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Gigabit and 10 Gigabit Cabling Technology
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Fiber Gigabit and 10 Gigabit Ethernet Copper Gigabit and 10 Gigabit Ethernet Ethernet in the First Mile (EFM) ATM and optical carrier (OC) standards TIA wiring standards Augmented Category 6/ClassE (AC6) and Category 7/ClassF RJ and non-RJ Category 7 connectors
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In this chapter, we will cover the special structured cabling techniques you must employ to support gigabit and 10 Gb speeds In the local area network (LAN), Ethernet is clearly the primary topology for these speeds, so we will concentrate on the structured cabling standards that support Gigabit Ethernet and 10 Gigabit Ethernet ATM at OC-12c is another topology that is available, although it is not quite gigabit speed Likewise, OC-192 is virtually 10 Gb, too, but these technologies can be supported in the LAN with the same techniques we use for comparable Ethernet speeds Gigabit structured cabling techniques will be covered first, and the 10 Gb techniques will be covered later in the chapter Gigabit refers to a data transfer speed of 1,000,000,000 bits per second, or 1 Gbps The corresponding Ethernet technology meets this definition exactly; it operates at 1 Gbps Technically, ATM at OC-12c is at 622 Mbps data rate, so it is about two-thirds gigabit speed In fact, the standards revision TIA-568-A (and now TIA568-C as well) incorporates wiring technologies that accommodate both of these gigabit-class speeds This standard specifies the provision of two cables to each workstation outlet, one of which may be fiber Although it is up to the cabling system designer to include the fiber, the provision of multimode fiber makes it easy to implement either of the common gigabit-class technologies, Gigabit Ethernet or ATM/OC-12c But, what about copper Well, thanks to the tight specifications of this standard, we are now using Category 5e and higher cabling for gigabit copper networks for both Ethernet and ATM-622 Network speeds go up by a factor of 10 about every five years (Fig 121) 10 Gigabit refers to a data transfer speed of 10,000,000,000 bits per second, or 10 Gbps In the LAN, 10 GigE (as it is often called) Ethernet operates at that
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FIGURE 121 Time-speed curve
Gigabit and 10 Gigabit Cabling Technology
exact throughput There is another interface that is normally internal to equipment, which splits the data into four 25 Gbps signals that are combined by an interface adapter into the 10 Gb stream ATM s OC-192 is very close, but not exactly 10 Gbps The optical carrier OC rates are exact multiples of 5184 Mbps (essentially OC-1) Thus, 192 5184 995328 Mbps, or 995328 Gbps This is close enough for our purposes, and certainly close enough to be called 10 Gb
Gigabit Ethernet
Gigabit Ethernet is formally specified in the supplement to the base 8023 standard known as IEEE 8023z, which includes the fiber implementations, and in IEEE 8023ab for twisted-pair copper It is sometimes referred to as 1000Base-X The X signifies a physical layer based on the ANSI X3230 Fibre Channel1 standard, in the same manner that 100Base-X fiber modes were based on the FDDI physical layer The choice of Fibre Channel signaling was made simply to expedite the introduction of the Gigabit Ethernet technology At the time of first consideration of expanding Ethernet operation to the gigabit range, Fibre Channel existed as an accepted standard More importantly, integrated circuits existed to implement the signaling, so it was very time- and cost-effective to utilize the same basic circuitry The signaling rate was modified to allow for an 8-line by 125 Mbps interface to achieve a data rate of exactly 1000 Mbps The actual medium-independent layer of Gigabit Ethernet is the 8-bit-wide gigabit media independent interface (GMII), corresponding to the MII in Fast Ethernet and the AUI in standard Ethernet Gigabit Ethernet is topologically similar to Fast Ethernet (100BaseT) All workstations connect directly to a switch or hub, and collision domains are tightly controlled to allow the collision-detection mechanism to operate properly As a matter of fact, shared-medium operation of Gigabit Ethernet is virtually absent, as Gigabit Ethernet switches are used in most hub-type applications In essence, the switch is an OSI Layer 2 bridge that operates much like its lower speed, multiport counterparts Gigabit Ethernet was originally specified as a fiber-optic topology, because the bulk of installed cabling at the time was only Category 3 Cat 3 simply was not capable of carrying the higher symbol rates needed to support 1 Gbps data Today, all of the newly installed cabling is Cat 5e or above, which makes a copper implementation possible
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