Abstract: A fiber to curb and telecommunications T1 carrier overvoltage protection apparatus includes a pair of semiconductor junction breakdown crowbar devices connected in series between TIP and RING telephone lines, and a reverse standoff voltage breakdown zener-type device connected between ground potential and a junction connection of the series connected semiconductor junction breakdown crowbar devices.

Abstract: A telephone line overvoltage protection method and assembly are provided. The telephone line overvoltage protection assembly includes a telephone line station protector having at least first and second threaded arrester wells coupled to a telephone line pair to be protected, an adapter base, and a plug-in type telephone line overvoltage protector module mounted to the adapter base and having TIP, RING and ground pins. The adapter base includes TIP, RING and ground sockets for removably receiving the TIP, RING and ground pins of the overvoltage protector. First and second mounting legs project from the adapter base for being fixedly inserted into the first and second threaded arrester wells. First and second electrodes extend from the first and second mounting legs for electrical connection with the TIP and RING sockets and the arrester wells.

Abstract: An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential. The first voltage clamping circuitry is formed by at least a pair of solid-state protective chip devices and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid-state protective chip device and providing a ground connection for the pair of solid-state protective chip devices. A pair of current limiting resistors operatively connected to the failure mode mechanism provide sneak current protection.

Abstract: A telephone line overvoltage protection method and device are provided. An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential; second voltage clamping circuitry for clamping voltage signals on the lines at a second predetermined voltage potential. The second voltage clamping circuitry includes filter circuitry for filtering the voltage signals when the voltage signals exceed the second predetermined voltage signals. The first voltage clamping circuitry is formed by a solid state protective device and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid state protective device.