ETSI EN 300 012-1-2000 Integrated Services Digital Network (ISDN) Basic User-Network Interface (UNI) Part 1 Layer 1 Specification (V1 2 2)《综合业务数字网(ISDN) 基群速率用户网接口(UNI) 第1部分 第1层规范(版_1.pdf

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