Ethernet LAN's increasingly are used where small groups of high-availability nodes at the network edge need to be connected into larger LAN structures. The ESD42-Series, a versatile family of small Edge Switches, use new dual-homing unmanaged switch networking technology (patent pending) and innovative product packaging to serve redundant edge-of-the-network applications.
What is Dual-Homing? In Ethernet LAN's, dual-homing is a network topology that adds reliability by allowing a device to be connected to the network by way of two independent connection points (points of attachment). One connection point is the operating connection, and the other is a standby or back-up connection that is activated in the event of a failure of the operating connection.
The compact ESD42 Dual-Homing Edge Switch design delivers 6 Ethernet ports, two of which (ports 1 and 2 for dual-homing) may be either fibre or copper and are reserved for use in connecting the ESD42 into the upstream network. The other 4 ports are auto-negotiating auto-cross RJ-45 ports for attachment of critical nodes that need a high-availability network connection. fibre port choices cover all multi-mode and single-mode fibre connector types.
ES42 and ESD42 Edge Switches, combined with managed switches running STP or RSTP or S-Ring, provide high-availability LAN's at lower total cost than was previously possible. Identical in physical construction to ES42 Edge Switches, the ESD42 Edge Switches are similarly available in regular (office), Hardened (factory floor), and Premium-rated (outdoor) versions. The ESD42H Hardened units are for factory floor applications.
The ESD42H models are built with high-grade components and are constructed using special thermal techniques (patent pending) and a metal case for heavy-duty industrial jobs. In addition to a Hardened AC power option and jack, terminals for internal DC power choices at 8 to 15V, 24V or -48V DC are included. Two terminals provide connections to monitor an internal power-sense relay. The ambient temperature rating is for industrial use. No internal air flow is required for cooling, so it resists dust, dirt, moisture, smoke and insects. Mounting choices include standalone panel-mounting, DIN-Rail, or rack-mount tray.
The ESD42P Premium-rated units are for temperature uncontrolled sheltered applications, typically located outdoors. The ESD42P models are built with premium-grade extended temperature components, and use similar thermal techniques (patent pending) as the ESD42H Hardened units. In addition to a Premium- rated AC power option and jack, terminals for the power-sense relay and for internal DC power choices at 8 to 15V, 24V or -48V DC are included. When used outdoors, the ESD42P should be sheltered from the elements. Mounting choices include stand-alone panel-mounting, DIN-Rail, or rack-mount tray.
All ESD42 Dual-Homing Edge Switch models come with two sets of LED indicators. One set is on the front for viewing convenience when the unit is DIN-Rail or wall-mounted, and one LED set is mounted in the end adjacent to the ports for easy viewing when units are in a rack-mount tray. The ESD42 Dual-Homing Edge Switches and other products are designed and manufactured in the USA and backed by a three-year warranty.