What are the types of modems?

Answer

There are lots of types of modems. Modem stands for MOdulator/DEModulator. A cable modem really is a modem because it modulates and demodulates RF on coax cabling. a phone modem does this using audible tones over a copper pair.

Answer

A V.32 modem supports 9600 baud data communications. It is unlikely that any of these are still for sale, but many are still in use at companies. IBM got into a lot of trouble at the Olympics in Atlanta when foreign news organizations came with modems that could only do 9600 baud to a system that expected a higher rate of data transfer. A V.32 bis modem supports 14,400 baud data communications. This is a good solid middle of the road standard unit. Data compression and error recovery typically use V.42 bis protocol. A V.34 is the latest standard. It supports communications at 28,800 baud. Vendors spent the last few months developing and testing hardware. Now volume production has begun and these units are beginning to appear in stores. Expect pricing around $250. Some modems run a bit faster than 28,800. There is no standard here, so you have to buy the same type of modem at both ends of the connection. Otherwise, they will fall back to the V.34 standard. Though not strictly a modem, an ISDN adapter can be used with ISDN digital phone service if it is offered by the local phone company. This can provide support speeds of 64000 bits per second. More will be said about this option later on.

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