User manual SMC 6912M

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Manual abstract: user guide SMC 6912M

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[. . . ] TigerSwitch 10/100 Stackable Fast Ethernet Switch N N N N N N N N N N N 12/24 10BASE-T/100BASE-TX ports Optional 100BASE-FX or 1000BASE-SX modules Optional stack module for linking up to four units 8. 8 Gbps of aggregate switch bandwidth Support for redundant power unit Up to five port trunks per switch Port mirroring for non-intrusive analysis QoS support for two-level priority Full support for VLANs with GVRP IP Multicasting with IGMP Snooping Manageable via console, Web, SNMP/RMON Installation Guide SMC6912M SMC6924M TigerSwitch 10/100 Installation Guide From SMC's Tiger line of feature-rich workgroup LAN solutions 6 Hughes Irvine, CA 92618 Phone: (949) 707-2400 February 2001 Pub. However, no responsibility is assumed by SMC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SMC. SMC reserves the right to change specifications at any time without notice. [. . . ] In the figure below, the TigerSwitch 10/100 is operating as a collapsed backbone for a small LAN. It is providing dedicated 20 Mbps full-duplex connections to workstations and 200 Mbps full-duplex connections to power users and servers. Figure 2-1. Collapsed Backbone 2-2 NETWORK PLANNING Central Wiring Closet With up to 100 ports in a stack (i. e. , 100 distinct segments), the TigerSwitch 10/100 can collapse a complex network down into a single efficient bridged node, increasing overall bandwidth and throughput. In the figure below, the 10BASE-T/100BASE-TX ports on the TigerSwitch stack are providing 100 Mbps connectivity for up to 100 segments through SMC's TigerStackTM II 10/100 hubs. In addition, the switch is also connecting servers at 200 Mbps. Figure 2-2. Central Wiring Closet 2-3 NETWORK PLANNING Remote Connections with Fiber Cable Fiber optic technology allows for longer cabling than any other media type (up to 2 kilometers for 100 Mbps fiber at full duplex, or up to 550 meters for 1 Gbps fiber). The TigerSwitch can serve as a collapsed backbone, providing direct connectivity for a widespread LAN. The 100 Mbps fiber modules (with two ports per module) can be used to interconnect remote Fast Ethernet segments. While the Gigabit module can be used for a high-speed connection between floors in the same building, or to connect to other buildings in a campus setting. The figure below illustrates a TigerSwitch connecting multiple segments with fiber cable. Figure 2-3. Collapsed Backbone Using Fiber Cable 2-4 NETWORK PLANNING Making VLAN Connections VLANs can be based on port groups, or each data frame can be explicitly tagged to identify the VLAN group it belongs to. When using port-based VLANs, ports can either be assigned to any number of groups. A single switch can be easily configured to support several VLAN groups for various organizational entities (such as Finance and Marketing). When you expand port-based VLANs across several switches, you need to make a separate connection for each VLAN group. This approach is, however, inconsistent with the Spanning Tree Protocol, which can easily segregate ports that belong to the same VLAN. When VLANs cross separate switches, it is therefore better to use VLAN tagging. This allows you to assign multiple VLAN groups to the "trunk" ports (that is, tagged ports) connecting different switches. Figure 2-4. Making VLAN Connections Note: When connecting to a switch that does not support IEEE 802. 1Q VLAN tags, use untagged ports. 2-5 NETWORK PLANNING Connectivity Rules When adding hubs (repeaters) to your network, please follow the connectivity rules listed below for Ethernet, Fast Ethernet, or Gigabit Ethernet. However, note that because switches break up the path for connected devices into separate collision domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices. 1000 Mbps Gigabit Ethernet Collision Domain Maximum 1000BASE-SX Fiber Optic Cable Distance Fiber Size 62. 5/125 micron 50/125 micron Fiber Bandwidth 160 MHz/km 200 MHz/km 400 MHz/km 500 MHz/km Maximum Cable Length 7-722 ft. (2-550 m) Note: Although maximum cable length for 100BASE-FX fiber depends on the duplex mode, the maximum length for 1000BASE-SX fiber is the same for both half and full duplex. 2-6 NETWORK PLANNING 100 Mbps Fast Ethernet Collision Domain SMC 3-2 Rule for Class II Repeaters Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be: · up to 3 link segments and · up to 2 Class II repeaters (hubs) SMC 2-1 Rule for Class I Repeaters Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be: · up to 2 link segments and · up to 1 Class I repeater (hub) Maximum Network Diameter Using Repeaters Repeater Type and Number 1 Class I 1 Class II 2 Class II Twisted Pair 100BASE-TX 200 m (656 ft. ) 200 m (656 ft. ) 205 m (672. 4 ft. ) Maximum Fast Ethernet Cable Distance Cable Type Twisted Pair Fiber Connecting Any two devices Switch to switch, server or PC Half duplex Full duplex 412 m (1, 351. 4 ft. ) 2 km (1. 24 mi. ) Max. Distance 100 m (328 ft. ) 2-7 NETWORK PLANNING 10 Mbps Ethernet Collision Domain SMC 5-4-3 Rule Between any two PCs or other stations in the same 10 Mbps collision domain, there may be: · up to 5 link segments in series, · up to 4 repeaters (hubs), · up to 3 populated cable segments, that is, segments attached to two or more PCs (coax networks only). * * The remaining two segments are unpopulated; these are known as inter-repeater links or IRLs. This distinction between populated and unpopulated segments is significant for coax networks only. Maximum Ethernet Cable Distance Cable Type Twisted Pair, Categories 3, 4, 5 Thin Coax External Transceiver Drop Maximum Length 100 m (328 ft. ) 185 m (607 ft. ) 50 m (165 ft. ) 2-8 NETWORK PLANNING Application Notes 1. [. . . ] CSMA/CD Carrier Sense Multiple Access/Collision Detect is the communication method employed by Ethernet and Fast Ethernet. End Station A workstation, server, or other device that does not act as a network interconnection. Glossary-2 GLOSSARY Ethernet A network communication system developed and standardized by DEC, Intel, and Xerox, using baseband transmission, CSMA/CD access, logical bus topology, and coaxial cable. The successor IEEE 802. 3 standard provides for integration into the OSI model and extends the physical layer and media with repeaters and implementations that operate on fiber, thin coax and twisted-pair cable. Fast Ethernet A 100 Mbps network communication system based on Ethernet and the CSMA/CD access method. [. . . ]

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