A multimode PCM transceiver chip for 1.544-Mbit/s digital telecommunications

A 1.25- mu m CMOS VLSI device that converts the popular 1.544-Mb/s T1 format used in digital telecommunications to a 4.096-Mb/s system format is described. The transmit and receive functions are implemented with a RAM, a 3088-bit shift register, and 33 K transistors.<
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