These are standard jitter test cards with a band of jitter starting at any specified location after the beginning of the start sentinel (default = 10 bits). Jitter is present on both 1's and 0's with different combinations of data before and after the jittered bit. Virtually all data dependencies are represented. These data dependencies allow full exercise of the analog electronics and F2F decoder in your card readers. Bit-to-bit jitter as well as subinterval jitter is tested.