Path: utzoo!attcan!uunet!steinmetz!davidsen From: davidsen@steinmetz.ge.com (William E. Davidsen Jr) Newsgroups: comp.dcom.modems Subject: Re: Are MNP modems noiser than non-MNP (also want rec. for some) Keywords: MNP line noise want recommendations Message-ID: <11535@steinmetz.ge.com> Date: 15 Jul 88 13:39:52 GMT References: <636@drexel.UUCP> Reply-To: davidsen@crdos1.UUCP (bill davidsen) Organization: General Electric CRD, Schenectady, NY Lines: 38 In article <636@drexel.UUCP> jeff@drexel.UUCP (Jeff White) writes: | 1. Are all MNP modes pretty inferior in performance and noise rejections when | operating in non-MNP mode, or was the one modem I worked on just a bad | example (a lemon)? No. I don't know if you have a bad brand or a bad example, but not all modems with MNP have noise problems. | 2. Any recommendations for 300/1200/2400 baud modems which are reasonably | priced and have MNP (or, can be upgraded to it at a later date at a | reasonable cost)? We have hundreds of MultiTech 224E guys. All have MNP, most class three, a few class five. We're still buying them, and have been very happy. There is a problem in calling a non-MNP modem if you don't turn off the "auto-MNP" feature. When the modems have established carrier and baudrate, the MNP (calling) modem will send a tone burst which means "would you like to play MNP with me?" If the system you're calling has a login sequence, such as UNIX (and most BBSs), this can mess up the login sequence or cause a false baudrate. The simple soultion to this is to run the line from the computer to the modem at a fixed speed, like 4800, and let the modem do the flow control. That's not always possible, I realize. MNP does more for interactive use than for file transfer (I'm going to hear about that one) because file transfer protocols will reject bad packets while you can't reject a stream of bad characters on a screen, or use a system when it's getting a bunch of noise characters. Hope this helps, I'm sure thatre will be other opinions. -- bill davidsen (wedu@ge-crd.arpa) {uunet | philabs | seismo}!steinmetz!crdos1!davidsen "Stupidity, like virtue, is its own reward" -me