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- Path: giskard.demon.co.uk!dale
- From: dale@giskard.demon.co.uk (Dale Shuttleworth)
- Newsgroups: comp.dcom.modems
- Subject: Re: External modems are nonsense
- Date: Thu, 4 Jan 1996 20:58:28 GMT
- Organization: Dale's home Linux box.
- Message-ID: <DKoCxH.1tF@giskard.demon.co.uk>
- References: <5-62TlW4YgB@quijote.in-berlin.de> <Pine.SUN.3.91.951219091250.2982D-100000@cpu3> <4bd5sf$2n1@fieldday.mn.org> <sy3fa3vbbn.fsf@tiktok.cygnus.com> <4c44p9$8sl@steel.interlog.com> <Pine.SUN.3.91.960102093642.11497C-100000@cpu3> <4cg61i$810_002@dialupS163.ici.net>
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-
- Hi,
-
- David Ehrens (david@pencilnet.com) wrote:
-
- [...]
-
- : Add to the plusses:
- : - external modems can be easily replaced with faster models
-
- Not really. Firstly, there aren't going to be many faster models :-) and
- secondly, if we are talking significantly faster, you are going to have
- to install a faster I/O port than the PC standard.
-
- : - external modems are the only modems supported by some OS vendors, such as
- : SCO
-
- Most internal modems look exactly like externals in hardware and software
- terms, it is impossible to support one and not support the other.
- (Assuming that we are staying with PC architecture).
-
- : - external modems are more likely to come with a manual describing the AT
- : commands for that model
-
- Perhaps, but marketing decisions can be changed.
-
- : - external modems are less likely to transmit a power surge to the
- : computer's bus, as an internal modem would
-
- Yes, but that is really a matter of poor design. I think I could give you
- 10kV isolation between an internal between phone line and ISA bus, but it
- depends how close adjacent cards are :-). Of course, if you're getting
- sustained volatges over 10kV, then I suspect your external modem is not
- necessarily going to be happy. Has anyone done some tests with a
- variety of modems and some big voltages? - Do externals actually offer
- any more protection?
-
- I bought an external (Courier). If I was going to buy one now, a lot
- depends on the application. For continual use, the "at a glance"
- status display on an external has a lot going for it - in a machine
- room its easier to notice an LED than it is to do something via
- software.
-
- For single experienced user use, I would suggest an internal, I *know*
- how to set up the modem, if its doing something odd, I don't need the
- lights to tell me whats wrong. Of course, if you're developing comms
- software then the lights *are* useful :-)
-
- For inexperienced users - who knows? I would suggest that it is
- probably easier for people unfamiliar with comms to understand
- what is going on if they can see lights flickering. Of course, if
- nothing ever goes wrong, they never need to understand whats happening
- - have modems reached that stage yet? :-)
-
- Dale.
- --
- ******************************************************************************
- * Dale Shuttleworth *
- * Email: dale@giskard.demon.co.uk *
- ******************************************************************************
-