Transcript DECT Test Mode

DECT 原理与测试介绍
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DECT介绍
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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
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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”
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PABX数字程控交换机
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)
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DECT Technical Summary
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DECT Technical Summary
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DECT Technical Summary
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DECT Technical Summary
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DECT Technical Summary
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DECT Technical Summary
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DECT Technical Summary
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How does DECT work?
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How does DECT work?
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How does DECT work?
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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。
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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]
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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]
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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.
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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]
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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.
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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
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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
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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.
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若要测试南美频段则需安装K61扩展选件.
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
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使用CMD60进行DECT测试
Power Template Test
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使用CMD60进行DECT测试
RF MODULATION Test
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使用CMD60进行DECT测试
Timing Jitter Test
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使用CMD60进行DECT测试
BER Test
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