Patent ID: 7944900

Claim:
A modulator/demodulator comprising: an interface to: terminate a physical layer transmitting multiplexed data, received at the modulator/demodulator from a particular station in a mobile communication system, wherein first data units, of the multiplexed data, are destined for the modulator/demodulator and second data units, of the multiplexed data, are destined for another modulator/demodulator, each of the data units having an associated virtual path identification (VPI), transfer the first data units to a first processor and a second processor, and transfer the second data units to the first processor and the second processor; the first processor comprising: a first VPI filter to discard the transferred data units having an associated VPI that differs from a set value assigned to the modulator/demodulator; and the second processor comprising: a second VPI filter to identify the transferred data units having an associated VPI that matches a set value assigned to the other modulator/demodulator.