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Модемы и факс-модемы

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?aoa?ao ii eioi?iaoeea

O/aieea 11 “A” eeanna

Aeaenaaiei Ieeieay

Oaia :

Iiaeaiu e oaen-iiaeaiu.

Nianeai ca aieiaiea !

03.10.1995 a.

Oeiea # 1278, ee. 11 “A”.

Iiaeaiu e oaen-iiaeaiu.

I?e ninoaaeaiee ?aoa?aoa auea eniieueciaaia eieaa Oeiu ?aoaii “Iiaeaiu
aeey /aeieeia”.

Iiaeai – ono?ienoai, iicaieythuaa eiiiuethoa?o auoiaeeoue ia naycue n
ae?oaei eiiiuethoa?ii iin?aaenoaii oaeaoiiiuo eeiee.

Oaen-iiaeai – iiaeai, iicaieythuee oaeaea i?eieiaoue e iinueaoue
oaeneieeueiua niiauaiey.

Ii naiaio aiaoiaio aeaeo e ianoo onoaiiaee iiaeaiu iiae?acaeaeythony ia
aioo?aiiea e aiaoiea. Aioo?aiiea iiaeaiu i?aaenoaaeytho niaie
yeaeo?iiioth ieaoo, onoaiaaeeaaaioth iaiin?aaenoaaiii a eiiiuethoa?, a
aiaoiea – aaoiiiiiia ono?ienoai, iiaeniaaeeiyaiia e iaeiiio ec ii?oia.
Aiaoiee iiaeai noieo, eae i?aaeei, iaiiiai aei?iaea aioo?aiiaai oiai aea
oeia ec-ca aiaoiae i?eaeaeaoaeueiinoe ( eiaeeeaoi?u, ?aaoeyoi?
a?iieinoe) e aieaa eaaeie onoaiiaee.

Iniiaiie ia?aiao? a ?aaioa iiaeaia – nei?inoue ia?aaea/e aeaiiuo. Iia
ecia?yaony a bps (aeo a naeoiaeo) e onoaiaaeeaaaony oe?iie-
i?iecaiaeeoaeai a 2400, 9600, 14400, 16800, 19200 eee 28800 bps. Eiiaaea
anoa/athony onoa?aaoea iiaeaee iiaeaiia (300 e 1200 bps), ii iie oaea
i?aeoe/anee auoee ec oiio?aaeaiey. Naaiaeiy aeinoaoi/ii oi?ioei iiaeaiii
n/eoaaony iiaeai ni nei?inoueth 14400 bps (ieiei 1 Mb a 10 ieioo), e aai
iiaeii i?eia?anoe i?eia?ii ca $150.

Oaeaea aaaeiuie iieacaoaeyie a nia?aiaiiuo iiaeaiao yaeyaony iaee/ea
?aaeeia ei??aeoeee ioeaie e ?aaeeia naeaoey aeaiiuo. Ia?aue ?aaeei
iaania/eaaao aeiiieieoaeueiua neaiaeu, iin?aaenoaii eioi?uo iiaeaiu
inouanoaeytho i?iaa?eo aeaiiuo ia aeaoo eiioeao eeiee e ioa?anuaatho
iaia?ee?iaaiioth eioi?iaoeeth, a aoi?ie naeeiaao eioi?iaoeeth aeey aieaa
auno?ie e /aoeie aa ia?aaea/e, a caoai ainnoaiaaeeaaao aa ia iieo/athuai
iiaeaia. Iaa yoe ?aaeeia caiaoii oaaee/eaatho nei?inoue e /enoioo
ia?aaea/e eioi?iaoeee, iniaaiii a ?inneeneeo oaeaoiiiuo eeieyo.

Iaeia ec ia?aaeiauo oe?i- i?iecaiaeeoaeae iiaeaiia “Hayes Microcomputer
Products” i?eiyea iniiaiua noaiaea?ou aeey eiiaiae iiaeaiia, aeeth/ay
iaai? AT- eiiaiae, n iiiiuueth eioi?uo iieueciaaoaeue iiaeao
iaiin?aaenoaaiii oi?aaeyoue ?aaioie iiaeaia. Naaiaeiy Hayes-noaiaea?oaie
iieuecoaony iiaeaaeythuaa aieueoeinoai oe?i ai anai ie?a e eo/oea
iiaeaiu yaeythony Hayes- niaianoeiuie.

Oaeaea nouanoaotho ie?iaua noaiaea?ou nei?inoe iiaeaia, naeaoey aeaiiuo
e ei??aeoeee ioeaie. Yoe noaiaea?ou onoaiaaeeaathony eiieoaoii ITU-T
(noaiaea?o CCITT) e oe?iie Microcom (noaiaea?o MNP). Naiua eo/oea
iiaeaiu niioaaonoaotho iaiei yoei noaiaea?oai.

Naiua ?ani?ino?aiaiiua noaiaea?ou CCITT naaiaeiy:

noaiaea?o nei?inoe 9600 bps – V.32 e nei?inoe 14400 bps – V.32bis;

noaiaea?o ei??aeoeee ioeaie – V.42;

noaiaea?o naeaoey aeaiiuo n eiyooeoeeaioii 4:1 – V.42bis.

Iniiaiua noaiaea?ou ia?anueee oaeneieeueiuo niiauaiee – Class 1 e Groop
IV, iiaeaea?aeeaathuea nei?inoue aei 19200 bps e naeaoea aeaiiuo.

Nae/an ia ie?iaii ?uiea iiaeaiia oaeoe/anee i?aayo 2 oe?iu : ZyXEL e

US Robotics. Iie i?iecaiaeyo naiua nei?inoiua e naiua ea/anoaaiiua
iiaeaiu e oaen- iiaeaiu. I/aiue aei?iaea noia?nia?aiaiiua iiaeaiu ZyXEL
eiatho aiciiaeiinoue aini?iecaaaeaiey aieina, caienaiiiai a oeeo?iaii
?aaeeia e naeaoey ?a/aauo neaiaeia, /oi iicaieyao eniieueciaaoue eo a
ea/anoaa aaoiioaao/eeia. Oaeaea iaeioi?ua iiaeaee ZyXEL U-1496 e US
Robotics Courier niaaaeaiu ia?aeeth/aoaeai ?a/ue/aeaiiua, ano?iaiiui
oanoe?iaaieai e ae?oaeie iieaciuie ooieoeeyie. Iniiaiia ea/anoai
iiaeaiia ZyXEL – eo aei?iaiaecia (aei $1250) e aiaaoaeoee auai?
aiciiaeiinoae, a iiaeaiia US Robotics (Courier e Sportster) –
iaaeaaeiinoue e ioiineoaeueii ieceay oeaia ia ieo (aei $200).

N?aaee iiaeiie iineaaeieo eao a ie?a iiaeaiia iiaeii oaeaea auaeaeeoue
niaoeeaeueiua iiaeaiu aeey Notebook’ia, iinoaaeyaiua ia ieaoao oeia
PCMCIA. Yoe ieaou i/aiue oaeiaiu naiae eiiiaeoiinoueth, iie iicaieytho
eiiiuethoa?o ia ioaeaaaoue naiaiaeiue COM-ii?o iiae aiaoiee iiaeai, ii
ana aea iie iiiai aei?iaea, /ai iau/iue iiaeai.

Iineaaeiea aiaeu ni?in ia iiaeaiu e oaen-iiaeaiu noae aeinoaoi/ii
aunie, o.e. iie iaiaoiaeeiu i?aeoe/anee eaaeaeiio ?aaioathuaio ia
eiiiuethoa?a /aeiaaeo. Iiaeaiu iicaieytho aeinoaoi/ii auno?i
ia?aaeaaaoue n iaeiiai eiiiuethoa?a ia ae?oaie iaeaou aeieoiaioia e
naycuaaoueny ii yeaeo?iiiie ii/oa, a oaeaea iaania/eaatho aeinooi a
aeiaaeueiua ie?iaua naoe (Internet e ae?.) aeey onoaiiaeaiey eiioaeoia n
ca?oaaaeiuie ia?oia?aie.

I?eia/aiea:

CCITT – Comite Consultatif International de Telegraphique et
Telephonique

MNP – Microcom Networking Protocol

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