And on a side note. Don't bother wasting your time plugging a T-BERD or any other T1 test set up to an HDSL span with the intent on it taking errors by sending a certain stress pattern. Those stress patterns were developed to troubleshoot a purley digital facility with its associated loop electronics and wiring(ie* T-1). Sending differnet patterns of 0's and 1's isn't going to make a difference to the analog waveform of the HDSL span. The only reason to connect a BERT device to a DS1 circuit being transported on HDSL 2/4 is to troubleshoot the wiring and electronics on either side of the HDSL span and line-coding and framing options.
