HP E2731B Relay module

Otherwise, a duplex mode mismatch can occur. A switch port, using Auto-Negotiation, will default to half-duplex if it detects that the end-node is not using Auto-Negotiation. This will result in a mismatch if the end-node is operating at a fixed duplex mode of full-duplex. Consequently, when connecting an end-node with a fixed duplex mode of full-duplex to a switch port, you should use the AT-S39 management software to disable Auto-Negotiation on the port and set the port speed and duplex mode manually

Maximum Distance 

The ports have a maximum operating distance of 100 meters (328 feet). Type of Cable For 10 Mbps, the port requires Category 3 or better 100 ohm shielded or unshielded twisted pair cabling. For 100 or 1000 Mbps operation, the ports require Category 5 or Enhanced Category 5 (5E) 100 ohm shielded or unshielded twisted pair cabling.

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