CM Certified, 28 CMTS Qualified DOCSIS 1.1 (Tiered services, VoIP) Interoperable and backwards-compatible with DOCSIS 1.0 “Quality of Service” and dynamic services, a MUST for PacketCable Increased Security: authentication and secure software downloading Account Management for usage and event-based billing CCCM – lowest cost yet (less than $50) 32 CM Certified, 16 CMTS Qualified DOCSIS 2.0 (Symmetric Services) Greater (x6) upstream capacity of DOCSIS 1.0 Greater (x3) upstream capacity of DOCSIS 1.1 Greater Bandwidth efficiency b/s/Hz Improved robustness against interference © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

New Revenue Opportunity for Operators DOCSIS 1.1 Overview Interoperable with DOCSIS 1.0, plus more… Access to bandwidth at high data rates or lower latency adds more value Enhanced “Quality of Service” (QoS) Guarantees and/or limits for data rates Guarantees for latency Improved security - designed to reduce possibility of “theft of service, provide secure software downloading.” Interoperability - DOCSIS 1.0 and DOCSIS 1.1 cable modems and CMTSs on the same plant. Better operation and OSS features Transmit Equalization - more robust transmission New Revenue Opportunity for Operators © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

DOCSIS 2.0 Overview (100% backward compatible with DOCSIS 1.0/1.1) Symmetrical services are enabled by DOCSIS 2.0 1.5x greater efficiency operates at 64 QAM 2x wider channels new 6.4 MHz wide channel DOCSIS 2.0 widens the pipe for IP traffic, allowing cable providers to create more and better services for voice, video, and data It does this by using enhanced modulation and improved error correction Superior ingress and impulse noise performance 3 Times better upstream performance than DOCSIS 1.1 6 Times better upstream performance than DOCSIS 1.0 © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

DOCSIS™ Road Map DOCSIS Key Features Benefits/ Services DOCSIS 1.0 (5 Mbps u/s) Spec’d for retail Standard spec High speed data Internet access DOCSIS 1.1 (10 Mbps u/s) QoS Pre-EQ Operations Security Tiered service Double u/s capacity Lower op’s costs Better than competitor DOCSIS 2.0 (30 Mbps u/s) Mandatory S-CDMA/ TDMA Best of DOCSIS Symmetric services Peer-to-peer Business-to-business (20 T1 capacity) © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

IP Evolution over Cable Data DOCSIS 1.0 Data, Voice (Intelligent Pipe) 1.0 1.1 Voice Data Voice, data, video Broadband Services & Applications Advanced Broadband DOCSIS CableHome PacketCable New Stuff © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential

Broadband Platform OCAP/ Services PacketCable™ DOCSIS™ CableHome™ Home Home Devices Home Net Backbone HFC Services and Content (anything, anywhere) Home devices Security (encryption, authentication) Management End-to-end QoS Services © Cable Television Laboratories, Inc. 2002. All Rights Reserved. Proprietary/Confidential