You might not think about your cell service indicators on a day to day basis, but in an emergency you need to know what they ...

Part 68 of the FCC's (Federal Communications Commission) telecommunications regulations requires that certain signaling equipment connecting directly to the public-telephone network must present a ...

Many ‘busy’ indicators for use in telephone systems present undesirable loading of the telephone line. Some circuits are very simple indeed to the extent of only loading the line when it is not in use ...