Rockwell T-1 Communication Chip Silicon Wafer - R8070, Transceiver, 4", 100mm

About T-1 Communication Lines   Introduced in the 1960s, AT&T's T-1 carriers were the first high-speed, long-distance digital communications lines. The T-1 would allow 24 64Kbs data channels to be transmitted over two phone company twisted copper wire pairs. The total bandwidth was 1.5Mps. In the 1980s and 1990s, T-1s were the basic building blocks of the Internet. In the early 1980s, Rockwell introduced the first LSI computer chips that dramatically reduced the number of devices needed and the costs required for building T-1 transmitting and receiving equipment. The chips on this wafer were R8070 T-1 transceiver chips. These advanced chips could transmit and receive T-1 signals. The chip below the wafer is a completed R8070 chip mounted in a QUad-Inline Package (QUIP).   About Voice Communications and T-1 Lines This four-inch silicon wafer was made by Rockwell International in 1984. The R8070 wafer has about 138 R8070 chips on it. The right 1/3 of the chip is the transmitter logic