rick@seismo.CSS.GOV (Rick Adams) (10/14/87)
I have been doing some testing with the newest Telebit modems with the newest firmware (supports uucp protocols and LZ compression between modems). Note this is the new "gate-array" based hardware platform which has only been shiping for a few weeks. The results have been very impressive. Following is an excerpt from the log file of a few uucp sessions between uunet (in Washington DC) and telebit (in Cupertino, CA) over normal ATT long distance lines. Received data seems to be limited by the Systech board in the Sequent. We could never get it to take data faster than about 8500 bps. However, sending is another story... --rick p.s. note that the number is Characters per second, not Bits per second ordinary ascii text file with lots of repetition - LZ compression in modem telebit (10/13-16:32-8751) sent data 98718 bytes 60.63 secs 1628 cps /bin/csh - LZ compression in modem telebit (10/13-16:36-8837) sent data 73728 bytes 50.82 secs 1450 cps LZ compressed news batch - LZ compression in modem telebit (10/13-16:39-8915) sent data 50955 bytes 49.70 secs 1025 cps LZ compressed news batch - no compression in modem telebit (10/13-16:45-8984) sent data 50955 bytes 38.44 secs 1325 cps
pete@octopus.UUCP (Pete Holzmann) (10/14/87)
In article <44163@beno.seismo.CSS.GOV> rick@seismo.CSS.GOV (Rick Adams) writes: >I have been doing some testing with the newest Telebit modems with the >newest firmware (supports uucp protocols and LZ compression between modems). > >The results have been very impressive. >LZ compressed news batch - no compression in modem > telebit (10/13-16:45-8984) sent data 50955 bytes 38.44 secs 1325 cps We've been helping a group test the 3.0 modems (no LZ compression yet) on a *terrible* link between the USA and Quito, Ecuador. The line is so bad you can barely hear. The modems couldn't hear each other either until they added a small amplifier (20 dB!) to each end. This is normal dialup. Once the amps were added, the modems connect every time, all the time, getting 6300-6400 bit-per-sec throughput. I'd say this is easily a worst-case scenario. The only connection worse than this is trying to call Venezuela. Usually, you can't make the connection because the phone system down there can't put the call through. Unfortunately, Telebit hasn't solved *that* one yet! :-) Pete -- OOO __| ___ Peter Holzmann, Octopus Enterprises OOOOOOO___/ _______ USPS: 19611 La Mar Court, Cupertino, CA 95014 OOOOO \___/ UUCP: {hplabs!hpdsd,pyramid}!octopus!pete ___| \_____ Phone: 408/996I omp.