By Robert E. Collin
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Extra resources for Antennas and Radiowave Propagation (Mcgraw Hill Series in Electrical and Computer Engineering)
1 Satellite Systems Commercial, two-way data transmission between mobile terminals and satellites began in 1988. While there have been costly failures in the intervening decade, at the close of 1998 there was one outstanding success, Qualcomms OmniTRACS. There were also several contenders, including AMSC and Norcom. The coming of low earth-orbiting satellites (LEOS), covered in Chapter 6, is certain to raise the level of activity in this area. Current satellite systems are distinguished by their unique coverage capability, which embraces all of the nonmetropolitan areas of the United States.
But packet switching carries relatively high unit overhead; it certainly requires both processing power and buffer storage resources at every node in the network, including the subscriber unit. The economic trade-off is easy to state but hard to calculate: 18 DATA NETWORK TYPES 1. If lines (including cellular) are cheap, use circuit switching. 2. If computing (includes devices) is cheap, use packet switching. It is not surprising that Europe led the way in packet switching because of its historically punitive communication tariffs.
There are techniques for suppressing graphic information, of course, but that is often exactly what is desired. In that case, a circuit switched solution is called for. The purest form of nontextual, graphic information is the facsimile. Data-only systems cannot handle a facsimile in the form of a pictorial representation of a piece of paper. However, it is possible to send a text message from a device to a facsimile machine. In general, with current technology, the longer the message length, the more that traffic is suited for circuit switched solutions.
Antennas and Radiowave Propagation (Mcgraw Hill Series in Electrical and Computer Engineering) by Robert E. Collin