[comp.sys.mac] MNP 5

deh7g@newton.acc.Virginia.EDU (David E. Husk) (08/12/89)

	Does anyone out there in netland know what 'MNP 5' on a modeum
	meams?  Some type of error checking?  If so what?

						Thanks

						Husk@virginia.edu

mjkobb@mit-amt.MEDIA.MIT.EDU (Michael J Kobb) (08/16/89)

In article <3120@virginia.acc.virginia.edu> deh7g@newton.acc.Virginia.EDU (David E. Husk) writes:
>
>	Does anyone out there in netland know what 'MNP 5' on a modeum
>	meams?  Some type of error checking?  If so what?
>
>						Thanks
>
>						Husk@virginia.edu




MNP 5 stands for "Microcom Networking Protocol Level 5."  It consists of:
	An error-correction protocol (which is modem-based, so both modems must
support MNP 5.
	A high-speed data compression routine (written by a friend of mine), which
effectively boosts the throughput by 100% (so your 2400 baud MNP5 modem, talking
to another MNP5 modem, gets 4800 baud throughput).  Nifty, eh?

Unfortunately, level 5 is not real widely supported, since it's kind of expensive.
Compu$erve supports level 4, which has the error-correction and "adaptive
packetizing" (whatever that means -- adapts for line conditions?).  It does not,
however, support the data compression (why should they? then people could get
twice the amount of information for the same amount of money!)  Some businesses
and schools support level 5... check around...

--Mike

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