| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 7421-1987 | English | 719 |
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Information processing systems--Data communication--High level data link control procedures--Consolidation of classes of procedures
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GB/T 7421-1987
| Obsolete |
GB/T 7421-1987
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