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Note: A laser transmitter could drive 3 separate fibers With wavelengthdivision multiplexing, one fiber will carry these 3 optical carriers transporting 45 total TV channels
Figure 8-3 Example of wavelength-division multiplexing
Figure 8-4 Network topologies
Off-air station
Trunk
Office studio Satellite downlinks a Simple one-node network Trunk Feeder
Off-air station
Super-trunk cascade or optical fiber
Trunk-to-feeder system
Satellite downlinks
Hub studio Super-trunk cascade or optical fiber
b The hub is the main signal distribution point, fed by remote broadcast station receivers and satellite downlinks
813 Computer Communications
8
When computer technology developed to the point where personal computers became practical and affordable, the need to interconnect them became a necessity, particularly in the business world Naturally the telephone system was investigated, and telephone modems were developed that made possible data communications between computer workstations However, within commercial of ces in the same building a more ef cient method of connecting workstation to workstation to mass data storage servers was needed Companies that had their own PBX telephone system could use telephone modems for data communications Many companies decided to interconnect computers by installing their own networks, called local area networks (LAN) These networks were designed as hard-wired bidirectional networks Large corporations with many of ces spread over several cities developed methods to interconnect the LANs These large data networks were called wide-area networks (WAN) Further expansion gave rise to metropolitan wide-area networks (MWANS) 8131 The network topologies for these networks were basically one of three types: the star, ring, or bus con guration Each had its own access method Figure 8-5 illustrates the basic network concepts The publicswitched telephone network (PSTN) is basically a star network with the local exchange of ce (LEX) at the center of the star where circuits were switched IBM proposed the ring network, where a token was circulated around the ring The station that had the token had permission to transmit to another station This type of system is known as a token-ring net-
Figure 8-5 L AN topologies
Switched star
Telephone and/or workstations n
1 Network controller 3 Workstations
2 Ring type
Star type Termination 1 2 3 4 Workstations Bus type
Termination
Cable System Network Design Considerations
work This token was actually a common password set by the network operating system software The bus topology uses a simple cable system of either UTP or coaxial cable connecting all workstations The ends of the cable have to be properly terminated in the characteristic impedance Access is on a rst come, rst served basis and the procedure uses carrier sense multiple access/collision avoidance (CSMA /CA) The station wishing to transmit to another station on the bus listens to the bus to check if anyone is transmitting If not, the bus is available; if a carrier is sensed the station waits and tries another time If a rare occurrence of two stations transmitting simultaneously happens, both stations detect each other s carrier and go into a time-out mode The time-out period is random for each station and when it is over they can try again The station that has the shortest time-out period gets to try transmitting before the other station Data can be transmitted between stations at adequate rates and periods until the number of users ( workstations) increases to a point that data-handling speeds decrease 8132 Ethernet local area networks are one of the oldest and robust bus systems still in use today Many say that Ethernet keeps reinventing itself Data rates kept rising with each new issue of Ethernet Xerox and Digital Equipment Corporation, along with Intel, collaborated in forming and promoting Ethernet The Institute of Electrical Electronic Engineers (IEEE) worked with the founding corporations to sponsor the 802 standards group From time to time, as faster semiconductor digital circuits were developed, the 802 standards would be upgraded and Ethernet data rates increased accordingly Ethernet started to speed up at 10 based T, which was at a 10 mbps Coaxial cable at a 50-ohm characteristic impedance (RG8u or RG58u was used in a basic bus topology) Ethernet topology was introduced in 5 along with other LAN topologies The principle reason Ethernet has lasted so long and is presently supporting data rates of 10 Gbps is that it is a protocol where the data frames of packets are de ned As cables improved the simple frame format would easily support the high data rates 8133 LAN/ WAN cables have improved over the years Unshielded twisted-pair cables used by the telephone industry were the rst basic carrier of digital signals When one pair would not support the speed requirements another pair was used, resulting in CAT 3, 4, 5, and 6 series of paired cable Coaxial cable, with its larger bandwidth and hence high speed, allowed for higher data rates The telephone industry supplies services to the subscribers using the twisted-pair copper cables The cable televi-
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