The English Electric Lightning : a comprehensive guide for by Richard J Caruana

By Richard J Caruana

Complete chronology of the categories improvement and operational use. photograph insurance of preserved examples. versions, squadrons, operators, creation. colour side-views. Scale fold out plans. inside art. equipment, sticker and accent directory

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It never existed in any version of the 568 Standard. Category 2 (not defined by ANSI/TIA/EIA-568-B) This cable type supports frequencies of up to 4MHz. It’s not commonly installed, except in installations that use twisted-pair ArcNet and Apple LocalTalk networks. Its requirements are based on the original, proprietary IBM Cabling System. It never existed in any version of the 568 Standard. Category 3 (recognized cable type in ANSI/TIA/EIA-568-B) This type of cable supports data rates up to 16MHz.

A plenum cable can substitute for all those below it. T A B L E 1 . 2: NEC Flame Ratings Optical Fiber Twisted Pair Coaxial Cable ArtiArticle 770 Article 800 cle 820 Common Term Notes OFNP1 OFCP2 CMP3 MPP4 CAVTP Plenum Most stringent rating. Must limit the spread of flame and the generation of visible smoke. Intended for use in HVAC (heating ventilation and air conditioning) plenum areas; can be substituted for all subsequent lesser ratings. OFNR CMR MPR CATVR Riser When placed vertically in a building riser shaft going from floor to floor, cable must not transmit flame between floors.

Because no cabling standards existed, an MIS director simply had to ask the vendor which cable type should be run for a specific type of host or terminal. Frequently, though, vendor-specific cabling caused problems due to lack of flexibility. Unfortunately, the legacy of early cabling still lingers in many places. PC LANs came on the scene in the mid-1980s; these systems usually consisted of thicknet cable, thinnet cable, or some combination of the two. These cabling systems were also limited to only certain types of hosts and network nodes.

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