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This soft copy for use by IBM employees only.
Figure 10. Hardware Architecture of the IBM 8285 Nways ATM Workgroup Switch Base
and Expansion Unit
When the IBM 8285 expansion unit is installed, its switch chip, called a
switch-on-a-chip, becomes the primary cell switch for the 8285 system. The
CAD_up and CAD_down devices in the base unit and in any ATM modules link
directly to this switch. Another way of saying this is that the link between the
base unit′s CAD_up and CAD_down is disabled, and all cells (even port-to-port)
within the base unit or within an individual ATM module, are switched through
the switch-on-a-chip.
Chapter 3. Functional Overview of the IBM 8285 21