STC 105 Phone Line Manager
This module checks the standard telephone line for correct voltage and current. The output is activated if voltage and/or current are out of specification or not present. One set of outputs is a DPDT form "C" relay. The other output is an optical isolator which may be configured for either N.O. or N.C. output functions. Direct switching to backup line can be accomplished with the on-board relay.  
Price - $41.00 each   View the specifications for this product in PDF format here. (right click on link and "save as" to download the file).

 

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