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BÖLÜMÜ:BILGISAYAR ÖGRETMENLIGI -2

DIFFERENCES OF EXTERNAL MODEM

Modems establish connections between computers with telephone lines. Modems transform from digital data to anolog signal and viceverta. Modems have two kinds acconding to connection type. These are internal modems and external modems. External modems are more useful than internal modem, because of its sound quality, at a defect or new modem’s is put external modem is taken of easily, its indefendens of computer power, its electically safety [1].
External modems have better sound quality. External modem’s line noise is lower. So our working become easier. External modem prevents communication of parasite so it can supply more healty communication [2].
At a defect new modem’s is put external modem is taken of easily. Only cable’s taking out modem it isn’t necessary to open on turn off the computer. It is more advantage paint of time. Change of port is easy external modem [3].
External modem is electrically safety. External modem protect computer from high voltage on the telephone line. It can protect from thunder bolt danger [4].
External modem is independent of computer power. Its is a device which has its own power. So different power supply isn’t necessary for us. It is safe. External modem feeds from adaptor [5].
External modem is more expensive than internal modem. So we sometimes prefer internal modem. External modem overlays addition place, because it isn’t settled in computer [6].
We must be careful when we buy modem. At first time we must be careful modem’s speed. Modem which we buy it must support MNPL and V.42 standard of error correction. When we use external modem we fall from line fewer. So we work more confortable. It facilitotes working, because of this external modem is used fewer recently [7].

REFERENCES

[1].http:// www bilgisayardershanesi.com7modemler.htm,Bilgisayar ve Internet Kullanimi sayfa 44 Hasan Çebi Bal 2002,Akademisyen Yayincilik,
[2].Bilgisayar ve internet kullanimi sayfa 44 Hasan Çebi Bal, Akademisyen Yayincilik, Modern Donanim Mimarisi sayfa 217. Türkay henkoglu 2003 Pusula Yayincilik
[3].http:77www.odevsitesi.com7odevler7arsiv729551-modem nedir.htm,Bilgisayara Giris sayfa 49 Burhan Deniz 1996 Sürat Yayinlari.
Bilgisayar ve Internet Kullanimi sayfa 44 hasan Çebi Bal ,Akademisyen Yayincilik
[4].temel bilgi teknolojisi 2002 anadolu üni.yayinlari sayfa 37,Bilgisayar ve Internet kullanimi Hasn Çebi Bal sayfa 44 Akademisyen Yayincilik.
[5],[6].Modern Donanim Mimarisi sayfa 217 Türkay Henkoglu 2003 Pusula Yayincilik ,http:77 www.odevsitesi.com/odevler/arsiv /29551-modem nedir.htm.