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The physical impairments that can have an impact on the performance of a newly deployed DSL circuit tend to be characteristics of the voice network that typically have a minimal effect on simple voice and lowspeed data services. These include load coils, bridged taps, splices, mixed gauge loops, and weather conditions.
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We have already mentioned the problems that load coils can cause for digital transmission; because they limit the frequency range that is
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allowable across a local loop, they can seriously impair transmission. Bridged taps are equally problematic. When a multipair telephone cable is installed in a newly built-up area, it is generally some time before the assignment of each pair to a home or business is actually made. To simplify the process of installation when the time comes, the cable s wire pairs are periodically terminated in terminal boxes (sometimes called B-boxes) installed every block or so. As we discussed in 3, Telephony, there may be multiple appearances of each pair on a city street, waiting for assignment to a customer. When the time comes to assign a particular pair, the installation technician will simply go to the terminal box where that customer s drop appears and cross-connect the loop to the appearance of the cable pair (a set of lugs) to which that customer has been assigned. This eliminates the need for the timeconsuming process of splicing the customer directly into the actual cable. Unfortunately, this efficiency process also creates a problem. Although the customer s service has been installed in record time, each of the terminal boxes along the street contain unterminated appearances of the customer s cable pair. These so-called bridged taps present no problem for analog voice, yet they can be a catastrophic source of noise due to signal reflections that occur at the copper-air interface of each bridged tap. If DSL is to be deployed over the loop, the bridged taps must be removed. Although the specifications indicate that bridged taps do not cause problems for DSL, actual deployment says otherwise. To achieve the bandwidth that DSL promises, the taps must be terminated.
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Splices can result in service impairments due to cold solder joints, corrosion, or weakening effects caused by the repeated bending of wind-driven aerial cable. Gauge changes tend to have the same effects that plague circuits with unterminated bridged taps. When a signal traveling down a wire of one gauge jumps to a piece of wire of another gauge, the signal is reflected, resulting in an impairment known as an intersymbol interference. The use of multiple gauges is common in a loop deployment strategy because it enables outside plant engineers to use lower-cost small gauge wire where appropriate, cross-connecting it to larger-gauge, lower-resistance wire where necessary.
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Weather
Weather is perhaps a bit of a misnomer; the real issue is moisture. One of the greatest challenges facing DSL deployment is the age of the outside plant. Much of the older distribution cable uses inadequate insulation between the conductors (paper in some cases). In some instances, the outer sheath has cracked, allowing moisture to seep into the cable itself. The moisture causes crosstalk between wire pairs that can last until the water evaporates. Unfortunately, this can take a considerable amount of time and result in extended outages.
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