Dell PowerConnect 5524P User Manual page 380

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 to Full Duplex
mode. By default, this feature is enabled on all ports, and it can be disabled
per port.
Flow control creates a lossless link with no packet loss. The flow control
mechanism enables the receiving side to signal to the transmitting side that
transmission must temporarily be halted to prevent buffer overflow. This
signaling is done by sending PAUSE frames. The ports that receives pause
frames stops transmitting traffic.
Flow control on the device works in Receive-Only mode, meaning that the
interfaces with enabled flow control receive PAUSE frames, but do not send
them.
When flow control is enabled, the system buffers are allocated per port so
that if the buffers of one port are consumed, other ports will still have their
free buffers.
Back Pressure
The device supports back pressure for 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
Table 12-1 describes the port default settings.
Table 10-1. Port Default Settings
Function
Port speed and mode
Port forwarding state
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Dell PowerConnect 55xx Systems User Guide
Default Setting
10/100/1000 BaseT copper: auto-negotiation
SFP+1000/10G Mbps full duplex, auto discovery
Enabled