User manual NETGEAR GS108

[. . . ] All Rights reserved Trademarks NETGEAR and the NETGEAR logo are registered trademarks of NETGEAR, Inc. In the United States and/or other countries. microsoft , Windows , and Windows NT are registered trademarks and Vista is a trademark of Microsoft Corporation. Other brand and product names are trademarks or registered trademarks of their respective holders. [. . . ] Shows the VLAN ID to which the address is assigned. Shows whether the entry is dynamic or static. 0, December 2007 Configuring Switching Chapter 5 Configuring QoS and Security This chapter describes how to use the QoS tab and the Security tab: • • “Using the QoS Tab” “Using the Security Tab” Using the QoS Tab The navigation tabs on the top of the home page include a QoS tab that lets you manage your GS108T Gigabit Smart Switch using features under the following main menu commands and subcommnands: • “CoS” • “Basic—QoS Global Configuration” • “Basic—Rate Limit” • “Advanced—801. 1p to Queue Mapping” • “Advanced—DSCP Priority Mapping” The sections that follow in this chapter cover these features and tell you how to configure them in the GS108T Smart Switch. CoS The class of service (CoS) menu lets you classify specific traffic at the Layer 2 level by manipulating the CoS bits, thereby allowing you to configure quality of service (QoS). Basic—QoS Global Configuration There are two possible priority tag settings for the QoS; that is, there are two QoS modes: • 802. The eight priority tags that are specified in IEEE 802. The QoS setting lets you map each of the eight priority levels to one of four internal hardware priority queues: High, Normal, Low, and Lowest. The six most significant bits of the DiffServ field are called the Differentiated Services Code Point (DSCP) bits. You can map the DSCP value to one of the eight priority levels (p0 to P7) of IEEE 802. 1p priority level to one of the four internal hardware queues. The switch empties the four hardware priority queues in order, beginning with the highest priority queue to the lowest priority queue. Each hardware queue transmits all of the packets in its buffer before permitting the next lower priority to transmit its packets. 1p Based or the DSCP Based radio button to determine the QoS mode. Basic—Rate Limit The Rate Limit screen, which is also referred to as the Rate Control Setting screen, lets you control the bandwidth of ingress (incoming) and egress (outgoing) traffic for a specific port. You can make changes to the bandwidth limits for an individual port, for a group of ports, or for all ports simultaneously: • To change the bandwidth limits for an individual port, select the check box to the left of its port number, and then select bandwidth limits. Note: You can also enter the interface number (that is, the port number) in the GO TO INTERFACE field, and then click GO. € • To change the bandwidth limits for a group of ports, select the check boxes to the left of their port numbers, and then select the bandwidth limits. To change the bandwidth limits for all ports simultaneously, select the check box at the top of the column of check boxes, and then select the bandwidth limits. Specifies the rate limitation of incoming traffic in this port. The possible values in bits per second (bps) are: – 512K bps, 2M bps, 4M bbps, 10M bps, 20M bps, 40M bps, 60M bps, 100M bps, 200M bps, 400M bps, and 1000M bps. Specifies the rate limitation of outgoing traffic in this port. [. . . ] It is important that any untwisting be minimized to 3/8 inch (10 mm) for RJ-45 connections. If not correctly implemented, this can adversely affect all cabling settings. Near End Cross Talk Near End Cross Talk (NEXT) is a measure of the signal coupling from one wire to another, within a cable assembly, or among cables within a bundle. NEXT measures the amount of cross-talk disturbance energy that is detected at the near end of the link—the end where the transmitter is Network Cabling v1. [. . . ]