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Asymmetry of color and structure Sharp border demarcation (black arrows) Milia-like cysts (white arrows) Pigmented pseudofollicular openings (yellow arrows) Nonpigmented pseudofollicular openings (blue arrows) Pigmented crypt (red arrows)

speci ed procedures in connecting the system. Technicians and engineers were usually fresh out of the armed services. Engineers who graduated from engineering schools were taught electronics as radio technology and engineering as power systems. Writings from telephone company sources such as AT&T/ Bell Labs produced early theory on cascaded ampli ers. With such little information to go on, it was the resourcefulness and determination of the early system technicians and engineers that caused the industry to grow into what it is today. For many of us, our rst systems were essentially classic cable systems that provided vastly improved broadcast television to our subscribers. 1.122 Most early classic systems simply consisted of a cascade of ampli ers connected together by sections of 75-ohm cable. Connectors were the kind used for that type of cable with the matching connectors on the ampli er housing. Matching networks were used to connect subscribers via a drop cable. The matching network tapped a signal off the main cable, feeding signal to the connecting drop cable. Ampli ers were usually either homebuilt or whatever was available on the newly formed master antenna television (MATV) industry. Power for these rst ampli er types was often 110 volts alternating current (v.a.c.), thus requiring the power company to provide a power source. There was de nitely a safety hazard to technical personnel working on these start-up systems. The attenuation of the cable was not as good as the cable used today. Since the loss was much less at the low VHF bands, the upper VHF channels and any UHF channels were converted to the low VHF band of channel 2 through 6. This technique allowed more distance between ampli ers and thus provided more reach for the system. Many early systems were essentially single-cable, ve-channel systems that enabled the start-up of the cable television industry. 1.123 The braided-type cable gave many system operators a lot of trouble, mostly with water ingress. Of course early systems leaked signal, but it was not a large problem since the signal leakage was on channel. Noise ingress and the accompanying impedance mismatch, and picture ghosting were much more of a problem with system signal levels. Clearly, better cable was needed and since the supply of government-surplus cable became scarce, cable manufacturers eager for new business made improved cable for the edgling industry. The solid-aluminum-sheathed, plastic-foam- lled cable ful lled the cable television industry s needs. Several sizes of cable with improved loss characteristics allowed cable systems to extend the aerial plant longer distances, serving more subscrib-