Patton 1004A

Patton 1004A ... duplex) twisted pair, and still supports async data rates up to 115.2 kbps. It also passes data plus one control signal in each direction, just like the Model 1004. However, the Model 1004A now gives you more flexibility, with extra configuration parameters: two separate high/low impedance settings, "echo" on/off and selectable RTS/CTS delay are now standard, as well as selectable carrier control and a DCE/DTE switch. Also standard on the new Model 1004 is 600 watts per wire of Silicon Avalanche Diode surge protection. The Patton Model 1004A - it's the same short haul you've come to depend on, only better!