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FLAT   CABLES
COMPUTER  COOLING  SYSTEMS - 14100_54

Fire Controlman Volume 03-Digital Data Systems
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Figure  2-34.—Twisted  component  or  multiconductor  cable. TWISTED   COMPONENT   OR   MULTI- CONDUCTOR CABLES.  —Twisted component cables  consist  of  multi-insulated  wires  (solid  or stranded), with up to 120 conductors. They can be single wires or twisted pairs. The cable is concentric in shape and the larger cables are usually semi-rigid to provide support and put less strain on the cable itself and its connector (fig. 2-34). Depending on the length of  the  cable,  popular  cable  types  for  large  main- frames   and   minis   include   2U/2UW/LS2U   or 2AU/2WAU/LS2AU.   The   construction   and   a description can be found in NEETS, Module 19, The Technician's Handbook.  Twisted  component  cables can  be  terminated  with  rectangular  multipin  connectors or circular multipin connectors. They can be used for parallel and serial data transfer and in all types of computers. COAXIAL  CABLES.  —Coaxial  cables  are designed to transmit signals efficiently between 1 kHz and 4000 MHZ with minimum loss and little or no distortion. A coaxial cable is made of a central signal conductor covered with an insulating material (the dielectric core), which in turn, is covered by an outer tubular conductor (the return path). The cable is called coaxial because the conductors, usually two or three, are separated by the dielectric core. The inner core can be solid or stranded wire that is bare, timed, or silver coated. Coaxial cables always have an outer shielding; refer to MIL-C-17 for specifications. Commonly used coaxial cables include RG-12A, RG-58, and RG-59 for coaxial and TRF-8 and TRF-58 for triaxial. Coaxial component  cables  are  terminated  with  circular  multipin connectors. Coaxial cables are used for serial transfer of data. Figure 2-35 shows examples of two types of coaxial cable: single and triaxial. FIBER  OPTIC  CABLES.  —Refer  to  NEETS, Module 24, Introduction to Fiber Optics, for a detailed discuss  of  the  fiber  optic  cabling.  Fiber  optic  cables  are used for serial transfer of data. CAUTION CARE   SHOULD   ALWAYS   BE EXERCISED   WHEN   HANDLING CABLES.   SEVERE   BENDING   AND HANDLING  OF  THE  CABLE  BY  ITS CONNECTOR CAN CAUSE DAMAGE. Figure 2-35.—Coaxia1 cable: A. Single; B. Triaxial. 2-25






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