Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!SIMTEL20.ARPA!W8SDZ From: W8SDZ@SIMTEL20.ARPA.UUCP Newsgroups: comp.dcom.modems Subject: 9600 bps dialups Message-ID: Date: Mon, 1-Jun-87 23:32:00 EDT Article-I.D.: SIMTEL20.KPETERSEN.12307175225.BABYL Posted: Mon Jun 1 23:32:00 1987 Date-Received: Thu, 4-Jun-87 06:12:51 EDT Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 32 The US Robotics HST 9600 modem is indeed full duplex. It uses a return channel of 300 baud, which is plenty fast enough for hand typing from a terminal. The modem runs at a fixed speed on the RS232 line so the switching between 300 and 9600 is transparent to your terminal. The end with the most data to send gets the 9600, the other 300. The negotiation between modems is fast and changes dynamicly. I recently installed an HST modem on my Remote CP/M bulletin board system. It is quite impressive in it's performance, handling both interactive terminal sessions and XMODEM file transfers (using the YMODEM 1k block size protocol). Those who predicted that the 300 baud return channel would be unusable for data, claiming it would be used only by the modem for MNP ack/nak's, were wrong! I am very impressed by the USR HST 9600 and would not hesitate to recommend it to anyone. I use one here at home to communicate with my RCP/M which is located in the computer club President's home about 5 miles away. We have received long distance calls from several other SysOps around the country who also have the HST. There have been no problems with any of the calls. It wouldn't surprise me if the HST becomes the defacto standard for 9600 bps. It beats those pseudo full duplex (really half duplex) modems. --Keith Petersen Arpa: W8SDZ@SIMTEL20.ARPA Uucp: {bellcore,decwrl,harvard,lll-crg,ucbvax,uw-beaver}!simtel20.arpa!w8sdz GEnie: W8SDZ RCP/M Royal Oak: 313-759-6569 - 300, 1200, 2400 (V.22bis) or 9600 (USR HST)