车载以太网降噪措施的必要性及共模选型标准

时间： 2024-10-23 来源：韬略科技EMC公众号

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一、前言

随着汽车行业朝着电动趋势发展，摄像头、雷达、传感器等设备的设备使用场景越发广泛，对高速数据传输的需求也愈发依赖。而车载以太网具有低延迟、高带宽的特性可以满足高速、大容量数据传输，进一步支持高级智能驾驶功能的同时显著减小车身重量和整体线束成本，在现在及未来都会占据汽车通信总线的一席之地。

二、车载以太网降噪措施的必要性

1.以太网等差分信号传输中因各种原因共模电流会产生噪声，如IC内部原因、其他的走线或者空间耦合原因以及不同模式下的差共模转换产生的噪声。

2.在以太网传输时会因为双绞线和USB、HDMI等通信电缆的区别，会导致共模电流的磁场无法消除从而引起共模噪声能量变大。

3.高速差分信号存在偏斜（时间偏差）或振幅偏差，则两条线的信号均衡将被打破，从而产生共模噪声。

4.为了处理越来越复杂的车内电磁环境，通信链路的抗扰性能需要进一步的防护。基于以上原因，为了不影响车载以太网通信的正常通信以及不影响整体车内电磁环境，所以很有必要在车载以太网链路上增加滤波和防护措施，而在差分对上的滤波措施，最常见和最常用的就是共模滤波器，共模滤波器有不同的种类，磁芯、滤波频段各有差异，能应用在车载以太网上的共模则要求更严格。

三、车载以太网共模选型标准

为了保证车载以太网正常通信，并不是随便一颗信号线共模都可以使用在车载以太网通信链路上，所使用的共模必须遵循BS EN IEC 62228‑5:2021标准中给出的S参数标准，以保证CMC在滤除共模噪声的同时不会影响正常车载以太网的通信质量。如下图所示。

满足以上要求的共模电感需要在绕组、线圈、工艺上严格把控才有可能达到该标准上的要求，而韬略科技的车载以太网共模则都能满足该标准的要求，达到滤波要求的同时也保证了通信的正常。

四、总结

随着车载以太网的慢慢普及和使用，车载以太网链路上的滤波普及十分有必要，而作为滤波首选的共模滤波器，在选择时也应该更加谨慎和合理。

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本文由ll转载自韬略科技EMC公众号，原文标题为:汽车以太网共模对车载以太网的重要性，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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SERIES,HLT30P06,1.0SMB22CA,SMCJ220CA,32D561K,2R230S-6X4.2,HLT30P03,HLS187N80,5D241KJ,SMD1206-075-16V,SMD2920-200-16V,1.5KE51A,7D781K,HLS170N30PF5,P6SMB,HLS60R580,SA70CA,1.5KE36CA,5D121K,LC SERIES,DA SERIES,5KP36A,P6SMB16A,SMAJ18CA,SM8,SA17CA,1.5KE170CA,SMD1812-351,25D122K,5KP90CA,S SERIES,P0080TA,SMF,SMDJ51A,3KP45CA,P6SMB15A,ESD3V0J4,3R230S-6X8,3KP58CA,HLP38N30,10D471KH,25D561K,1.5KE56A,ESD8V0D5B,US2B,US2A,10D471KJ,US2K,HLS12N100C,US2J,30V-900,US2G,SA5.0CA,US2D,HLP4P20,RS2AB,20D911KH,YAZ1P5D XXX,HLR08U02,20D911KJ,RS2AF,5KP24CA,US2M,P6SMB16CA,HLP110P06,SMBJ90A,10D-20,SMF64A,US1B,US1A,SMBJ12CA,2R***L-5.5X6 SERIES,US1J,P6SMB13A,US1G,US1D,US1M,ESDLC24VD3B,US1K,SMBJ5.0A,HLT6N06,30V-090,SMD2920-100-33V,ESD8V0D3B,HLS20100N2,5D561K,1.0SMB6.8A,Y1ZD9V1,HLS120R800,P6SMB12A,YC2M2012B,20D220K,P8SMB75CA,YAZ1P5D10,32D911K,YAZ1P5D16,YAZ1P5D15,YAZ1P5D18,YAZ1P5D12,YAZ1P5D11,P6KE180CA,YAZ1P5D13,Y3ZP2D5V6,Y5ZP2D XXX,P6SMB10A,P6SMB11A,HLR75S12,Y3ZP2D5V1,MF58-203F-3950,25D SERIES,P8SMB64A,YAZ1P5D20,HLP75N08,P6SMB100CA,YAZ1P5D27,5.0SMDJ78CA,SMD0603-003-30V,YAZ1P5D22,20D,YAZ1P5D24,Y3ZP2DXXX,10D101K,1.5KE10CA,YAZ1P5D30,7D471K,YAZ1P5D39,SMF60A,YAZ1P5D33,25D431K,YAZ1P5D36,5D820KJ,5D560K,P6KE27CA,5KP33A,P6SMB82CA,10D102K,14D911K,20D221K,YAZ1P5D43,7D470K,5KP11CA,HLR12U12,YAZ2D8V2,20D470KJ,P6SMB47CA,RS2GB,20D K系列,HLT60N03,HLT60N02,HLS60150K,MF52A-104F-3950,1.5KE540A,HLT60N08,RS2GF,HLT60N04,SMDJ200CA,HLT60N06,16V-1000,SMF70A,SMDJ190CA,3KP64A,HLR12U06,HLR12U04,HLR12U02,10D112K,SMAJ48CA,SMBJ43CA,10D680K,HLT60N10,14D561K,1.0SMB9.1A,HLS247N120Q,1N4001W,S3AF,S3AC,SMCJ7.5A,SMAJ400A,S3AB,600V-110,60V-300,SMF19CA,ES3DBF,SA90A,34S471K,10D241K,SMD1206-075-6V,SMBJ18A,MF52A-303J-4200,HLP840,14D431K,HLT4P06,P8SMB SERIES,25D,1N4002W,MF52A-104H-4100,SMAJ300CA,P6KE220CA,SA40CA,25D911K,HLP830,YC2M2012B161GBE,1N4003W,3KP9.0CA,1.5KE510CA,SMD1812-421,MF52A-302J-3950,HLT5N04A1N,SMD1210-035-16V,Y3ZP2D18,14D681KH,P6KE100CA,2R300S-8X6,SMBJ16A,MF52A-103F-3380,HLS145NH80PF5,14D KJ 系列,Y5ZP2D XXX SERIES,SMBJ30CA,P6SMB SERIES,5KP28A,14D681KJ,S3DB,Y3ZP2D10,S3DC,Y3ZP2D12,HL78MXX,Y3ZP2D11,Y3ZP2D14,Y3ZP2D13,Y3ZP2D16,0603,Y3ZP2D15,YAZ1DXXX SERIES,14D112KJ,S3BF,HLT4P10,1N4004W,SMF110A,S3BB,S3BC,SMD1210-200-6V,60V-375,SMAJ8.5CA,SMAJ180A,HLP12P06,SMBJ17A,SMF85CA,RS2BB,SMBJ120CA,14D121K,14D112KH,RS2BF,14D561KJ,5KP8.0A,1N4005W,14D561KH,5KP250A,3KP75CA,SMD1812-401,Y3ZP2D39,SMBJ14A,HLR24U12,P6SMB18A,7D621KH,SMDJ16CA,7D621KJ,14D560K,600V-160,Y3ZP2D33,Y3ZP2D36,SMBJ130A,S3DF,RS2DB,1N4006W,ES2ABF,Y3ZP2D30,RS3KBF,5KP120CA,SA100A,SMBJ15A,SMAJ170CA,2R400L-8X6,RS2DF,Y3ZP2D20,Y3ZP2D22,600V-150,Y3ZP2D24,Y3ZP2D27,Y1ZP35D7V5G,YC2M 2012B SERIES,100D-9,1N4007W,YAZ1D6V2,ESD24VD8,HLP9N20,SMBJ12A,SMAJ6.0A,ESD24VD3,P6KE62CA,ESD24VD5,YAZ1D6V8,20D511KH,20D511KJ,SA7.5CA,ESD36VD3,5.0SMDJ78A,SMCJ7.0A,SMDJ51CA,HLG2301BA1N,5.0SMDJ48CA,Y5ZP2D3V9,Y5ZP2D3V3,ES5JC,Y5ZP2D3V6,SMBJ13A,15KP51A,Y5ZP2D3V0,S3GF,P6KE75A,S3GC,S3GB,10D201KJ,SMCJ150A,30V-110,HLS18N200K,SMD1812-200-16V,3R075L-6X8,SA6.0A,S3JF,5KP8.5A,SMAJ78A,S3JB,YAZ2D110,S3JC,ESDSMDA15C,HLP14N10,ESD36VAP,US3ABF,5KP120A,30V-120,SMBJ10A,SMD1210-075-6V,SMBJ11A,SMAJ22CA,7D180KJ,5D330KJ,SMCJ6.5CA,HLS2045N2,2R***S-8X6,YAZ2D100,SMAJ75A,SMCJ36A,RS2KB,SMDJ210A,SA190CA,15KP75CA,RS2KF,7D K SERIES,5.0SMDJ75A,P0300DA,ES5GC,SMF54CA,YAZ2D130,1.5KE100A,3R600L-6X8,P6SMB170A,HLS16N100C,SMCJ45CA,3KP60A,US5GBF,RS2JB,15KP240CA,HLT40P03PF5,RS2JF,HLT40P03PF4,P6KE75CA,S3KB,HLT9P01C,YAZ2D120,S3KF,S3KC,SMAJ6.5A,SMBJ440A,Y1ZP35D47G,RS2MF,7D K,SMCJ58CA,HLT20N10,HLS20150K,SMDJ7.5CA,SMD1206-301,RS2MB,MF52□□□4300,5.0SMDJ17CA,1.5KE18CA,ESD3V3APB,14D201KJ,3R200S-5X7.6,5KP60CA,HLT15N03C,5.0SMDJ70CA,YAZ2D150,HLT20N06,HLS90N60PF5,SMCJ33A,7D K系列,HLT30ND03PF4,20D751KJ,20D751KH,SMD1206-050-24V,YC2M1012B121FBP,3R470L-6X8,L SERIES,20D K SERIES,S3MC,S3MB,ES5DC,HLT20N15,HLS250N80,YAZ2D140,14D301K,SA6.5A,S3MF,5.0SMDJ33CA,P0640S,SA36CA,SMBJ,HLS90N30PF5,SMDJ20CA,SMF6.0A,HLR30U03,HLS130N85,LB SERIES,HLR30U02,HLR30U04,3D-13,RS1G,HLR30U06,RS1D,7D681KJ,3D-11,ESDLC5V0D8B,RS1B,YAZ2D170,20D361K,SMD1210-020-30V,HLS8060K,RS1A,P8S

2021/10/18 - 音特电子 - 选型指南代理服务技术支持采购服务

适用于汽车行业的KX311CR-MZ Kionix™技术加速度计IC规格书

描述- KX311CR-MZ是一款基于Kionix技术的MEMS电容式3轴加速度计，适用于汽车领域。该产品支持±2g、±4g和±8g的加速度范围，采用差分电容原理进行加速度感应，并利用共模消除技术降低误差。产品特性包括可选加速度范围、输出数据率、低功耗或高分辨率模式、数字高通滤波器输出、可配置唤醒/睡眠功能、数字I2C和SPI接口、无铅焊接性、优异的温度性能、高冲击生存能力、工厂编程的偏移和灵敏度、自检功能等。

型号- KX311CR-MZ

26.Mar.2024 - ROHM - 数据手册 - Rev.001 代理服务技术支持采购服务

优恩半导体（UNSEMI）ESD静电保护/雷击浪涌保护器件/串口芯片产品选型指南（中文）

目录- 企业简介和产品概览静电保护器（ESD）瞬态抑制二极管（TVS）半导体放电管（TSS）双向触发二极管（SIDAC）压敏电阻（MOV）陶瓷气体放电管（GDT）玻璃气体放电管（SPG）微型防雷模组（MLPM）自恢复保险丝（PPTC） RS485/422收发器 CAN收发器网口RJ45连接器分立功率器件 EMI保护元器件

型号- SMDJ-AT SERIES,07DXXKJ,UN2E8-XXXML SERIES,SMBJ,UN2E5-XXXLL SERIES,UN232,UN2E8-XXXL HV,4.0SMF SERIES,UN1812-XXXCSMD SERIES,10DXXKJ,5.0SMDJ-AT SERIES,P6KE SERIES,30KP SERIES,SACB SERIES,UNS1K SERIES,PXXXSC SERIES,P4KE,SMD0603 SERIES,10DXXKEC SERIES,UN490E,UN3E8-XXXHP,UNSDC12V-3L,07DXXK,07DXXL,UN3E5-XXXMSMD,PXXXSB,15KPS,PXXXSA,PXXXSB-2L,P4SMA SERIES,SA SERIES,SMAJ,UN2220 SERIES,05DXXKJ,SAC SERIES,SMF SERIES,PXXXSC,KXXXSA SERIES,20KP,5.0SMDJ SERIES,0402 SERIES,20KP SERIES,TPSMAJ SERIES,PXXXLB SERIES,SMCJ SERIES,UN3490,P4SMA,UNSDC24V-3L,SMDJ,UNS1K,UN3E6-XXXMM,UN65HVD75,UN2E8-XXXL HV SERIES,SMDT,UN1812 SERIES,UN3220 SERIES,SA,UN2E8-XXXML,UNS4032 SERIES,UN2E8-XXXHL SERIES,UN2E5-XXXL HV,UNSDC58V-2L,SMD1210 SERIES,UN2E5-XXXLSMD,PXXXEC SERIES,UN3485,UN16,5KP,1.5KE SERIES,TP5.0SMDJ,14DXXL SERIES,07DXXKBC SERIES,MCM系列,UNS2K,UN2E8-XXXMSMD,UN2E5-XXXLL HV SERIES,10DXXKEC,UNSDC24V-2L,32DXXL SERIES,UN3E8-XXXHM SERIES,SMCJ,TPSMB SERIES,UN1210-XXXBSMD SERIES,UN3E6-XXXM,TPSMDJ SERIES,UN65HVD233,UN65HVD234,100M,UN65HVD232,UN65HVD230,SMBJ-AT,UN2E5-XXXL,UN2E8-XXXM,UN1210-XXXBSMD,34SXX,KC SERIES,UN2E6-XXXLSMD SERIES,UN2E8-XXXH,UNB-XXXN-SMD,UN3E8-XXXHMF,32DXXKJ SERIES,UN1050,UN3232E,UN1050ISODUB,32DXXKJ,40DXXK,UNS3220,UNB-XXXN/M,40DXXL,UN3085NE,SMCJS,UN2E8-XXXHSMD,HCM系列,TPSMB10J,32DXXK,32DXXL,PXXXEC,UN30,PXXXEB,KXXXSB,PXXXEA,30KP,KXXXSA,P6SMB SERIES,1012,KXXXSD1,PXXXSC-2L SERIES,15KP,PXXXSC-2L,0603,SMD2920 SERIES,10SMBT,14DXXKJ,UN82C250,UNSRS485-2HL,UN82C251,10SMBJ,25DXXL SERIES,05DXXL SERIES,TPSMC SERIES,UN2H8-XXXL HV SERIES,UNSDC58V-3L,SM8Z SERIES,TPSMCJ SERIES,SM5Z,UN6,UN3E5-XXXL,UN3088E,KXXXG SERIES,PXXXTB,PXXXTA,KXXXG,UN2E5-XXXLSMD SERIES,KA SERIES,UNB-XXXN-SMD SERIES,2012,UN3088ES,07DXXL SERIES,5KP SERIES,UN3485ISO,8KP SERIES,PXXXEA SERIES,UNA-XXXN/M SERIES,SMCJS SERIES,3KP,SM8Z,UN3E5-XXXLM,SMCJ-AT SERIES,LCE SERIES,UNC-XXXN/M SERIES,UN3E8-XXXHM,PXXXSA SERIES,UNSRS485-2H,SMCJ-AT,UN0805 SERIES,PXXXDM,POE58C,15SMBJ,PXXXTB SERIES,PXXXSB-2L SERIES,UNA-XXXN-SMD,40DXXKJ SERIES,UNS3220 SERIES,UN1206 SERIES,P4KE SERIES,SM5Z SERIES,UN2E8-XXXMSMD SERIES,UN3E6-XXXMM SERIES,05DXXK,05DXXL,UN600 SERIES,1012 SERIES,UNB-XXXN/M SERIES,8.0SMDJ,UNSRS485-2L,P6SMB,SACA SERIES,40DXXKJ,1000M,40DXXL SERIES,PXXXDM SERIES,SACA,UN0603 SERIES,SACB,UN2E5-XXXL SERIES,UN2H8-XXXLL HV SERIES,SMD2920,0402,8.0SMDJ SERIES,25DXXL,25DXXK,UN30 SERIES,10DXXL SERIES,25DXXKJ,20DXXL SERIES,5KPS,UNA-XXXN-SMD SERIES,UN485E,UN2E8-XXXHL,PXXXSB SERIES,UN485ES,PXXXTA SERIES,UN3E8-XXXHMF SERIES,UN2H8-XXXLL HV,SMDJ-AT,4.0SMF,SMF,TPSMB10J SERIES,0603 SERIES,5KPS SERIES,UN2E8-XXXH SERIES,KD SERIES,UN60,SMAJ-AT SERIES,TPSMDJ,UN1206-XXXASMD SERIES,UN2E8-XXXHSMD SERIES,UN3232E-T,UN1210 SERIES,14DXXKSC,07DXXKBC,10DXXK,UNSDC48V-2L,10DXXL,53DXXK,UN3E8-XXXHSMD SERIES,2012 SERIES,UN0805,UN3E5-XXXMSMD SERIES,KA,KB,UN1812-XXXCSMD,KC,TPSMCJ,UN2E8-XXXLL HV,6.0SMAJ SERIES,KD,14DXXKSC SERIES,UNS2K SERIES,10SMBJ SERIES,TP5.0SMDJ SERIES,SMD1812 SERIES,UN60 SERIES,5.0SMDJ,UN3490E,UNSDC48V-3L,20DXXKYC SERIES,SMD0603,SMD1812,KXXXSB SERIES,UN1206,UN16 SERIES,SMBJ SERIES,UNSRS422-2H,SMDT SERIES,UN1210,UNSRS422-2L,UN135 SERIES,TPSMBJ,PXXXLC SERIES,UNS4032,UNA-XXXN/M,0201 SERIES,UN1206-XXXASMD,UN2H8-XXXL HV,5.0SMDJ-AT,UN3E5-XXXL SERIES,UNC-XXXN/M,20DXXKYC,UN3485S,UN3E6-XXXM SERIES,34SXX SERIES,UN2E5-XXXLL,0201,UN3E8-XXXHP SERIES,UN3E8-XXXH SERIES,UN1042,UN3220,TPSMAJ,UN1040,UN2E8-XXXLL HV SERIES,15KP SERIES,8KP,UN2E5-XXXL HV SERIES,UN2E6-XXXLSMD,6.0SMAJ,UN3E8-XXXHSMD,34SXXJ SERIES,SMD1206 SERIES,SMBJ-AT SERIES,TPSMA SERIES,LCE,UN600,14DXXK,UN6 SERIES,14DXXL,UNC-XXXN-SMD SERIES,UNSRS422-2HL,15SMBJ SERIES,SAC,SMD0805 SERIES,SMAJ SERIES,UN3E5-XXXLM SERIES,UN3E5-XXXLSMD SERIES,UN250 SERIES,UN3E8-XXXH,UN485CUA,UN488E,UN250,KB SERIES,PXXXLC,UN2E5-XXXLL HV,UN135,PXXXLB,PXXXLA,SMD1206,UN0603,UN1812,20DXXL,20DXXK,PXXXEB SERIES,10SMBT SERIES,1.5KE,UNC-XXXN-SMD,3KP SERIES,P6KE,KXXXSD1 SERIES,TPSMC,SMD0805,TPSMB,TPSMA6J SERIES,TPSMA,TPSMBJ SERIES,34SXXJ,20DXXKJ,SMD1210,SMDJ SERIES,UN2220,UN2E8-XXXM SERIES,TPSMA6J,UNSDC12V-2L,1.5SMC SERIES,15KPS SERIES,SMAJ-AT,PXXXLA SERIES,UN3E5-XXXLSMD

2021 - 优恩半导体 - 选型指南代理服务技术支持采购服务

【经验】LVDS线路的EMC对策

LVDS即低压差分信号是目前最常见的差分传输系统，由于其高速传输能力、低功耗、低电压的特性优势，广泛应用于各种设备。与USB、HDMI等外部接口相比，LVDS多用于连接基板与屏的内部接口，同时在产品进行EMC测试时，LVDS也是经常遇到的一大问题点。韬略科技本篇介绍了一系列有关的对策。

2021-07-24 - 设计经验代理服务技术支持采购服务

【元件】mentech铭普全新推出超小型片式TDH系列功率变压器和车载共模电感

铭普光磁作为国内片式网络器件主要生产商，在深耕片式网络器件的同时，并在其片式结构上扩展应用，开发了新款片式TDH系列功率变压器和车载以太网片式共模电感。TDH系列片式变压器比传统的骨架磁芯结构尺寸大大降低。可用于超薄型隔离电源模块等产品；车载片式共模电感器件可满足车载以太网应用，CAN BUS等信号总线，主要用于信号滤波等功能，已通过通过AEC-Q200认证

2024-11-21 - 产品代理服务技术支持采购服务

云路（Yunlu）纳米晶磁芯选型指南

目录- 公司简介常用计算公式设计案例铁基纳米晶软磁材料纳米晶磁芯在各应用场景下的优势纳米晶磁芯系列

型号- N-C-806045,N-R-1057340,N-R-907030,N-C-372315,N-C-292314,N-C-644020,N-R-1256025,N-C-292313,N-C-644025,N-C-251613,N-C-705070,N-R-764217,N-T-191628,N-C-251610,N-C-604520,A-B-121225,N-R-564440,N-R-19313040,N-R-845420,N-C-412416,N-C-635025,N-R-1025230,N-C-826720,N-R-231209,N-R-1177520,N-C-321910,N-R-302506,N-C-351909,N-C-805520,N-C-453015,N-C-512713,N-C-825870,N-C-252010,N-C-323010,A-R-1327950,N-R-48129630,N-C-1308225,N-R-1036630,N-R-442116,N-R-1025225,N-R-905940,N-R-734411,N-R-1339020,N-T-1266835,A-B-181502,N-C-503015,N-R-1043115,N-C-472715,N-R-874130,A-B-181103,N-R-1457520,N-R-764040,N-C-322208,N-C-211410,N-R-806030,N-C-804045,N-R-1328020,N-T-1081915,N-C-201208,N-C-271512,N-C-493120,A-T-473118,N-R-372508,N-R-777220,N-R-1075745,N-T-16713240,N-C-332315,N-R-502815,N-C-523615,N-C-1056030,N-C-301650,N-R-1008030,N-T-1223913,N-R-1328030,N-C-805025,N-R-625845,N-R-703640,N-R-824130,N-C-1207030,N-C-1006020,N-C-936070,N-R-352508,N-C-181205,N-C-181206,N-C-332425,N-C-1308050,N-C-523625,N-C-544020,N-C-211408,A-B-181602,N-C-251508,N-R-281510,A-B-181202,N-C-211510,N-R-1007040,N-C-322013,N-C-704970,N-C-1206130,N-C-181210,N-R-1287925,N-T-572420,N-C-322012,N-R-625830,N-C-322010,N-C-905045,N-R-1216335,N-R-21013050,N-R-503409,N-C-13010030,N-C-302003,N-C-503220,N-R-1296915,N-R-543940,N-R-824125,N-C-523630,N-C-181108,N-R-473110,N-C-936055,N-R-723530,N-C-462725,N-R-1216340,N-C-906020,N-R-623520,N-C-271525,N-R-906030,N-R-572820,N-C-302010,N-T-442824,N-C-302015,N-C-281910,N-C-503215,N-R-1416330,N-T-542320,N-C-211508,N-C-504025,N-C-402510,N-C-504020,N-R-625815,N-C-31516050,N-C-936045,N-C-211610,N-C-1206030,N-C-402515,N-C-907045,N-C-271710,N-R-473040,N-C-191205,N-R-1338020,N-R-1265640,N-C-080505,N-C-1077055,N-C-402520,N-C-473220,N-C-704025,N-R-755245,N-C-362520,N-C-221408,N-R-905245,N-T-1022215,N-C-403215,N-R-775230,N-R-872613,N-R-473609,N-R-1339120,N-C-100505,N-C-493215,N-R-1348220,N-T-563820,N-T-673317,N-C-1077045,N-R-1025240,N-T-885315,N-R-1025245,N-R-523520,N-C-472815

2023/3/4 - 云路 - 选型指南代理服务技术支持采购服务