Chapter 3 Operation - Cabletron Systems SmartSwitch 9500 Hardware And Installation Manual

Operation
The 9A656-04 provides switching between the front panel interfaces (ANIMs) and
the Cell Transfer Matrix backplane located inside the SmartSwitch 9500 chassis.
Figure 3-1 shows the trafÞc ßow of ATM cells in the 9A656-04. The following
sections brießy describe the functions of the i960 Processor, the ASICs, the CTM
and how they relate to ATM cell trafÞc ßow.
Separates/assembles
cell header data
Phycsical
UTOPIA
Connection
ASICs
ATM CELLS
to Network
Shared DRAM
CPU
i960
Provides management and
configuration interface for
the 9A656-04
CPU Interface
Translates headers and provides
routing information to move ATM
cells out of the TDM
CELL HEADER INFORMATION
ATM CELLS
Provides translation between
the I/O ATM bidirectional data
and the TDM
SAR
To SMB-1 & 10
To Z-80 Processor
Segments and reassembles
data into ATM cells
Figure 3-1. 9A656-04 Block Diagram
TDM
ROUTING INFORMATION
ASIC
Queue
DATA
ASICs
SARI
DATA
ASIC
Chapter 3
CTM
DATA
ASICs
DATA
3-1