The TP3155 is a monolithic CMOS logic circuit designed to generate transmit and receive frame synchronization pulses for up to 8 COMBOTM CODEC Filters Each frame sync pulse may be independently assigned to a time slot in a frame of up to 32 time slots Assignments are controlled by loading in an 8-bit word via a simple serial interface port This control interface is compatible with that used on the TP3020 TP3021 and 2910 2911 CODECs enabling an easy upgrade to COMBO CODEC Filters to be made