| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB 7609-1987 | English | 359 |
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Days<=3
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Total distortion measuring method for PCM channel in the telecommunication network
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GB 7609-1987
| Obsolete |
GB 7609-1987
|