ASR-33 Data Format?

Hans wrote: No, both 56K and 64K ISDN B channels are available in most of the US. But we were talking about using a 56K voice-band modem (V.90, X2, or K56flex) on a POTS line. The server end uses ISDN. The data rate on the POTS line is limited to 53 Kbps by FCC regulations. The signalling on the POTS line is 8000 baud with up to 7 bits per symbol. At the server end, the data is still 8000 samples per second, of 7 bits each. However, those samples are presented digitally, so in some sense it could be considered to be 56000 baud at the server end *only*. On the other hand, to be decoded properly, the modulation technique is such that the integrity of the byte framing of the samples must be maintained, so effectively it really is still 8000 baud. Yes, but the topic was 56K voice-band modems, which have not existed that long. Eric