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Hubs
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Fibre Channel hubs are used to connect nodes in a loop. Logically, the hub is similar to a Token Ring hub with ring in and ring out. Each port on a hub contains a port bypass circuit (PBC) to automatically open and close the loop. Hubs support hot insertion and removal from the loop. If an attached node is not operational, a hub will detect this and bypass the node. Typically, a hub has 7 to 10 ports and can be stacked to the maximum loop size of 127 ports.
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Fibre Channel link analyzers capture the causes and effects of data errors. Specific frame headers can be monitored and captured for analysis.
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Multimode cable is dominant for short distances of 2 km or less. Multimode has an inner diameter of 62.5 or 50 microns, enabling light to enter the cable in multiple modes, including straight and different angles. The many light beams tend to lose shape as they move down the cable. This loss of shape is called dispersion and limits the distance for multimode cable. The product of bandwidth and distance measures cable quality. Existing 62.5-micron fiber distributed data interface (FDDI) cable is usually rated at 100 or 200 MHz/km, providing gigabit communications for up to 100 or 200 m.
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Routers: LAN Switch
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Routers (LAN switches) interface Fibre Channel with legacy LANs. These are layer 2 and/or layer 3 devices that use Fibre Channel for a reliable gigabit backbone.
SCSI Bridge
Fibre Channel provides the ability to link existing SCSI-based storage and peripherals using a SCSI bridge. SCSI-based peripherals appear to the server or workstation as if they were connected directly on Fibre Channel.
Static Switches
Static switches, also called link switches, provide point-to-point connections and are controlled externally. They offer a low-cost option
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Fibre Channel
5 for applications not requiring the fast, dynamic switching capability inherent in the Fibre Channel protocol.
Switch WAN Extender
Fibre Channel switches can be connected over wide area networks (WANs) using an interworking unit (IWU). Expansion ports on switches are linked using either ATM or Synchronous Transfer Mode (STM) services. Since Fibre Channel may be faster than a single ATM or STM interface, multiple WAN channels can be used for full Fibre Channel bandwidths.
Addressing
Unlike many LAN technologies that use a fixed 6-byte MAC address, Fibre Channel uses a 3-byte address identifier that is dynamically assigned during login. N_Ports transmit frames from their own S_ID to a D_ID. Addresses in the range of hex FFFFF0 to hex FFFFFE are special. Well-known addresses are used for such things as the fabric, alias server, and multicast server. Before fabric login, the N_Port s S_ID is undefined: hex 000000 . Hex FFFFFF is reserved for broadcast. In a point-to-point topology, fabric login will fail, of course, and the two ports simply will chose two unique addresses. Arbitrated-loop devices still use the 3-byte address identifiers but also use an AL_PA. AL_PAs are 1-byte values dynamically assigned each time the loop is initialized. Once the loop is initialized and each L_Port has selected an AL_PA, public NL_Ports will attempt fabric login. If there is an FL_Port, the fabric will assign the upper 2 bytes of the NL_Port s address identifier and usually allow the low byte to be the NL_Port s AL_PA. (If not, the loop will need to be reinitialized so that the NL_Port can select the fabric-assigned AL_PA.) If no fabric exists, or if an NL_Port is a private NL_Port (does not log in with the fabric), the upper 2 bytes of the address identifier will remain 0000 , and the lower byte simply will be the NL_Port s AL_PA. However, there still needs to be a way to uniquely identify a port even for much of the preceding initialization to take place. This is
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