HP E1439C Remote control module

In order for a switch port to successfully Auto-Negotiate its duplex mode with an end-node, the end-node should also be using AutoNegotiation. 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.

Duplex Mode

 Each twisted pair port on the switch can operate in either half- or fullduplex mode. The twisted pair ports are IEEE 802.3u-compliant and will Auto-Negotiate the duplex mode setting. If desired, Auto-Negotiation on one or all of the switch ports can be disabled so that you can set the duplex mode manually through the switch’s management software.

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