It wasn’t that long ago that telephone companies did not have much to worry about when it came to rolling out services. This was mainly due to the fact that incumbent local-exchange carriers (ILECs) provided primarily POTS, or plain old telephone service. Back then, all the copper wire had a straightforward purpose: to carry voice energy a certain distance with an acceptable quality of service. And in fact, the design rules that were (and still are) used provided a great level of service for its intended purpose – telephony. The same held true for the portion of the loop that entered the building, namely, a simple requirement for providing clear voice service.
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