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Construction practices and construction equipment have de nitely improved since the early days of cable television systems The method for servicing an aerial plant used to be climbing the poles with a set of hooks and a belt Most people learned to climb poles from earlier experiences working for either the telephone or electric company Some learned to climb from a tour in the service, usually the US Army Signal Corps The Signal Corps adopted telephone company methods and speci cations Former Signal Corps veterans often became employed by cable television companies and learned the technical side during the early
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Dual (in/out) institutional system Institutional system can use standard television carriers for service
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Figure 2-15 Institutional cable system overlaid on subscriber cable system
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start-up years Those that did not climb often used extension ladders against the poles Some innovative cable system technicians experimented with vehiclemounted ladders In a short time, the hydraulic lift truck became available and soon became affordable and practical for cable television system use As suburban areas grew and became more populated, underground utilities, including cable television systems, became more attractive Many system operators felt their plant was safely underground and at ground level for easy maintenance Smaller and more affordable trenching machines made such installation nancially viable 2231 Aerial construction methods have de nitely undergone evolutionary changes From a labor-intensive manual operation to modern hydraulically operated lift trucks with hydraulically operated drills, saws, and hoists, present-day construction practices have drastically improved Some old-timers remember climbing the poles and boring through a pole with a bit brace and ship s auger Nowadays a person is lifted up the pole in an aerial basket The pole is drilled in about a minute and the through-bolt washers and nut are installed in another minute, enabling many more poles to be framed in a day Such ef ciency did not result in many cost reductions because of higher costs for equipment and more experienced operators, but a lot more plants could be built in a shorter time frame Pole-line hardware also improved over the years and more attention was paid to the effects of dissimilar metals on corrosion Therefore, better materials were introduced Usage of corrosion-resistant materials such as a Monel metal, stainless steel, and a variety of plastics produced a more reliable cable plant 2232 Underground cable plant construction in both methods and materials has changed more than aerial plant First, the method of placing the plant underground has certainly progressed from pick and shovel methodology Opening a trench has changed from a backhoe machine to a chain-type trencher that opens a narrow trench, spilling the removed earth into a neat row along one side of the trench Usually stones are manually removed and a layer of gravel is placed in the bottom of the trench A trench of this variety can be used with direct burial cable Often PVC-rigid conduit is placed in the trench with an installed pull-rope to facilitate pulling the communication cable through at some later time Semi exible conduit is placed in the trench; some manufacturers provide the conduit with the cable already installed Several conduits can often be placed in the same trench Many trenchers also have an optional back ll
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blade that can plow the spill back into the trench Trenching machines can provide trenches from very shallow to several feet deep For most communication purposes, a depth of 24 to 30 inches is appropriate A favorite method of placing cable underground is using a cable plow As mentioned in 1, the two types of cable plows are the vibratory plow and the stationary plow Because an underground plant requires access to the active and passive devices, a variety of equipment enclosures are designed for underground plant servicing These enclosures fall into two categories: above ground and underground The aboveground enclosures are either metal or plastic pedestals, and the underground enclosures are either plastic or concrete vaults The vaults are usually tted with an appropriate cover that has to be either pried open with a special tool or unbolted with a special wrench The aboveground pedestals have either a locking device or special tool These measures prevent unauthorized tampering with the equipment More progressive cable operators have electronic monitoring capabilities, called status monitoring, which can integrate an alarm system for vault or pedestal protection Some of these pedestals and vaults are shown in Figure 2-16
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