Towermax DS/2 Module MDS2-60 Towermax DS/2 for digital station lines. For protection of 4-wire digital station lines. Protects two DS lines per module, RJ-45 jacks (pins 3,4,5,6 protected). Features auto-resetting solid state sneak current protection. Use with Towermax base unit. Includes (2) 7 foot RJ-14 phone cords. Clamp level 70 Volts.