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DECT 原理与测试介绍

DECT 原理与测试介绍. 测试开发网 http://www.testdevgroup.com. DECT 介绍. What is DECT? Wireless Cordless Telecommunication Standards DECT Technical Summary How does DECT work? DECT 相关名词缩写解释 DECT 测试项目 使用 CMD60 进行 DECT 测试. What is DECT?.

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DECT 原理与测试介绍

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  1. DECT 原理与测试介绍 测试开发网 http://www.testdevgroup.com

  2. DECT介绍 • What is DECT? • Wireless Cordless Telecommunication Standards • DECT Technical Summary • How does DECT work? • DECT相关名词缩写解释 • DECT测试项目 • 使用CMD60进行DECT测试 http://www.testdevgroup.com

  3. What is DECT? DECT –Digital Enhanced Cordless Telecommunications(数字增强无绳电话) 最初DECT为Digital European Cordless Telecommunications (欧洲数字无绳电话)的缩写,后来为了将DECT在更大范围内推广将European 改为 Enhanced. DECT是在CT2和CT3的基础上开发的无绳通信标准 DECT 标准最初发表于1992年 - ETS 300 175 and ETS 300 176 DECT最新标准为DECT6.0 DECT工作于1880MHz到1900MHz 频段使用GFSK调制方式. DECT支持的服务: PSTN,ISDN,Wireless PABX,etc. CT2第二代无绳电话通信标准 CT3第三代无绳电话通信标准 PSTN 公共交换电话 网 ISDN中文名称是综合业务数字网，通俗称为“一线通” PABX数字程控交换机 http://www.testdevgroup.com

  4. Wireless Cordless Telecommunication Standard PACS-UA PACS variant A for the US unlicensed bands, related to PHS PACS-UB PACS variant B for the US unlicensed bands(WACS TDD) http://www.testdevgroup.com

  5. DECT Technical Summary http://www.testdevgroup.com

  6. DECT Technical Summary http://www.testdevgroup.com

  7. DECT Technical Summary http://www.testdevgroup.com

  8. DECT Technical Summary http://www.testdevgroup.com

  9. DECT Technical Summary http://www.testdevgroup.com

  10. DECT Technical Summary http://www.testdevgroup.com

  11. DECT Technical Summary http://www.testdevgroup.com

  12. How does DECT work? http://www.testdevgroup.com

  13. How does DECT work? http://www.testdevgroup.com

  14. How does DECT work? http://www.testdevgroup.com

  15. DECT相关名词缩写解释 FP – Fixed Part 固定装置. 即为DECT Base Station。 PP – Protable Part 移动装置，手持设备。DECT Phone DECT Test Mode – 在DECT测试系统中FP必须在特殊的测试模式建立呼叫链接,在这种模式FP只接受测试消息,对于其他的信息一概忽略. GAP Mode – 在GAP Mode使用默认的信号处理方式处理消息，对于测试消息则一概忽略。 在默认情况DECT设备开机后即进入GAP Mode. Dummy Bearer – 是FP送给PP的同步信号.Dummy Bearer是在FP锁定PP后10ms发送到PP的,它包含同步和认证信息. Slot – Dummy Bearer 和 Traffic Bearer 的 Slot Number 的取值范围为 0 – 11,并且不可以相同.此外相邻的Slot（例如 5,6 或 11,0）只有在 Dummy Bearer 和 Traffic Bearer 的channel number 相同时容许。对于有些FP只能采用偶数的Slot，而有些则只能使用奇数的Slot。如果需要Traffic Slot可以更改。 RFPI – Radio Fixed Part Identity 是一个数值用来标识FP,只有PP设置的RFPI Number和FP的RFPI一致时才能建立会话连接。 PMID – Protable Part Mac Identity 是一个数值用来标识PP，大多数FP在测试模式时可以接受任何PMID，并且PMID可以在会话建立起来后被FP检测出来。 PARK – Protable Access Rights Key 是一个密码用来设定PP只与特定的几个FP建立会话链接。 IPUI – International Protable User Identity 是PP的一个数字标识，通过此标识FP可以和PP建立会话连接。当会话连接建立后FP会记录此标识。 NTP - Normal Transmit Power 平均传输功率。 http://www.testdevgroup.com

  16. DECT测试 DECT测试标准: ETSI CTR/TBR-6 Radio Equipment and System(RES);Digital Enhanced Cordless Telecommunications(DECT);General terminal attachment requirements ETSI CTR 6 / TBR 6 General Terminal Attachment Requirements: Radio Aspects (base standard ETS 300 176 Ed 2) ETSI CTR 10 / TBR 10 General Terminal Attachment Requirements: Telephony Applications (base standard ETS 300 176 Ed 2) ETSI CTR 22 / TBR 22 General Terminal Attachment Requirements: Generic Access Profile (base standard ETS 300 494 and ETS 300 497 Ed 2 DECT测试仪器: Anritsu - MT8801B Radio Communication Analyzer R&S – CMD60/CMD65 Digital Radiocommunication Tester R&S – TS1220 DECT Protocol Tester R&S – PTW15 DECT Signalling Test Unit Agilent – 8923A DECT Test Set [Obsolete] Agilent – 8923B DECT Test Set [Obsolete] http://www.testdevgroup.com

  17. DECT测试项目 Accuracy and stability of RF carriers[TBR06-07] DECT 信道划分: Fc = F0 - c x 1.728 MHz F0 = 1 897.344 MHz, c = 0,1, ..., 9. Test Method The carrier frequencies as measured shall be within ± 50 kHz of the appropriate nominal DECT carrier frequency Fc. Frequency offset. It is obtained as the average of the demodulated signal over the B field for a selectable number of received bursts. Accuracy and stability of timing parameters[TBR06-08] http://www.testdevgroup.com

  18. DECT测试项目 Transmission burst[TBR06-9] Normal Transmitted Power (NTP)[TBR06-9.1.3] The NTP is the transmitted power averaged from the start of bit p0 of the physical packet to the end of the physical packet. Power-time template[TBR06-9.4] The first bit of the burst (P0) derived from the modulation signal (not displayed) is used as the time reference. Bit P0 is derived with an accuracy of approx. 1/12 bit, ie approx. 0.075 ms. http://www.testdevgroup.com

  19. DECT测试项目 RF carrier modulation [TBR06-11] Max ±B-Field Modulation[TBR06-11.3.2] The peak values of the modulation deviation measured over the B field that maximally and minimally deviate from the frequency offset. Frequency drift [TBR06-11.7] http://www.testdevgroup.com

  20. DECT测试项目 Radio receiver reference BER and FER [TBR06- 13.2] Set RF transmission to a power level of 70 dBmV/m (-73 dBm) at the input of the EUT receiver. The EUT should working on Loopback mode. http://www.testdevgroup.com

  21. 使用CMD60进行DECT测试 CMD60主要技术指标: TX Frequency Accuracy ± 3 kHz TX Level Accuracy at RF IN/OUT <1.5 dB TX Level Accuracy RF OUT2 ± 5 dB Accuracy of Power Measurement at RF IN/OUT < 2.5 dB in the range +30 to -10 dBm < 3 dB in the range -10 to -50 dBm http://www.testdevgroup.com

  22. 使用CMD60进行DECT测试 Connect N socket RF IN/OUT of CMD60 with antenna connector of PP or FP. Alternatively, an antenna can be connected to the N socket for coupling via the air interface. Select your EUT type: PP or FP http://www.testdevgroup.com

  23. 使用CMD60进行DECT测试 设置参数: RFPI PMID TRAFFIC SLOT TRAFFIC CARRIER RF LEVEL MODE 如果当前测试频段不是标准的欧洲频段, 需要设置CARRIER # OFFSET确保测 试仪器和产品在相同的载波频率下. 若要测试南美频段则需安装K61扩展选件. http://www.testdevgroup.com

  24. 使用CMD60进行DECT测试 所有设置项目设置完成后按“SETUP CONNECT”建立链接. 若仪器和产品设置正常则会进入如下测试界面. 否则仪器会提示无法建立连接. 若无法建立连接需考虑以下几个方面: 1.参数设置是否正确,RF通路是否正常 2.产品是否工作于测试模式 3.产品是否工作于当前设置频段 http://www.testdevgroup.com

  25. 使用CMD60进行DECT测试 Power Template Test http://www.testdevgroup.com

  26. 使用CMD60进行DECT测试 RF MODULATION Test http://www.testdevgroup.com

  27. 使用CMD60进行DECT测试 Timing Jitter Test http://www.testdevgroup.com

  28. 使用CMD60进行DECT测试 BER Test http://www.testdevgroup.com

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