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I currently tested the system with 6 serial client plus the server. it seem to work quite well but the cable were rather short. Is rs232 more prone to ground lo

I currently tested the system with 6 serial client plus the server. it seem to work quite well but the cable were rather short. Is rs232 more prone to ground loop than ethernet? i looked into using serial modem, but it seemed quite complicated, and very fragile. I didn't find a lot of guide to connecting directly two modem. I tried doing some experiment with a couple of modem i had laying around but without success. Pots and modem aren't really something a know a lot of, (that's the reason of the plan B, a lot simpler and something i understand) I also look into ATA to modem and i will probably use that for the device i cannot connect via serial, but it seem that a lot of them don't support the pcm codec (or at least i didn't found info about it), i never used one so my knowledge about them is limited, but the article should help me. also they will stay in a dedicated network so congestion shouldn't be a problem. Thank you a lot!

toast0 8y ago
rs232 is simple singalling with high and low voltages and a ground pin. Ethernet is differential signalling with no ground. That makes ethernet less susceptible to ground loop issues, and interference issues from long distances. I think it's just something to be aware of, and you likely won't have to do much to adress. But don't plan for running an rs232 to your neighbor's house without isolation. Many modems (notably Dreamcast modems) require line voltage to work. A normal POTS line provides a good amount of DC voltage when the line is off hook for various reasons, and a modem may use that for powering parts of itself or as a check to confirm it's properly connected. Something like this could help supply that voltage for picky modems http://dreamcast.onlineconsoles.com/phpBB2/guides_pcdcwin98.php#10 http://dreamcast.onlineconsoles.com/phpBB2/guides_pcdcwin98.... Many modems will also default to waiting for a dial tone before dialing, but that should be configurable via the dialstring. As with all things Telco, the terminology is strange. You're looking for the g.711 codec. It's basically what was used for T1s, so it's just right to fit a modem, because actually most ISPs were receiving calls via T1 --- that's how 56k works.

toast0 8y ago

rs232 is simple singalling with high and low voltages and a ground pin. Ethernet is differential signalling with no ground. That makes ethernet less susceptible to ground loop issues, and interference issues from long distances. I think it's just something to be aware of, and you likely won't have to do much to adress. But don't plan for running an rs232 to your neighbor's house without isolation. Many modems (notably Dreamcast modems) require line voltage to work. A normal POTS line provides a good amount of DC voltage when the line is off hook for various reasons, and a modem may use that for powering parts of itself or as a check to confirm it's properly connected. Something like this could help supply that voltage for picky modems http://dreamcast.onlineconsoles.com/phpBB2/guides_pcdcwin98.php#10 http://dreamcast.onlineconsoles.com/phpBB2/guides_pcdcwin98.... Many modems will also default to waiting for a dial tone before dialing, but that should be configurable via the dialstring. As with all things Telco, the terminology is strange. You're looking for the g.711 codec. It's basically what was used for T1s, so it's just right to fit a modem, because actually most ISPs were receiving calls via T1 --- that's how 56k works.