GS-4012F/4024 User’s Guide

Figure 32 Port Setup

The following table describes the labels in this screen.

Table 12 Port Setup

LABEL

DESCRIPTION

 

 

Port

This is the port index number.

 

 

Active

Select this check box to enable a port. The factory default for all ports is enabled. A

 

port must be enabled for data transmission to occur.

Name

Enter a descriptive name (up to nine printable characters) that identifies this port.

 

 

Type

This field displays 10/100/1000M for the Gigabit Ethernet/ mini-GBIC ports or 1000M

 

for the mini-GBIC ports.

Speed/Duplex

Select the speed and the duplex mode of the connection on this port. Choices are

 

Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex

 

and 1000M/Full Duplex.

 

Selecting 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. Flow Control is used to regulate

 

transmission of signals to match the bandwidth of the receiving port.

 

The switch 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) causing the sending

 

port to temporarily stop sending signals and resend later. Select Flow Control to

 

enable it.

Chapter 7 Basic Setting

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