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Frame Relay is a fast packet-switching technology introduced in 1992 Its installed base has skyrocketed since its development and introduction in the industry No one could have ever predicted just how popular this technique would become, but the final outcome is that Frame Relay has become the bread and butter service for many carriers The reason is not as simple as one might believe; therefore, this chapter will explore the details of what has led to the popularity in Frame Relay installations Moreover, some carriers have encountered problems with their installations because they did not understand the benefits or the operations of a Frame relay service Unfortunately, this is the epitaph of the Telecommunications industry: the carriers (and specifically the long-distance carriers) do not understand data communications! Yes, they have some talented people on their staff, but they have always stifled these individuals who knew what was happening Instead, the carriers let the voice and engineering folks become the spokespersons for the carriers in a data communications arena How sad, they just never really got the point Now in an era when all the voice carriers are trying to become data-literate and the data carriers are trying to become voice-literate, the voice people stand to lose in the overall transition because of the innate ability to mess up the data installation Whenever we hear about a carrier s capability to handle data traffic, we seem to be mesmerized by the carrier s overall capabilities, instead of understanding specific characteristics for processing and delivering data communications

In an AM radio system, the strength of the transmitted radio signal is varied to encode the control information This means that the radio signal is being switched between high and low power output levels to encode the pulse data stream AM radio transmission is inexpensive and easy to implement electrically, but it is highly susceptible to radio interference The AM transmitter sends each channel s servo position as an analog pulse with a width that varies from 1 to 2 milliseconds All the pulses are transmitted as a continuously on radio frequency (RF) carrier, with each channel s beginning and ending marked by an off for 035 millisecond All the channels are sent sequentially with the 35-millisecond end mark between each channel serving as the beginning mark of the next channel A special framing pulse designates the beginning of the channel series by resetting the receiver The receiver uses the marks to determine which servo to control based on the proper 1- to 2-millisecond command pulse Any radio interference could be interpreted as a marker and cause the servos to go to a wrong position or to sit and jitter erratically Using AM, any electrical noise from electric motors, fluorescent lights, or gasoline engines, for example, can cause unwanted movement of the robot because the electrical noise can be added to the original AM transmitting signal Because AM receivers interpret the intensity of the incoming radio signal as specific information, they have trouble distinguishing electrical noise from the actual transmitted signals This results in the receiver sending false signals to the motor controllers and servos Because AM radios may cause uncontrolled movement in combat robots, most competitions prohibit the use of AM radios entirely

The next step in the configuration of Planning Server is adding the users Users must be imported or added to Planning Server before they can be assigned to roles or access data through the front-end Excel forms The fourth link on the left pane of the Planning Administration Console page is called Users This link opens the Users Management page, as shown in Figure 7-6 There are two options available at the bottom of this page to add users to the Planning Server: Add and Import

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A more robust and reliable method for transmitting control signals is to use frequency modulation (FM) In an FM radio system, the amplitude of the signal is held constant, and the transmitted information is encoded by varying the frequency of the transmitted carrier signal The FM receiver locks onto the constant

Figure 7-6