On Fri, Dec 01, 2000 at 06:29:06AM -0800, Edward Comer wrote: My mistake - I meant 720 Bytes per second, or 7200 bits per second. I started to type baud, then thought bytes then forgot to clarify the BPS. This is a raw rate, compression varies too much. Since there is only 30khz of bandwidth in each channel 28800 is the maximum theoretical limit. I think the RAM pager network that Palm uses is also 7.2k. Omnisky is 19.2k, though I've rarely seen it at 12k in operation. And thanks for the initialization strings. > Tom Zerucha's earlier statement "Analog Cellular is > bandwidth limited so if you get 720 bps you are doing > good." is incorrect. I worked for a major RBOC > cellular carrier for 16 years and was responsible for > cellular data planning and engineering and I assure > you that analog cellular will out perform any current > digital cellular connection for speed and coverage. > Analog cellular voice channels reliably support > 4800bps without compression and with compression > 14.4bps. In strong signal situations, speeds can be > considerably higher. Use of an ordinary modem with > MNP5 to 10 compression will obtain the higher speeds. > The loss of carrier during cell handoffs is easily > handled by setting the S10 register of the modems on > both ends with ATS10=100. > > Recommended init string for various land line modems > are: > For US Robotics / 3 Com modems: > ATS10=200&A3&B1&N2&U2&W&W1 <CR> > For Rockwell chip set based land-line modems 33600 and > lower: AT%E2\N2S7=60S10=200+MS=11,1,1200,4800&w&w1 > <CR> > For most other brands: ATN0S37=6S10=200&w&w1 <CR> > For Rockwell chip set based land-line modems 56K V90 > models: > AT%E2\N2S10=200S7=60+MS=V34,1,1200,2400,1200,2400 <CR> -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/tech/support/forums/
