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VK3JMA > TECHNI 25.08.03 01:23l 102 Lines 4509 Bytes #999 (0) @ WW
BID : 730206VK3JMA
Read: DL4MEA GUEST OE7FMI
Subj: Re: RF-LAN
Path: DB0ZKA<DB0GPP<DB0LX<DB0RBS<DB0SWR<DB0FP<DB0CWS<DB0SIF<DB0EA<DB0RES<
ON0AR<7M3TJZ<HA3PG<VK3AVE<VK6HGR<VK3AYM<VK3DSE
Sent: 030824/0208Z @:VK3DSE.#MEL.VIC.AUS.OC #:56616 [Narre Warren] FBB7.00g25
From: VK3JMA@VK3DSE.#MEL.VIC.AUS.OC
To : TECHNI@WW
Hello Barry,
VK2AAB wrote:-
> Hello Mark VK3JMA has made some suggestions for using the 2.4Ghz gear that is
> commercially available.
> Mark, what do you propose as a network geometry ?
>
> It seems to me that to cover a large part of say Melbourne or Sydney a small
> number of sites would be needed but the amateurs who would be using this
> system will be in all directions. Which is why I raised the problem of power.
>
> Another question; How will transmitter identification be done ?
> My understanding is that they use TCIP. However that will not do for idents.
> Can we get at the programming for these devices ?
> Its true that the band is shared with class licenced users. However if we want
> to tie the network we developed into the wider amateur network it would need
> to carry the appropriate identifications.
>
> I know this is getting ahead of the game somewhat but we will need to have
> some idea how we can acheive the legal requirements.
>
> From memory I think the lower 8 or 9 channels of the class licence channels
> are in the amateur band. This means we will need to prevent other users from
> using our system. I think we can do this using the 44.x.x.x addresses.
> Is this so ?
>
> There is a section of the ARRL web site devoted to these techniques so there
> maybe something there about idents.
All very good points. I am not an expert by a long shot just a amateur
with a exterme interest in networking and RF data transmission.
Yes, 44.x.x.x IP addreses can be used for the level 3 layer routing and
protection from 'NON' amateur's can be achieved by, firewalls, login's,
encryption, most of the stuff used on the internet these days!
While travelling around on the 2.4 GHz system, is there a need for ID's?
I would suggest not, but when moving from a class-licence system to a
Licenced system, such as our normal AX25 stuff, yes ID's required.
Naturally this can be acheived via Login's, you would log onto a
class-licenced system with a username=callsign, and that then could be
carried on through the network into the ax25 world. Linux does this now.
I can log onto my linux ax25 system from any computer on my LAN using
192.168.0.x ip address with "vk3jma" as logon and whatever as password
then if I where to initate a "call ax0 vk3xyz" then out onto 2m would be
my callsign "VK3JMA>VK3XYZ:SABM". And this hold true for any login name
that is allowed by the Linux system.
Passwords can naturally be protected, remember that while in the TCP/IP
world on a class-licence system you have all the wonderful services
available to use, including secure login web pages!!!
Now, low power can present a problem. But in an earlier bulletin I made
mention of a 50 Km link established between Mt. Dandenong and St. Albans.
Goes to show what can be done and if the need for Hi-Sited Repeaters, as
we do now with 1200bd AX25, then maybe that is a solution.
Why not just treat the system on 2.4 GHz as a "semi public" access system
in the Class Licence area of the spectrum. By 'semi-public' I mean that
the Amateur Radio Operator or club that sets up an inter-linked system has
the "rights" (maybe wrong word but will do for now) as to whom uses the
system. Clubs can limit members, individuals can limit as well.
Remember, it lies outside the AR legal issues.
Although not condoning the "selective" access idea, it is a possible
solution to the problem of running ham access in a shares area of the
spectrum.
Whatever happens, I will be running a semi-public system, probally with
access to a 2m 1200bd port ax25 mail services collected from nntp servers
on the internet. There will be local web page access as well as smtp,
pop3, ftp, telnet and what ever other services I can get to work on the
linux system. This is why I do it, I enjoy software configuration and
network support activities and if this is a way to experience real life
situtations in a closed enviroment then so be it.
Even the thought of having a WebCam to WebCam "qso" via the 802.11b system
with fellow hams on the WLAN is a great incentave to "give it a go" and
"move forward".
I have yet to read the ARRL section you mention barry but it goes on the
list with everything else in life......
Many thanks for your thoughts, ideas, critisums (always welcome if
constructive).
73
Mark
-------------------------------
73 - Mark, VK3JMA
email: vk3jma@net2000.com.au
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