Tripp Lite NGI-S04C2 Owner's Manual page 27

Auto-MDIX (automatic medium-dependent interface crossover) is a computer
networking technology that automatically detects the required cable connection type
(straight-through or crossover) and configures the connection appropriately, thereby
removing the need for crossover cables to interconnect switches or connecting PCs
peer-to-peer. When it is enabled, either type of cable can be used or the interface
automatically corrects any incorrect cabling. For Auto-MDIX to operate correctly, the
speed on the interface and duplex setting must be set to "auto". Auto-MDIX was
developed by HP engineers Dan Dove and Bruce Melvin.
Auto Negotiation

Auto (auto negotiation) allows one port to negotiate with a peer port automatically to
obtain the connection speed and duplex mode that both ends support. When
auto-negotiation is turned on, a port on the Switch negotiates with the peer automatically
to determine the connection speed and duplex mode.
If the peer port does not support auto-negotiation or turns off this feature, the Switch
determines the connection speed by detecting the signal on the cable and using half
duplex mode. When the Switch's auto-negotiation is turned off, a port uses the
pre-configured speed and duplex mode when making a connection, thus requiring you to
make sure that the settings of the peer port are the same in order to connect.
Flow Control

A concentration of traffic on a port decreases port bandwidth and overflows buffer
memory causing packet discards and frame losses.IEEE802.3x flow control is used in full
duplex mode to send a pause signal to the sending port, causing it to temporarily stop
sending signals when the receiving port memory buffers fill and resend later.
The Switch uses IEEE802.3x flow control in full duplex mode and backpressure flow
control in half duplex mode. IEEE802.3x flow control is used in full duplex mode to send
a pause signal to the sending port, causing it to temporarily stop sending signals when the
receiving port memory buffers fill. Back Pressure flow control is typically used in half
duplex mode to send a "collision" signal to the sending port (mimicking a state of packet
collision) causing the sending port to temporarily stop sending signals and resend later.
Note: 1000 Base-T does not support force mode.
Cable Test

This feature determines the quality of the cables, shorts, and cable impedance mismatch,
bad connectors, termination mismatch, and bad magnetics. The feature can work on the
copper Ethernet cable only.
Default Settings
The default port Speed & Duplex is auto for all ports.
The default port Flow Control is off for all ports
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