BS 7112-1991 在传送自动数据处理信息的电信系统中开放式系统互连的物理层使用密码以获得互操作性和安全性程序

标准号：BS 7112-1991
中文标准名称：在传送自动数据处理信息的电信系统中开放式系统互连的物理层使用密码以获得互操作性和安全性程序
英文标准名称：Procedures for achievement of interoperability and security by use of encipherment at the physical layer of OSI in telecommunication systems conveying automatic data processing information
标准类型：L78
发布日期：1991/5/31 12:00:00
实施日期：1991/5/31 12:00:00
中国标准分类号：L78
国际标准分类号：35.040
适用范围：This International Standard applies to systems for encipherment of ADP information in the physical layer of data communications. This International Standard is equally applicable whether the Data Encipherment Equipment (DEE) is implemented as a physically separate piece of equipment or implemented as part of the Data Terminal Equipment (DTE) or as part of the Data Circuit terminating Equipment (DCE). When the encipherment is integrated into the DTE or DCE, this International Standard applies to those portions of the DTE or DCE design which implement the requirements of this International Standard. Interoperability requirements are defined for the following physical interface definitions: V.24, X.20 bis, X.21 bis, X.20, and X.21. The physical layer is described in the Open Systems Interconnection Reference Model, ISO 7498. In physical layer encipherment, all of the SDU is normally enciphered. The interoperability requirements described in this International Standard apply to both synchronous and asynchronous operation in both full duplex and half duplex modes. The main body of this International Standard specifies requirements which are applicable to the use of various encipherment algorithms. Annex B specifies additional requirements for the use of DEA (ANSI X3.92-1981). This International Standard also specifies two alternative modes of synchronous operation - the delayed option and the immediate option - which are mutually incompatible. This International Standard also specifies two alternative actions for BREAK signalling for asynchronous operation -Class A and Class B - which are mutually incompatibie.