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- Newsgroups: comp.unix.bsd
- Path: sparky!uunet!newsgate.watson.ibm.com!yktnews!admin!w2chase
- From: cchase@watson.ibm.com (Craig Chase)
- Subject: (386BSD) Modems and com ports
- Message-ID: <1992Aug20.171557.30071@watson.ibm.com>
- Sender: w2chase@watson.ibm.com (Chase C)
- Date: Thu, 20 Aug 1992 17:15:57 GMT
- Disclaimer: This posting represents the poster's views, not necessarily those of IBM
- Nntp-Posting-Host: tweetie.watson.ibm.com
- Organization: Electrical Engineering, Cornell University, Ithaca NY
- Keywords: internal or external?
- Lines: 28
-
- So, before I go plunk $250+ on a modem I wonder if someone could
- clarify the situation with dropped characters on a serial line.
-
- I understand that the 386BSD device drivers have trouble keeping
- up with high-speed serial communications, but how much trouble
- and how fast? The FAQ lists 38K bps as higher than you're likely
- to be able to go, does this mean the 19.2K would be OK with sl/ip?
-
- (BTW: 19.2K being MNP5 + V.32 and quite doable on a modem
- with V.32bis + V.42bis you can go up to 56K)
-
- My *real* question is, will it matter if I get an internal modem
- or an external modem? From a performance standpoint, it would
- seem that an internal modem has a little less hardware between the
- phone line and the bus, and so might have less trouble at the
- higher performance rates. But then, I tend to doubt that it
- makes any difference you could notice from a device driver.
-
- On the other side of the coin, an external modem could conceivably
- be hooked up to a smart (buffering?) serial card that might
- solve the dropped character problem altogether.
-
- Of course, external modems cost about $20-25 more...
-
- Any thoughts?
-
- Craig
- cchase@ee.cornell.edu
-