The PD170 is FW 400. Therefore you'll either need a 4 pin FW400 --> 9 pin FW800, or a 4 pin 400 --> 6 pin 400, and then a 400 --> 800 adapter.
I was recently looking over some PD150 footage from 11 years ago. SD, but the quality is very high. That was a hell of a camera, and the 170 I suppose is a bit better.
Second the Monoprice suggestion.