hysical layers
rocess control engineering;Specification;Specification (approval);Transmission media【摘要】: This part of IEC 61158 specifies the requirements for fieldbus component parts. It alsospecifies the media and network configuration requirements necessary to ensure agreedlevels ofa) data integrity before data-link Layer error checking;b) interoperability between devices at the physical layer.The fieldbus physical layer conforms to layer 1 of the OSI 7-layer model as defined byISO 7498 with the exception that, for some types, frame delimiters are in the physical layerwhile for other types they are in the data-link Layer.【中国标准分类号】: M10;L79【国际标准分类号】: 25_040_40;35_100_10;35_240_50【页数】: 418P.;A4【正文语种】: 英语 | 欢迎光临 世界资料网论坛 (http://bbs.infoeach.com/) | Powered by Discuz! X2.5 |