Computer Network cables wiring  > Cisco pinouts

Cisco's GigaStack cable uses connectors that visually look physically identical to a 6-pin FireWire connector with the addition of a special gasket-like ring on the outside that appears to help it mate with the socket and probably provides better EMI shielding.

 1,2  1,2  
 3  3  
 4  4  
 5  5  
 6  6  

Cisco states that you should not interchange a GigaStack and FireWire cable.One of the reasons is the pinout of the cable itself.  Pins 1 and 2 are shorted to each other electrically. This probably provide a way for the GigaStack GBIC to identify a real GigaStack cable versus a FireWire cable.

 Otherwise, the pinout of the cable appears identical to a 6-pin to 6-pin FireWire cable by testing an actual cable. 

4 pin, 6 pin or 9 pin IEEE1394 (FireWire) plug connector layout
4 pin, 6 pin or 9 pin IEEE1394 (FireWire) plug connector
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Cisco GigaStack cable visual pinout:
Cisco GigaStack cable diagram
click to enlarge
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