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Token Ring is a physical and data-link layer technology similar to Ethernet However, unlike Ethernet, Token Ring connects devices in a LAN based on a logical ring and a token-passing environment In this environment, a small token is passed from node to node The node having the token in its position has the rights to transmit data If it has no information to send, it passes the token on to the next node TOKEN RING CABLE PINOUTS A Token Ring environment uses two types of cabling: Shielded Twisted Pair (STP) and Unshielded Twisted Pair (UTP) Shielded Twisted Pair (STP) Table 4-10 shows the pinout for Token Ring STP ports DB-X stands for a data bus connector This is a type of connector that is used to connect serial and parallel cables to a data bus DB connector names are in the format DB-x, where x represents the number of wires within the connector Each line is connected to a pin on the connector; but in many cases, not all pins are assigned a function DB connectors are defined by various EIA/TIA standards Table 4-10: Token Ring DB-9 Pinout for STP Port

Officially, 10BaseT requires the use of CAT 3 (or higher), two-pair, unshielded twistedpair (UTP) cable One pair of wires sends data to the hub while the other pair receives data from the hub Even though 10BaseT only requires two-pair cabling, everyone installs four-pair cabling to connect devices to the hub as insurance against the possible requirements of newer types of networking (Figure 4-8) Most UTP cables come with stranded Kevlar fibers to give the cable added strength, which in turn enables installers to pull on the cable without excessive risk of literally ripping it apart

f (z ) dz = dz dz = F (z ) a = F (b) F (a)

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10BaseT also introduced the networking world to the RJ-45 connector (Figure 4-9) Each pin on the RJ-45 connects to a single wire inside the cable; this enables devices to put voltage on the individual wires within the cable The pins on the RJ-45 are numbered from 1 to 8, as shown in Figure 4-10 The 10BaseT standard designates some of these numbered wires for specific purposes As mentioned earlier, although the cable has four pairs, 10BaseT uses only two of the pairs 10BaseT devices use pins 1 and 2 to send data, and pins 3 and 6 to receive data Even though one pair of wires sends data and another receives data, a 10BaseT device cannot send and receive simultaneously

(614)

Unshielded Twisted Pair (UTP) Table 4-11 shows the pinouts for Token Ring UTP ports Table 4-11: Token Ring DB-9 Pinout for UTP Port

The rules of CSMA/CD still apply: only one device can use the segment contained in the hub without causing a collision Later versions of Ethernet will change this rule An RJ-45 connector is usually called a crimp, and the act (some folks call it an art) of installing a crimp onto the end of a piece of UTP cable is called crimping The tool used to secure a crimp onto the end of a cable is a crimper Each wire inside a UTP cable must connect to the proper pin inside the crimp Manufacturers color-code each wire within a piece of four-pair UTP to assist in properly matching the ends Each pair of wires consists of a solid-colored wire and a striped wire: blue/blue-white, orange/orange-white, brown/brown-white, and green/green-white (Though viewing Figure 4-11 in black and white makes it a little tough to see the variations!)

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NOTE The real name for RJ-45 is 8 Position 8 Contact (8P8C) modular plug The name RJ-45 is so dominant, however, that nobody but the nerdiest of nerds call it that Stick to RJ-45 The Telecommunications Industry Association/Electronics Industries Alliance (TIA/EIA) defines the industry standard for correct crimping of four-pair UTP for 10BaseT networks Two standards currently exist: TIA/EIA 568A and TIA/EIA 568B Figure 4-12 shows the TIA/EIA 568A and TIA/EIA 568B color-code standards Note that the wire pairs used by 10BaseT (1 and 2; 3 and 6) come from the same color pairs (green/greenwhite and orange/orange-white) Following an established color-code scheme, such as TIA/EIA 568A, ensures that the wires match up correctly at each end of the cable

To prove this result, we use F ( z ) = U + iV We are assuming that f and F are analytic Now, using the results of Chap 3 we know that f (z) = and so U dF U V V i = = +i y dz x x y

Figure 4-12 The TIA/EIA 568A and 568B standards (with labels to help you see the colors)

Ground Ground TX RX TX RX Ground -