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(2) VCC, multi-cast
Figure 3-30. Flow of Header Translation in VCC and Multi-Cast Modes
<1>
Input Cell
<Procedure>
<1>
Area-A is accessed by using a logical input port number, Input-VPI, and VCI = 20h.
<2>
Information about the VC connection (SM = 0) is obtained.
<3>
Area-A is accessed again by using a logical input port number, Input-VPI, and Input-VCI.
<4>
Multi-cast (CM = 1), pointer to Area-B (MBP), broadcast count (NMP), and service class (SC) are obtained.
<5>
SM, CM, and MBP are stored in the cell buffer along with the payload of the input cell. The cell address is
stored in the multi-cast queue.
<6>
Area-B is accessed by using MBP before re-queuing, and the logical output port number to be cast is
obtained. At this time, the cell address is stored in the output queue.
<7>
Area-B is accessed again when the cell is output, and the OVPC information on each logical output port is
obtained.
<8>
VPI and VCI of the output cell header are set from OVPC.
CHAPTER 3 FUNCTIONAL OUTLINE
HTT
Area-A
Area-B
<3>
<6>
<2>
Input-VPI, VCI
SM (= 0)
Separation
Combination
Payload
<5>
<4>
<7>
CM (= 1), OVPC
Combination
<8>
VPI and VCI are obtained from OVPC.
Cell Buffer
SM CM
MBP Payload
Part that manipulates the header
Output Cell
69
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