Talk:Virtual circuit

From Wikipedia, the free encyclopedia

Hi,

to my knowledge TCP is NO "virtual circuit protocol". A virtual circuit ist virtual as there is np real circuit between the endsystems. X.25, Frame relay and ATM are VC networks. A VC is characterized by the fact that a permanent circuit is built in the connection process. This includes finding the route between the endsystems, and each router on the path allocates a bandwidth for the circuit, i.e. the routers between are holding state information for the circuit!

For reference I quote "Computer Networking: A top down approach featuring the Internet " by Kurose.

Christian

There must be a misunderstanding in this article.

I quite agree with Christians opinion here, by my knowledge the "Virtual Circuit" is the states theese switchs are holding, and it will never change while the circuit is in use, as opposed to TCP which is a Datagram network which may choose different paths at each package.

Ivan


TCP is a connection-oriented packet mode protocol, which to my understanding is synonymous to virtual circuit switched. It is carried by a connectionless datagram protocol the IP protocol, but that is another story... . Mange01 09:13, 28 June 2007 (UTC)
I have now completely rewritten the article, in view to further clarify the above. Mange01 19:35, 30 June 2007 (UTC)


The first paragraph is badly mixed up, and badly wrong. A virtual circuit has nothing whatsoever to do with the protocol being a packet, a byte-stream, or a bit-stream oriented protocol. Virtual circuits exist in all 3 types of protocol. "A virtual circuit protocol hides the division into segments, packets or frames from higher level protocols." is completely wrong. TCP is a connection-oriented byte-stream protocol, not a connection-oriented packet mode protocol. TCP is also a Virtual Circuit protocol, but the two are not synonymous. 81.187.162.109 20:18, 21 July 2007 (UTC)

[edit] PVC, ADSL modem

No mention here of PVC as it applies to ADSL (except the reference to QOS). Since most (?) ADSL modems have the capacity to set up PVC's for QOS or other reasons, and typically come with no explanation, a brief description of meaning of the acronyms, PVC,VPI,VCI,UBR,CBR,VBR,PCR,SCR,MBS,CDVT, relevant standards, and common values would be useful. —Preceding unsigned comment added by 150.101.166.15 (talk) 08:09, 4 June 2008 (UTC)