Communications jacks including test circuits and related circuits and methods

A Network Interface Device comprising:

• first and second input terminals configured to receive an outside communications line;
• a plurality of outputs with each output comprising respective first and second output terminals wherein each output is configured to receive a respective inside communications line;
• a bus coupling each of the first and second output terminals with the first and second input terminals;
• an outside communications line bridge between the first and second input terminals and the bus providing coupling/decoupling to/from the outside communications line;
• and
• a test circuit between the outside communications line bridge and at least one of the outputs, the test circuit comprising a test switch configured to electrically couple respective first and second output terminals of the at least one of the outputs together, and at least one indicator configured to provide indication of a completed electrical circuit through the test switch and the respective first and second output terminals of the at least one of the outputs.