Busy flag and Dial tone

[derek]

Hi,

Do anyone know how to detect busy flag and dial tone of a 2 wires
telephone line by MCU and telephone related IC?

Thanks!

 

[Rich Grise]

On Sat, 25 Dec 2004 08:26:40 -0800, derek wrote:

Hi,

Do anyone know how to detect busy flag and dial tone of a 2 wires
telephone line by MCU and telephone related IC?

Sure! Use a modem!

Good Luck!
Rich

 

[Don Lancaster]

Rich Grise wrote:

On Sat, 25 Dec 2004 08:26:40 -0800, derek wrote:

Hi,

Do anyone know how to detect busy flag and dial tone of a 2 wires
telephone line by MCU and telephone related IC?


Sure! Use a modem!

Good Luck!
Rich

There are special chips called "Call Progress Detectors" Teltone is?/was
one source.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Ken Taylor]

"derek" <dereklai2k@yahoo.com.hk> wrote in message
news:1103992000.345346.48920@z14g2000cwz.googlegroups.com...

Hi,

Do anyone know how to detect busy flag and dial tone of a 2 wires
telephone line by MCU and telephone related IC?

Thanks!

A call progress detector would do the trick, such as an MX663:

http://www.cmlmicro.com/Products/WTelecom/FX663.htm
or a modem chip would suffice, such as a CMX867 -
http://www.cmlmicro.com/Products/WTelecom/CMX867.htm

I just grabbed these examples in a quick search, you want to see what is
available once you know the key terms to search for. A modem chip may be
more easily obtainable than a call progress detector, though the latter
would, at first thought anyway, be easier to program. In a pinch you could
get a PIC with a modem built-in and use that.

Ken

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