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VIRTUAL CIRCUIT

Last update: 10/31/2012 12:23:00 AM

Yazan:Fatih KABAKCI

Katmanlar arasında haberleşme için kullanılan servislerin yanı sıra,sanal devre adında bazı servisler kullanılabilir.Bu tür servisler bağlantılı paket anahtarlama(connection-oriented packet switching) olarak anılır.Switched virtual circuit ve Permanent virtual circuit olmak üzere iki tür sanal devre bulunur.

Hatırlanacağı üzere Devre Anahtarlamalı Ağlar(Circuit Switched Networks) bir connection-oriented servis olup,Paket Anahtarlamalı Ağlar(Packet Switched Networks) ise bir connectionless servistir.Virtual circuit ise gönderici(transmitter) ve alıcı(receiver) arasında kurulan ve bu iki sistemi referans alan bir sanal devredir.



Gönderici ilk olarak bir veri iletişimi gerçekleştirmek için alıcı ile bağlantı kurar.Bu bağlantı sanal devreyi kurmak için gereklidir.Ancak bu paketlerin denetim bilgileri içerisinde adres bilgileri yoktur.Sanal devre için üretilen sanal bir devre numarası,paketlerin doğru adreslere iletilmesi için kullanılır.Bu numaralara VCI(Virtual Circuit Identifier) adı verilir.Gönderilen paketler,alıcıya gönderildikleri sırada ulaşırlar.Network alanındaki router'ler ise alıcı node adres bilgileri yerine,bu VCI numaralarını tablolarında tutarak paketleri doğru noktalara iletirler.

İletişim sonucunda gönderici virtual path üzerinden call termination göndererek transferi bitirir.
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