Mds260 Towermax Ds/2 For Digital Station Lines. For Protection Of 4wiredigital Station Lines. Protects Two Ds Lines Per Module Rj45 Jacks (pins 3 4 5 6 Protected). Features Autoresetting Solid State Sneak Current Protection. Use With Towermax Ksu Base Unit. Includes Two 7foot Rj14 Phone Cords.clamp Level 70 Volts.