> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tim McDonough
> Sent: Wednesday, 28 August 2002 3:44 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]:Telephone System Simulation
>
>
> I'm working on a project where a device with an internal modem
> needs to be tested in an environment where it will share a
> telephone line with other devices like telephones, fax machines,
> credit card machines, etc. Anyone have first hand experience with
> testers/simulators that can be programmed to produce phone line
> conditions such as other devices being off hook, etc.?
>
> Tim

If you were in Perth Au, I would say come on over lol I have PABX's of most
types, from the newer 12V line 50V ring to the older 48V line 115v ring :o)
(I hate KSU phones, I love old uP based exchanges, I have an Ericsson AXE
exchange in storage (anyone want to set up a community exchange ? (these
were the last ones used by our telco (Telstra)) It fell off a truck, and the
insurance company said it would cost more to repair than it was worth, SO I
bought it at auction, and apart from a few ripped connectors, dents and
scrapes in the caseing, it runs fine.

I would not blindly use a home PABX, untill I had verified that it has a
48Vdc line. I would also use an LCR network, to simulate some line length
(unless you have a few Km's of cable). I have had equipment work fine 2ft
from the exchange, but 10 - 20Km away and the line was not capable of
powering it :o( LCR networks are the best for simulating line lengths. If
you need info on calculating the LCR values for given line lengths I can dig
up the formula (it is provided in the AU phone regs (the one set of regs
cover aproval as well as instalation lol)

Regards,

Kat.

**********************************************
K.A.Q. Electronics.
Electronic and Software Engineering.
Perth, Western Australia.
Ph +61 (0) 419 923 731
**********************************************

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