Overview Tripp Lite's N152 series Telco cables are ideal for telephone, PBX, and IP Phone system applications. Constructed with 26AWG, solid conductor, Cat3 rated cable, and heavy duty metal backshells with Male to Female, RJ21, 50 pin connectors. EIA/TIA 568B color coded conductors. The N152 cable is only available in stock lengths of 25ft ( N152-025-C3)