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2004-12-20 by Greg Koss
Hi All, To deviate from the main topic a bit, I am looking for a source of Caller ID chips. I would rather work with the HT9032 series or the MC14LC5447. I can not find a source of these chips that is within the price range of a hobbyist. Does anyone out there now of a source for any of these chips, must be DIP, or another chip that does Caller ID? Thanks for all your help.
2004-12-20 by David Rea
Hi Greg- This document has some good information about caller ID service: http://www.epanorama.net/documents/telecom/cid_bellcore.html It indicates that the signalling spec for Caller ID is simply Bell 202 signalling. This means that you could go out and find yourself an old modem, rip out the Bell 202 transciever and phone line interface magnetics, and theoretically have a workable setup. You could also use a Texas Instruments TCM3105 modem chip. They have been discontinued, but are available for under $20US from http://www.tcm3105.com/ Remember to optoisolate! :) Good Luck, Dave Quoting Greg Koss <gkoss@netzero.net>:
> Hi All, > > To deviate from the main topic a bit, I am looking for a source of > Caller ID chips. I would rather work with the HT9032 series or the > MC14LC5447. I can not find a source of these chips that is within > the price range of a hobbyist. Does anyone out there now of a source > for any of these chips, must be DIP, or another chip that does Caller > ID? Thanks for all your help. > > > > > > > ------------------------ Yahoo! Groups Sponsor > > > Yahoo! Groups Links > > > > > > > >
2004-12-20 by Peter Gargano
This thread reminds me of a project I'd like to start (if I had the time). I want a simple, intelligent, 3 (up to 8) line PABX (Private Automatic Branch eXchange) using "normal" phones. Maybe someone has seen a DIY PABX somewhere? Peter David Rea wrote:
> Hi Greg- > > This document has some good information about caller ID service: > http://www.epanorama.net/documents/telecom/cid_bellcore.html > > It indicates that the signalling spec for Caller ID is simply Bell 202 > signalling. This means that you could go out and find yourself an old > modem, rip out the Bell 202 transciever and phone line interface > magnetics, and theoretically have a workable setup.
2004-12-20 by Kathy Quinlan
Peter Gargano wrote: > This thread reminds me of a project I'd like to start (if I had the time). I > want a simple, intelligent, 3 (up to 8) line PABX (Private Automatic Branch > eXchange) using "normal" phones. > > Maybe someone has seen a DIY PABX somewhere? > > Peter Yeah, I have designed many PABX's over the years, Some used special handsets, others stock standard 48V handsets. First you need to decide what you want, as some features are not easy to impliment without custom parts, my last one I designed for a specific aplication used SLIC's (Subscriber Line Interface Circuits) out of an old NEC PABX (D3 or in au Telecom system 120) as these handle all the line conditioning, ring and tone switching etc. Regards, Kat. -- --------------------------------------------------------------- K.A.Q. Electronics Website: www.kaqelectronics.dyndns.org IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org For Everything Electronics Phone: 0419 923 731 --------------------------------------------------------------- -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.1 - Release Date: 20/12/2004
2004-12-21 by Peter Gargano
Re: [AVR-Chat] Source of Caller ID Chips Kathy Quinlan wrote: > Peter Gargano wrote: >>This thread reminds me of a project I'd like to start (if I had the time). I >>want a simple, intelligent, 3 (up to 8) line PABX (Private Automatic Branch >>eXchange) using "normal" phones. >> >>Maybe someone has seen a DIY PABX somewhere? >> >>Peter > Yeah, I have designed many PABX's over the years, Some used special > handsets, others stock standard 48V handsets. I was thinking of something simple that (if possible) used the standard AU Telstra phone (ie. 48V tone dial). All I'm after is something that would allow anyone to pick up a call on one or two lines, and transfer it to another line (up to 7 other lines). To be honest, I have not done any homework on what's required to do this. I figured someone else had maybe done something similar that could be adapted, so I didn't have to start out from scratch. And yes, I know the biggest issue is one of safety, and I was thinking that it could be powered from a battery that could be recharged periodically, so no direct connection to the mains. A 5 or 6 Volt to 48 Volt supply is pretty easy to organise. > First you need to decide what you want, as some features are not easy to > impliment without custom parts, my last one I designed for a specific > aplication used SLIC's (Subscriber Line Interface Circuits) out of an > old NEC PABX (D3 or in au Telecom system 120) as these handle all the > line conditioning, ring and tone switching etc. Kat, are any of these designs in the public domain? Peter Gargano
2004-12-21 by Kathy Quinlan
Peter Gargano wrote: > Re: [AVR-Chat] Source of Caller ID Chips > > Kathy Quinlan wrote: > >>Peter Gargano wrote: >> >>>This thread reminds me of a project I'd like to start (if I had the time). I >>>want a simple, intelligent, 3 (up to 8) line PABX (Private Automatic Branch >>>eXchange) using "normal" phones. >>> >>>Maybe someone has seen a DIY PABX somewhere? >>> >>>Peter >> >>Yeah, I have designed many PABX's over the years, Some used special >>handsets, others stock standard 48V handsets. > > > I was thinking of something simple that (if possible) used the standard AU > Telstra phone (ie. 48V tone dial). All I'm after is something that would allow > anyone to pick up a call on one or two lines, and transfer it to another line > (up to 7 other lines). > > To be honest, I have not done any homework on what's required to do this. I > figured someone else had maybe done something similar that could be adapted, > so I didn't have to start out from scratch. > > And yes, I know the biggest issue is one of safety, and I was thinking that it > could be powered from a battery that could be recharged periodically, so no > direct connection to the mains. A 5 or 6 Volt to 48 Volt supply is pretty easy > to organise. > > >>First you need to decide what you want, as some features are not easy to >>impliment without custom parts, my last one I designed for a specific >>aplication used SLIC's (Subscriber Line Interface Circuits) out of an >>old NEC PABX (D3 or in au Telecom system 120) as these handle all the >>line conditioning, ring and tone switching etc. > > > Kat, are any of these designs in the public domain? Nope, all the designs are behind NDA's due to the cost of the permits for them :( But I can advise on design issues to maximise safety etc, I would not worry about running on batteries, they will not last long (unless you are talking a big battery) It is very easy to design for safety, just make sure you use lots of isolation transformers and relays etc. I can provide some schematic snipets of line and phone interface circuits, and if you are in WA I can probably give you some SLIC's etc from NEC as I have a fair few (ummm well most of the Spares in WA for the D3 series) Regards, Kat. -- --------------------------------------------------------------- K.A.Q. Electronics Website: www.kaqelectronics.dyndns.org IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org For Everything Electronics Phone: 0419 923 731 --------------------------------------------------------------- -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.1 - Release Date: 20/12/2004
2004-12-21 by Peter Gargano
Kathy Quinlan wrote: >>Kat, are any of these designs in the public domain? > > Nope, all the designs are behind NDA's due to the cost of the permits > for them :( I understand > But I can advise on design issues to maximise safety etc, I would not > worry about running on batteries, they will not last long (unless you > are talking a big battery) It is very easy to design for safety, just > make sure you use lots of isolation transformers and relays etc. I understand. I wanted to make sure that people didn't get the wrong idea about the safety aspect of this kind of work - not safety for the user, but the telecoms service provider. > I can provide some schematic snipets of line and phone interface > circuits, and if you are in WA I can probably give you some SLIC's etc OK, simple (?) question then ... if I have two lines in, and 8 phones, and I want any phone to connect to any line, then what's the cheapest and/or easiest way to have a cross-point switch to do that? I'm assuming that somewhere there's an AVR that may have to do some tone decoding (or interface to a tone decoder) to perform the transfer function from one phone to another phone. > from NEC as I have a fair few (ummm well most of the Spares in WA for > the D3 series) I'm in the ACT and I use TransACT, a service provider who uses fibre to within 300 m of all endpoints. They also provide high speed packet switching and a "cable TV" service, all on the one fibre. Peter Gargano
2004-12-21 by fnatmed
--- In AVR-Chat@yahoogroups.com, "Greg Koss" <gkoss@n...> wrote: > > Hi All, > > To deviate from the main topic a bit, I am looking for a source of > Caller ID chips. I would rather work with the HT9032 series or the > MC14LC5447. I can not find a source of these chips that is within > the price range of a hobbyist. Does anyone out there now of a source > for any of these chips, must be DIP, or another chip that does Caller > ID? Thanks for all your help. Every phone out there does CallerID these days. What do the big boys use for it ? Cellphones are compute monsters, so they probably do it all in firmware ... Come to think of it, so are most cordless phones too. Hrm - opportunity ? SOme do a TinyAVR as a CallerID decoder ? Dean.
2004-12-22 by Bruce Parham
fnatmed wrote: > > --- In AVR-Chat@yahoogroups.com, "Greg Koss" <gkoss@n...> wrote: > > > > Hi All, > > > > To deviate from the main topic a bit, I am looking for a source of > > Caller ID chips. I would rather work with the HT9032 series or the > > MC14LC5447. I can not find a source of these chips that is within > > the price range of a hobbyist. Does anyone out there now of a > source > > for any of these chips, must be DIP, or another chip that does > Caller > > ID? Thanks for all your help. > > Every phone out there does CallerID these days. What do the big > boys use for it ? Cellphones are compute monsters, so they probably > do it all in firmware ... Come to think of it, so are most cordless > phones too. > > Hrm - opportunity ? SOme do a TinyAVR as a CallerID decoder ? > > Dean. The Mitel MT88E46, now made by Zarlink Semi, http://www.zarlink.com looks good on paper though I'm not sure how one gets less than 50K parts. It's not listed on Digikey. Might try begging some samples. Bruce
2004-12-22 by Dave VanHorn
It's Bell 202 FSK. Any 202 modem chip should work, if you have a clean interface to pull the audio out.
2004-12-23 by stevech
cell phones' caller ID is done as digital data on the control channel - which is where calls are initiated and paging (ring) messages happen, plus handoff coordination.
-----Original Message----- From: fnatmed [mailto:fnatmed@yahoo.com] Sent: Tuesday, December 21, 2004 4:35 PM To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: Source of Caller ID Chips --- In AVR-Chat@yahoogroups.com, "Greg Koss" <gkoss@n...> wrote: > > Hi All, > > To deviate from the main topic a bit, I am looking for a source of > Caller ID chips. I would rather work with the HT9032 series or the > MC14LC5447. I can not find a source of these chips that is within > the price range of a hobbyist. Does anyone out there now of a source > for any of these chips, must be DIP, or another chip that does Caller > ID? Thanks for all your help. Every phone out there does CallerID these days. What do the big boys use for it ? Cellphones are compute monsters, so they probably do it all in firmware ... Come to think of it, so are most cordless phones too. Hrm - opportunity ? SOme do a TinyAVR as a CallerID decoder ? Dean. Yahoo! Groups Links
2004-12-23 by Chuck Hackett
> From: stevech > > cell phones' caller ID is done as digital data on the control > channel - which is where calls are initiated and paging > (ring) messages happen, plus handoff coordination. Sorry to continue this off topic but ... I've always wondered why land line phones Caller ID can display both alpha and numeric Caller ID but cell phones only display numeric information - can anyone tell me why? Cheers, Chuck Hackett Merry Christmas to all and may God bless you and yours in the coming year. "Good judgment comes from experience, experience comes from bad judgment" 7.5" gauge Union Pacific Northern (4-8-4) 844 http://www.whitetrout.net/Chuck
2004-12-23 by Kathy Quinlan
Chuck Hackett wrote: > > Sorry to continue this off topic but ... Mate this is not that off topic as it can be done with an AVR :) -- --------------------------------------------------------------- K.A.Q. Electronics Website: www.kaqelectronics.dyndns.org IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org For Everything Electronics Phone: 0419 923 731 --------------------------------------------------------------- -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 22/12/2004
2004-12-23 by Mark Jordan
On 23 Dec 2004 at 14:33, Kathy Quinlan wrote: > > Chuck Hackett wrote: > > > > > Sorry to continue this off topic but ... > > > Mate this is not that off topic as it can be done with an AVR :) > Any AVR with internal ADC can decode DTMF or BELL-202 Caller ID info. It is just a matter of programming. Mark Jordan
2004-12-23 by fnatmed
--- In AVR-Chat@yahoogroups.com, "Mark Jordan" <mark@c...> wrote: > On 23 Dec 2004 at 14:33, Kathy Quinlan wrote: > > > > > Chuck Hackett wrote: > > > > > > > > Sorry to continue this off topic but ... > > > > > > Mate this is not that off topic as it can be done with an AVR :) > > > > Any AVR with internal ADC can decode DTMF or BELL-202 Caller ID info. > It is just a matter of programming. How to make Rabbit Stew in 3 easy steps. 1) Catch a rabbit. 2) ... It's that first step that's the toughie :) AKA, just a matter of code. Has anyone done this ? I'm sure it's out there somewhere, just have to find it. Dean.
2004-12-23 by Mark Jordan
On 23 Dec 2004 at 15:45, fnatmed wrote: > > Has anyone done this ? I'm sure it's out there somewhere, just have > to find it. > For the DTMF decoding, I used this: http://www.embedded.com/story/OEG20020819S0057 For the BELL-202, this one: http://www.baycom.org/~tom/ham/da95/d_dspmod.pdf Mark Jordan