Ag Communication Systems Corporation

Lucent Technologies Inc.

Christopher A Pawlowski

John Spenik

Randall L Brown

James F Hoff

Thomas J Buege

Keith M McDonald

A system that provides additional voice lines with data over a single two-wire subscriber loop. At the subscriber premise, one or more telephone instruments and data devices are connected to a digital modem into either a voice or a data interface. Analog voice signals are PCM sampled then packetized, and voice and data packets are transmitted to a CO modem over the subscriber loop. The CO modem depacketizes the voice packets into PCM format and transmits PCM voice information to a CO switch over a standard digital trunk interface. Data packets are routed to a data network. Voice packets are given transmission priority over data packets to ensures that voice is transported in the presence of data with low latency.

System for multiple voice lines with data over a single subscriber loop

A digital transmission framing system utilizing an address array containing pointers to a framing pattern reference register. The address array contains an entry for each set of possible framing bits. Pointer values reference the last bit of a consecutive-bit sub-pattern of the reference register that the previously received bits in this frame bit position have matched. As data bits are received, the associated pointer value is incremented by one to point to the next bit of the reference register, and the received data bit is compared to the newly referenced reference register bit. If the received data bit matches the newly referenced reference register bit, the associated pointer is updated with the incremented value and the corresponding frame bit position of the received data bit remains a candidate for the actual framing bit position. This matching operation continues until only one eligible framing bit position is identified in the input data frame. Bit 0 of the framing bit pattern in the transmission stream is then identified and a synchronization signal is generated.

Digital transmission framing system

A data conversion circuit that acts as an interface between components or systems having different data input/output rate requirements. A circuit reads data transmitted at one bit rate and transmits data consisting of the input data along with overhead data interleaved with the input data in a fixed pattern at a faster bit rate. Also disclosed is a circuit that operates to read data at a faster bit rate and transmit data consisting of the input data stripped of interleaved overhead data at a slower bit rate. Data is written into and read from a register array that allows data to be concurrently and independently written and read. A suitable delay is introduced on the output side in order to avoid read/write collisions in the register array and achieve a minimum transmission delay.

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Phoenix, AZ, United States of America

Christopher A Pawlowski