DECT??

1
DECT??

• What is DECT?
• Wireless Cordless Telecommunication Standards
• DECT Technical Summary
• How does DECT work?
• DECT????????
• DECT????
• ??CMD60??DECT??

2
What is DECT?

• DECT Digital Enhanced Cordless
  Telecommunications(????????) ??DECT?Digital
  European Cordless Telecommunications
  (????????)???,?????DECT?????????European ??
  Enhanced.
• DECT??CT2?CT3?????????????
• DECT ???????1992? - ETS 300 175 and ETS 300 176
• DECT?????DECT6.0
• DECT???1880MHz?1900MHz ????GFSK????.
• DECT?????
• PSTN,ISDN,Wireless PABX,etc.
• CT2??????????? CT3???????????
• PSTN ?????? ? ISDN????????????,??????? PABX?????
  ??

3
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)

4
DECT Technical Summary
5
DECT Technical Summary
6
DECT Technical Summary
7
DECT Technical Summary
8
DECT Technical Summary
9
DECT Technical Summary
10
DECT Technical Summary
11
How does DECT work?
12
How does DECT work?
13
How does DECT work?
14
DECT????????

• FP Fixed Part ????. ??DECT Base Station?
• PP Protable Part ????,?????DECT Phone
• DECT Test Mode ?DECT?????FP????????????????,????
  ?FP???????,???????????.
• GAP Mode ?GAP Mode???????????????,????????????
  ?????DECT????????GAP Mode.
• Dummy Bearer ?FP??PP?????.Dummy
  Bearer??FP??PP?10ms???PP?,??????????.
• Slot Dummy Bearer ? Traffic Bearer ? Slot
  Number ?????? 0 11,???????.?????Slot(?? 5,6 ?
  11,0)??? Dummy Bearer ? Traffic Bearer ?channel
  number ??????????FP???????Slot,???????????Slot????
  ?Traffic Slot?????
• RFPI Radio Fixed Part Identity
  ?????????FP,??PP???RFPI Number?FP?RFPI????????????
  
• PMID Protable Part Mac Identity
  ?????????PP,???FP????????????PMID,??PMID??????????
  ?FP?????
• PARK Protable Access Rights Key
  ?????????PP???????FP???????
• IPUI International Protable User Identity
  ?PP???????,?????FP???PP???????????????FP???????
• NTP - Normal Transmit Power ???????

15
DECT??

• DECT????
• 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????
• Anritsu - MT8801B Radio Communication Analyzer
• RS CMD60/CMD65 Digital Radiocommunication
  Tester
• RS TS1220 DECT Protocol Tester
• RS PTW15 DECT Signalling Test Unit
• Agilent 8923A DECT Test Set Obsolete
• Agilent 8923B DECT Test Set Obsolete

16
DECT????

• Accuracy and stability of RF carriersTBR06-07
• DECT ????
• 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
  parametersTBR06-08

17
DECT????

• Transmission burstTBR06-9
• 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 templateTBR06-9.4
• 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.

18
DECT????

• RF carrier modulation TBR06-11
• Max B-Field ModulationTBR06-11.3.2
• The peak values of the modulation deviation
  measured over the B field that maximally and
  minimally deviate from the frequency offset.

19
DECT????

• 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.

20
??CMD60??DECT??

• CMD60??????
• TX Frequency Accuracy 3 kHz
• TX Level Accuracy at RF IN/OUT lt1.5 dB
• TX Level Accuracy RF OUT2 5 dB
• Accuracy of Power Measurement at RF IN/OUT
• lt 2.5 dB in the range 30 to -10 dBm
• lt 3 dB in the range -10 to -50 dBm

21
??CMD60??DECT??

• 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
22
??CMD60??DECT??
???? RFPI PMID TRAFFIC SLOT TRAFFIC CARRIER RF
LEVEL MODE
?????????????????, ????CARRIER OFFSET
??? ???????????????. ????????????K61????.
23
??CMD60??DECT??

• ????????????SETUP CONNECT????.
• ????????????????????.

?????????????. ???????????????? 1.????????,RF????
?? 2.??????????? 3.?????????????
24
??CMD60??DECT??
Power Template Test
25
??CMD60??DECT??
RF MODULATION Test
26
??CMD60??DECT??
Timing Jitter Test
27
??CMD60??DECT??
BER Test