Chief Transmission and Switching Engineer(JP

Let's do study and measures of "Telecommunication chief engineer examination" where a good teaching material doesn't exist though the examination contents is advanced little by little.

2010/09/21

About VP and VC of the ATM

Yes, I think that today's chief telecommunications engineer's material also goes by the ATM. In today's problem, virtual passing VC is a virtual channel in VP in VP and VC of the ATM. Is VP (virtual pass) a virtual transmission line in short and it only have to be thought the transmission line of the ATM and SDH?It is a group of a logical virtual line that mutually connects the edge tune. VC (virtual channel) is a road to put it briefly as shown in data. A few VC can be passed through one VP and good transmission of efficiency can be done. Then, today's material is [kochira] ↓↓.



- VP of ATM (virtual passing) and VC (virtual channel)



In the sending terminal, the VCI value in which the receiving terminal that is the address is indicated directly is set to the VCI field of the ATM cell.

These sentences are wrong.
- VCI doesn't indicate the address directly. VCI decentralization only arranges and is used only to distinguish the channel that each cell belongs in the done each switch.
- Only the VCI value shows the channel, and even the terminal is not shown.



In the method of setting VC, there is PVC method set like the SVC method and the lease line, etc. of the setting at each communication based on the contract.

These sentences are correct.
- Method of setting only SVC = to communicate, and liberating virtual channel with end of communication
- Method of assuming virtual channel to be to be remain set for a long term by PVC = contract etc.



In the ATM network where the VP crossing connection was used, VC is set with the ATM switch in the terminal of VP.

These sentences are correct.
- Naturally, the setting of VC is a switch in the terminal of VP.



VC accommodated by VP besides VC accommodated by a certain VP of the output port of the ATM switch can use the same VCI value.

These sentences are correct.
- Yes, it is possible to use it.



さて、いかがでしたか?明日からの週末も気を抜かずに伝送交換の勉強がんばってくださいね。それでは今日はこの辺で。

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