The DTV742 processor allows cable operators to efficiently receive, groom, multiplex, and output four off-air 8VSB television signals in a single 1 RU high chassis. Four separate multiplexers are contained in a single DTV742 to provide four independent ASI outputs. The built-in multiplexer allows flexible user-determined combinations of input signals to the four ASI outputs. Each ASI output multiplexer my select, rename, and remap signals from one or more of the inputs. The same programs may be selected for simultaneous delivery to multiple outputs. The ASI outputs may be connected to 64 QAM or 256 QAM modulators for delivery to the digital cable plant. PSIP information is extracted and automatically recalculated to ensure that DTV signals are smoothly re-distributed over cable. Operations, such as assigning new program short names, major and minor channel numbers, and MPEG program numbers, can be entered through the web browser. User inputs are monitored by the DTV742 to inhibit entry errors and warn the operator of the errors.