Lantronix S3220 Series User Guide Rev J PDF 34.75 MB - Page 125

Transition Networks ION x222x / x32xx User Guide Configuring Auto Negotiation The auto negotiate feature is defined on a port basis, letting you set the capabilities that will be advertised for a device over a specific port. Auto negotiation is a feature that can be used by devices that are capable of different transmission rates (such as 10 Mbit/sec and 100 Mbit/sec), different duplex modes (half‐duplex and full duplex), and/or different standards at the same speed. Every device declares its possible modes of operation when attempting to connect to another device. The two devices then choose the best possible modes of operation that are shared by the two devices. These modes of operation include: • Speed • Duplex • Pause capability (whether Pause frames are supported) When one device supports auto negotiation and the other does not, the device that has auto negotiation abilities can determine the speed of the other device, and then select the same speed for itself. However, this procedure can not determine the duplex setting of the other device, so half‐duplex is always assumed. If one device is using full duplex while the other one is using half‐duplex, a duplex mismatch occurs. The usual effect of this mismatch is that the connection works but at a very low speed. Disabling the auto negotiate feature allows you to force the connection to the desired speed and duplex mode of operation as long as both devices can support the operation. Note: The auto negotiate feature is always enabled for gigabit devices/ports. The pause default value for a copper port is "disabled". 10/100/1000BaseT Port - CLI Method 1. Access the NID through either a USB connection (see "Starting a USB Session" on page 41) or a Telnet session (see "Starting a Telnet Session" on page 43). 2. At the command line, type: set ether autoneg state=xx where: xx = enable or disable 3. Press Enter. 33472 Rev. J https://www.transition.com Page 125 of 700