home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!dtix!darwin.sura.net!jvnc.net!yale.edu!yale!gumby!destroyer!caen!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!network.ucsd.edu!qualcom.qualcomm.com!cancun!rdippold
- From: rdippold@cancun.qualcomm.com (Ron Dippold)
- Newsgroups: comp.dcom.modems
- Subject: Re: Why not PEP over cellular?
- Message-ID: <rdippold.711919402@cancun>
- Date: 23 Jul 92 19:23:22 GMT
- References: <1992Jul7.061358.935@apt.bungi.com> <1992Jul10.201124.4404@fnbc.com> <clemon.08f0@lemsys.UUCP> <BOB.92Jul17141605@volitans.MorningStar.Com> <1992Jul23.135418.11714@trantor.harris-atd.com>
- Sender: news@qualcomm.com
- Organization: Qualcomm, Inc., San Diego, CA
- Lines: 37
- Nntp-Posting-Host: cancun.qualcomm.com
-
- dwilliam@jabba.ess.harris.com (David Williams) writes:
- > Well, the problem is : How do you tell the difference between your
- >target telephone (the office machine) giving up and hanging up the line
- >and the cellular link handing off to another cell? Both involve service
- >interruption. Some cell handoffs can get really long, due to local
- >traffic and signal quality.
-
- > To make this work, you would have to have some way to tell the
- >difference between a loss of signal and a handoff, which the cell
- >network does not provide (untill your call comes back, that is... :-)
- >At least, I think that's true - anyone out there work for a cell-phone
- >related business? Anyway for a smart modem to tell the difference?
-
- Yes, there most definitely is a handoff order. If you don't get the
- handoff order, you lose the call when the cell hands off and you
- don't. There could be a way for the phone to talk to the modem, but
- it'd probably have to be designed for that, or all the smarts would
- have to be in the modem.
-
-
- >tended to get it confused). Cell phone handoffs, in my experience, tend
- >to have a good bit of line noise and hash added in. Is this due to the
- >fact that I've only used a cell phone in a poor service area?
-
- I've never seen a handoff that didn't produce noise, if only a
- clicking. It's discontinuous - you get off one channel, tune to
- another, then hop on that channel.
-
-
- >How do cell phones do when they are presented with a large variety of
- >excellent signals?
-
- They usually don't pay attention to the other signals unless the
- current one gets too weak, which makes sense. You don't want to hand
- off more than necessary.
- --
- Liberal: A Conservative who has just been arrested.
-