US 5,854,794 AGranted

Digital transmission framing system

AssigneeAG Communication Systems Corporation

InventorChristopher Andrew Pawlowski

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Abstract

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.

Claims6

Dependent claims

A digital transmission framing system including a source of a predetermined framing pattern, and a source of an input signal comprising data and framing information, said framing system comprising:

means for pattern matching connected to said input signal source and said predetermined framing pattern source, said pattern matching means operated to compare said input signal information to said predetermined framing pattern, and generate a match signal when a portion of said framing pattern matches a portion of said input signal;
means for storage connected to said pattern matching means, said storage means operative for storing a plurality of framing pattern pointer values, each pointer value indicating the portion of said framing pattern to which said input signal information corresponds;
means for pointer update connected to said pattern matching means and said storage means, said pointer update means operated in response to each match signal to update the framing pattern pointer value associated with said portion of said input signal to indicate the next contiguous portion of said framing pattern;
and
a framing counter operated in response to said match signal to output a frame aligning signal thereby indicating which of said data and framing information is framing information.

2 more elements

Dependencies are inferred from the claim text.