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International standard ISO/IEC 11801 ''Information technology — Generic cabling for customer premises'' specifies general-purpose telecommunication cabling systems (structured cabling) that are suitable for a wide range of applications (analog and ISDN telephony, various data communication standards, building control systems, factory automation). It covers both balanced copper cabling and optical fibre cabling. The standard was designed for use within commercial premises that may consist of either a single building or of multiple buildings on a campus. It was optimized for premises that span up to 3 km, up to 1 km² office space, with between 50 and 50,000 persons, but can also be applied for installations outside this range. A major revision, Edition 3, is being prepared which will unify requirements for commercial, home and industrial networks. ==Classes and categories== The standard defines several link/channel classes and cabling categories of twisted-pair copper interconnects, which differ in the maximum frequency for which a certain channel performance is required: * Class A: link/channel up to 100 kHz using Category 1 cable/connectors * Class B: link/channel up to 1 MHz using Category 2 cable/connectors * Class C: link/channel up to 16 MHz using Category 3 cable/connectors * Class D: link/channel up to 100 MHz using Category 5e cable/connectors * Class E: link/channel up to 250 MHz using Category 6 cable/connectors * Class EA: link/channel up to 500 MHz using Category 6A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.) * Class F: link/channel up to 600 MHz using Category 7 cable/connectors * Class FA: link/channel up to 1000 MHz using Category 7A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.) * Class I: link/channel up to between 1600 MHz and 2000 MHz using Category 8.1 cable/connectors (specification under development) * Class II: link/channel up to between 1600 MHz and 2000 MHz using Category 8.2 cable/connectors (specification under development) The standard link impedance is 100 Ω. (The older 1995 version of the standard also permitted 120 Ω and 150 Ω in Classes A−C, but this was removed from the 2002 edition.) The standard defines several classes of optical fiber interconnect: * OM1: Multimode fiber type 62.5 µm core; minimum modal bandwidth of 200 MHz·km at 850 nm * OM2: Multimode fiber type 50 µm core; minimum modal bandwidth of 500 MHz·km at 850 nm * OM3: Multimode fiber type 50 µm core; minimum modal bandwidth of 2000 MHz·km at 850 nm * OM4: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm * OS1: Single-mode fiber type 1 db/km attenuation * OS2: Single-mode fiber type 0.4 db/km attenuation 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ISO/IEC 11801」の詳細全文を読む スポンサード リンク
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