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Stackable switches, shown in Figure 5-12, are similar in appearance to stand-alone switches, and the only real difference is that the backplanes of stackable switches can be connected Stackable switches can be stacked six to eight switches high and cost from $30 to $150 per port depending on the speeds and features they include, such as fiber-optic ports, 10G Ethernet ports, management, Power over Ethernet (PoE) for distributing electrical power over the Ethernet cable, OSI Layer 3 and even 4 functionality, and various built-in security features Modular Switches A modular switch, also called an enterprise switch, is really a large chassis or cabinet with a power supply and backplane into which you can plug many different boards, including hubs, switches, bridges, and routers, as shown in Figure 5-13 By using a single backplane, modular switches get around the two- or four-layer limit, as do stackable switches Modular switches actually preceded stackable switches, and in the less-demanding roles (where all you need are the switch functions), stackable switches are now being used where modular switches once were, because a stackable switch is much cheaper There are many forms of modular units, because you can buy the modules you want to use (hubs, switches, bridges, or routers) and plug them into a modular backplane that can span one network segment, multiple network segments, or multiple networks Basically, you buy a chassis with power supply and then buy the modules you need to build the device that fits your network requirements Modular switches provide a lot of flexibility, but at a steep price In addition to flexibility, modular switches provide another very significant benefit, called a collapsed backbone If the modules were separate devices, you would connect

Try This!

The materials you need for this lab are A working computer running Windows 2000, Windows XP, or Windows Vista

5:

Got an old portable PC battery lying around Well, you ve got to get rid of it, and since there are some pretty nasty chemicals in that battery, you can t just throw it in the trash Sooner or later, you ll probably need to deal with such a battery, so try this: 1 2 Do an online search to find the battery recycling center nearest to you Sometimes, you can take old laptop batteries to an auto parts store that disposes of old car batteries I know it sounds odd, but it s true! See if you can find one in your area that will do this Many cities offer a hazardous materials disposal or recycling service Check to see if and how your local government will help you dispose of your old batteries

In general, keep in mind the following basics First, always store batteries in a cool place Although a freezer is in concept an excellent storage place, the moisture, metal racks, and food make it a bad idea Second, condition your Ni-Cd and Ni-MH batteries by using a charger that also conditions the battery; they ll last longer Third, keep battery contacts clean with a little alcohol or just a dry cloth Fourth, never handle a battery that has ruptured or broken; battery chemicals are very dangerous Finally, always recycle old batteries

Figure 5-13 3Com Switch 7757 Modular LAN Switch*

Many different parts are included in the typical laptop, and each part uses power The problem with early laptops was that every one of these parts used power continuously, whether or not the system needed that device at that time For example, the hard drive would continue to spin whether or not it was being accessed, and the LCD panel would continue to display, even when the user walked away from the machine The optimal situation would be a system where the user could instruct the PC to shut down unused devices selectively, preferably by defining a maximum period of inactivity that, when reached, would trigger the PC to shut down the inactive device Longer periods of inactivity would eventually enable the entire system to shut itself down, leaving critical information loaded in RAM, ready to restart if a wake-up event (such as moving the mouse or pressing a key) would tell the system to restart The system would have to be sensitive to potential hazards, such as shutting down in the middle of writing to a drive, and so on Also, this feature could not add significantly to the cost of the PC Clearly, a machine that could perform these functions would need specialized hardware, BIOS, and operating system to operate properly This process of cooperation among the hardware, the BIOS, and the OS to reduce power use is known generically as power management