[UK-CONTEST] Telnet

[Andy Cook, G4PIQ]

I just did a quick check here. 1 spot is 119 bytes (inc 40 byte TCP/IP
header and 40 byte ack packet). Oddly enough, what actually really costs
you usage on GPRS is sending data to the cluster since telnet sends one
character at a time. Each character sent, including TCP/IP headers &
ACKs are 81 bytes. 

Andy, G4PIQ

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Steve Bunting
Sent: 13 December 2003 07:43
To: uk-contest-X-contesting.com-POP-1 at mail-x-change.com
Subject: [UK-CONTEST] Telnet


Hi again everyone,

I have a brief question for you all from a computing innocent.....

I am looking into telnet cluster access to using a GPRS mobile phone.
The idea is to get reliable cluster access from a remote contest
location, RF links have proved to be nothing but trouble. I am trying to
assess the cost of keeping the link live for a 24hour contest. As you
probably know the phone companies charge per MB transferred rather than
unit time, with Orange it is 2.55UKP plus VAT per MB. 

Now my questions: how many bytes constitute one cluster spot? A more
difficult question is how many spots are there per contest weekend? I am
guessing at a mean of 3 spots per minute, i.e. 180 per hour and
therefore 3420 per 24 hours. Lets round that up to a ballpark 5000. Is
that reasonable for a FD? 

I don't want to commit to a route that will cost a fortune to keep
alive, but I am guessing that a single spot is pretty small. If I am
feeling very tight, I can probably reduce traffic (and hence costs) by
setting filters at the cluster.

Can anyone advise or add experiences to this?

Thanks as always.

73
Steve
M0BPQ


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