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Medium-priced testers (~$400) certainly test continuity and wiremap and include the additional capability to determine the length of a cable, and can even tell you where a break is located on any of the individual wire strands This type of cable tester (Figure 6-47) is generically called a time domain reflectometer (TDR) Most mediumpriced testers come with a small loopback device to insert into the far end of the cable, enabling the tester to work with installed cables This is the type of tester you want to have around! If you want a device that fully tests a cable run to the very complex TIA/EIA standards, the price shoots up fast These higher-end testers can detect things the lesser testers cannot, such as crosstalk and attenuation

We have already seen that abstraction plays a key role in making CTI possible In fact, with just a few simple constructs (devices, elements, components, appearances, calls, and connections) and a reasonably small vocabulary of types, states, and attribute values, we have been able to describe and model the vast majority of telephony functionality with little effort

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Crosstalk poses a threat to properly functioning cable runs Today s UTP cables consist of four pairs of wires, all squished together inside a plastic tube When you send a signal down one of these pairs, the other pairs pick up some of the signal, as shown in Figure 6-48 This is called crosstalk

/* display a table of squares and cubes */ for(i=1; i<20; i++) printf("%8d %8d %8d\n", i, i*i, i*i*i); return 0; }

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By translating into specific parameter values all references to parts of the abstraction and their state, status, or setting, any activity within a telephone system, desired or actual, can be described precisely Our abstraction of telephony resources, features, and services now can be expressed in concrete terms through parameters that are placed into messages This is illustrated in Figure 64

A sample of its output is shown here:

Every piece of UTP in existence generates crosstalk Worse, when you crimp the end of a UTP cable to a jack or plugs, crosstalk increases A poor-quality crimp creates so much crosstalk that a cable run won t operate at its designed speed To detect crosstalk, a normal-strength signal is sent down one pair of wires in a cable An electronic detector, connected on the same end of the cable as the end emanating the signal, listens on the other three pairs and measures the amount of interference, as shown in Figure 6-49 This is called near-end crosstalk (NEXT)

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A general goal for implementing CTI interfaces is allowing any combination of hardware and software components to be assembled into a CTI system of any size Even the smallest CTI system is made up of many components, and this means that the system itself contains multiple CTI interfaces A CTI interface is needed between each CTI component that must be integrated with another Figure 6-5 builds on the example we viewed earlier While this example is among the simplest of all CTI systems, it still involves three distinct components: The telephone The computer The CTI software running on the computer

Now that the network is completely in place, it s time to turn to the final part of any physical network: the NICs A good network tech must recognize different types of NICs by sight and know how to install and troubleshoot them Let s begin by reviewing the differences between UTP and fiber-optic NICs All UTP Ethernet NICs use the RJ-45 connector The cable runs from the NIC to a hub or a switch (Figure 6-55) It is impossible to tell one from the other simply by looking at the connection

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