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When designing an Ethernet network, most network engineers use a basic set of cabling guidelines specified by the Ethernet standards. For example, the 10 Mbps Ethernet standard uses the 5-4-3 rule, which says that a network can consist of no more than five network segments, connected by four repeaters, with no more than three of those segments being mixing segments. There are, however, more exacting formulae in the Ethernet standards that add the lengths of the individual cable segments and a coefficient for each hub to arrive at a more precise configuration for the network. In other words, using the more complex formula, you might discover that you are able to exceed the number of hubs specified in the basic Ethernet guidelines if the lengths of your cables are short enough. When designing a complex Ethernet network, you should consult the Ethernet standards and use the more precise formula to ensure that your design falls within the specified requirements.

Fiber Optic Although it can use the same topology and many of the same data-link layer protocols support it, fiber-optic cable operates on a different principle than UTP and all other copper-based cables. The actual network medium in a fiber-optic cable is a strand of plastic or glass that carries signals in the form of light pulses. Because the signals are not electric, they are immune to electromagnetic interference. In an environment where interference levels are high, such as a factory floor, fiber-optic cable can eliminate the performance degradation that the interference causes on copper cable. Even in a normal office environment, you can install fiber-optic cable near fluorescent light fixtures or electric motors without any difficulties. When using UTP, your network design should keep the copper cables a safe distance away from these possible sources of interference.

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Because you would want to start trapping errors as quickly as possible, the On Error state ment should be at the beginning of the procedure. Also, you are not limited to only a single error handler per procedure; you could specify different error handlers as the procedure progresses, even returning to earlier error handlers. The following code fragment illustrates one way to construct a series of error- handling routines:

1-17

On Error GoTo ErrorHandler1 [statements] On Error GoTo ErrorHandler2 [statements] On Error GoTo ErrorHandler1 [statements] ErrorHandler1: [errorhandler1 statements] ErrorHandler2: [errorhandler2 statements]

Fiber-optic cables are also much less susceptible to attenuation than copper cables. Attenuation is the tendency of a signal to weaken as it travels along a medium. This signal weakening is one of the main reasons for the 100-meter UTP-cable length limit. All fiber-optic cables can exceed UTP cables in length, but there are several different types of fiber-optic cable, each with different length limitations. The multimode fiberoptic cable typically used on LANs can span distances ranging from 400 to 2,000 meters, while single-mode fiber can support cable runs as long as 100 kilometers. In performance and flexibility, fiber-optic cable is superior to UTP in almost every way. Fiber-optic cable is inherently more secure than copper cables because unauthorized people cannot easily tap into the cable and intercept its signals as they can with copper. The drawback of the medium is its additional cost and the special skills required to install and maintain it. Virtually all the tools used to install and test fiber-optic cable are different from those for copper-based cables. Installers must glue the connectors onto a fiber-optic cable typically using a heat-cured glue and a small oven while UTP connectors are crimped onto the cable. Also, because of the way light pulses are transferred through the cable, fiber-optic installers must be careful not to bend the cable too sharply. The raw materials for a fiber-optic installation are far more expensive than their UTP counterparts. There are also far fewer fiber-optic installation contractors than UTP experts, and their skills come at a premium. In addition, many network administrators who have the ability to make minor repairs on UTP cables would be lost when faced with a malfunctioning fiber-optic connection.

public void Add(string key, ModelState value); public void Add(KeyValuePair<string, ModelState> item);

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