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A1探讨局域网中的数字信号编码A0A2A3A4A5A6A7A8A9A10A11A12A13A14A15A16A17A18A12A13A12A19A20A21A22A23A24A25A26A27A28A29A30A31A32A33A34A35A36A37A26A38A39A40A41A20A42A43A44A45A46A47A48A26A49A50A51A52A53A54A55A56A57A58A59A60A61A62A63A26A64A65A54A66A67A68A57A69A70A26A71A72A31A32A58A59A73A74A75A76A77A78A79A80A81A51A82A83A26A84A85A86A87A20A88A89A60A90A91A92A93A94A95A47A23A24A96A97A50A26A98A99A100A101A21A22A23A24A54A102A103A104A105A81A106A26A107A87A108A109A91A110A111A51A112A113A20A40A114A115A94A95A47A116A21A22A116A117A118A116A58A59A119A70A116A55A120A34A121A29A30A110A75A122A123A29A30A51A29A124A29A30A20A122A123A29A30A51A29A124A29A30A125A126A127A53A122A123A34A35A128A29A124A34A35A129A130A131A54A127A73A108A109A58A59A20A44A45A46A94A95A47A121A96A132A53A26A27A133A53A29A124A34A35A134A117A58A59A135A108A136A137A29A124A138A29A30A20A84A139A29A124A29A30A21A22A75A29A124A34A35A29A124A34A35A27A140A141A26A139A142A143A144A62A145A146A147A148A149A150A20A29A30A26A58A59A27A120A151A152A96A153A26A29A30A31A32A21A22A74A34A35A36A37A129A154A74A26A20A28A29A30A26A31A32A33A34A35A36A37A26A38A39A40A41A54A155A27A21A22A46A136A20A156A157A150A158A84A159A160A53A26A21A22A54A66A1301A96A131A161A1301A29A124A34A35A21A22A162A163A164A165TAB1THEDEFINITIONOFDATASIGNALFORMA78A166A167A145A168NRZL0A57A145A1681A169A145A168A78A166A1671A136NRZ10A55A170A171A26A172A173A174A175A176A153A177A1781A55A170A171A26A172A173A174A175A177A178A179A180A62AMI0A176A153A181A182A34A351A183A145A168A128A184A145A168A54A143A144A26A31A321A55A185A186A187A170A188A189A190A191A108A136A220A183A145A168A128A184A145A168A54A143A144A26A31A320A55A185A186A187A170A188A1891A176A153A181A182A34A35A192A193A194A32A21A220A55A170A171A26A121A170A174A175A104A57A195A169A177A1781A55A170A171A26A121A170A174A175A104A169A195A57A177A178A196A110A192A193A194A32A21A22A55A170A171A26A121A170A174A175A197A153A84A198A177A1780A55A170A171A26A172A173A174A175A177A1781A55A170A171A26A172A173A174A175A176A153A177A1781A139A78A166A167A22A58A59A29A124A34A35A65A199A160A53A139A199A200A201A26A202A203A155A27A133A53A186A204A78A64A26A145A168A129A130A131A135A108A136A29A124A20A185A99A205A206A121A84A204A31A32A207A208A209A210A145A168A211A164A54A176A153A178A212A20A160A213A26A214A215A27A53A84A204A184A145A168A129A216A130A84A204A135A108A136A29A54A217A183A145A168A216A130A218A84A204A135A108A136A29A54A155A27A78A166A167A145A168NRZLA137NONRETURNTOZEROLEVELA138A20NRZLA160A53A219A220A221A128A222A223A92A121A54A127A224A74A51A225A226A29A124A29A30A20NRZLA121A102A176A153A96A227A228A229A230A231A164A165A54A185A232A184A145A168A130A131A135A108A1361A54A183A145A168A130A131A135A108A1360A27A233A234A29A30A120A34A235A236A50A184A237A238A239A185A159A235A236A26A153A40A229A230A240A164A26A20NRZA26A84A204A178A99A241A75NRZ1A137NONRETURNTOZEROA54INVERTONONEA138A20NRZ1A55A84A204A31A32A26A242A144A207A208A121A145A168A243A242A211A164A54A29A30A26A21A22A244A163A27A55A84A204A31A32A26A172A173A65A245A246A34A35A27A247A80A224A177A178A20A248A75A196A110A21A22A26A84A204A249A250A54A34A35A225A22A96A31A251A26A27A252A253A186A204A34A35A36A37A254A170A26A183A184A180A40A41A20A55A255A239A58A59A0A1A2A54A243A3A34A35A177A178A4A31A243A3A34A35A26A183A184A5A6A68A75A126A7A20A78A166A167A22A63A153A69A26A67A53A117A118A54A249A199A8A9A71A72A20A252A104A219A10A153A11A12A74A110A54A13A14A64A15A63A16A54A17A8A9A104A219A18A80A222A223A170A26A164A65A19A20A217A21A22A23A24A64A15A20A96A127A102A78A25A26A47A48A34A35A58A59A20A272A122A28A128A29A30A31A32A162A33A34AMIA43A35A36A31A32A37A38A202A39A40A41A42A37A44A32A45A45A28A128A29A30A31A32A46A47A48A49A80NRZA37A50A40A51A52A53A202A54A55A56A57A50A58A59A60A168A61A42A37A62A63A80A28A202A64A65A50A66A68A128A29A60A69A162A33A34AMIA50A70A71A72A46A159A73A66A68A74A75A30A31A32A500A46A200A30A31A32A501A91A76A77A78A43A79A77A78A171A81A74A75A60A62A63A168A61A82A83A62A84A85A62A86A87A50A54A55A88A89A90A501A92A93A94A46A95A96A52A97A98A99A100A101A46A66A68A102A50A103A40A651A110A104A105A106A128A29A107A108A46A226A109A80A111A86A162A82A100A101A50A112A113A114A115A116A60A117A88A69A118A119A89A90A500A92A93A94A120A95A96A88A65A121A123A60A35A36A31A32A37A62A63A70A71A114A124A41A125A46A193A93A126A43A127A129A114A162A33A34AMIA137A130A40A106A603A122A162A131A132A211A162A131A132A214A88A39A133A40A134A135A136A138A139A50A42A37A140A141A60A168A142A143A147A66A68A69A103A40A65A56A57A50A92A93A144A145A146A110A148A149A150A137A151A40A152A128A29A107A108A46A73A120A148A137A151A64A152A107A108A60A153A124A47A50A154A155A156A32A157A88NRZA50A64A158A46A131A235A50A160A148A161A155A50A163A164A60A91A202A162A131A132A42A37A69A103A65A92A93A120A187A144A145A146A165A166A69A167A169A50A107A108A46A218A170A172A135A173A174A55A107A108A175A112A113A100A101A46A176A119A146A100A101A60A177A63A50A64A61A162A131A132A42A37A140A141A88A178A179A180A93A42A37A43A181A182A178A179A180A93A42A37A60A162A131A132A42A37A140A141A69A54A55A56A57A102A62A63A183A184A46A178A179A180A93A42A37A235A63A202IEEE8023A212A185A46A63A202A176A119A186A202A100A188A128A189A43A162A190A191A50A192A191A194A173A195A196A197A200A181A182A178A179A180A93A42A37A69IEEE8025A143A147A50A198A199A162A190A191A201A203A204A196A102A205A73A147A206A60A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