The
Network
An Internet INDEPENDENT network free from Governments,
commercial Internet service providers, telecommunications companies, and
dubius Internet regulatory bodies. Advances in secure resource sharing
shall be developed to ensure interoperablility and a free flow of information
between participating groups. Gateways to the Internet will of course be
established, employing the best security methods known using Public Key
crypto and tumbling sessions.
While much innovative and "pie in the sky"research
is underway to implement highly dense wireless networks, the model for
such a network is way beyond the scope of this project. Conservatively,
this network will resembe the classic cellular telephone system.
Where there are cell base stations servicing a local area. A high
bandwidth link will interconnect these bases stations with others thereby
creating a web of base stations.
The main problem with this network is the intrinsic
fact that wireless long haul links are bandwidth crippled. The lower
the frequency the narrower the useable bandwidth. Eventually the
acquisition of a geostationary satellite will allieviate the long haul
network congestion, but I see this pursuit being a few years off.
In the interim, VPN (Virtual Private Network)
technology will be used to connect nodes which are unable to connect via
a radio link. Eventually as the Network web spreads across the world,
the VPN links will be replaced by wireless links where appropriate.
The Nodes
10GHz 10Mbit/s Data link
This will include a procedure to quickly align
the link and establish communications between remote nodes. Currently,
we are in the prototyping stage. Based on a circuit originally designed
by Glen Elmore (N6GN), functional improvements have been made with updated
components and combined with slight modifications to the original layout.
Antenna design is completly original, as well as a new ethernet interface.
In order to expedite the development of this link,
an interface for connecting a T1 modem to the Transceviers is underway.
It will most likely be much easier to modify than the all out construction
of a new ethernet interface.
This transceiver will be utilized for point-to-point connections only.
2.4GHz Commercial Equipment
This includes the popular 802.11/802.11b commercial
wireless equipment. Such vendors include:
Proxim (RangeLAN/Symphony)
Wavelan/Orinoco 802.11b cards
Digital Roamabout (pre 802.11 wavelan cards)
ZoomAir
SMC
D-link
Aironet
Breezecom
3com
For the price, the Proxim Symphony cards seem to be the cheapest and
easiest to modify. Some extensive work has been done by
multplx. Symphony
PCMCIA/ISA/PCI cards are generally under $100 used, slightly over $100 all
brandy new.
802.11b equipment is starting to appear on the market under the $200 range
for the top of the line cards (orinoco gold). Ethernet bridges can be
expensive, but you can configure a PC to act as one. Unlike the symphony
cards you are not locked into one vendor.
2.3GHz/1.27GHz 1.2Mbit/s CSMA links
These units are loosely based upon the S53MV designs
out of Slovenia. There will be two versions of this radio transceiver.
One configured for point-to-point operation, the other, configured for
cellular operation. They will utilize Binary Phase Shift Keying rather
than the standard Frequency Shift Keying found in most terrestrial based
packet stations. Methods are being explored to reduce the discrete component
count found in the existing designs with commercially available LNA's,
Power Amplifiers, I-Q Modulator/Demodulators, Mixers, and up/down converters.
900Mhz FSK / BPSK - DS Spread Spectrum links
While building equipment to outfit the network
is a laudable goal, it is not always the most productive and timely affair.
The celluar telephony market has now produced a glut of second and third
generation vehicular cellphones (brick units) that can be modified for
point to point, full duplex communications in the 900MHz Amateur Radio
Band.
There is also a plethora of second-hand NCR/AT&T/Lucent
Technologies Wavelan cards bubbling up out from the bowels of early Corporate
Wireless Lan pioneers. These units can operate at speeds of 2mbit/s
over a limited range. These corporate throwaways are prime resources
that can be utilized to get this network off the ground with a useable
link bitrate.
Community
Secure Data Transfer
Several layers of encryption will be employed
on the non-amateur portion of the network. However, robust authentication
mechanisms being explored to strengthen the packet networks of the radio
amateur. A highly streamlined version of IPv6 will most likely be
used for the link layer, however, since this is an NSA approved protocol,
another layer of encryption will be required to keep the spooks at bay.
Development Environment
The development platforms for the project will
focus on the free unix operating systems. Such as Linux, Free/Open/NetBSD,
and LynxOS. They are freely obtained, are widely supported and documented,
and are already widely used in the research and development sector.
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