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Figure 3-35 Uninterruptible Power Supply, or UPS.
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Third, the UPS system initiates the automatic startup of the building s turbine, a massive jet engine that can be spun up in about a halfhour. The turbine is either in a soundproof room in the basement (see Figure 3-36) or in an enclosure on the roof of the building (see Figure 3-37). Once the turbine has spun up to speed, the building s power load can slowly be shed onto it. It will power the building until it runs out of kerosene, but most buildings have several day s supply of fuel in their underground tanks. As Al Bergman, a data center design engineer and friend told me several years ago, If we re down so long that we run out of fuel, our problems are far worse than an office that s out of service. Returning now to our copper facilities, the cables leave the cable vault via ducts and travel upstairs to whichever floor houses the Main Distribution Frame (MDF). The MDF, shown in Figure 3-38, is a large iron jungle gym sort of frame that provides physical support for the thousands of
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 3-36 CO Turbine.
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Figure 3-37 Turbine in rooftop enclosure.
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pairs of wire that interconnect customer telephones to the switch. The cables from the cable vault ascend and are hardwired to the vertical side of the MDF, shown in Figure 3-39. The ends of the cables are called the cable heads. The vertical side of the MDF has additional overvoltage protection, shown in the figure. The arrays of plug-ins are called carbons; they are simply carbon fuses that open in the event of an overvoltage situation and protect the equipment and people in the office. A close-up of carbons is shown in Figure 3-40.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 3-38 Main Distribution Frame, or MDF .
Figure 3-39 Vertical side of MDF showing , protectors.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 3-40 Close-up of carbons.
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The vertical side of the MDF is manually wired to the horizontal side. The horizontal side, shown in Figure 3-41, is wired to the central office switch line units. Notice the mass of wire lying on each shelf of the frame; these are the cable pairs from the customers served by the office. Imagine the complexity of troubleshooting a problem in that hairball. I have spent many hours up to my shoulders in wire, tugging on a wire pair while a technician 50 feet down the frame, also up to his elbows in wire, feels for the wire that is moving so it can be traced. The horizontal side also provides craft/technician access for repair purposes. In Figure 3-42, Dick Pecor has connected a test set to the appearance of a line unit and is listening for a dial tone. From the mainframe, the cable pairs are connected to the local switch in the office. Remember that the job of the local switch is to establish temporary connections between two customers that want to talk, or between two computers that want to spit bits at each other. The line units (LUs) on the switch provide a connection point for every cable pair served by that particular switch in the office. Conceptually, then, it is a relatively simple task for the switch to connect one subscriber in the switch with another subscriber in the same switch. After all, the switch maintains translations a directory, if you will so it knows the subscribers to which it is directly connected. Far more complicated is the task of connecting a subscriber in one switch to a subscriber in another. This is where network intelligence becomes critically important. As mentioned earlier, when the switch receives the dialed digits, it performs a rudimentary analysis on them to
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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