Dell PowerConnect 5324 User's Guide - Page 42
MDI/MDIX, Flow Control, Back Pressure, Switching Port Default Settings
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www.dell.com | support.dell.com MDI/MDIX The device supports auto-detection of straight through and crossed cables on all switching 10/100/1000BaseT ports. The feature is part of the Auto-negotiation and is enabled when Autonegotiation is enabled. When the MDI/MDIX (Media Dependent Interface with Crossover) is enabled, the automatic correction of errors in cable selection is possible, making the distinction between a straight through cable and a crossover cable irrelevant. (The standard wiring for end stations is known as MDI (Media Dependent Interface), and the standard wiring for hubs and switches is known as MDIX.) Flow Control The device supports 802.3x Flow Control for ports configured with the Full Duplex mode. By default, this feature is disabled. It can be enabled per port. The flow control mechanism allows the receiving side to signal to the transmitting side that transmission must temporarily be halted to prevent buffer overflow. Back Pressure The device supports back pressure for ports configured to half duplex mode. By default, this feature is disabled. It can be enabled per port. The back pressure mechanism prevents the transmitting side from transmitting additional traffic temporarily. The receiving side may occupy a link so it becomes unavailable for additional traffic. Switching Port Default Settings The following table gives the port default settings. Table 3-6. Port Default Settings Function Port speed and mode Port forwarding state Port tagging Flow Control Back Pressure Default Setting 10/100/1000BaseT copper: auto-negotiation 100 full duplex Enabled No tagging Off (disabled on ingress) Off (disabled on ingress) 42 Installing the PowerConnect Device