Today's topic is an ATM.

Well, chief telecommunications engineer's examination measures are done today. The problem related to the ATM thinks the subject of the transmission exchange and the plant management for you should make efforts and to finally exist because it is set questions at excellent frequency this time though it is a problem of a special field that tentatively handles a lot by this blog though it is a problem related to the ATM. Then, today's material is [kochira] ↓↓.



- ATM layer service

CBR is service that provides PCR(Perk Cell Rate), and guarantees CTD(Cell Transfer Delay), CDV(Cell Delay Variation), and the cell loss ratio.

These sentences are correct.
- CBR (Constant Bit Rate: constant bit rate): PCR (peak cell rate) is provided, and it is suitable for forwarding service and circuit switching services that guarantee CTD (cell transfer delay) and CDV and the cell loss ratio.



It doesn't make amends for the cell loss ratio though VBR is service to which SCR(Sustainable Cell Rate) and MBS(Maximum Burst Size) besides PCR are provided, and an image forwarding and an accumulative voice/data communication that uses the changeable speed sign assume it.
These sentences are wrong. - VBR (Variable Bit Rate: changeable speed service): SCR (average cell rate) besides PCR (peak cell rate) and MBS (maximum burst-length) are provided, and there are two categories of nrt-VBR for rt-VBR and the accumulation communication for serve real-time communication to which an image forwarding and an accumulative voice/data communication that uses the changeable speed sign are assumed and the cell loss ratio are guaranteed. - "The cell loss is secured. " though there are rough sentences.



It is a file transfer and service that is appropriate for the application of the transmission of the non-real-time data of E-mail etc. though not warranted the quality basically by UBR.

These sentences are correct.
- UBR (Unspecified Bit Rate): The file transfer and it serves that is appropriate for the application of the transmission of the non-real-time data of E-mail etc. though it doesn't warrant the quality basically.



ABR is to be adjusted the speed to install between MCR and PCR after MCR(Minimum Cell Rate) is secured by using RM cell (Resource Management Cell) to convenient service for the user who wants to use the bandwidth of becoming empty as much as possible.

These sentences are correct.
- From to install between MCR and PCR after MCR is guaranteed by using the transmission speed and RM (resource management) cell of the band that can be used, the speed is adjusted ABR (Available Bit Rate: bit rate that can be used): to convenient service for the user who wants to use the bandwidth of becoming empty as much as possible it.



How? It is confused and it divides, and refer the font color of the becoming it part in "Red", please the point the frequent occurrence of the term that looks like though it is a problem of the ATM (asynchronous transfer mode) though instigating it. An easy-to-use a little more in case of preserve it in the text editor or Excel duck because this blog is not thought to be terrible the table because right and left width of the article is narrow and to see easily. Then, around here today.