LevelOne MSL-3S79 - Manual (Page 7)

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Chapter 1 Introduction
The MSL-3S79 is a modular switch that can be used to build high-performance
switched workgroup networks. This switch is a store-and-forward device that offers low
latency for high-speed networking. The Switch is targeted at workgroup, department or
backbone computing environment.
The MSL-3S79 features a “store-and-forward” switching scheme. This allows the
switch to auto-learn and store source address in an 16K-entry MAC address table.
MDI (Medium Dependent Interface) Port is also called an "uplink port". The MDI port
does not cross transmit and receive lines, which is done by the regular ports (MDI-X
ports) that connect to end stations. In general, MDI means connecting to another Hub
or Switch while MDIX means connecting to a workstation or PC. Therefore, Auto
MDI/MDIX means that you can connect to another Switch or workstation without
changing non-crossover or crossover cabling.
The MSL-3S79 has 3-module slot. User can purchase the modules in accordance with
their needs as well as giving elasticity on network application.