Lightning, electrostatic discharges, ground surges and faulty wiring send surges along your network lines, causing glitches, lock-ups and hardware damage on your computer system. Tripp Lite Network Surge Suppressors end the threat of dataline surges. Installed directly at your data ports, they protect your computer’s delicate internal circuitry with up to 300% more surge absorbing power than competitive models. DTEL2 protects two line Dial-Up connections, and it is ideal for modems, faxes, answering machine, etc.