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Implementing Fast Ethernet

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Implementing Fast Ethernet Implementing Fast Ethernet R The Next Generation of Ethernet In this paper, each of these cable methods are Fast Ethernet (also known as IEEE 802.3u or explored in depth, as are migration strategies 100BASE-T) is quickly becoming the successor from 10 Mbps coax and 10BASE-T Ethernet to Ethernet as the network topology of choice. networks. Fast Ethernet can operate at ten times the speed of Ethernet, and in many cases, the 100BASE-TX and 100BASE-T4 existing twisted pair cable (10BASE-T, or Twisted Pair Cabling Token Ring) can be used in the migration to The Fast Ethernet standard provides for three Fast Ethernet. distinct cabling systems. Each system has merit, and is appropriate in different situations. For The importance of Fast Ethernet is becoming twisted pair copper cabling, the standards are clearer each day. So too are its benefits. Fast 100BASE-TX and 100BASE-T4. For fiber optic Ethernet can deliver next generation perfor- cabling , the standard is 100BASE-FX. These mance and compatibility for traditional cable systems can be intermixed within an Ethernet networks with reasonable installa- organization, and in combination, they address tion and implementation costs. virtually all cabling needs. While Fast Ethernet’s momentum and benefits The 100BASE-TX method requires two pairs of may be clear, there are still many networking high-quality twisted pair wiring (one for trans- professionals who have questions about imple- mission and one for reception). This cable type menting Fast Ethernet—particularly about can be either unshielded twisted pair (UTP) or what type of cables to use. shielded twisted pair (STP) cabling, providing it meets the required performance specifica- The 100BASE-T Standard tions. The most common examples of cable Fast Ethernet is now a fully ratified IEEE that meet these requirements are Category 5 (Institute of Electrical and Electronic Engi- UTP and IBM Type 1 STP. (These cable types neers) standard, having passed a full review in are explained in more detail later.) June 1995. The standard has been assigned the name 802.3u, or 100BASE-T as it is more com- The 100BASE-T4 method requires four pairs of monly called. “ordinary” quality twisted pair wiring. In this method, one pair is dedicated to transmission, The term “100BASE-T” refers not to the type one pair is dedicated to reception, and two of cable itself, but rather to the way the cable pairs are “bi-directional.” By dividing the same is used. Like 10BASE-T, 100BASE-T uses the 100 Mbps data signal over three pairs of cable, CSMA/CD (Carrier Sense Multiple Access/ (in each direction), the effective data rate Collision Detection) method to arbitrate access remains the same, but the cable frequency is to the cable. The terms “100BASE-TX”, much lower. This means that a less sophisticat- “100BASE-T4”, and “100BASE-FX” refer ed cable can be used. This type of cable is specifically to the method of implementing sometimes referred to as “voice grade” cable. 100BASE-T. Most commonly, this will mean Category 3 UTP. It is very important to note however, that 100BASE-T4 is not limited to voice grade cable. It can be used equally well on better quality cable including Category 4 UTP, Category 5 UTP, and Type 1 STP. 1 specific connectors for use with twisted pair There is no clear right or wrong in cable. For CAT 3, CAT 4, and CAT 5, this stan- dard is EIA-568, and specifies an RJ-45 connector. choosing between 100BASE-TX and For Type 1 cable, this is a DB9 connector. 100BASE-T4. Which system is right for Most Ethernet installations use cable based on any given network will depend on EIA standards, and most installations of IBM and/or Token Ring equipment tend to use cable several factors. that meets the IBM cable standards. The notable exception is many Token Ring installations which are installed using CAT 4 UTP cable. TIA/EIA Cable Specifications Category (CAT) Description Advantages of 100BASE-TX and CAT 1 Telephone service and low speed data 100BASE-T4 CAT 2 ISDN and T1/EI Both 100BASE-TX and 100BASE-T4 have their CAT 3 Data at up to 16 MHz place in Fast Ethernet networks. In fact, many (including 10BASE-T at 10 Mbps and networks will have a mixture of the two meth- 100BASE-T4 at 100 Mbps) ods. In order to understand where each option should best be used, it makes sense to first CAT 4 Data at up to 20 MHz examine the relative advantages and disadvan- (including Token Ring at 16 Mbps and tages of each: 100BASE-T4) CAT 5 Data at up to 100 MHz Advantages of 100BASE-T4 (including 100BASE-TX and • Operates on virtually any preexisting twisted 100BASE-T4 at 100 Mbps) pair cabling • Adapters are about 10% less expensive Twisted Pair Cable Standards • Less expensive CAT 3 cabling can be used Demystified Advantages of 100BASE-TX There are two general sources of specifica- • Uses only two pairs of twisted pair tions for twisted pair cabling. These are the • Supports Full Duplex mode for up to Telecommunications Industry Association 200 Mbps in servers (TIA) branch of the Electronic Industries Asso- ciation, (EIA), referred to as the EIA/ Disadvantages of 100BASE-T4 TIA (or simply the EIA), and IBM. • Cannot support Full Duplex mode (unneeded in workstations) The EIA is responsible for the “CAT” or Cate- • Requires four pairs of wiring gory cable standards (see Table 1). (The terms “Category” and “Level” are sometimes used Disadvantages of 100BASE-TX interchangeably.) IBM is responsible for the • All patch panels and jumper blocks must “Type” cable standards, such as IBM Type 1, be CAT 5 Type 2, etc. • Adjacent cable pairs cannot be used for other applications Strictly speaking, the cable specification does • Full Duplex mode requires Full Duplex not include the connector used to terminate the switches cable, however, both the EIA and IBM define 2 Choosing between 100BASE-TX electromagnetic immunity, and increased and 100BASE-T4 security. It also uses the same type of fiber There is no clear right or wrong in choosing optic cable as 10BASE-FL and FDDI. between 100BASE-TX and 100BASE-T4. Which system is right for any given network, will Like 10BASE-T, 100BASE-T allows a maxi- depend on several factors: mum distance between a repeater (hub) and a node of 100 meters. Using fiber optic cable, Installed cable type 100BASE-FX increases this distance to a maxi- If properly installed CAT 5 or Type 1 is not mum of 185 meters. Between a server and available, then 100BASE-T4 must be chosen, workstation (with no repeater), the maximum or new twisted pair wiring installed. distance is increased to 400 meters, or even 2 kilometers when using Full Duplex mode. Budget Substantial amounts of money may be saved if The standard cable type for 100BASE-FX is 100BASE-T4 adapters and CAT 3 cabling can multimode fiber with a 62.5 micron core and be used. (A quick survey of cable costs shows 125 micron cladding. Only one pair of fibers four-pair CAT 3 plenum cable priced at $.09- is required, one for transmission and one for .25/ft., and four-pair CAT 5 plenum cable at reception. This is the cable that is commonly $.23-.37/ft.) used in 10BASE-FL Ethernet networks with “ST” bayonet-style connectors. The new EIA- Future needs preferred connector is the “SC” plug-style. If Full Duplex mode is required, or desired The SC connector has the advantage of being in the future, 100BASE-TX provides the flexi- a push-on/pull-off connector (no twisting), bility required. If the quality of the cable and since it is keyed, there is no possibility of installation(s) is unknown or questionable, incorrectly connecting the transmit and receive then 100BASE-T4 provides the flexibility cables. If the fiber optic cable is already termi- needed to run on more cable types. nated with FDDI compatible “MIC” connec- tors, then an inexpensive MIC to ST converter One conclusion that can be drawn from this can be used. analysis is that 100BASE-T4 is best suited for use in workstations, where cost is an important The 100BASE-FX standard will best apply in issue. 100BASE-TX is more desirable in network the interconnection of repeaters to form a fiber servers that can take advantage of Full Duplex optic backbone. In a typical company, there Fast Ethernet (FDFE) mode, and where the will be Fast Ethernet repeaters on each floor or quality of the cabling can be easily controlled. in each department that support 100BASE-TX or 100BASE-T4 workstations. The repeaters are then interconnected using 100BASE-FX The 100BASE-FX Fiber Optic links. When connecting repeaters on different Option floors, the fiber optic cabling will provide Until now, we have not considered the role protection from electromagnetic noise that is of fiber optic cabling in the Fast Ethernet net- often associated with elevators, and will also work. Fiber has the same advantages in FDFE enable longer cable runs between buildings. as it does in traditional Ethernet (10BASE-FL), and FDDI networks: extended distances, 3 Migration Strategies Today, many networks are based on twisted RJ-45 RJ-45 Pin Number Pin Number pair cabling, and on thin coax with BNC con- 1 8 nectors. Clearly there must be a strategy that 2 7 will allow today’s networks to smoothly 3 6 migrate to Fast Ethernet. In order to protect 4 5 their investments, buyers’ should consider 5 4 AutoSense network adapters for their worksta- 6 3 tions.
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