s*g
2 楼
8 bytes if control word is implemented (4 bytes control word + 4 bytes
original header). Why asking? at least it is obvious to me.
original header). Why asking? at least it is obvious to me.
z*r
3 楼
why is it 4byte from original header instead of 5?
【在 s*****g 的大作中提到】
: 8 bytes if control word is implemented (4 bytes control word + 4 bytes
: original header). Why asking? at least it is obvious to me.
【在 s*****g 的大作中提到】
: 8 bytes if control word is implemented (4 bytes control word + 4 bytes
: original header). Why asking? at least it is obvious to me.
s*g
4 楼
You don't need CRC, CRC has to be recalculated, right? Let me check check RFC.
s*g
5 楼
Found the quote:
"In the ATM reference model, the cell header is only 4 bytes long at the ATM
layer. The Transmission Convergence (TC) sublayer calculates and appends
the fifth byte (header error control [HEC]), which is a checksum of the ATM
cell header in the ATM physical layer. The TC sublayer handles functions
such as cell delineation and error detection and correction by adding a 1-
byte CRC. Because cell relay acts in the ATM layer, and for alignment and
efficiency reasons, the HEC byte is
"In the ATM reference model, the cell header is only 4 bytes long at the ATM
layer. The Transmission Convergence (TC) sublayer calculates and appends
the fifth byte (header error control [HEC]), which is a checksum of the ATM
cell header in the ATM physical layer. The TC sublayer handles functions
such as cell delineation and error detection and correction by adding a 1-
byte CRC. Because cell relay acts in the ATM layer, and for alignment and
efficiency reasons, the HEC byte is
z*r
6 楼
thanks so much, this is exactly what I need. btw, which RFC are you
referring to?
ATM
ATM
the
【在 s*****g 的大作中提到】
: Found the quote:
: "In the ATM reference model, the cell header is only 4 bytes long at the ATM
: layer. The Transmission Convergence (TC) sublayer calculates and appends
: the fifth byte (header error control [HEC]), which is a checksum of the ATM
: cell header in the ATM physical layer. The TC sublayer handles functions
: such as cell delineation and error detection and correction by adding a 1-
: byte CRC. Because cell relay acts in the ATM layer, and for alignment and
: efficiency reasons, the HEC byte is
referring to?
ATM
ATM
the
【在 s*****g 的大作中提到】
: Found the quote:
: "In the ATM reference model, the cell header is only 4 bytes long at the ATM
: layer. The Transmission Convergence (TC) sublayer calculates and appends
: the fifth byte (header error control [HEC]), which is a checksum of the ATM
: cell header in the ATM physical layer. The TC sublayer handles functions
: such as cell delineation and error detection and correction by adding a 1-
: byte CRC. Because cell relay acts in the ATM layer, and for alignment and
: efficiency reasons, the HEC byte is
s*g
7 楼
I did not search RFC, I just googled "ATM cell-relay CRC AToM", it is a
Cisco link, but the actual RFC is 4905 section 5.2.2
Cisco link, but the actual RFC is 4905 section 5.2.2
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