Internet Service Providers forum

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Modem on Hold Feature of the V.92 modems

by natureboy / May 30, 2004 1:39 PM PDT

Hi, I am an engineering student and would like to know the principle of operation from which this feature has been developed. I can't seem to find any information as to how this feature is achieved.

I would greatly appreciate any info!!Thanx

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Re:Modem on Hold Feature of the V.92 modems
by R. Proffitt Forum moderator / May 30, 2004 10:53 PM PDT

It's a varient of call waiting. There is no magic and as such, no technology to investigate.

It's just a simple sprinkling of software.


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And a little hardware. . .
by Coryphaeus / June 6, 2004 11:41 PM PDT

The modem has to "flash" the line - on hook then off hook. Just like you have to do with the phone. Electrically, line close, line open between 250 and 650 milliseconds in duration. Any slower and the switch doesn't recognize it. Any longer and the switch considers it a disconnect.

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Re:And a little hardware. . . Said hardware is already in there.
by R. Proffitt Forum moderator / June 7, 2004 10:33 PM PDT

The entire "trick" is done with existing modem designs. It's mostly software, with the rest of the magic being co-operation between ISP and the Telco.


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Re:Re:And a little hardware. . . Said hardware is already in there.

Hardware is definately there. Each modem has a micro relay that does the function of "going off hook" to act like a telephone. It's software controlled so it will mimic a person going off hook, flashing the switchook, and hanging up.

Some of the newer modems may use ICs, gates, to do the function above.

As long as it works, huh?

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