Telephone Butt Sets
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Telephone Butt Sets
![Telephone Butt Sets Telephone Butt Sets](https://www.specialized.net/media/catalog/category/sc_te-buttsets.jpg)
Butt sets from Fluke Networks, Tempo Communications and other top brands offer caller-ID, voltage/ current indication, polarity detection and other testing features. They also allow technicians to butt in on a live DSL line to test POTS quality without downing the data service.