| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 7421-2008 | English | 2354 |
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Days<=9
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Information technology -- Telecommunications and information exchange between systems -- High-level data link control (HDLC) procedures
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GB/T 7421-2008
| Valid |
GB/T 7421-2008
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