Transcript Save the World!

Save the World!
What’s appropriate for global networking?
Where do we go from
here?
• Networking costs money
• Market payback has driven network
infrastructure
• Without networking, what do you
do? Can you take part in the global
market?
• Is networking a right?
• Who pays?
Pieces of the net
• Connections
– Wiring, especially fiber, expensive
– Wireless initially more expensive, less
overall cost
• Routers
– Expensive ones make network use
efficient
– Cheap ones, but not very efficient. QoS!
Bigger pieces
• Network backbone:
– ATM infrastructure. REALLY expensive!
But uses network more efficiently.
– IP Gigabit infrastructure. Cheaper, but
doesn’t go very far, doesn’t use
network efficiently. Wiring expensive.
– Dedicated WAN systems: Frame, T1,
and more.
What do we want to do?
• Applications
–
–
–
–
–
–
E-mail
Browsing a web site
Creating a web site
Video/audio conferencing
Receiving small messages
Sending small messages
E-mail
• The usual way - Simple Mail
Transfer Protocol (SMTP) over
Internet links.
• Can be slow links.
• Older ways - E-mail via shortwave
radio modems, dial-up to dial up
networking, other radio systems.
Browsing a web site
• The usual way - HTTP via an
Internet link
• Can be cached - Local (proxy) server
stores pages, and passes them on
to users.
• Synchronization technologies
(Avantgo and more) can deliver
pages for later browsing.
• Wireless web, voice web? Low
bandwidth browsing.
Creating a web site
• The usual way - editing files online
(UNIX) or uploading files to web
sites.
• More advanced modern ways - XML
creation of content.
• Can E-mail updated sites, especially
if using XML.
• Experiments with updating web
sites using XML for mountain
climbing.
Receiving small
messages
• Usual way - peer to peer chat
clients, cell phones, etc.
• Can be VERY low bandwidth
• Multiple radio systems can carry
the information from a big
transmitter to a large region.
Transmitting small
messages
• Same method: chat clients, cell
phones.
• Still low bandwidth
• Need power at your end to send a
signal a long distance.
How to get information
around cheap
•
•
•
•
•
Low-speed radio networking
high-speed radio networking
Satellite messaging
Satellite network connectivity
By foot!
Low-speed radio
• Often used in
Amateur Radio
• Emergency use
• TNC - Terminal
network controller
• CHEAP! $500.
• 1200 bps or 9600
bps. Long range.
• Messaging, GPS,
other data
packets.
Cheap high-speed radios
• IEEE 802.11b
standard
• 11 Mbps over short
range. 1 Mbps
short.
• Can be extended
to large range over
flat terrain
• cheapish: $500$1,500.
• Real Internet
Advanced Radios
• Extreme range
• High speed
(4.5Mbps to 33+
Mbps)
• Able to handle
yucky topography
• More expensive:
$3000+
• “Social Intranets”
Satellite solutions
• Satellite highspeed Internet:
Expensive, but
fast. Slow
possible.
• Satellite phone
services - dial up
network and SMS.
• Satellite
messaging - cheap
two way SMS-like
messages.
By Foot?!
• Can place content, deliver content,
via CD-ROM/DVD-ROM, etc.
• Can update via messaging systems.
• Limited, but possible.
• Don’t knock it. The government
does it!
Hybrid solutions
• Direct PC - high speed downlink of
data from space.
– Uses phone link back
– Can use other routes back, like radio
networks, maybe even SMS?
– Has very high speed “package”
delivery.
– Small, cheap, easy to use.
What’s best?
• Up to you! Go build solutions.
• Different situations determine
needs
– Arctic different from here
– Arctic different from Africa, Malaysia.
– Different topography, needs, culture
• “Society Intranets” can help
maintain culture. Internet can
impact on culture.
• Who pays?