rmd@hpfcla.UUCP (02/18/84)
56K phone lines would seem to make feasible simultaneous voice and data. It wouldn't seem too hard to split the data stream into a 9600 async line and a low grade voice line. This would be great for working at home with a terminal while conversing with co-workers. What do you ATT people think? Feasible? Probable? Under development? Rick Dow inhp4!hpfcla!rmd
dmmartindale@watcgl.UUCP (Dave Martindale) (02/22/84)
56Kbps is what is currently used for digital transmission of ordinary-quality phone circuits. I'm not sure whether it's 8 bit samples at 7KHz or 7 bit samples at 8KHz. Regardless, you should be able to swipe one bit each sample for digital transmission, giving 7 or 8Kb synchronous concurrently with voice which isn't too much noisier. You'd lose some of that potential speed converting between synch and asynch.
julian@deepthot.UUCP (Julian Davies) (02/24/84)
Re the structure of 56Kbps lines. I gather that the basic line system is 64Kbps (plus the extra occasional sync bit occasionally) but every 8th bit is reserved for the Common Channel Signaling systems.