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5.1
Ethernet Parameters
5.1.1 Speed
When auto-negotiation is turned on, an Ethernet port negotiates with the peer automatically to determine the
connection speed and duplex mode. If the peer Ethernet port does not support auto-negotiation or turns off
this feature, the device determines the connection speed by detecting the signal on the cable and using half
duplex mode. When the device's auto-negotiation is turned off, an Ethernet 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 Ethernet port are the same in order to connect.
5.1.2 Duplex Mode
Duplex mode choices are half duplex or full duplex. When auto-negotiation is turned on, the Ethernet port on
the device negotiates with the peer automatically to determine the connection speed and duplex mode. When
a port is in half-duplex mode, it can either send data or receive data at a given time. When a port is in full-
duplex mode, it can simultaneously send and receive data, effectively doubling its throughput.
5.1.3 Flow Control
A concentration of traffic on a port decreases port bandwidth and overflows buffer memory causing packet
discards and frame losses. Flow Control is used to regulate transmission of signals to match the bandwidth of
the receiving port.
The Prestige uses IEEE802.3x flow control in full duplex mode and back pressure 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) when the receiving port memory buffers are full causing the
sending port to temporarily stop sending signals and resend later.
5.2
Ethernet Commands
Syntax:
ether driver status
Ethernet Setup
This chapter provides the information on Ethernet configuration.
Prestige 650M-6x User's Guide
Chapter 5
Ethernet Setup
5-1
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