MODEM ??

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MODEM ?? BITLAND
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?? ??MODEM?? ?? PCI
MODEM????? ??????? ??????????LAYOUT????
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??MODEM??
4
? ?

• ?????56K????MODEM
• ??ISDN?ADSL MODEM?CABLE
  MODEM?

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? ? ? ?

• RS-232C
• ISA
• PCI
• USB
• PCMCIA

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??????(PCI)

• SOFT MODEM
• HARD MODEM

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??PCI MODEM?????
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PCI MODEM????
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PCI MODEM????
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PCI MODEM????
???MODEM???,???????????
???????/??????? ??????,??MODEM??????
????????????????,??MODEM??????
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PCI MODEM????
MODEM????????? MODEM????? ????????????????????
? HARD MODEM????MODEM???????? SOFT
MODEM????CPU???????,????????MODEM????? ???
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PCI MODEM????
HARD MODEM??? ??Modem???????????????Mod
em????,??Modem????????????
????????????????????,???DOS????
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PCI MODEM????
SOFT MODEM??? ??MODEM??????????
??????????
?????MODEM?????,???MODEM??????????????(?????
?????????)?
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PCI MODEM????
SOFT MODEM??? ??????PCI???,?????PCI????
??,????????? ?????????"??"????????,???????????????
? CPU???,???????????????????DOS?????"??"?
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PCI MODEM????
?????Modem ??Modem??????,???????????,?
??????????,???????????? ??????????????,????????,??
??????
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???????
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MODEM???
???? ???? ??????(?????) ????
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???????????
???? ITU-T V.92 V.90(56,000bps),
K56Flex(56,000bps), V.34(33,600bps),
V.32bis(14,400bps), V.32 (9600/4800bps),
V.22bis (2400bps), V.22, V.21(300bps),
V.23(1200bps/75bps) Bell 212A(1200bps),
103(300bps)
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???????????
???? V.42 ????,?LAPM????,??? ?MNP2-4????
MNP2-4 ?Microcom????????
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???????????
????(Data Compression) V.42bis
??????,??BTLZ(British Telecom LempelZiv)???Dynamic
String Dictionary,????????????,????????
MNP5 ??????,?Microcom????????? V.44????
21
???????????
???? ???????????????????????,???????
??????,???????????????????????????????????????????
????????????
22
???????????
???????????? ASCII?????????,??????????
Xmodem?????????????,??????CRC??????,?????????99.
6? Ymodem??Xmodem????,???1024?????,???Xmodem??
?
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???????????
???????????? ZmodemZmodem??????(str
eaming)????,??????,???????????????????????????????
????????????? ??????,??Imodem?Jmodem?Bimodem?Ker
mit?Lynx???,??????????
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????
ITU-T V.17(14400bps) V.29(9600/7200/4800bps)
V.27ter(4800/2400bps), V.21(300bps) EIA/TIA
578 Class 1 and T.31 Class 1.0
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??????(?????)
ITU-T V.80
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????
?????? ???? Speakerphone AudioSpan
(ASVD) DSVD(??)
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ASVD
??ASVD???????????????DSVD??????????????SVD???????
????,??????,???ASVD? ASVD??????????????/????????
??????????(?33.6K Modem??,????14
16KHz)??????,???????????(17.6 19.6KHz)??????????
???????EPROM?Flash ROM???????????,???????,????????
??????????????,??????,????????,????????
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DSVD
DSVD??Hayes?Rockwell?U.s.Robotics?Intel????1995?
???????????,????V.42????????DSVD????DigiTalk??????
???????,?Modem????????????????????????
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DSVD
DSVD????MODEM???????????????,?????????????????,?
??9600Kbps??????????,??????????,??????????????????
?????ASVD???????,??????,????????
ASVD?DSVD??????????,???ASVD?ASVD??,DSVD?DSVD????
??????????????
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V.90????
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V.90??
?? ???????????40??,???????????????????
???????????????,Modem?????????,??????33600bps,????
????????????????????,???????????????????????????
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V.90??
?? 1996??,?????????Rockwell(?Conexant??)?Lu
cent?U.S.Robotics(1997??3Com????)??????????56K
Modem???????Rockwell????????????K56Flex??,?U.S.Rob
otics??????X2??,???????
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V.90??
?? 1998?2?,ITU?X2?K56Flex?????????,????
?56K??V.90??? V.90?????Internet?????????????
?PSTN???????,??????????????????????
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V.90??
?? ???????????,56K V.90????????????33.6
Kbps,????????ISP??????????48?52Kbps??,????????????
56K??????? ????? V.42bis???????,V.90???????
???????
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V.90??
??MODEM????? V.90???????,??MODEM??????????
??(PSTN)???56Kbps???????? ?????????????MODEM?
???
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V.90??
PSTN????????????? PSTN?????????????????
?????????????????,???????????????,????????????????
??????????????,?????????????
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V.90??
????????????? ?????PSTN???,??????????????
??????????8000?/??????,?????????????PCM(Pulse
Code Modulation) ????????256????8?PCM????????????
,??????????,????PSTN??????????????????????????????
???????????????????,????Modem????
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V.90??
??????? ?????????,?????????????35kbps????
?????????-?????,?????-????
???V.90????????V.90???? Modem?PSTN????-???,??????
????????????????????255???????,????????????????Mod
em????,???????????????
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V.90??
V.90Modem?? ????,???????????????????????
?????????????? ??????,V.90Modem??????????????
??????-??????V.90 Modem??????-???,???V.34?????????
?Modem???V.90???,V.90??Modem???????V.34???
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V.90??
??V.34?? V.34Modem???-?-???????????,???
?????????????,V.34Modem?????????????????V.34modem?
?????,??????????????????????????????V.34??????????
???????????(ADC)???????????
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V.90??
???(SNR)??? ????????????????,??????????
????????,????????,?????????????????????,????????-?
???,????????38-39dB,????V.34????????33.6Kbps???
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V.90??
V.90Modem?? V.90 Modem???????256???????
,??????8000PCM?/??????????????,????????64Kbps(8,00
08bits/code)? ??????????????????????
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V.90??
??MODEM?????? ??,??????????????,??DAC??
?????????????????????????????????????????????????

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V.90??
??MODEM?????? ??,???????(DAC)????????,?
?????????(????U?,???????A?)???????,????????PCM????
???DAC??????,?????????PCM???????DAC???????
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V.90??
??MODEM?????? ???????256???PCM????????,?
??????????DAC????????,????????????????????????
(??????PCM?????DAC????)? ??,V.90?????256????????,
???????????DAC???????,????128??????56K??92??????5
2K??,? ??????????????????,???????????
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V.90??
V.90??????????? ???????????
V.90????????????,?"??"?????T1,ISDNPRI/BRI???
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V.90??
V.90??????????? ???????V.90??
?????,???????Modem?????????????ModemPool,?????V.
90???
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V.90??
V.90??????????? ????????-???
?V.90??modem?V.90??modem?????????????,??????-????

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V.90??
???????
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V.90??
???56k MODEM????56kbps? ? ? ? 33600
Modem ? ? ? ?, ? ? ? ? ? ? ? ? 33600 bps ?
???56K MODEM,56K ? ? ? ? ? ? ?, ? ? ? ? ? ? ?
50000 bps ? ? ? ?? ? ? ? ? ? ? 52000 bps , ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ?, ?? ? ? ? 36000 bps ?
??? ? FCC( ? ? ? ? ? ? ? ? ? )Rules ? ? ?? ? ?
FCC ? ?, ? ? ? ? ? ? ? ? ? ? ? ? ?, ? ? ? ??
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V.90??
??????????115200bps??
????Modem??????????,??????DCE???DTE???
DCE?????Modem?????????????????????,DCE???Modem????
???,????v.34bis???Modem??????33600bps?DTE?????Mode
m?????????????????DTE???????DCE??,???Modem????????
????
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V.90??
?????? ????MODEM?????( Flow
control)???????????????????????????????MODEM??????
?????,??????MODEM??????,??MODEM??????????,????????
??????,??MODEM?????????,?????????????????MODEM???,
??,MODEM??????????,??????,??MODEM????????
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V.90??
????????????? ???????????????????????
?,???????????? ?????,??????RTS???????MODEM?
??,????????MODEM???CTS???????????,?????????
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V.90??
????????????? ???????RTS?CTS??,???????
???XOFF????????,??XON????????,??????,????XON/XOFF?
??TD???MODEM?MODEM???,XON/XOFF???RD???????
?????????????????,????????????????????
?????,????????
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V.90??
MODEM?ID???????? MODEM?ID?4?,???? Device
ID16-bit,????????? Vendor ID
16-bit,???????????? Subsystem ID
16-bit,???????????? Subsystem Vendor ID
16-bit,????????? ??BF1648?ID???? VEV-11C1DEV-0
44ESUBSYS-044011C1REV-02
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???????????
? Microcom ???? MNP ??, ? 10 ?,????? 1 5 ?,
???? MNP5. MNP1 ?? "???,???,????"??????. MNP2
??. MNP3 "???,??,????" ????? MNP4 ??
APA,DPO ????,???????? 120 MNP5 ??????,?????
200 MNP6 ?????,???????? MNP7 ????,???
300 MNP8 ??? MNP9 ???????? MNP10
????????,???? ??, CCITT ??????????, ???? CCITT
v.42 ????????????? CCITT v.42bis????????
400 ?? v.42?? MNP2MNP4 ??(????????), ? v.42bis
? MNP5 ???(???????), ?????????, ???????, MNP5
???????? 200, v.42bis ???????400, ???????, ????
100 ?, v.42bis ??????????, ?MNP5 ???? ?????
MODEM ?, ?? v.42bis ? MNP5 ??????
??,??????????,?????????????,??????, ???????
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V.92????
???56k Modem?????V.90??,???????????
Quick Connect ???????(Hand
Shake)????????10?,????56k Modem(V.90
Modem)????20??
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V.92????
Modem-on-Hold ?????Modem?????????,?????
16???Modem????.?????56k Modem??????,???????????

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V.92????
PCM Upstream ????(????ISP)??????????48
kb/s?????56k Modem??????33.6kb/s??????????????????
????Web????????????????????????????PCM(??????)???
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V.92????
PCM Upstream PCM??????????64kb/s(8b
it8kHz)?56k Modem????????????56kb/s,?????????????
?8bit???????bit?????V.92???????????48kb/s,????????
??A-D?????????????????
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V.92????
??????????V.44 ?????V.42bis??,??????25??
????Web??,????????1/6???,????(???)???300kb/s?
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????????? LAYOUT????
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??????? LAYOUT????
????? 1)PCI??????,??????????
?????????. 2)????????.
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??????? LAYOUT????
??????? 1)????. 2)????.
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??????? LAYOUT????
????? 1)PCI??????,???????. 2)?????????PCI
?????. 3)EEPROM???????. 4)????.
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??????? LAYOUT????
??????? 1)DRIVER ??. 2)????. 3)DSP???.
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??????? LAYOUT????
????,???? 1)AFE??????,AFE???. 2)??????,????
. 3)????. 4)????????. 5)LINE ?
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??????? LAYOUT????
???,????,???? 1)???????. 2)AFE??,?????. 3)
????. 4)????. 5)LAYOUT??
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??????? LAYOUT????
???? 1)LINE ?? 2)LAYOUT ?? ????
????.
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?Modem?????
MRModem?????,???????? TR??????? SDModem???????
RDModem??????? OH????,Modem??????? CD????,Mode
m???????? RIModem????????,??Modem?AA??? HS????,?
???9600?
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THANK YOU!