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hub that is capable of solving a wide range of connectivity problems efficiently and economically
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Types of Hubs
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High-end hubs are modular in design, allowing the addition of ports, network interfaces, and special features as they are needed by the organization These enterprise-level hubs can support networks that combine different LAN topologies and media types in a single chassis Ethernet, token ring, and FDDI networks can coexist in a single hub LAN segments using CAT 5 cable (that is, twisted-pair wiring), coaxial cable, and optical fiber also can be interconnected through the hub In such cases, the hub is equipped with media-conversion modules to pass traffic from one type of medium to another Other hubs are available in fixed configurations for departments or workgroups that do not anticipate future growth A variation of the fixedconfiguration hub is the stackable hub A unique feature of stackable hubs is that they can be interconnected through a modular backplane This enables managers to economically expand workgroup and departmental networks as needed Whereas the high-end modular systems are used to build large-scale enterprise networks, stackables are designed for small to medium-sized networks
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Setting Up the Network
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Workgroup hubs are also available, which typically have eight ports or less This type of hub not only provides connectivity among connected workstations, but it also connects to a DSL or cable router to enable all the workstations to share the same Internet access connection This type of hub is popular for small businesses, small office/home office (SOHO) environments, and telecommuters who have multiple PCs in their home A relatively new category of hub is the superhub Superhubs are modular units that provide at least an uplink to a standalone ATM switch, if not some level of integral ATM switching, in addition to 10/100/1000 Mbps LAN support, and integrated LAN switching and routing Fully populated superhubs support in excess of 500 ports of mixed-media, shared, and switched connectivity over a redundant gigabit-per-second backplane in a softwaremanageable, fault-tolerant, hot-swappable modular chassis that can cost well over $100,000
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Hub Components
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Enterprise-level intelligent hubs contain four basic components a chassis, a backplane, plug-in modules, and a network management system Chassis The chassis is the hub s most visible component It contains an integral power supply and/or primary controller unit and varies in the number of available module slots The modules insert into the chassis and are connected by a series of buses, each of which may constitute a separate network or integrate with one or more backbone networks The chassis holds the individual modules To fit into the chassis, each module is instantly connected to other modules via the hub s high-speed backplane Backplane The main artery of the hub is its backplane, a board that contains one or more buses that carry all communications between LAN segments The hub s backplane is analogous to a PC bus through which various interface cards may be interconnected The data path that carries traffic from card to card is often called a channel; unlike the PC, though, the hub s backplane typically consists of multiple physical or logical channels The hub accommodates at least one LAN segment for each channel on the backplane Segmenting the backplane in this way enables multiple independent LANs or LAN segments to coexist within the same chassis A separate backplane channel is usually present to carry management information The segmented backplane typically has dedicated channels for Ethernet, token ring, and FDDI networks Some hubs employ a multiplexing tech-
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nique across the backplane to divide the available bandwidth into multiple logical channels Other hubs support load sharing that enables network modules to select the backplane channel that will transport the traffic Still other hubs are designed to enable backplanes to be added or upgraded to accommodate network expansion and new technologies The potential bandwidth capacity of newer backplane designs supporting ATM switching is quite impressive, reaching well into the gigabit-persecond range more than enough to accommodate several Ethernet, token ring, and FDDI networks simultaneously Modules The functionality of hubs is provided by individual modules The type of module used depends on the hub vendor Typically, the vendor will provide multiuser Ethernet and token ring cards, LAN management, and LAN bridge and router cards The use of bridge and router modules in hubs overcomes the distance limitations imposed by the LAN cabling and facilitates communication between LANs and WANs Plug-in modules are even available for terminal servers, communications servers, file and application servers, and Systems Network Architecture (SNA) gateways Hub vendors also offer a variety of WAN interfaces, including those for IP, frame relay, ISDN, T-carrier, and ATM As many as 60 different types of modules may be available from a single hub vendor, many of them provided under a third-party original equipment manufacturer (OEM), technology swap, and other vendor-partnering arrangements Modules plug into vacant chassis slots Depending on the vendor, the modules can plug into any vacant slot or slots specifically devoted to their function Hubs supporting any-slot insertion automatically detect the type of module that is inserted into the chassis and establish the connections to other compatible modules In addition, many vendors offer a hot-swap capability that permits modules to be removed or inserted without powering down the hub Management System Hubs occupy a strategic position on the network, providing the central point of connection for workstations, servers, hosts, bridges, routers, and APs on the LAN and over the WAN The hub s management system is used to view and control all devices connected to it, providing information that can greatly aid troubleshooting, fault isolation, and administration The management tools typically fall into five categories: accounting management, configuration management, performance management, fault management, and security management
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