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Untitled Document
Wireless Local Loop (WLL)
โดย Support วันที่ 13/05/2552 17:09
 

???? Wireless local loop (WLL) ?????????????????????????? 2 ??? (Two-way Communication) ???????????????????????????????????????????????????? ? ???? WLL ????????????????????????????????????????????????????????????? local loop ??????????????? copper ???????????????????????????????? (Public Switched Telephone Network: PSTN)  ????????? WLL ?????????????????????????????????????????????????????????? ????????????????? ???????????????????????????????????  WLL ???????? ????????????? ?????????????????????????????????????????? ????????? WLL ??????????????????????????????????????????????????????????


???????????? WLL

  1. ??????????????????????????????????????? ??????????????????????????????????????????????????
  2. ???????????????????????????? ???? WLL ????????????????????????? Wire line local loop ??? ??????????????????????????????????????????????????????????????????????????????? (mobility-related services) ?????????????????????????????????????????????????
  3. ???????????? WLL ?????????????????????????????????????? ??????????????????????????????????????
  4. ???????????????????????????????????????????????? 2-6 ????? ??????????????????????????????????????????????????? 90 ??????????? ?????????????????????????????????????????????????????????????????????????????????????????? 70 ???????????

 
???????????????????????

  • ??????????????????
  • ???????????????????????? (???????????????????????????????????)
  • ???????????????????
  • ??????????????????? (???? ??????????????????????)
  • ??????????????? ISDN (??????????????????????? [BRA] 2 B + D = 144 kbps)  ?????????  ISDN ???????????????? 2 ?????? ???

      1) ???????? (Basic Access Interface 2B+D ???? BAI)
      2) ??????????? (Primary Rate Interface 30B+D ???? PRI)

1) ???????? (Basic Access Interface 2B+D ???? BAI)

????????????????????????????????????????????????????????????????? ISDN ????????????????? ?????????????? 1 ????????? ??????????????????????????????????? ????????????????????????????????????????????????????????? B 2 ?????????? ???????????????????????-????????? 64 Kbps ????????????? D 1 ?????????? ???????????????????????-??? 16 Kbps (????????????? B ????????????-???????????????? ????????????? D ???????????????????????????????????????????? (Connect) ???????????? (Release) ?????????????????????????????????????????? ?????????????????????????????????????????? Packet ???????????????????-?????????????????????????? BAI ??? 144 Kbps ????????-??????????????????????????????? 3 ???? ??????????????? ???????????????????????????????????? ?????????? BAI ????? 1 ??????????????????????????????????? ? ????????????????????????? 1 ??????? (???????????????? 8 ??????? ?????????????????????????? 2 ??????? ??????????????????)

?????? WLL ???????????? ISDN ????????????? (Basic Access Interface 2B+D ???? BAI) ????????????????

2) ??????????? (Primary Rate Interface 30B+D ???? PRI)

???????????????????????????????????????????????????????????????? ????????????????????????????????????????? ?????????? B 30 ?????????? ???????????????????????????????? 64 Kbps ????????????? D 1 ?????????? ???????????????????????-??????????????????????????? 2,048 Kbps ??????????????????????????????????? IS PABX ??????????????? ????????????????????????? IS PABX ?????????????????????????? ?????? ??? ???????? ?????????????????????? ISDN  ????????????????????????????????????????????????? ISDN ???????????????????????????????????????????????????????????????????????????????? ? ???????????????????????????????????? ISDN ??????????????????

  • ?????????????????????????????????????????? ???????? ISDN ????????????? ???? Computer Telephone, FAX G. 4
  • ?????????????????????????????????????????????????? ISDN ??????? ?????????????????????????????????????????????? ISDN ???? Computer, FAX G. 4, Telephone Network , Teleconference

 
??????? WLL architecture


?????: www.guru-ict.com

 
 
Untitled Document
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