Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!daveb From: daveb@cbmvax.commodore.com (Dave Berezowski) Newsgroups: comp.sys.amiga.datacomm Subject: Re: Telebit vs. USR Message-ID: <18305@cbmvax.commodore.com> Date: 30 Jan 91 16:06:47 GMT References: <1991Jan15.021116.23778@athena.mit.edu> <1886cb88.ARN07ec@postmod.UUCP> Reply-To: daveb@cbmvax.commodore.com (Dave Berezowski) Organization: Commodore, West Chester, PA Lines: 55 In article ghost@bucsf.bu.edu (Jay Adelson) writes: > >Now here's a question for you: > > Let's say you're going to be dialing your College's computer UUCP site. > > The dialup modems are telebit t2500's, but the output to the terminals >on campus are 9600 max anyway, so really dialing up wouldn't go faster. > >Which modem would then be better: The Telebit, or the US Robitics? > >I'm assuming the v.32 is what you would use on dialup anyway...unless >I'm mistaken, so could EITHER really be BETTER? > >The reason I ask is I've heard the Telebit is supposed to be >better for uucp connects.\ > It all depends on the way the T2500 is configured. If it is configured properly then it should allow you to dial in with a V.32 modem with V.42 error detection/correction and V.42bis data compression which the new US Robotics Courier Dual Standard will do. Here are some excerpts from my T2500 configuration notes: ATX2S51=254S110=0S111=0S95=2S96=1S66=2S58=2S93=20S92=1 X2 - turn on result codes S51=254 - auto speed select on (autobaud) S110=0 - PEP spoofing off (may want to leave on for other PEP dial-in users) S111=0 - ditto S95=2 - auto reliable mode on (MNP Class 4 error correction) S96=1 - data compression on S66=2 - lock-in at 19,200 S58=2 - RTS/CTS flow control (optional) S93=20 - wait up to 2.0 seconds for V.32 link up (IMPORTANT!) S92=1 - issue PEP answer tones at end (so that V.42 can connect first) S7=90 - wait max. of 90 seconds for carrier detect Page 557 of the T2500 manual references the need to increase S93 when attempting to talk to a V.32 modem. Setting 'S92=1' is also very important; it gives V.32 modems a chance to negotiate a link up first. If the T2500 is NOT configured properly, you MAY NOT be able to connect at 9600 baud with a V.32 modem. In this case, you'll probably want to use another Telebit modem (with PEP) to dial up the system. I have successfully connected to a T2500 at 9600 baud with a UDS FasTalk modem which supports V.32/V.42/V.42bis. The trick was to increase the FasTalk's S7 register to 90 which tells it to wait a max. of 90 seconds for carrier detect (V.32 link up can take some time). Good luck. daveb -- David Berezowski {caip,ihnp4,allegra,seismo}!cbmvax!daveb