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- Path: sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!utgpu!attcan!telly!gvb
- From: gvb@telly.on.ca (George VandeBunte)
- Newsgroups: comp.dcom.modems
- Subject: Re: ZyXEL voice and flow control
- Keywords: ZyXEL voice flow control
- Message-ID: <2B4AF74B.602A@telly.on.ca>
- Date: 6 Jan 93 15:14:18 GMT
- References: <rkimball.725840444@athena> <1993Jan04.235850.9340@tyrell.tynet.sub.org> <rkimball.726258443@athena>
- Organization: Somewhere just far enough out of Toronto
- Lines: 76
-
-
-
- >>ZyXEL modems use XON/XOFF in voice mode. I'd appreciate to
- >>see a new ROM revision supporting
-
- >>1.) Proper RTS/CTS flowcontrol in voice mode
-
- This would be OK, however the current method is not unreasonable
- and should not inhibit you from developing your voice application.
-
- When one is sending voice, it is prudent to read information from
- the DCE (modem) since the modem will be decoding the DTMF buttons pushed.
- The information is shielded by <dle>. Thus a program should look
- for <dle> shielded xoff, xon, 0, 1,2,3,4,5,6,7,8,9,#,*,c(t-30 signal),
- b(busy),
- or <etx>, VCON. This is one of the nice features of the voice, that
- you can be decoding DTMF information both on sending and receiving
- voice.
- In summary, the program should already be looking for characters, so
- it can also look for xoff, and if your style of programming is to write
- modular code to handle this DCE communication, it shouldn't be too
- difficult to put in a pause xoff/xon.
-
-
- >>2.) Reliable DTMF recognition
-
- I believe the engineers have been listening, because on the version
- I am testing, the DTMF recognition is much faster--The modem recognizes
- the numbers as fast as I can push them (when transmitting also).
-
- We have suggested also recognizing a dial tone. However one could recognize
- this by examining the received voice since it is a constant monotone.
- One problem
- with this is that different countries have different dial tones. Perhaps
- a simple software routine (not necessarily in the modem) could recognize
- any constant (mono)tone of say 6 seconds, and thus one could disconnect.
-
-
-
- >>3.) Reliable at&d3 mode (*really* hangup on DTR->low)
-
- A DTR problem was recently fixed --when DTR and RTS dropped at the same
- time the modem wasnot hanging up. (5.04x) (by the way be sure DTR is
- not going low when you are changing the parameters or changing the
- parameters may have lower priority than resetting to default on DTR low.
- I think this is an example of the intention to aggressively reset on DTR low.)
-
- >>4.) Adjustable volume gain in voice mode
-
- Unfortunately, the speaker/ amp in the modem is not a 50 watt job , so I am
- not sure this will solve the voice volume. Of course, the voice files
- can be played on the pc speaker etc also-- but same problem. You get a nice
- volume listening in on an extension phone/ speakerphone . The speaker got
- bigger a few months ago-- I think they are trying in this area.
-
-
-
- >One more thing I would add to the list, this one really annoys me...
-
- >5.) Recognize and report DTMF while transmitting voice. This is really needed
- > for proper voice mail so that while playing your greeting the call can
- > enter DTMFs to get to a mailbox, without having to listen to the entire
- > greeting.
-
- As stated above, this works very well. I agree this is important, and many
- people seem to think it is not implemented.
-
- >How can we report this to the ZyXEL engineers?
- I believe they have their ear near the ground already.
-
- I work for OCOMP which provides ZyXEL modems /etc in Canada
- OCOMP Optimizing COMPuters gvb@telly.on.ca
-
- --
- 416 5341508
- .
-