- Plain Old Telephone Service. Regular old-fashioned analog loop start phone service. Repeaters, Boosters or Amplifiers - Used to "boost" (amplify) the signal when your distance from the central office exceeds 20 miles (33 kilometers). RJ-11 - Short for Registered Jack-11, a four- or six-wire connector used primarily to connect telephone equipment in the United States. Splitter - "Splits" the jack plug two or more ways to allow more than one
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