if it's a g(black) or a j(gray) dsu then you need a computer, db9 connector, usb to serial connector, hyperterminal. depending on if it's a 408, 816, 1632, you may find a com port 1 directly on it or there should be a jack coming off the amphenol cable which is what you plug in off the db9. best off calling someone who works on them it should be a 5 minute job take longer to turn on the laptop haha.