What is the recommended cable for TW?
22 AWG twisted pair, braided sheilding (for mobile applications). 22 AWG 4 conductor, twisted pair, foil sheilded, and a ‘drain’ wire for permanent installations. This will reduce both capacitive and resistive crosstalk and help to reduce RF and electrostatic interference. For more information, please refer to the Handbook of Intercom Systems Engineering (Figure 1), page 38.