home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!utcsri!geac!uunet.ca!zaphod.mps.ohio-state.edu!darwin.sura.net!spool.mu.edu!umn.edu!math.fu-berlin.de!fauern!LRZnews!regent!monu1.cc.monash.edu.au!monu6!bruce.cs.monash.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!uqcspe!cs.uq.oz.au!anthony
- From: anthony@cs.uq.oz.au (Anthony Lee)
- Newsgroups: aus.comms
- Subject: Re: Call Waiting --- A better way of informing the user ?
- Keywords: flash, recall
- Message-ID: <11064@uqcspe.cs.uq.oz.au>
- Date: 16 Nov 92 23:10:06 GMT
- References: <11048@uqcspe.cs.uq.oz.au> <1992Nov16.214259.16017@cs.su.oz.au>
- Sender: news@cs.uq.oz.au
- Reply-To: anthony@cs.uq.oz.au
- Distribution: aus
- Lines: 30
-
- In <1992Nov16.214259.16017@cs.su.oz.au> matthew@cs.su.oz (Matthew Geier) writes:
-
- > The exchange doesnt signal the user via a loop break, its only the user
- >to exchange. The CW tone is just that , a tone superimposed onto the Audio
-
- Yes, but that's is a form signaling that goes way back to operator
- switch boards where a subscriber taps the hook slightly leading to
- a light flash at the operator console, hence the term "flash".
- But I don't see any technical reason why it can't be used for
- exchange to user signalling.
-
- >path. Old exchanges with CW might cause some thing that looks like a loop
- >break when it switches the tone generator onto the circuit , but the only
- >exchanges fitted with CW in Australia are digital. The tone can be added
- >before conversion to analogue, hence no click, just a tone.
- > You would have to detect the tone. I doubt the tone is exactly the same
- >between exchanges. The detector would have to be smart enough not to trigger
- >on hearing that frequency in normal speech..
-
- That's exactly my point, people who don't know about CW or have slight
- hearing impairment either don't notice it or ignore it altogether.
- If it is a light flashing then at least they will think what's the light
- for or hangup in which case the waiting call can get through.
- I am sure you can get a filter to detect the tone but surely such
- a filter would make the typical telephone too expensive.
- --
- Anthony Lee (Time Lord Doctor) (These are my opinions !)
- email: anthony@cs.uq.oz.au voice:+(61)-7-3651204 FAX:+(61)-7-3651999
- SNAIL: Department Computer Science, The University of Queensland,
- St Lucia, Qld 4072, Australia
-