Peter Cochrane

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Voice Over IP

• Peter Cochrane

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• 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

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We can only guess/imagine whatour networks will
be expected to support in the next decade/sand
it is the customers who decide and not the
companies
Peter Cochrane 1995
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Network Laws - Broadcast
Connectivity lt n/2 One way only Not all are
always on
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Network Laws - Telephone
Broadcast
lt n(n-1)/2 n2 Bothways - Customer
Control Availability gt99
lt n/2
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Network Laws - Internet
Broadcast Telephone
Nn Always - customer control Availability gt95
lt n/2
lt n(n-1)/2 n2
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How many friends do you have ...how many
people do you know?
Separation People You Know
0 gt 30 gt 300 1 gt 900 gt 90,000 2 gt 27,000
gt 27,000,000 3 gt 810,000 gt 8,100,000,000 4 gt
24,300,000 5 gt 729,000,000 6 gt 21,870,000,000
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The Telephone Network
Dedicated point to point connections based on
old analogue technologies spanning gt100
years Reliable, dependable, well developed, well
understood, but limited and in decline
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From fixed line to. ..Mobile
From talk to. .Text
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PSTN v Packet Switched (IP - VOIP) Space
Millions
Cellular Mobile Customers
1,400 1,200 1,000 800 600 400 200 0
Fixed Line Phones
1Bn
WEB Mobile Phones
A dying circuit switched network
A growing IP network
PC's on Line
VOIP Mobile Devices
1996
1997
1998
1999
2000
2001
2002
2004
2005
2003 2005
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Analogue
Analogue Digital
Telephone Basics
Local Region National International
Switches Gateway
X
X
X
X
X
X
X
X
X
X
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IP - Packet Switched Networks
Router/Switch
R
R
Server
S
S
R
R
R
Packets of bits in serial transmission
R
Packets arrive in wrong order have to be
reassembled correctly
R
R
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Voice Over Packet Switched Networks(VOIP)
-Telephone -Mobile -Headset
Router/Switch
R
R
Server
S
S
R
R
R
R
R
R
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Telco VOIP
-Telephone -Mobile -Headset
Server
Router
S
R
S
R
X
Nailed Down Routers Switches
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Circuit to Packet . Cost Reduced to 10
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Death to the PBX?
VOIPGateway
PBX
X
PSTN Circuit Switched Network
Internet Intranet
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A world of opportunity risk.
Thank you, cochrane.org.uk conceptlabs.net