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DC/DC Converter
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 monitors and controls the operation of the DC/DC converter.
INB Interface
Each module that attaches to the INB has an INB Network Interface Block (NIB).
The INB NIB converts canonical frames to fixed length data blocks for
transmission onto the INB. For data blocks received from the INB, the INB NIB
reassembles the data blocks received from the INB back into canonical frames for
transmission to the Fast Packet Switch (FPS) then from the FPS to the front panel
ports.
Fast Packet Switch
The Fast Packet Switch (FPS) is a hardware based switch design that is the key
building block of the MMAC-Plus. All filtering/forwarding decisions are made in
hardware as opposed to software as in traditional bridges. This custom hardware
allows the FPS to process over 150K frames per second. The FPS is designed to
support up to 64 ports that are shared between the host processor, the INB
backplane, and LAN/WAN interfaces on the front panel of MMAC-Plus
modules. The FPS can operate in two modes; as a traditional bridge or as a
SecureFast Packet Switch (SFPS). When operating in bridge mode, it makes
filtering /forwarding decisions based on Destination Address (DA), with
standard IEEE 802.1d learning. When operating in SFPS mode, all
filtering/forwarding decisions are made based on a DA-SA pair and its receive
port. These DA-SA pairs with the associated receive port are programmed into
the switch using Cabletron’s Automated Connection Management System
(ACMS). This provides the network administrator with the ultimate network
security without the performance degradation found when using routers or
bridges with special filtering capabilities. The MMAC-Plus hub can support
modules operating in bridge mode and SFPS mode simultaneously providing
security when/where needed and ease of configuration where security is not
required.
i960 Core
The i960 core provides the SNMP protocol stacks, to support industry standard
MIBs. Additionally, Cabletron enterprise extension MIBs are supported for each
media type. Advanced management services, such as the Distributed LAN
Monitor, telnet and network address to MAC address mapping, are also provided
by the i960 core.