Towermax - Towermax LLT1
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This is an add-on module for the Towermax 4 or 8 KSU base modules.
This unit allows you to protect 2 T1, ISDN, or leased lines. Pins 1,2,4,5,7,8 are protected. The unit features auto-resetting technology, PTC resistors open when a surge occurs, but once the surge has passed, they close again! Two RJ-48S cords are included.