Abstract: A method and system for logical multicasting on an Asynchronous Transfer Mode (“ATM”) switch. There is a logical replication of cells on the same physical port of the ATM switch. A block of consecutive CIs is used by the controller in the switch to create new cells. The CIs are used to control the flow through the switch and for updating the VPI and VCI.

Abstract: A digital data correlator is provided which detects the presence of a particular sequence, or correlating pattern, of binary data bits in a serial binary data stream, is tolerant of data errors, and is adjustable to accept different numbers of data errors. The correlator includes a shift register of the CMOS type, a plurality of inverters of the CMOS type connected to selected outputs of the register at which bits of a particular logic value are expected for a properly positioned correlating pattern in the register, and a plurality of like-valued resistances coupled to the outputs of the register and to the inverters. Erroneous bits in the register cause an error voltage to be produced at a common node point coupled to the resistances. The value of the error voltage is compared in a comparator against a threshold reference voltage of a value related to an acceptable number of erroneous bits.