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Re: Secure voice software issues
- To: [email protected]
- Subject: Re: Secure voice software issues
- From: peter honeyman <[email protected]>
- Date: Fri, 13 Aug 1993 08:54:42 -0400
- In-Reply-To: shipley's message of Thu, 12 Aug 1993 14:54:30 -0700.
> do not use error correction or compression. (they will slow you down)
huh?!? my file transfer times would *double* if i turned off v.42bis
(modem compression). *that* would slow me down. and you can't run
v.42bis without running the error handling protocol (v.42), for obvious
reasons. what's more, v.42 gives an immediate 20% (or so) increase in
throughput, by eliminating start and stop bits.
arguably, i could (and should) be running compression in my slip or ppp
driver, but certainly it is false to say that v.42bis and v.42 slow me
down -- the opposite is true.
> and tcp does it's own error correction. as for 160ms round trip times
> that is acceptable for slip.
i don't much care about round-trip times, as i use my slip line principally
for afs, which runs as a data stream. round-trip delays are amortized over
phil karn's points about modem buffering interfering with type-of-service
queueing are the strongest condemnations of modern modems, in my view.
i wish someone would build a modem that recognized ip packet framing.