Dc/Dc Converter; Inb Interface; Securefast Switch - Cabletron Systems 9F426-02 User Manual

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 SmartSwitch ASIC then from the SmartSwitch ASIC to the
front panel ports.

SecureFast Switch

The SmartSwitch ASIC is a hardware-based switch design that is the key building
block of the SmartSwitch 9000. All filtering/forwarding decisions are made in
hardware, as opposed to software as in traditional switches. This custom
hardware allows the SmartSwitch ASIC to process over 150K frames per second.
The SmartSwitch ASIC 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 SmartSwitch 9000 modules.
The SmartSwitch ASIC can operate in two modes: as a traditional switch, or as a
SecureFast Switch (SFS). When operating in traditional switch mode, it makes
filtering/forwarding decisions based on Destination Address (DA), with standard
IEEE 802.1d learning. When operating in SmartSwitch ASIC 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 SecureFast Virtual Network Server (SecureFast
VNS). This provides the network administrator with the ultimate network
security without the performance degradation found when using routers or
traditional switches with special filtering capabilities. The SmartSwitch 9000 hub
can support modules operating in traditional switch mode and SmartSwitch ASIC
mode simultaneously providing security when/where needed and ease of
configuration where security is not required.
Operation
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