Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a pair of legacy applications that connect to each other through a phone line by use of external serial modems. I want to replace the telephone line with an Internet connection. The objective is to have a hardware device on each end connected to the computer exactly as the modem was, with this device behaving just like a modem (AT commands, etc.). Preferably, the devices should establish a connection when the modem would dial and drop the connection when the modem would hang up, as opposed to being an "always on" connection.

Quick diagram:

PC ---[RS-232]--- device server --- Internet --- device server ---[RS-232]--- PC

I found a few products:

Both advertise a 'modem emulation' feature, which is what I want, but I thought I'd ask someone who may have used these devices in the past.

Will these devices accomplish what I have to do? Does anyone have any suggestions for other products designed for this kind of thing?

I sincerely thank everyone for the assistance.

share|improve this question
up vote 1 down vote accepted

EtherPath® SS-1R Single Port Serial Server "Ethernet Modem" by DCB (Data Comm For Business, Inc.)

I have experience with these in the field (hundereds) for 6+ years and not one has ever failed. We have not used their "EtherModem" mode but if the quality of that holds up like everything else in this device then it is worth a look.

I do not know or work for them, just a happy customer.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.