"ISDN primary" CNS Standards List| Oxygen self | Information technology | Cutters Steel | Industrial communication | Heading aids | Unplasticized polyvinyl | Marine Portable | Guidelines design | |
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CNS 13931
2018 Edition ISDN primary rate user-network interface - Layer 1 specification 整體服務數位網路原級速率用戶網路間介面–第一層規範 |
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CNS 13933
2018 Edition Application of maintenance principles to ISDN primary rate accesses 整體服務數位網路原級速率接取維護原則應用 |
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