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- Path: sparky!uunet!mcsun!fuug!demos!kiae!glas!demos!qiclab.scn.rain.com!leonard
- From: leonard@qiclab.scn.rain.com
- Newsgroups: comp.dcom.modems
- Date: 18 Jul 92 17:42 MDT
- Subject: Re: Why not PEP over cellular?
- Sender: Notesfile to Usenet Gateway <notes@glas.apc.org>
- Message-ID: <1992Jul18.134221.3638@qiclab.scn>
- References: <BOB.92Jul17141605@volitans.morni>
- Nf-ID: #R:BOB.92Jul17141605@volitans.morni:-1007531751:1992Jul18.134221.3638@qiclab.scn:2066605635:001:1707
- Nf-From: qiclab.scn.rain.com!leonard Jul 18 17:42:00 1992
- Lines: 36
-
-
- bob@MorningStar.Com (Bob Sutterfield) writes:
-
- >In article <clemon.08f0@lemsys.UUCP> clemon@lemsys.UUCP (Craig Lemon VE3XCL) writes:
- > Generally it is accepted, however, that when trying to carry on a
- > high-speed data connection via cellular, you will have the sense to
- > stop driving :-).
-
- >Why would I want to restrict myself to not driving while my connection
- >is open? After I conduct my interactive business and hit the road,
- >there may still be a long FTP transfer or source tree rdist or NNTP
- >update (often all the above, simultaneously) that don't require my
- >attention. I can pitch my SPARCbook in the other seat, with its disk
- >and modem still grinding away, and forget about it. After my notebook
- >and the office server are in sync and the traffic dies down, the PPP
- >link will idle out and hang up the cell call. And shortly after that,
- >the SPARCbook will shut itself down to conserve its batteries (unless
- >I have it plugged into the car's power bus, which Mazda has cleverly
- >camouflaged as a cigarette lighter socket :-).
-
- Perhaps you will want to stop because driving is equivalent to *really*
- trashing the bandwith. Things like dynamicly varying multipath distortion
- as you move.
-
- Last I heard they'd not guarantee *full duplex" data except when you are
- stationary. They suggest 300 bps *max* if you insisted on driving.
-
- The nature of a cellular signal *while moving* is such that the modem
- can't possibly retrain fast enough while driving thru the city.
-
- --
- Leonard Erickson leonard@qiclab.scn.rain.com
- CIS: [70465,203] 70465.203@compuserve.com
- FIDO: 1:105/56 Leonard.Erickson@f56.n105.z1.fidonet.org
- (The CIS address is checked daily. The others infrequently)
-
-