Premium Phantom Cables T1 Cross Over DB15 Female to DB15 Female 2pr 100ohm spool 1000ft The speakers are secured with The speakers are secured with auto locking mechanisms and can be installed in both residential and commercial applications Physical Characteristics Color White Length 100 foot Nominal Size 3 4 inch Sleeving Type Split Hook & Loop Braided Hook & Loop Width 5 8 inch Packaging Information Type Sold on Spool Product Weight 1 This T1 cable is constructed using two pair shielded T1 rated cable and consists of DB15 female connector on both ends It is designed to be used specifically for T1 telecommunication applications where cross over wiring is required