Cẩm nang dữ liệu không dây P16

DEVICE ALTERNATIVES COMBINATIONS AND PERMUTATIONS A bewildering array of subscriber unit options are available for wireless data ranging from fully integrated terminal/modem/radio units to multibox combinations of PCs, external modems, cellular transceivers, and portable faxes. A (too) simple representation of some of the terrestrial variations is illustrated in .igure 16-1. This convoluted collection of hardware alternatives is extraordinarily volatile.