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- Newsgroups: comp.dcom.modems
- Path: sparky!uunet!usc!rpi!uwm.edu!psuvax1!postscript.cs.psu.edu!fenner
- From: fenner@postscript.cs.psu.edu (Bill Fenner)
- Subject: Re: ZyXEL voice and flow control
- Message-ID: <C0Ju99.3F4@cs.psu.edu>
- Keywords: ZyXEL voice flow control
- Sender: news@cs.psu.edu (Usenet)
- Nntp-Posting-Host: postscript.cs.psu.edu
- Organization: Penn State Computer Science
- References: <C0GHIz.MoJ@wsrcc.com> <C0Goy4.8A0@cs.psu.edu> <1993Jan7.160410.26277@netcom.com>
- Date: Fri, 8 Jan 1993 19:03:08 GMT
- Lines: 25
-
- In article <1993Jan7.160410.26277@netcom.com> qualtrak@netcom.com (Qual Trak) writes:
- |In article <C0Goy4.8A0@cs.psu.edu> fenner@postscript.cs.psu.edu (Bill Fenner) writes:
- |>In article <C0GHIz.MoJ@wsrcc.com> wolfgang@wsrcc.com (Wolfgang S. Rupprecht) writes:
- |>|Having to deal with software flow control forces one to write fairly
- |>|inefficient code.
- |>Hardly; XON/XOFF is the TTY driver's job. Set IXON, and feel free to write
- |>gobs and gobs of data and let the TTY driver worry about flow control.
- |Pray tell me where I can find a tty driver that can look for "dle
- |shielded" xon xoff sequences.
-
- Not necessary. First of all, I'm not sure that the XON/XOFF *are* really
- DLE shielded when in voice transmission mode. Second of all, it doesn't
- matter to the TTY driver if there's a DLE before the XON or XOFF; <DLE><XOFF>
- is still an <XOFF>.
-
- The thing to remember is that you're transmitting, and the only thing that
- you could receive back from the modem is:
- a) flow control
- b) touch tone information
-
- So the worst that could happen is that you will get an extra <DLE> in the data
- strem, which is easy enough to check for, since <DLE><DLE> has no meaning
- in this context.
-
- Bill
-