Legacy and Less Common Cabling Systems in Software

Generation QR Code ISO/IEC18004 in Software Legacy and Less Common Cabling Systems

APPENDIX B
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Legacy and Less Common Cabling Systems
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The ease of networking, even though it is a slow, peer-to-peer method, has both helped and hurt Apple users It has helped by making the network a quick and natural solution to data and print sharing that must have made IBM-style PC users envious (or at least confused) On the other hand, the relatively low speed and proprietary nature of the native network, without expensive upgrade modules for Ethernet or Token-Ring, initially put AppleTalk users at a comparative disadvantage The original LocalTalk connection used a cumbersome shielded cable, but then Farallon Computing made a compatible adaptation called PhoneNet on twisted pair wiring This is the simple LocalTalk connection that most users are familiar with Many users employ standard telephone cord to connect devices This telephone cord is typically the flat silver-satin type 4-wire cable, although twisted-pair cable will work even better The network runs at only 2304 kbps, so the normal crosstalk and attenuation problems are not as severe LocalTalk can operate well on TIA-568-C The same comments apply to potential wiring problems with LocalTalk that were stated for any of the twisted-pair networks Because LocalTalk can use ordinary flat phone wire, many users will simply purchase preassembled cables, which have few faults However, this wiring method sometimes leads to long runs of wire being routed around furniture and across traffic areas Any abrasions or cuts in the cable will have network consequences Often a network must be split at some point and terminated to diagnose such cable problems FDDI Fiber Distributed Data Interface (FDDI) is a fiber-optic networking technology that operates at 100 Mbps It employs dual, counter-rotating, token-passing rings The network concept is actually fairly complex and is different from either Ethernet or Token-Ring Network nodes that sit on the primary fiber ring are called dual-attach nodes and employ a sophisticated automatic wraparound of the FDDI signal in the event of a cut in the ring This is somewhat akin to the backup path in Token-Ring, but the fiber in an FDDI ring is expected to take a diverse path to the next node in line In the event of a fiber cut or other failure, the dual-attach nodes at each end automatically loop back and the network continues without the missing component Each dual-attach node has two dual fiber connectors for a total of four individual fiber-optic connections Each connector has a fiber input and output, but the FDDI signal actually passes from one input, through the node processor, and out the opposite connector s output fiber onto the next node This produces dual signals in opposite directions Another type of node, called a single-attach node, implements the basic FDDI protocol, but attaches point-to-point in a star fashion to a concentrating node This
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PART FOUR
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concentrating node is customarily on the actual ring (and is dual-attach), and benefits from its fault-tolerant design The single-attach node lacks the loop back path to its concentrator node, and so is normally used within the same building where the fiber cuts would be rare The FDDI topology is an American National Standards Institute (ANSI) standard The fiber is standard 625/125 mm fiber terminated in the unique duplex FDDI connector Both multimode and single-mode fiber are supported, although the interface module is different, since single mode requires a laser-diode transmitter An FDDI single-attach connection could be supported on a TIA-568-C fiber-optic link, but an adapter cable would have to be used to connect to the 568-SC connectors in the workstation outlet Because FDDI is neither an Ethernet nor a Token-Ring protocol, those and other protocols are usually encapsulated into an FDDI packet and decoded at the receiving station This method simply uses the FDDI link as a transport mechanism that frees one from the point-to-point nature of most WAN links ATM Asynchronous transmission mode (ATM) is a very high speed communications protocol that does not really imply a particular LAN topology As a matter of fact, the ATM protocol can be used over long distances in what is often called the wide area network (WAN) The ATM protocol specifies a 53-byte cell that is somewhat analogous to a packet or frame of conventional variable-length MAC-layer protocols Unlike those protocols, the ATM cell does not always contain source and destination addresses, nor does it contain the higher-level addressing and control of longer packets ATM is actually a very abbreviated point-to-point, switched protocol An ATM message typically sets up a virtual connection between a source and destination, transmits cell-size chunks of the message, and ends the connection The cells may go through many switching points before reaching the destination The protocol allows cells to be received at the destination out of order and reordered before being presented to the receiving application ATM can be transported at many rates and over a wide variety of media ATM protocol is implemented over copper and fiber at rates from about 25 Mbps to over 2 Gbps Because the protocol is not dependent on a particular connection scheme, many ATM-based technologies have emerged under the ATM umbrella They are not the same, and should be treated as separate topologies that share a common link basis Fiber implementations of ATM often run at SONETt physical parameters, such as 155 Mbps OC3 and 24 Gbps OC48 Copper implementations have been intro-
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