GC-506-030 Boston N-Series instrument cable PC-20-15H Boston patch cables PC-220-15 Boston Black Jack patch cable PC-220-50 Boston Black Jack patch cable PC-225-15 Boston Black Jack patch cable PC-20-03H Boston patch cables PC-20-06H Boston patch cables PC-20-09H Boston patch cables PC-320-10 Boston flat patch cable PC-320-20 Boston flat patch cable PC-320-30 Boston flat patch cable PC-320-45 Boston flat patch cable PC-320-60 Boston flat patch cable