Extended error protected communication system.An extended consumer communication system uses a signal that is error protected by a block code. The generator polynomial isG.sub.n (x)=g.sub.o (x) . . . g.sub.n (x)which is factorizable, and each of the factors implement a linear and systematic code. Generally, each of the factors adds redundancy and raises the level of error protection. In this way, redundancy that is associated to a later term of the sequence occupies code positions that are protected by at least one earlier term in the sequence and may in consequence be used for positioning data that is protected by such earlier term, upon surrender of such higher protection level.