SIS SS-ISO 7809-1988 信息处理系统．数据通信．高级数据链接控制程序．各级程序合并

标准号：SIS SS-ISO 7809-1988
中文标准名称：信息处理系统．数据通信．**数据链接控制程序．各级程序合并
英文标准名称：Information processing systems — Data communication — High-level data link control procedures — Consolidation of classes of procedures
发布日期：1988/6/25 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：This International Standard describes the HDLC unbalanced classes of procedures and the HDLC balanced dass of pro-cedures for synchronous data transmission.Balanced operation is intended for use in circumstances which require equal control at either end of the data link. Operational requirements are covered in accordance with the overall HDLC architecture. The procedures use the HDLC frame structure defined in ISO 3309T and the HDLC elements of procedures described in ISO 43352).For the unbalanced classes, the data link consists of a primary station plus one or more secondary stations and operates in either the normal response mode or the asynchronous response mode in a point-to-pomt or multipoint configuration. For the balanced dass, the data link consists of two combined stations and operates in the asynchronous balanced mode in a point-to-point configuration. In each dass, a basic repertoire of com-mands and responses is defined, but the capability of the data link may be modified by the use of optional functions.