HP E9821A Counter module

The ports are auto-MDI/MDI-X. They automatically configure themselves as either MDI or MDI-X. This feature allows you to use a straight-through twisted pair cable to connect any type of network device to a switch port. Note Disabling Auto-Negotiation on a port also disables Auto MDI/MDI-X on the port. You must set the MDI/MDI-X manually through the management software, refer to the AT-S39 Management Software User’s Guide.

Port Pinouts 

For the pinouts of these ports when operating at 10 or 100 Mbps in the MDI configuration, refer to Table 9 on page 85. For the pinouts of the ports when operating at 10 or 100 Mbps in the MDI-X configuration, refer to Table 10 on page 85. For port pinouts when the ports are operating at 1000 Mbps, refer to Table 11 on page 86.

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