The TISP61089A is a dual forward-conducting Terminals K1, K2 and A correspond to the alternative buffered p-gate overvoltage protector. It is line designators of T, R and G or A, B and C. The negative protection voltage is controlled by the voltage, designed to protect monolithic SLICs (Subscriber VGG, applied to the G terminal. Line Interface Circuits) against overvoltages on the telephone line caused by lightning, a.c. power contact and induction. The TISP61089A limits voltages that exceed the SLIC supply rail voltage. The TISP61089A parameters are specified to allow equipment compliance with Bellcore GR-1089-CORE, Issue 1.