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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 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. In fact, one application that has made its mark with ISDN is videoconferencing, which we ll discuss shortly.
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The typical non-ISDN local loop is analog. Voice traffic is carried from an analog telephone to the CO using a frequency-modulated carrier; once at the CO the signal is typically digitized for transport within the digital network cloud. On the one hand, this is good because it means that there is a digital component to the overall transmission path. On the other hand, the loop is still analog and, as a result, the true promise of an end-to-end digital circuit cannot be realized. The circuit is only as good as the weakest link in the chain, and the weakest link is clearly the analog local loop. In ISDN implementations, local-switch interfaces must be modified to support a digital local loop. Instead of using analog frequency modulation to represent voice or data traffic carried over the local loop, ISDN digitizes the traffic at the origination point, either in the voice set itself or in an adjunct device known as a terminal adapter (TA). The digital local loop then uses time-division multiplexing to create multiple channels over which the digital information is transported, which provide for a wide variety of truly integrated services.
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There are two well-known implementations of ISDN. The most common (and the one intended primarily for residence and small-business applications) is called the Basic Rate Interface, or BRI. In BRI, the two-wire local loop supports a pair of 64 Kbps digital channels known as B-Channels as well as a 16 Kbps D-Channel, which is primarily used
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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for signaling but can also be used by the customer for low-speed (up to 9.6 Kbps) packet data. The B-Channels can be used for voice and data, and in some implementations can be bonded together to create a single 128 Kbps channel for videoconferencing or other higher bandwidth applications. Figure 6-1 shows the layout of a typical ISDN BRI implementation. In this diagram, the LE is the local exchange, or switch. The NT1 is the network termination device that serves as the demarcation point between the customer and the service provider; among other things, it converts the two-wire local loop to a four-wire interface on the customer s premises. The TE1 (terminal equipment, type 1) is an ISDN-capable device such as an ISDN telephone. This simply means that the phone is a digital device and, therefore, is capable of performing the voice digitization itself. A TE2 (terminal equipment, type 2) is a non-ISDN-capable device, such as a POTS telephone. In the event that a TE2 is used, a TA must be inserted between the TE2 and the NT1 to perform analog-to-digital conversion and rate adaptation. The reference points mentioned earlier identify circuit components between the functional devices just described. The U reference point is the local loop; the S/T reference point sits between the NT1 and the TEs; the R reference point is found between the TA and the TE2.
BRI Applications
While BRI does not offer the stunning bandwidth that other more recent technologies (such as DSL) do, its bondable 64 Kbps channels provide reasonable capacity for many applications. The two most common today are remote LAN and Internet access. For the typical remote worker the bandwidth available through BRI is more than adequate, and new video compression technology even puts reasonable quality videocon-
Figure 6-1 The ISDN Basic Rate Interface (BRI)
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