By Robert Cole (auth.)
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Extra resources for Computer Communications
Furthermore computer manufacturers now use the V24 standard for connecting local terminals as well. This compatibility between equipment is very important in allowing various different types of equipment, from different manufacturers, to be interchangeable. Because the manufacturers in the United States dominate the computer industry the standards adopted by the United States often become the international standards of the CCITT. One of the US standards called RS232C is in fact the same as the V24 recommendation and preceded it.
1) To provide a synchronous connection using higher data rates ( 1200/2400, 4800, 9600 bps); but again a private circuit is needed for full duplex and full speed operation. 1) A very high data rate can be achieved, but at a higher cost, using base band signalling for part of the distance on a special circuit. 1) In terms of cost the acoustic coupler represents the cheapest modulation equipment. The cost then rises through the four types of MODEM described 36 Computer Communications above. The higher the data rate, the higher the cost; however, the relationship is not linear.
5. 1 above, is usually called multiplexing'; the situation in (2) as described by equation 4. 3 is usually called 'concentration'. 3 can only be implemented by equipment sharing a channel and co-operating over its use. Concentrators use storage to even out fluctuations in the actual transfer rates. Usage of these 47 Character Terminal Networks terms by various groups of people within the computer industry has led to some ambiguity in their meaning in the communications context. channel a. b. Frequency division multiplexing (FDM), and Time division multiplexing (TOM).