Importance

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Abstract

A redundancy system for co-channel telecommunications comprising a first modem comprising a premapped symbol interface (PMSI) ROM configured to produce a constellation point number (CPN) value for each transmitted symbol using FEC codewords and a modulation format, an encoder to produce three CPN value signals, and a first symbol clock to generate a timing signal for the data signal. The system further comprises a second modem comprising a PMSI ROM decoder to decode the CPN values from the received CPN value signals, an interface bus to transmit the three CPN value signals of the encoder and the timing signal from the first online modem to the second offline modem, and a redundancy switch to switch the input channel of data to a FEC encoder of the second modem and the output channel of received codewords to a FEC decoder of the first modem in response to a redundancy switching signal.

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First Claim