14 Nov
2019
14 Nov
'19
1:07 a.m.
On Wed, 13 Nov 2019, Electronics Plus via cctalk wrote:
And here my problem is that I have the old modems, but
I can't test them
because I no longer have a land line. Is there any way to test an
internal or external modem without anything except broadband or cellular
connections? I know I can't test the acoustic modems, but I was hoping
to be able to test internal ISA and PCI, as well as external modems from
300 baud to 56k. Perhaps there is some inexpensive gizmo available?
A "telephone line simulator".
In some cases, you might be able to just connect them, with a power
supply.
One set to "Originate" and one to "Answer", of course.
But, you also want a "dial tone".
And, if you want to test answering capabilities, then you also need a
"ring simulator", which is 90VAC at 20Hz. (often a lot of tolerance)
What do you need to do to use an acoustic modem with a cellphone?
You can get a "retro" handset for a cellphone, that will fit the rubber
cups, but, will it work?