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Developing Cable Telephony Solutions

Developing Cable Telephony Solutions. Michael Metzger Executive Director, Marketing Mindspeed Technologies, Inc. Agenda. Introduction Voice over Cable Architectures Cable Standardization Bodies High Density Cable Gateway SoC Solutions EMTA SoC Solutions What’s Next in Voice over Cable?.

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Developing Cable Telephony Solutions

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  1. Developing Cable Telephony Solutions Michael MetzgerExecutive Director, MarketingMindspeed Technologies, Inc.

  2. Agenda • Introduction • Voice over Cable Architectures • Cable Standardization Bodies • High Density Cable Gateway SoC Solutions • EMTA SoC Solutions • What’s Next in Voice over Cable?

  3. Introduction • VoIP over Cable is experiencing strong growth within North America • Forecast of more than 17 M Voice over Cable subscribers in 2008 • VoIP over Cable completes MSOs offering for triple-play voice, video, and data services • Fundamental change in architectures moving to Packet-based networks from analog Voice over Cable

  4. PSTN Voice over Cable – Current Architecture • Analog voice traffic placed on cable medium, and connected to PSTN using traditional Class-5 switch Headend Class 5 Switch Cable Modem Network Interface Terminal IP Network

  5. PSTN Next Generation – VoIP over Cable CMTS Data/Voice Traffic IP Network Call Mgmt Server • True VoIP over Cable, packetized in converged MTA solutions • Migration to all IP networks Voice Traffic SBC EMTA IP Network Media GW, Signaling GW WiFi

  6. PacketCable • Specification forum focused around detailing the architecture for next-generation IP Cable networks • For Voice, PacketCable details: • QoS • Security • PSTN & IP Interconnect • Lawful Intercept • Reliability

  7. IPCablecom Standardization Process Global Standards (J.160 – J.174) ITU-T Regional Standards SCTE ETSI TCC (Japan) Contributors CableLabs (projects) ECCA (requirements) Vendor Vendor Vendor

  8. PacketCable – Timeline • Rel 1.0 • Architectural framework for Packet-based Cable networks (1999) • Rel. 1.5 • Added new voice codecs, fax relay (2005) • Future Releases • IMS architecture & mobility • Call control moving to SIP • New voice and video codecs

  9. PacketCable – QoS • Quality of Service in PacketCable networks must at a minimum be equal to that of the PSTN • Fundamental requirement to drive adoption • Major Factors affecting QoS for voice: • Voice Compression Technology • Packet Loss • Packet Latency/Delay • Echo Cancellation • To ensure high QoS, SoCs must address the above

  10. Typical High-Density Gateway Solution Control and Signaling Media Stream Processing Ethernet Ethernet Voice Channels DSP Resource Manager Control Applications TDM Signaling Stacks N x DSP Host Operating System Internal Memory Media Stream Processing sub-system offloads host CPU

  11. SoC SoC SoC SoC PSTN IP Ethernet Switch SoC SoC SoC SoC TSI SoC SoC SoC SoC OC-3 Ethernet PHY SoC SoC SoC SoC SoC Solutions for High Density Gateways VoIP to TDM (with/without encryption) Media Forking for CALEA (with/without encryption) Transcoding (IP-IP) (with/without encryption)

  12. SoC T S I Packet Processor Voice DSP Voice DSP TDM Ethernet Voice DSP Voice DSP Security Memory SoC Architectures for High Density Gateways

  13. DSP Functions: Codecs • Limited uplink speed demands complex voice codecs • Echo Cancellation G.168-2002/4 • Required G.711, recommended G.729e, G.728 (Rel. 1.0) • Added required iLBC, BV-16 (Rel. 1.5) • Future release • Wide-Band Codecs • Wireless Codecs

  14. Encode with RDA module 8.5kb/s bit - rate VAD Encode with Input 4.0kb/s bit - rate Output bit speech M Additional stream parameters U Encode with extraction X 2.0kb/s bit - rate Mode requirement Logic of rate Encode with determination 0.8kb/s bit - rate Example of Wireline/Wireless Codec: SMV • Selectable Mode Voice Codec (SMV): Standardized for CDMA2000 • G.711 Equivalent Voice Quality • Music Detection • Efficient Rate Determination Algorithm: Average Bitrate ~ 4kbit/s • 4 coding rates: (full-rate:8.5kb/s, half-rate: 4.0kb/s, quarter-rate: 2.0kb/s, eight-rate: 0.8kb/s)

  15. DSP Functions: Intelligent Transcoding • Increasing demand for Voice transcoding with migration to an all IP network • Dynamic prediction algorithms prevent the degradation of voice quality inherent in typical G.711 transcoding schemes • Roundtrip delay critical for voice quality over an IP network is significantly minimized • No echo cancellation required

  16. Fax & Modems Transport Required Packet & DSP functions: • Transmit V.90 and 14.4 kbit/s FAX (over G.711) • T.38 Fax Relay • 40 ms frame sizes • Packet redundancy • Synchronization of end-points: less than 0.25 frame slips per minute

  17. Security Processing • PSTN security is based around the assumption that there is a direct dedicated link between the user and the central office • In PacketCable networks, shared medium is used • As such, cryptographic methods are used to provide security in PacketCable for call privacy • Optional implementation • 128-bit AES encryption • MMH/SHA-1 for message authentication

  18. Packet Cable Voice Payload Encryption IP UDP RTP Voice payload Authentication Encrypted Portion (AES) Authenticated Portion (MMH)

  19. SoC SoC SoC SoC SoC SoC Active 2 voice Standby Active1 Active 3 SoC SoC SoC SoC SoC SoC ADM6326 ADM6326 ADM6326 Ethernet Switch SoC SoC SoC Miro SoC Miro SoC SoC SoC SoC SoC Miro SoC SoC Miro SoC SoC SoC SoC Miro SoC Miro SoC SoC 74mm 74mm 74mm SoC Miro SoC SoC Miro SoC Miro SoC Miro SoC SoC SoC Miro SoC Miro SoC Miro SoC SoC Miro SoC Miro SoC SoC Miro SoC Miro SoC Miro SoC SoC SoC SoC SoC SoC SoC FPGA Flow Classifier FPGA Flow Classifier FPGA Flow Classifier SoC SoC SoC SoC SoC SoC SoC Miro SoC Miro SoC SoC Miro SoC SoC Miro SoC Miro SoC SoC Miro SoC SoC Miro SoC Miro SoC Miro SoC Miro SoC SoC Miro SoC SoC Miro SoC Miro SoC Miro SoC SoC SoC Miro SoC Miro SoC Miro SoC Miro SoC SoC Miro SoC Miro SoC SoC Miro SoC SoC Miro SoC Miro SoC Miro SoC IDT 72V71660 IDT 72V71660 IDT 72V71660 5 x 9s Reliability with N:1 Redundancy

  20. Low to Medium Density MTA’s Embedded MTA SoC SHM T S I Control & Signaling Processor CSP MSP Voice & Data Routing 1 to N Telephones Telephony Interfaces CablePHY Voice DSP core EXPANSION BUS PCI Wi-Fi Printer or Peripheral USB 2.0 MMU Security Dual EMAC Ethernet Memory

  21. CSP & MSP Model • Deterministic Voice Quality & Data Routing/VPN Performance • MSP/CSP partitioning for real-time & non real-time processes • Corner case interoperability & standards compliance • CODECs & common functions run on MSP • New/3rd Party Applications does not affect MSP Processing • CSP hosts applications independent of media stream • E.g Linux or VxWorks Single UnifiedMemory Non Real-time CSP Control & Signaling Processor DDRSDRAM Virtual EthernetDriver Real-time MSP Media Stream Processor Cable Modem Ethernet TDM

  22. Open Source Applications for a CSP Core Telephony Networking Development Tools

  23. What’s Next in Voice over Cable? • Mobility • Support cellular handset/WLAN • Wireless/Wireline Transcoding in Cable GW • Call control mechanisms • TGCP  SIP • Migration to IP V6 • Integration of Session Border Controllers functions into Cable GW • Adoption of IMS Architecture • Instant messaging (IM)

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