In reply to dave_59:
Insertion of error bits to the fixed 1000 bit frame makes it different for each.
Totally 10 Errors, so each error is nothing but Frame of 1000 bits + Error bits injected. Error bits should not be injected consecutively.
For example:: in Error 1 pattern, 1000 bits are injected with 5 error bits which are not consecutive.
In error 2 pattern, 1000 bits are injected with 7 error bits , and so on