Subj : Telnet/Rlogin speed?
To : Kirkman
From : Digital Man
Date : Mon May 21 2018 04:50 pm
Re: Telnet/Rlogin speed?
By: Kirkman to All on Fri May 18 2018 01:31 pm
> Is there a way in JS to detect the speed of a telnet or RLogin connection?
No. Unlike in the old days of the circuit-switched telephone network where you
could get a guaranteed consistent rate, there's no equivalent over the Internet
where through-put of an individual TCP session (e.g. Telnet, RLogin) can change
at any time depending on an unbounded number of factors.
So even if you could somehow test the connection and determine its speed upon
connect, it would likely change (up and down) later. RLogin does include an
optional terminal speed field, but its not really relevant or useful over the
Internet.
> I see that there's system.node_list[0].connection, but this seems to always
> return 65534 if I connect by telnet, even if I set SyncTerm to 19,200bps.
Yes. SyncTerm just emulates the speed (upon display of receive data), it still
sends and receives at whatever the maximum through-put of the TCP/IP connection
is.
> Same thing if I connect with an old Atari ST using a Lantronix
> telnet-to-serial device at 19.2.
Point-to-point serial connections have a fixed maximum throughout (DCE rate)
while packet connections of inter-connected WANs (the Internet) do not.
digital man
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