標準號：SIS SS-ISO 9549-1990
中文標準名稱：信息技術．平衡互換電路的電隔離
英文標準名稱：Information technology — Galvanic isolation of balanced interchange circuits
發布日期：1990/12/5 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1 This International Standard specifies galvanic isolation of balanced interchange circuits using optocoupler integrated circuit technology and is provided for data transmission in the two-condition code (e.g NRZ).The electrical characteristics are compatible with both ISO 8482 and CCITT Recommendation V.11.NOTE - Compatible means to allow interoperation with devices having interchange circuits conforming to the electrical characteristics specified in the referenced standards.Annex A shows interoperation with CCITT Recommendation V. 11 interchange circuits in a point-to-point environment.2 The specifications are given in terms of parameters and measurements for an isolated generator and an isolated receiver. These components may be used in twisted pair 2-wire or 4-wire point-to-point connections up to 1 000 m or multipoint connections up to 500 m for speeds up to 2 Mbit/s for point-to-point connections and 1 Mbit/s for multipoint connections. For data signalling rates up to 20 kbit/s, device manufacturers may optimize their component design.3 Options are provided to meet special application requirements, such as- isolated generator high impedance control;- isolated receiver circuit failure detection capability;- line termination in point-to-point configuration.4 This International Standard does not describe a complete equipment interface in terms of mechanical, electrical and functional /procedural specifications.