Trouble in IP Heaven

Telco Talk IP Destination QOS Class of service Latency “Shaped” service

Carriers Infrastructure

Datapac

PSTN Frame Relay

IP

ATM

MegaRoute

ISDN

Carrier’s Future

Fibre

SONET

MPLS/IP

Voic

e

Vid

eo

VPN

s

Man

ag

ed

IP

Inte

rnet

Ap

p.

Serv

ices

SONETGE

Class of Service - Examples

Class 1 - VoIP - Low latency Class 2 - VPN - Moderate

Latency Class 3 - Best effort - DSL

VoIP and VOIP Voice over IP

Low data rate Can Miss info Low latency

Video over IP High data rate Needs 10 –10 BER Latency depends

on application

Qos

Output Buffer

Input BufferDropped

CRC Errors Failed Checksum

Traditional transport Errored info is transferred

IP transport Bad data… Tossed out

ITU Y.1541

Bit Error Rate

Bit Loss Rate

Jumbo Frames 1500 bits no more Not WAN material Can Be over 65,000 bits

MTU

UDP vs. TCP TCP

Confirmed data Wait until ACKed

UDP No “Stop lights” Broadcast Mode Inherent Higher Priority

Video Data

Mb/s

Time

“Shaped” Service

Meter

Marker Shaper

Input

Dropped

Qos

Priority

1

2

3

Video Stream

12364758

UDP

File Transfers

Tools etc…

Ethereal.exe

TCPOptimizer.exe

Thanks