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- Path: kula.usp.ac.fj!atkinso3
- Newsgroups: alt.winsock.trumpet,trumpet.questions,comp.dcom.isdn,comp.dcom.modems,psi.interramp.isdn
- Subject: Re: ERROR-com port overrun-what is that?
- Message-ID: <atkinso3.827563874@kula.usp.ac.fj>
- From: atkinso3@kula.usp.ac.fj (<Insert Name>)
- Date: 23 Mar 96 06:51:14 GMT
- References: <4ip6ib$aa3@usenet6.interramp.com>
- Nntp-Posting-Host: kula
-
- Daveros@interramp.com writes:
-
- >I'm using a software package called Internet valet w/ Trumpet winsock and
- >an ISDN connection, connecting to PSI Interramp as my service provider. I
- >changed the slip baudrate line from 57,600 to 64,000, my com port is set
- >at it's maximum, 115,200 (using turbocom 2 software comport driver
- >(Windows 3.11). For one thing, when I connect, trumpet is telling me I'm
- >connecting at 115,200-which of course is incorrect because I'm only using
- >one b-channel. So does this probably mean that a)I am connecting more than
- >57,600, but b)less than 115,200 so c)am probably connecting at 64,000? I
- >get these com port over errors sometimes. Not all the time, just
- >sometimes. I tried going to a web page listed in alt.winsock.trumpet but
- >could not get in....? Please explain what's happening here!
-
- >Thanks!
-
- >Daveros@interramp.com or Davidros@ix.netcom.com
-
- Dave,
- data read into a comm port is buffered. The CPU fetches words from the
- buffer. When the data buffer fills up it overwrites (wrapover) one of the
- previous buffer locations. When this occurs you lose information that you
- need. This is known as buffer overrun.
-
- This occurs when you have a data transfer rate too high for your CPU
- to handle.
-
- What CPU do you have ?
-
- Alternately, older chips cannot handle high transfer rates.
-
- Hope this helps.
-
- Alfred Prasad.
- Uni. Of the South Pacific, Fiji.
-