Cisco CAB-GS-50CM Networking Cable Computer Cable

It is extremely important to understand how to physically connect the GigaStack GBICs and what mode of operation will occur. Each physical configuration is is cabled somewhat differently and may require the use of more than one GigaStack per switch. Failure to comply may result in a loss of connectivity.

The GigaStack GBIC can be cabled in one of the following three ways:

point-to-point
cascaded stack
cascaded stack with a redundant link
The GigaStack GBIC will auto negotiate to either full-duplex or half-duplex. The software determines the mode of operation by the way the cables are connected and the number of switches in the stack.

Note that although duplex can be forced, it is not supported. The only supported option for duplex is to leave it to auto-negotiate.