What are the differences between a TDS820 (STD) and a TDS820 with option 1D?

What are the differences between a TDS820 (STD) and a TDS820 with option 1D?

The TDS820 in its standard configuration has internal delay lines and trigger pickoffs which enables the TDS820 to have internal triggers. With the internal delay lines, the BW is 6Ghz.

A TDS820, option 1D, has the internal delay lines removed. This improves the BW from 6Ghz to 8Ghz. However, there internal trigger function no longer works. A trigger source needs to be applied to the external trigger input.