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One of the more interesting parts of the ISDN service is the solution to the local loop problem Remember our local loop is ancient and designed for voice From Figures 9-1 and 9-2 , we expect it to support 192 KB/s bidirectionally! This would not be a problem if we only had to go a few hundred feet Unfortunately, there aren t that many customers within a few hundred feet of the central office The problem is approached from the other end actually If we want to reach 95 percent of the customers, what is the average length of the cable to them and what are the quality and characteristics of that cable Some of the answers to these questions you might find surprising In cities, 95 percent of the customers are within 15,000 cable feet of the central office When we go to suburbs and the rural areas in particular, then all bets are off Figure 9-4 shows a typical local loop layout with emphasis on the fact that local loops, particularly those in older parts of a city, are comprised of different gauges of cable and may have several bridge taps Although slightly exaggerated, one could imagine that all of the cable taps are on one pair That is, at one time or another during the 60-year life of this particular cable plant, that pair was used to provide telephone service to each of those different locations Note also the gauge change from 24- to 19-gauge This was obviously not a problem for the analog telephone network, because it worked fine for 60 years on that cable

Once the views are published to PAS, users are free to view the book and the views inside it, as long as they have the proper permissions If the user publishing the book has enough authority, they can choose to manage the book and set permissions as to which roles can see the book and which cannot For the purpose of this narrative, the user will have access to the book, so it is time to analyze the data using the thin, or Standard, client of PAS

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Figure 9-4: Typical local loop layout High-speed digital transmission presents a whole new set of problems We will outline just the issues here (See 16 , xDSL, for a more in-depth discussion of the transmission problems) The fundamental problem centers on the fact that a wire is an antenna This is OK if we are in the radio or TV transmission business, but it is an unfortunate side effect of the telephone transmission business The problem is worse at higher frequencies that characterize digital signals If we use our local loop to send digital

4QD controllers ship as open printed circuit board assemblies, so the end user will have to make his own housing and mounting arrangement to keep the 4QD board isolated from impact shocks and protected from debris The 4QD controller is physically much larger than the Victor and the smaller Vantec controllers, and is generally used in weight classes of 100 pounds and greater It does offer great reliability, built-in automatic current limiting, and a better power-to-cost ratio than other variable speed controllers The downside of the 4QD boards is that they are not compatible with hobby radio gear The 4QD board has a purely analog input logic, and it is designed to directly connect to analog throttle and direction control signals Getting a 4QD board to talk to traditional R/C units is the biggest challenge in successfully implementing this design One method to generate an analog signal is to connect a potentiometer to the output shaft of an R/C servo Feed 5 volts through the potentiometer to the 4QD controller, and then drive the servo with the regular R/C transmitter set Although this works, it is not recommended because it adds more parts that can become damaged during a combat match The ideal way to generate the analog voltage is to use a microcontroller to read in the transmitter s signals and convert them into an analog signal to drive the 4QD controllers Getting the signal conversion just right is a challenging task if the builder wants consistent and reliable control out of his 4QD board The 4QD boards offer a lot of power for the price, but the difference between smooth control and spastic twitching can take a lot of control-system troubleshooting

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