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| Chinese National Standard Category: Program language |
| English Title: | Information processing systems--Data communication--High level data link control procedures--Consolidation of classes of procedures |
| Chinese Title: | 信息处理系统-数据通信-高级数据链路控制规程-规程类别汇编 |
| Standard No.: | GB/T 7421-1987 |
| Category No.: | L74 |
| Issued by: | National Bureau of Standards |
| Issued on: | 1987-03-01 |
| Implemented on: | 1987-1-2 |
| Status: | superseded |
| Superseded by: | GB/T 7421-2008 Information technology - Telecommunications and information exchange between systems - High-level data link control (HDLC) procedures |
| Superseded on: | 2009-1-1 |
| Abolished on: | 2009-01-01 |
| Superseding: | |
| Word Count: | 7500 words |
| Similar Standards: |
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