The DDW-220 is an Industrial Ethernet SHDSL extender with a built-in Ethernet switch. It is designed as a transparent Ethernet Extender for 10/100BaseTX networks and is the ideal solution for extending Ethernet networks over copper cables where in the past the only option would have been fibre.
The Ethernet Extender has two SHDSL interfaces and can therefore be used to create a multidrop network. With its built in four-port Ethernet switch the DDW-200 need be the only unit required to build a complete Ethernet solution.
The DDW-220 is built around four different circuit boards. The backplane connects to a power board, CPU board and a DSL board. All communication between the boards are made via the backplane. The power board converts the external voltage (16–60 V) to internal voltage levels. The power board also has a high level of protection circuits to handle power disturbances in a harsh environment.
The DSL board consists of two separate SHDSL lines with state of the art DSL chip technology. Each DSL chip supports G.SHDSLbis making it possible to communicate at up to 5,7 Mbit/s over long distances. Each DSL line interface is protected using an over-voltage/over-current protecting circuit (TBU) making it possible to deal with noise on the DSL lines and still maintain communication.
The CPU board handles all communication within the DDW-220 and also controls all switching between Ethernet ports and DSL ports. The switch-core mounted on the CPU board supports wire speed communication between all Ethernet ports. The complete unit is encased in a high quality housing making it possible to handle harsh EMI environments and extreme climatic conditions.
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