信息技术 开放系统互连 应用服务客体联系控制服务元素连接方式协议

[中文适用范围]： ACSE 支持两种通信模式：连接模式和无连接模式。 ACSE 服务定义（参见 ITU-T Rec. X.217 bis | ISO/IEC 15953）包括两种通信模式。 此建议|国际标准仅包括通信的连接方式。 此建议|无连接通信模式的国际标准包含在 ITU-T Rec. 中。 X.237之二| ISO/IEC 15955。 本建议书|国际标准定义了适用于希望在开放系统互连环境中以连接模式互连的系统之间的通信实例的过程。 此建议|国际标准包括用于建立和发布 ASO 关联的内核功能单元。 认证功能单元提供额外的设施来交换信息以支持关联建立期间的认证，而无需添加新的服务。 ACSE 身份验证工具可用于支持有限类别的身份验证方法。 ASO上下文协商功能单元为接收者提供附加设施以在关联建立期间从发起者提供的列表中选择ASO上下文。 可选的高级关联功能单元提供了识别 ASO 关联并透明地将数据传递给子 ASO 的功能，并允许在关联的生命周期内修改 ASO 上下文或 ASO 关联上的表示上下文。 此建议|国际标准规定： a) ASO 关联控制信息传输程序以及 ASO 和应用实体的认证； b) ACSE APDU 表示的抽象语法。 ACSE 过程是根据以下方面定义的： a) 通过使用表示服务或支持 ACSE 服务在对等 ACSE 协议机之间进行交互； b) ACSE 协议机与其服务用户之间的交互。 此建议|国际标准还规定了实施这些程序的系统的一致性要求。 它不包含可用于证明一致性的测试。 [外文原描述]： The ACSE supports two modes of communication: connection-mode and connectionless-mode. The ACSE service definition (see ITU-T Rec. X.217 bis | ISO/IEC 15953) includes both modes of communication. This Recommendation | International Standard only includes the connection mode of communication. This Recommendation | International Standard for the connectionless mode of communication is contained in ITU-T Rec. X.237 bis | ISO/IEC 15955. This Recommendation | International Standard defines procedures that are applicable to instances of communication between systems which wish to interconnect in an open systems interconnection environment in a connection mode. This Recommendation | International Standard includes the Kernel functional unit that is used to establish and release ASO-associations. The Authentication functional unit provides additional facilities for exchanging information in support of authentication during association establishment without adding new services. The ACSE authentication facilities can be used to support a limited class of authentication methods. The ASO-context negotiation functional unit provides the additional facility for the recipient to select the ASO-context from a list offered by the initiator during association establishment. The optional Higher Level Association functional unit provides for the facility to identify ASO-associations and transparently pass data to child ASOs and allows the ASO-context or the presentation context on an ASO-association to be modified during the lifetime of the association. This Recommendation | International Standard specifies: a) procedures for the transfer of information for ASO-association control and the authentication of ASOs and application-entities; and b) the abstract syntax for the representation of the ACSE APDUs. The ACSE procedures are defined in terms of: a) the interactions among peer ACSE protocol machines through the use of Presentation services or supporting ACSE services; and b) the interaction between an ACSE protocol machine and its service-user. This Recommendation | International Standard also specifies conformance requirements for systems implementing these procedures. It does not contain tests which can be used to demonstrate conformance.