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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
Developing Cable Telephony Solutions

Michael MetzgerExecutive Director, MarketingMindspeed Technologies, Inc.

agenda
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?
introduction
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
voice over cable current architecture

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

next generation voip over cable

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

packetcable
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
ipcablecom standardization process
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

packetcable timeline
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
packetcable qos
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
typical high density gateway solution
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

soc solutions for high density gateways

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)

soc architectures for high density gateways

SoC

T

S

I

Packet Processor

Voice

DSP

Voice

DSP

TDM

Ethernet

Voice

DSP

Voice

DSP

Security

Memory

SoC Architectures for High Density Gateways
dsp functions codecs
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
example of wireline wireless codec smv

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)
dsp functions intelligent transcoding
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
fax modems transport
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
security processing
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
packet cable voice payload encryption
Packet Cable Voice Payload Encryption

IP

UDP

RTP

Voice payload

Authentication

Encrypted Portion (AES)

Authenticated Portion

(MMH)

5 x 9s reliability with n 1 redundancy

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
low to medium density mta s
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

csp msp model
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

open source applications for a csp
Open Source Applications for a CSP

Core

Telephony

Networking

Development Tools

what s next in voice over cable
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)