Cabletron Systems MMAC-Plus 9A000, User Manual

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3-5
Switch Hardware
3.2 Switch Hardware Components
3.2.1 Switch Board
The switch board (also referred to as the “switch fabric”) contains the VPI/
VCI lookup tables and routing circuitry to ensure that a cell received from an
input port is correctly switched to one or more output ports. The SFCS-
200WG, and the SFCS-200BX each come with one switch board. The
SFCS-1000 can be populated with as many as four switch boards. Each switch
board can accept up to four network modules, which themselves can contain
up to six ports each. The switch board also has an interface, controlled by the
SCP, that is functionally equivalent to an ATM host interface.
3.2.2 Switch Control Processor
The i960 SCP in the SFCS-200WG, SFCS-200BX, and the SFCS-1000 provide
the distributed connection setup for a network of ATM switches. The SCP pri-
marily provides management access through SNMP and is responsible for
storing and updating all SNMP management information. Additionally, the
SCP has direct access to the switch board. The SCP, and associated software,
manages the behavior of the switch board (i.e., connection setup), but is not
involved in the actual cell switching.