Dell X1000 Series User Manual page 162

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Guide\Dell_Astute_Network_Admin_PortSettings.fm
The device supports 802.3x flow control for ports configured to Full Duplex
mode. By default, this feature is enabled on all ports, and it can be disabled
per port.
The device supports back pressure for BaseT copper ports configured to Half
Duplex mode. By default, this feature is disabled, and it can be enabled per
port. The back-pressure mechanism prevents the sender from transmitting
additional traffic temporarily. The receiver may occupy a link so it becomes
unavailable for additional traffic.
Port default settings are described in Table 10-1.
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 auto-
negotiation 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
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.
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Network Administration: Port Settings