8.4. 1394b Twisted Cable Physical Layer Attributes
8.4.1. Shielded Twisted Cable
To distinguish 1394b ports from those of traditional FireWire, a new connector with reversed contact orientations as shown in Figure 8.27 has been defined. The plug, as shown on the left side of the figure, has contacts on top and beneath bottom sides of an almost rectangular post in contrast with those inside a cavity. Correspondingly, contacts are inside the cavity of the new 1394b socket as indicated on the right side of the figure. Nine contacts are defined with two additional pins, 5 and 9, for connecting shields of these two twisted pairs and one additional pin, pin 7, which has been reserved for future use. Pins 6 and 8 are used for power supply, pins 1 and ...
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