Problem of ATM adaptation layer

Well, please not only do ..problem of the ATM.. specialized subject and study the problem of the transmission exchange and the plant management hard the chief telecommunications engineer's of today study though it peels off ATM because it is an item of frequent occurrence.

Then, today's material is [kochira] ↓↓.



- ATM adaptation layer (AAL) type 5



The overhead when communicating compared with other AAL types is minimum because there are neither header nor trailers in cell splitting and assembly unpleasant sable (SAR) in AAL type 5.

These sentences are correct.
- The overhead when the AAL type 5= is communicated is minimum.
- There is AAL type neither the header nor 5= trailer (To SAR).



It differs from AAL type 3/4, and it mistakes and it detects it by cyclic check sign (CRC) in ten bits in each sequence number of the cell in AAL type 5.

These sentences are wrong.
- It mistakes only because of the CRC check of CPCS-PDU after the sequence number etc. of the cell are not used for the fault sensing, and the frame is assembled and it detects it.
- Each cell mistakes, it doesn't detect, each CPCS-PDU is mistaken because of the CRC check, and it detects it.



AAL type 5 can efficiently offer the voice and the image at a changeable speed in service class B of AAL to a high-ranking layer compared with AAL type 3.

These sentences are wrong.
- AAL type 5 is defined as an ATM adaptation layer to provide the voice at a changeable speed of service class B and the service of the image etc.
- ↑ Moreover, this explanation is unknown. ｡｡

- Because AAL type 5 is not connection OR connectionless "Class B" in class D because it is type VBR and "Class D", these sentences might be mistakes.



Well, how?The bytalk, I have the memory of the examination of the problem of this ATM in the document of the Cisco system well considerably and rolling it up. Because information is obtained on the site etc. where the qualification acquisition of the reference book of CCNP or Cisco was made a subject, I think it is good when looking over once when it is not good though it is not thought that the technical book of the ATM system is found to be an almost good. Then, around here today