View source for DESVA VAXstation 2000 / MicroVAX 2000 ThinWire Ethernet Option

The '''DESVA''' Ethernet controller option module enables the connection of a [[VAXstation 2000]] or [[MicroVAX 2000]] system to an [[Ethernet]] network via a [[ThinWire]] connection using [[RG-58]] coaxial cable. 
The option is packaged on a 4-inch by 7-inch board that is located in the system unit and plugs into the two DESVA option connectors (J5 and J14) on the [[KA410 MicroVAX 2000/VAXstation 2000 System Module]]. 
The DESVA module is powered by the system box power supply. The DESVA contains a [[Local Area Network]] Controller for Ethernet (LANCE) chip, a serial interface adapter (SIA) chip, and a [[ROM]] that contains device-driver programming, and supports logic circuitry. The Ethernet transceiver chip, Ethernet address ROM, and the [[BNC]] connector for the RG-58 cable to the Ethernet are mounted on the system module. The network components on the VAXstation 2000 / MicroVAX 2000 system module are inactive until the DESVA option module is installed. 

The DESVA network module is an option on the MicroVAX 2000 system but comes standard in the VAXstation 2000 system.
[[#ref_1|[1]]]

[[File:DESVA_Ethernet_option_module.JPG|400px|thumb|left|DESVA VAXstation 2000 / MicroVAX 2000 ThinWire Ethernet Option Module]]

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== References ==

 <div id="ref_2">[1] VAXstation 2000 and MicroVAX 2000 Technical Manual. EK-VTTAA-TM.001</div>

[[Category: DEC Network Interfaces]]
[[Category: Ethernet Interfaces]]