Laserfiche WebLink
Building-Attached Facilities <br /> Building-attached facilities exist in all three technologies in two general forms: (1) roof-mounted, <br /> in which antennas are placed on the roofs of buildings, or (2) building-mounted, in which antennas <br /> are mounted to the sides of buildings. (Although not as common, facilities also can be mounted on <br /> other structures such as water tanks, billboards, church steeples, or other creative locations.) <br /> Figure 7 000 <br /> • BUILDING-ATTACHED FACILITIES BUILDING-MOUNTED <br /> ANTENNAS <br /> e <br /> 0 <br /> 0 <br /> ROOF-MOUNTED o <br /> ANTENNAS CrO <br /> *C1 CEO G <br /> Qm o <br /> o <br /> H <br /> Although the visibility of building-attached facilities varies, roof-mounted antennas are generally <br /> hidden from view because they are located in the middle of the roof or in boxed structures <br /> resembling air conditioning units. Likewise, building-mounted antennas are also unnoticeable if <br /> they are painted to match the color and texture of the building. Antennas that are architecturally <br /> integrated into a building are often referred to using the term "stealth." <br /> It is important to note that although building-attached facilities are becoming common, they can be <br /> used only when buildings meet the height required for antennas to function within the surrounding <br /> system. Where buildings do not meet height requirements,providers tend to use monopoles. <br /> How Cellular Mobile Telephone Technology Works <br /> As described previously, cellular systems are composed of interconnected neighboring "cell sites." <br /> These cell sites operate low power facilities (facilities that function on low amounts of electric <br /> energy). <br /> The cellular telephone industry is limited to 45 MHz of spectrum bandwidth, which without <br /> frequency-reuse, would limit each cellular carrier to 396 frequencies or voice channels. In order to <br /> increase calling capacity, these low power facilities "reuse" frequencies on the electromagnetic <br /> spectrum. The manner in which providers organize, or "configure," their cells is an important <br /> factor in increasing frequency reuse and establishing an area's calling capacity. <br /> 15 <br />