Flow Of Atm Cells - Nortel 1200N User Manual

Flow of ATM Cells

Flow of ATM Cells
4-2
„ Network management system interface
This unit exchanges maintenance information with the network management
system.
The flow of ATM cells is as follows:
1.
Cells sent over lines are received by the line cards.
2.
The line cards generate switching information from the VPI, VCI, and PT in
the cell header.
3.
The switch/CPU card outputs cells to the line cards corresponding to the
destination lines.
4.
A line card that receives a cell converts the VPI, VCI, and PT in the cell header.
5.
Cells are sent to the destination lines.
As an ATM switch, the switch/CPU card time-division multiplexes ATM cells from
the four line cards, uses AFs (address filters) to sort the input ATM cells according
to the destinations in their headers, then sends the ATM cells to the line cards. In
addition, the switch/CPU card is equipped with a CPU and has an interface with
MAT or NMS to perform hardware control, path connection control, and protocol
control.
Figure 4-1: ATM Switch
Hardware Specifications
Centillion 1200N ATM Switch User Manual
NTP 297-8103-903