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ADSL Nasıl Çalışır?
Cuma, 26 Ocak 2007
ADSL Nasıl Çalışır?
ADSL sisteminde, bilinen bakır kablolama alt yapısı kullanılır. Telefon hattının her ucuna bir ADSL modem eklenerek 3 bilgi kanalı oluşturulur: Alış (download), gönderiş (upload) ve POTS (Plain Old Telephone Service – Düz Eski Telefon Hizmeti) olarak adlandırılan geleneksel telefon servis kanalı. POTS kanalı, ADSL ortamı üzerinden ses iletimi için kullanılır. Böylece internete bağlı iken aynı anda telefon konuşması yapılabilmesi sağlanmış olur. Geleneksel modemler, bilgisayardan gelen sayısal sinyalleri analog sinyallere, telefon hattından gelen analog sinyalleri de sayısal sinyallere çevirir. ADSL’in de içinde yer aldığı DSL teknolojisi, sayısal verinin analog forma ve tekrar geriye çevrilmeyeceğini varsayan bir teknolojidir. DSL modemleri sinyalleri çevirmez bunun yerine verileri sayısal olarak yollar ve alır. Sinyalleri çevirmeye gerek kalmadığından veriler normal modemlerden çok daha hızlı iletilir. Sistem asimetrik olarak çalıştığından download (şebekeden kullanıcıya) ve upload (kullanıcıdan şebekeye) hızları farklıdır. Her zaman download oranı upload oranından fazladır. ADSL bağlantı, hat uzunluğu, kullanılan bakır kablonun çapı ve kullanılan modemin tipine bağlı olarak 8Mbps’a kadar download (şebekeden kullanıcıya), 1Mbps’a kadar da upload (kullanıcıdan şebekeye) veri hızlarına olanak verir.
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