mccoy@cbnewse.att.com (earl.mccoy) (05/16/91)
I have followed the interesting discussion concerning V.32 and V.42 modems. Does anyone have details about having a PC modem make an ordinary (non-ISDN) telephone call to a public X.25 network access point and then having an X.25 call setup procedure establish an X.25 session to an X.25 host? The usual async call to an X.25 PAD does not interest me. What PC software/hardware/modem is needed? Thanks in advance. Earl McCoy.
tnixon@hayes.uucp (05/16/91)
In article <1991May15.185048.14878@cbnewse.att.com>, mccoy@cbnewse.att.com (earl.mccoy) writes: > I have followed the interesting discussion concerning V.32 and V.42 modems. > Does anyone have details about having a PC modem make an ordinary > (non-ISDN) telephone call to a public X.25 network access point and > then having an X.25 call setup procedure establish an X.25 session > to an X.25 host? The usual async call to an X.25 PAD does not interest > me. What PC software/hardware/modem is needed? Thanks in advance. Well, there's a couple of different ways to do this. You can either buy a modem that has X.25 built in (like many of the Hayes V-series modems, including Ultra 96). You can either use standard async comm software to do one session at a time, or use AutoStream-compatible software to support up to four simultaneous remote sessions. The modem in this case includes a four-channel X.3/X.28/X.29 PAD function. A second option is to have a modem that supports synchronous communications (all Hayes Smartmodems 2400bps and above, and many from other manufacturers), and an SDLC/HDLC card in your PC. Then, you can use X.25 software. Sorry, I don't have any good suggestions for the software. A third option is to have a modem that supports the Hayes AutoSync feature (again, all Hayes Smartmodems 2400bps and above). AutoSync performs async-to-sync conversion inside the modem, allowing you to communicate with remote synchronous devices through the async port of your PC. You avoid having to buy an SDLC/HDLC card for your PC, but you need to find X.25 software that is AutoSync-compatible (there is at least one such program; let me know if you're interested, and I can find out about it for you). A fourth option is an "X.25 card" for your PC. These are available from companies such as Eicon and Winterhalter, but are generally pretty expensive. They often come with hardware and/or software features that allow the link to be shared with other PCs across some kind of bus or a LAN. Some have built-on modems, and others require an external synchronous modem. So, there are a lot of choices for connecting a PC to a PSPDN as a packet-mode terminal -- which is best for you depends on your application and the amount of money you have to spend. -- Toby Nixon, Principal Engineer | Voice +1-404-840-9200 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net