GB/T 14399-1993信息处理系统　数据通信　高级数据链路控制规程　与X.25LAPB兼容的DTE数据链路规程的描述.pdf

UDC 681-325 L 了己 Ir 中 华 人 民 共 和 国 国 家 标 准 cB/T 14399一93 iso 7776一1986 信 息 处 理 系 统 数 据 通 信 高级数据链路控制规程 与X.25LAPB 兼容的DTE数据链路规程的描述 Informationprocessingsystems-Data communication-High-leveldatalink controlprocedures-Descriptionofthe X.25 LAPB-compatibleDTEdatalink procedures 1993一05一11发布 1994一01一01实施 国 家 技 术 监 督 M 发布 目 次 。 引言·····················”···”·”·······”·····················”·········”···················… … (1) 1 主题内容与适用范围················‘·····，··”················”·············”···········“·········…… (1) 2 引用标准.· (2 ) 3 帧结构······“····“·”····...············..”·········，················”·······“··“·········“······…… (2 ) 3.1 标志序列···”·“·································，······“·······”·············“··················…… (3) 3.2 地址字段 ······“···”···..·”········”························”..···········“·········… … (3) 3.3 控制字段 ···“·”·”·········，···········，·······““················…….，·”··········“·”·”······”·… (3) 3.4 信息字段 ·····“·“·······.，·········“·····，”············“，··········”·····“···”·”·········… … (3) 3.5 透明性”·······“·”··········“·························一· .，·”·········”·”·········“·”······…… (3) 3.6 帧检验序列(FCS)字段 “·············，，···························“·········，····”····，··，·…·… (4) 3.7比特传输顺序············”············…·…众·..”··”·，·..“.·····”...·..·..··..·……(4) 3.8 无效帧(4) 3.9 帧放弃 ······”··························”············“·················”·············”··········“·… (4) 3.1。 帧间时间填充 ········”·············”·············“··············”·”·········“·”·”·······“·… (4) 3.11数据链路信道状态 ····，.，·“·········