Cabletron Systems MMAC-Plus 9T125-24, User Manual

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3-5
Operation
DC/DC Converter
The DC/DC converter converts the 48 VDC on the system power bus to the
necessary operating voltages for its host network services module. The diagnostic
controller controls the operation of the DC/DC converter.
FNB Interface
SmartSwitch 9000 modules are designed with one of two attachment options. One
allows a module to dual attach to either FNB-1 or FNB-2; the second allows dual
attachment to both FNB-1 and FNB-2. The 9T125-24 has one dual attachment to
the FNB backplane, connecting to either FNB-1 or FNB-2. The module can insert
into the FNB or bypass it. These flexible configuration options make the
SmartSwitch 9000 ideal for networks designed to switching multiple lower speed
LANs to FDDI and/or networks designed using an FDDI collapsed backbone.
i960 Core
The i960 core in the FNB module serves two major functions: it provides the
packet forwarding logic and performs all network management services. FNB
modules can be configured to run as layer 2 bridges, layer 3 routers or as
SecureFast Packet Switches. It is possible to run the bridging and routing options
concurrently, but the SFPS option cannot run with bridging and routing.
The i960 core provides the SNMP protocol stacks, as well as support for industry
standard MIBs. Additionally, Cabletron enterprise extension MIBs are supported
for each media type. Advanced management services, such as the Distributed
LAN Monitor, RMON, telnet and network address to MAC address mapping, are
also provided by the i960 core.