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You should be able to determine what router commands you can use to troubleshoot problems at the various OSI Reference Model layers. Know how CDP, including its timers, works and the kinds of information shared between directly connected Cisco devices. Be able to display the CDP tables on an IOS device and understand their output. Know how to troubleshoot layer 3 problems with ping and traceroute, starting with testing of the TCP/IP protocol stack on a user s computer. Understand the different message responses you can see when using the ping command and what they mean from a troubleshooting perspective. You should know how to configure your VTYs to allow telnet access, and be able to determine whether this is not set up correctly. Remember how to suspend a telnet from an IOS device, resume it, and display your open sessions. Know how to disable debug commands on your IOS device.

Console.Out and Console.Error are objects of type TextWriter. Console output is most easily accomplished with Write( ) and WriteLine( ), with which you are already familiar. Versions of these methods exist that handle output for each of the built-in types. Console defines its own versions of Write( ) and WriteLine( ) so that they can be called directly on Console, as you have been doing throughout this book. However, you can invoke these (and other) methods on the TextWriter that underlies Console.Out and Console.Error if you choose. Here is a program that demonstrates writing to Console.Out and Console.Error. By default, both write output to the console.

Notice that the static integer num is both declared inside the ShareVar class and defined as a global variable. As stated earlier, this is necessary because the declaration of num inside ShareVar does not allocate storage for the variable. C++ initializes num to 0 since no other initialization is given. This is why the first calls to shownum( ) both display 0. Next, object a sets num to 10. Next, both a and b use shownum( ) to display its value. Because there is only one copy of num shared by a and b, both cause the value 10 to be displayed.

which then converts this data into commands the servos and speed controllers understand. Other controllers, such as the Handy Board, take programs that can be used to alter output results based on input results. Users download a piece of code to the controller, and the code then runs on the Handy Board to control the robot. Still other microcontrollers offer reactive mechanisms that automatically manage outputs based on inputs such as the thermostat in your house, which senses its environment and controls the furnace to keep your house at a comfortable temperature, and sometimes adjusting for times of the day when you are not home or asleep, to conserve energy. The OOPic and BrainStem controllers affect this type of control, called virtual circuits and reflexes, respectively. Some controllers can exhibit more than one type of control, and some can even perform multiple tasks at the same time. You may have robots in your lives that you may not have thought of as robots. Consider a bread maker that knows the time, can mix various bread recipes, can sense heat, and can create auditory output with beeps and displays to inform you what is happening at all times. Some cars have anti-lock brake systems (ABS) that can sense each wheel s rotation and adjust the braking pressure so the wheels don t lock and skid, even pumping the brakes for maximum stopping power on wet and slippery roads. The details of how to design electronic circuits using microcontrollers, how to write programs, and how to implement the microcontroller is beyond the scope of this book. You ll find many different books that have been written about various types of microcontrollers and programming techniques to help you. Appendix B lists some excellent books on microcontrollers. Some microcontrollers are simple to get started with, and some are so powerful that they require prior microcontroller experience to use them properly.

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Organization ID is used to differentiate between different authoring vendors, or producers. Alternatively, the Organization ID could also be used as a differentiator between different product categories of a given studio. For example, children s discs could use a different Organization ID than mature content discs. The third security level is the Disc ID, which differentiates between different discs by a given studio and authoring facility. This kind of structure helps to manage the content of discs and keeps them organized. It should be mentioned that a disc is only allowed to access the content of its own tree. In other words, a disc can access the data stored in its own Disc ID directory, its Organization ID directory, and the root certificate directory. This allows for sharing assets across multiple discs of the same category. As an example, if multiple children s discs of a given studio should share the latest trailers, it probably makes sense to store them in the area of the Organization ID, where each disc underneath can access them. On the other hand, if the trailers were stored in the disc-specific area of the local storage, another disc would not be able to access the data, unless specific credentials allowed for it.

No single cam form is best for all applications. A form that is optimized for its response spectrum in certain frequency regions will not be optimized for response in others. Other complicating factors that are dif cult to account for are variations in external loads, torque uctuations, fabrication errors, and alignment and other inherent factors. Good performance in the eld is the nal test that the system design is a good one.

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