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>Is the much-talked-about new IBM PCMCIA modem likely to work on European >ISDN lines? well, I don't know about that particular modem, but I do know some stuff about ISDN. The American format is 2B1Q, which stands for 2-bit-1-quaternary. Basically, that means that they send two bits per symbol, and each symbol has 4 logic levels. Europe is (I think) 3B2T, which is 3-bits-2-ternary, i.e. they send three bits by sending 2 ternary logic symbols. So, in other words, since the American-standard and European-standard ISDN chipsets are not compatible, therefore the modems cannot be compatible. I don't think anybody has come out with a chipset to do both standards. --andy