| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 9540-1988 | English | 399 |
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Days<=3
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Wideband modem for synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60～108kHz group band circuits
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GB/T 9540-1988
| Obsolete |
GB/T 9540-1988
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