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One of the most important words in telecommunications is virtual. It is used in a variety of ways, but in reality only has one meaning. If you see the word virtual associated with a technology or product, you should immediately say to yourself, it s a lie. A 56-Kbps modem is a good example of a virtual technology. These devices have attracted a great deal of interest since they were introduced a few years ago. Under certain circumstances, they do offer higher access speeds designed to satisfy the increasing demands of bandwidth-hungry applications and increasingly graphics-oriented Web pages. The problem they present is that they do not really provide true 56K access, even under the best of circumstances. 56K modems provide asymmetric bandwidth, with 56 Kbps delivered downstream toward the customer (sometimes) and significantly less
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bandwidth (33.6 Kbps) in the upstream direction. Although this may seem odd, it makes sense given the requirements of most applications today that require modem access. A Web session, for example, requires very little bandwidth in the upstream direction to request that a page be downloaded. The page itself, however, may require significantly more, since it may be replete with text, graphics, Java applets, and even small video clips. Since the majority of modem access today is for Internet surfing, asymmetric access is adequate for most users. The limitations of 56K modems stem from a number of factors. One of them is the fact that under current FCC regulations (specifically Part 68), line voltage supplied to a communications facility is limited such that the maximum achievable bandwidth is 53 Kbps in the downstream direction. Another limitation is that these devices require that only a single analog-to-digital conversion occur between the two end points of the circuit. This typically occurs on the downstream side of the circuit and usually at the interface point where the local loop leaves the central office (CO). Consequently, downstream traffic is less susceptible to the noise created during the analog-to-digital conversion process, while the upstream channel is affected by it and is therefore limited in terms of the maximum bandwidth it can provide. In effect, 56K modems, in order to achieve their maximum bandwidth, require that one end of the circuit, typically the CO end, be digital. The good news with regard to 56K modems is that even in situations where the 56Kbps speed is not achievable, the modem will fall back to whatever maximum speed it can fulfill. Furthermore, no premises wiring changes are required, and because this device is really nothing more than a faster modem, the average customer is comfortable with migration to the new technology. This is certainly demonstrated by sales volume. As was mentioned before, most PCs today are automatically shipped with a 56K modem.
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ISDN has been the proverbial technological roller coaster since its arrival as a concept in the late 1960s. Often described as the technology that took 15 years to become an overnight success, ISDN s level of success has been all over the map. Internationally, it has enjoyed significant uptake as a true, digital local loop technology. In the United States, however, because of competing and often incompatible hardware implementations, high
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cost, and spotty availability, its deployment has been erratic at best. In market areas where providers have made it available at reasonable prices, it has been quite successful. Furthermore, it is experiencing something of a renaissance today because of DSL s failure to capture the market. ISDN is tested, well understood, available, and fully functional. It can offer 128 Kbps of bandwidth right now, whereas DSL s capability to do so is less certain. More on DSL later.
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