User manual D-LINK DES-818

[. . . ] DES-810 DES-818 10/100 Fast Ethernet Switch User's Guide Rev. 02 (Aug. , 1997) 6DES810. . . 02 Printed In Taiwan RECYCLABLE Wichtige Sicherheitshinweise 1. Bitte lesen Sie sich diese Hinweise sorgfältig durch. Heben Sie diese Anleitung für den spätern Gebrauch auf. [. . . ] Each workgroup forms a separate LAN (also known as a segment or collision domain), and these workgroups can be easily interconnected through switches, bridges, or routers to form one LAN large enough to encompass a high-rise building or campus environment. Recent innovations in LAN hub technology such as stackable hubs, coupled with the decreasing cost of switches, bridges, and routers, allow the design of low-cost, efficient Fast Ethernet workgroups and enterprise LANs. The following factors strongly influence the architecture of Fast Ethernet networks: · The EIA/TIA 568 Wiring Standard imposes a 100 meter limit on horizontal runs of twisted-pair cables; that is, connections from the wiring closet to the end-station. Fast Ethernet's increased operational speed reduces the maximum distance between all elements of the LAN (see below). The EIA/TIA 568 Wiring Standard does not support the use of coaxial cables for horizontal wiring. · · Network Network diameter, which is the distance between two end-stations in the same collision domain, is the primary difference between traditional Ethernet and Fast Ethernet. Due to the increased speed in Fast Ethernet and adherence to the EIA/TIA 568 wiring rules, the network diameter of a Fast Ethernet collision domain is limited to 205 meters; in contrast, the maximum 10BASE-T Ethernet collision domain diameter can be up to 2500 meters. Overview 3 Hubs Unlike 10BASE-T hubs which are all functionally identical, Fast Ethernet hubs are divided into two distinct types: Class I and Class II. A Class I hub repeats all incoming signals on one port to the other ports by first translating them to digital signals and then retranslating them back to line signals. These translations are necessary when connecting various network media to the same collision domain, such as when combining two wire-pair 100BASE-TX media with four wire-pair 100BASE-T4 media. Only one Class I hub can exist within the same collision domain, thus this type of hub cannot be cascaded. A Class II repeater, on the other hand, immediately repeats all incoming line signals on one port to the other ports; no translations are performed. This type of hub connects identical media to the same collision domain; for example, TX to TX. At most, two Class II hubs can exist within the same collision domain. The cable used to cascade these hubs is called an inter-repeater link (IRL). As mentioned earlier, stackable hubs can be used to increase the number of available nodes in a collision domain. An entire hub stack counts as a single repeater. Connectivity Rules · The maximum length of a twisted-pair segment (that is, distance between a port in the hub to a single-address network device such as a PC, server, or LAN switch) is 100 meters. The maximum diameter in a collision domain is about 205 meters using two Class II hubs (or hub stacks) and 200 meters using one Class I hub. Between any two end-stations in a collision domain, there may be up to three segments and two Class II hubs or two segments and one Class I hub. · · 4 Overview 10/100 Fast Ethernet Switch User's Guide Switching Technology Switching is fast becoming the industry standard for pushing the limits of existing Ethernet networks. A switch bridges Ethernet packets between Ethernet and Fast Ethernet LAN segments at the MAC address level of the Ethernet protocol. The difference between switched Ethernet (10Mbps, 100Mbps, or both) and traditional Ethernet is analogous to the difference between a private phone line and a party line. With switched Ethernet, each workgroup has a "private line" so that transmitted packets don't have to wait as long to gain access to the network. When connected to a switched port, each Ethernet segment has full "wire-speed" access, so a switch effectively divides a single Ethernet LAN into bridged multiple LAN segments. Each segment can support a workgroup or even provide a dedicated connection for a key workstation or server. [. . . ] To set for half-duplex, set the duplex switch down. To set either or both ports 1 and 2 to auto duplex mode detect, set the corresponding switch down. Figure 6 Setting the Duplex Mode Note: Full-duplex mode can only be used for connections to other switches, network servers, or network stations. Connections to hubs must use half-duplex mode only. Network Configuration Examples This section provides sample configurations showing ways you might use the 10/100 Fast Ethernet Switch. 18 Installation 10/100 Fast Ethernet Switch User's Guide LAN Microsegmentation Perhaps the principal purpose for the 10/100 Fast Ethernet Switch is to microsegment an existing LAN to improve network latency rates and increase overall performance. The 100Mbps ports on the switch can be used to connect those segments which require greater throughput. Figure 7 Microsegmenting a LAN and Adding 100Mbps Segments Fast Ethernet Server Connection The 10/100 Fast Ethernet Switch is an ideal device for connecting a dedicated server via a 100Mbps line to a 10Mbps network. [. . . ]