Voice Over IP Peter Cochrane
Voice Over IP
Peter Cochrane
Changes will be mega-destructive…•BlueTooth
•Ultra Wideband
•WiFi + WiMax
•MP3
•Voice Over Internet Protocol (VOIP)
•Radio Frequency Identification (RFID)
•Blogs & Video Blogs
…are only the start
We can only guess/imagine whatour networks will be expected to support in the next decade/s…and it is the customers who decide and not the companies
Peter Cochrane1995
Network Laws - Broadcast
1
2
3
4
n
Connectivity = < n/2One way onlyNot all are always on
Network Laws - Telephone
1
2
3
4
n
< n/2
Broadcast1
3 4
5
2
< n(n-1)/2 ~n2
Bothways - Customer Control
Availability >99%
Network Laws - Internet
1
2
3
4
n
< n/2
Broadcast Telephone
< n(n-1)/2 ~n2
1
3 4
5
2
1
2
N
3
4
5
1 2 …nNn
Always - customer control
Availability >95%
How many friends do you have… ...how many people do you know?
Separation People You Know
0 => 30 => 3001 => 900 => 90,0002 => 27,000 => 27,000,0003 => 810,000 => 8,100,000,0004 => 24,300,0005 => 729,000,0006 => 21,870,000,000
The Telephone Network
Dedicated point to pointconnections based on oldanalogue technologiesspanning >100 years
Reliable, dependable, welldeveloped, well understood,but limited and in decline
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
From fixed line to…. …..Mobile
From talk to…. .Text
Millions
1996 1997 1998 1999 2000 2001 2002 2004 2005
1,400
1,200
1,000
800
600
400
200
0
WEB Mobile Phones
Cellular MobileCustomers
PC's onLine
Fixed Line Phones
VOIP MobileDevices
A dying circuit switchednetwork
A growing IPnetwork
PSTN v Packet Switched (IP - VOIP) Space
1Bn
2003 2005
Local Region National International Switches Gateway
X X X
X
X
X
X
X
X
X
Analogue Analogue Digital
Telephone Basics
IP - Packet Switched Networks
S
R
S
Server
Router/Switch
RR
RR
R
RR
Packets ofbits in serialtransmission
Packets arrive in wrong order & haveto be reassembled correctly
Voice Over Packet Switched Networks(VOIP)
S
R
S
Server
Router/Switch-Telephone-Mobile-Headset
RR
RR
R
RR
Telco VOIP
SRS
Server Router
-Telephone-Mobile-Headset
R X
Nailed DownRouters & Switches
Circuit to Packet …. Cost Reduced to 10%
Death to the PBX?
X WiFi/BlueTooth
Mobile/PDA
PBX
VOIPGateway
PSTNCircuit
SwitchedNetwork
InternetIntranet
A world of opportunity & risk….
Thank you,
cochrane.org.ukconceptlabs.net