The MultiSwitch 700 Device View

The Current Operational Mode settings indicate which of the available operational modes is currently in effect. If Auto Negotiate is the selected mode, the Current Operational Mode fields will indicate which mode was selected by the link partner.

The Desired Operational Mode settings display the operational mode that is currently selected for this port, and allows you to change the selection.

The following operational modes can be specified:

Speed

This field specifies a port speed of 10MB, 100MB, or 1000MB.

Duplex

This field specifies Half Duplex or Full Duplex mode for the port.

Flow Control

Flow control allows Ethernet devices to notify attached devices that congestion is occurring and that the sending device should stop transmitting until the congestion can be cleared. There are two commonly used methods of flow control: Frame-based (operates on Full Duplex links) and Backpressure (operates on Half Duplex links).

Ports set to Full Duplex mode have frame-based flow control, using pause control frames. Frame-based flow control options are:

Symmetric The port is able to both receive and transmit pause control frames.

Asymmetric RX This option appears only for Gigabit Ethernet ports. The port will receive pause control frames, but will not transmit its own.

Asymmetric TX This option appears only for Gigabit Ethernet ports. The port is

 

capable of sending pause control frames, but will not

 

acknowledge received pause control frames.

Disabled

Disables flow control on the port.

Auto Negotiate

Ports configured to operate in auto negotiation mode will only

 

use pause control frames if the negotiation process determines

 

that the link partner supports them. Both ends of the link must

 

support auto negotiation and a common mode of operation.

Ports set to Half Duplex mode use Backpressure flow control. Backpressure flow control simply asserts the carrier sense signal out the port causing the device transmitting to detect a collision, stop transmitting data, and send the jam signal. Backpressure flow control options are enabled or disabled.

Managing the Module

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Enterasys Networks 700 manual Duplex, Flow Control

700 specifications

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