With all due respect, we have proven that the problem lies with TiVo. We monitored the MPEG TS with a Tektronix real time analyzer and found that every time the PAT version number changed indicating a program addition or deletion to the transport stream, TiVo macroblocked. The analyzer did not flag any MPEG protocol violations in the stream. As you pointed out previously... there is only one MPEG spec and everybody, including TiVo, Cisco and Motorola have to follow it. The brand of tuning adapter should have no bearing on the situation as its not involved in the mpeg transport stream decoding. I doubt that BigBand does anything different in its SDV server or edge QAM between a motorola plant or a cisco plant relative to TS generation.