User manual 3COM 3C16475BS

[. . . ] No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation. 3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change. 3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time. [. . . ] To change the settings of a port: 1 Under the Port column of the Port Configuration Table 10 Port Setting Options Option Description Status ■ ■ Enable – Activates the port Disable – Shuts down or disables the port By default, admin setting is set to enable. Auto Negotiate Autonegotiation, which is enabled by default, sets the optimum combination of speed and duplex that can be supported by both ends of the link. Available options for autonegotiation include: ■ screen, click the port number that you want to configure. the Port Settings screen appears , as shown in Figure 13. Figure 13 Port Settings Screen Enable – Enables autonegotiation for the port. If autonegotiation is enabled, options for Speed Duplex are unavailable. disable – Disables autonegotiation for the port. If autonegotiation is disabled, you need to set the speed and duplex mode in Speed Duplex. Configuring VLANs 33 Option Speed Duplex Description Sets the preferred speed and duplex mode for the port. This option is only available when autonegotiation for the port is disabled. Available speed and duplex modes include: ■ ■ ■ ■ ■ 1000Mbps connections are always full-duplex. Half-duplex connections are only available for 10Mbps and 100Mbps settings. CAUTION: Before manually setting a port to full-duplex, verify that the device connected to the port is also manually set to the same speed and duplex setting. If connecting link partners are left to autonegotiate for a link manually set on this switch to full-duplex, they will always negotiate to half-duplex, resulting in a duplex mismatch. this can result in a significant reduction in network performance. If you are unsure of how to configure the speed/duplex setting, simply enable autonegotiation for the port. You cannot modify the speed/duplex settings of ports that are members of a trunk or aggregated link. supported SFP transceivers only operate at 1000Mbps full-duplex. Inserting an SFP transceiver into a gigabit port disables the corresponding RJ-45 port, even if no fiber cable is inserted. 10Mbps Half 10Mbps Full 100Mbps Half 100Mbps Full 1000Mbps Full (for ports 25 and 26 only) – See “Speed/Duplex for 1000 Mbps Connections” on page 33. Flow Control When enabled, controls packet flow so that a sending device does not transmit more packets than a receiving device can process. If flow control is disabled, packets may be dropped under certain periods of high traffic loads. [. . . ] It is used to create IP address numbers used only within a particular network (as opposed to valid IP address numbers recognized by the Internet, which must assigned by InterNIC). subnet A network that is a component of a larger network. Switch A device that interconnects several LANs to form a single logical LAN that comprises of several LAN segments. Switches are similar to bridges, in that they connect LANs of a different type; however they connect more LANs than a bridge and are generally more sophisticated. [. . . ]