Chapter 1: Introduction
1.42E4X-27 OVERVIEW
The 2E4X-27 is a 27-port high-speed network switching device that supports traditional switching (bridging) and Cabletron Systems SecureFast Switching Virtual Network technology. Ports 25 and 26 support optional Fast Ethernet Interface Modules and can provide uplinks to 100BASE-TX or 100BASE-FX Fast Ethernet networks. Port 27 supports an optional High Speed Interface Module (HSIM) that provides additional connectivity to various networking technologies such as Asynchronous Transfer Mode (ATM) and Fiber Distribution Data Interface (FDDI).
The 2E4X-27 is used to connect individual high-bandwidth user devices, such as workstations, and provides a central switching point for multiple Ethernet segments built using devices such as Cabletron Systems HubSTACK or other third party stackable devices.
The 2E4X-27 is a tabletop unit that can be installed in a standard 19-inch rack using the supplied rack mounting hardware.
The 2E42-27 and 2E43-27 have one universal ac power supply with automatic voltage sensing that allows operation using 100–125 or 200–240 Vac, 50/60 Hz.
The 2E42-27R and 2E43-27R have two power supplies. The power supplies load share 50% (+/-5%) of the power required by the device. If one power supply fails, the remaining power supply assumes the entire load of the device without interruption to network traffic. Each power supply module supports its own ac input connection, which allows the user to connect each power supply to a different ac power circuit.
1.4.1Connectivity
Connectivity for ports 1 through 24 is different for the 2E42-27/2E42-27R and the 2E43-27/2E43-27R.
The 2E42-27/2E42-27R connects to Ethernet networks or workstations through 24 RJ45 ports on the front panel. These ports support Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP) cables at lengths up to 100 meters. The ports are IEEE 802.3 10BASE-T compliant.
The 2E43-27/2E43-27R connects to Ethernet networks or workstations through two 50-pin RJ21 connectors. Each connector is wired for 12 ports.
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