Dell PowerConnect 5548 User Guide - Page 379
Overview, Auto-Negotiation, MDI/MDIX - autonegotiate
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Overview This section includes a description of port features and describes the following: • Auto-Negotiation • MDI/MDIX • Flow Control • Back Pressure • Port Default Settings Auto-Negotiation Auto-negotiation enables automatic detection of speed, duplex mode and flow control on all switching 10/100/1000BaseT ports. Auto-negotiation is enabled on all ports by default. Auto-negotiation is a mechanism established between two link partners to enable a port to advertise its transmission rate, duplex mode and flow control abilities to its partner. Both ports then operate at the highest common denominator. If connecting a Network Interface Card (NIC) that does not support autonegotiation or is not set to auto-negotiation, both the device switching port and the NIC must be manually set to the same speed and duplex mode. If the station, on the other side of the link, attempts to auto-negotiate with a device 100BaseT port that is configured to full duplex, the auto-negotiation results in the station attempting to operate in half duplex. MDI/MDIX The device supports auto-detection of straight-through and crossed cables on all 10/100/1000BaseT ports. This feature is part of auto-negotiation and is enabled when Auto-negotiation is enabled. When the MDI/MDIX (Media Dependent Interface with Crossover) is enabled, the automatic correction of errors in cable selection is possible, thus making the distinction between a straight-through cable and a crossover cable Dell PowerConnect 55xx Systems User Guide 379