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| sesen Tl Posts: 1 Ethiopia | Posted - 6/15/2005 12:55:14 PM    im working on a project to connect two computers that are near to each other ,and i am using external modem to connect.When i read some resources it will be possible if I using null modems.Can it be possible to communicate them with the external modem. please answer me ,i'm in stack! thankyou! |
| v.Richard Tl Posts: 6222 USA | Posted - 6/17/2005 7:16:59 PM  Null modem generally refers to device that goes between 2 serial ports (the cable from computer->modem) and aren't needed if you intend to use a phone line between the 2 modems. The challenge becomes to get the 2 modems to establish a connection on the dry phone line (no switch/dial tone/ring voltage). It's also necessary to use modem that does not have a line-powered DAA (if you hear a 'click' when the modem goes off-hook, you are on the right track). It is necessary to have 1 modem answer (ATA) while the other is told to go online (ATO). Aloha! Richard. |
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