THE BANDWIDTH PROBLEM AT THE LOCAL LOOP
If I had to cite the biggest problem in deploying high-quality VoIP applications, along with data and video to the masses (the general consumer), it would be the limited bandwidth on the local loop. Because of this problem, we spend time on it in this chapter.
For today's analog voice transport systems, the present structure on the local loop provides adequate capacity, but that capacity is insufficient for other applications, such as data and video. Voice has a modest bandwidth requirement, about 3.5 kHz of the frequency spectrum. The local loop (the distribution plant) is designed to support voice bandwidths.
The problem is that many applications that are now in the marketplace, or are being developed, ...
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