If the pair is split, the tone will remain strong when the wires are shorted. Splits can also be isolated using a lineman's test set with the Tone Test Set. Refer to your lineman's test set instructions for details. A rolled pair results when the tip and ring leads are reversed in connecting to the network. This may be done while splicing or installing a device.
Proper polarity is essential for proper operation of some tone dials.
A roll will not affect rotary dialing. If a true tone telephone set does not produce tone beeps when the keypad is pushed, polarity may be reversed. If a push button set produces dial pulses when the keypad is operated, the set is not really a tone set. When the keypad is operated, numbers are pulsed out just like a standard rotary dial. The Leviton Tone Test Set is equipped for polarity testing with a visual indicator.