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LAN/ WANs have gone through several generations of cables Older systems started using telephone-type twisted-pair cables operating in Ethernet When the network expanded and higher data rates were required, conversion to a coaxial cable system resulted LAN/ WAN systems were not as long as either the cable television or telephone systems The bustype coaxial cable operating in Ethernet lasted a long time However, many LAN/ WAN systems required higher data rates, so optical ber was selected to replace coaxial cable systems Multimode optical ber supplies the needs of many LAN/ WAN systems Today, a good number of systems
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Figure 8-12 Combining multiple channels
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RF combining network
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Fifteen TV channels are grouped together by an RF combiner and amplified to a sufficient level to drive the laser transmitter One could set the laser transmitters for different wavelengths and combine them optically to a single fiber
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operate with 625/125 or 50/100 multimode ber Because this type has a distance speed limit, single-mode ber bridges provide the linking of several multimode systems 8231 LAN/ WAN systems that convert to optical ber systems often have the ber installed in the same raceways and/or conduits as the coaxial cable When the new ber system was completed and workstations and servers were connected, they would end the upgrade process and the old LAN cable was left in place Present-day building codes now require the old, unused cable be pulled out This requirement was the result of the new re protection rules for buildings Many state laws require a company to remove all of its cable system if they move or vacate the premises 8232 A great many LAN systems operate using Ethernet and when optical ber is used, Ethernet can be upgraded from 100 base T to 10-G bit Ethernet The whole LAN operation is usually speeded up by a factor of at least 10 over wired systems In many instances more workstations are added as the volume of the user s business increases, with no problems with the LAN system operation Each workstation connected to the optical system requires a special interface unit where the optical signal is converted to serial/parallel electrical signals required by the computer Electrical data signals have to be converted to optical signals in order for each workstation to transmit This procedure is shown in Figure 8-13 Several companies manufacture and sell such network interface units (NIU) to users and often provide design services as part of a package Fast Ethernet systems send data packets containing digital information fast enough to provide video and voice over their networks Commercial busi-
Figure 8-13 L AN to workstation network interface unit
Optical combiner Optical to electrical receiver
Data out from system
Optical in/out
Laser or LED transmit electrical to optical Data in from system
Network interface unit
One option is to use two separate fibers; one in, the other out
Cable System Network Design Considerations
nesses using such Ethernet optical- ber systems can provide audio/video channels for personnel training 8233 A ring-type network topology offers some advantages over bus LANs The ring system uses the cable in a ring pattern, as shown in 4 However, remember that the ring system requires a token passing for permission to transmit through the system A double ring system consisting of a dual- ber cable in a ring pattern can carry high-speed data carrying an enormous amount of data The ber distributed data interface (FDDI) operating at 100 Mbps standard was adopted by ANSI and provides high-speed data up to 2 km Today, that distance could be increased because many improvements in optical equipment have taken place This ring system uses two bers, one operating in one direction and the other in the opposite direction; this is often called a counter-rotating system Such a system can be nearly self-healing in the case of mishaps This FDDI dual ring is shown in Figure 8-14
Figure 8-14 Fiber-distributed data interface
Node 1 A computer workstation is connected to each node interface unit
Node n
Node 2
FDDI-ring topology
Node 5
Node 3 Node 4
FDDIs provide a 100 Mbps data rate
Two bers (dual connectors): data is the same in both rings and is counter-rotating through each node
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