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One can see the reason why the gigabit Ethernet proponents support a simpler and less expansive set of protocols when dealing with LAN technologies, now moving toward a WAN protocol with Layer 3 switching being developed The problem with ATM is that in order to support the older legacy systems, many protocol points and interfaces are necessary To get around the problem of fork lift changes, the necessary protocols have been developed Due to its protection mechanism for existing systems, ATM is its own undoing from the opponents of the technique Too often the opponents cite the different protocols needed, instead of what they are actually doing However, the use of each of these protocols satisfies a specific need and should not be taken strictly as an overhead problem, but as an interworking function If all one can do is complain about the various protocols, then the true benefit of ATM is lost in the mire

The Connect dialog box (shown as an insert) opens up as the first step in establishing a connection to a PPS Planning Server The second insert shows the list of applications and model sites stored on the Planning Server

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ATM uses one of two connection types The protocol is connection-oriented, so the two choices are a PVC or a SVC There is actually no permanency to the circuits They are logically mapped through the network and are used when needed for PVC or dialconnected when using the SVC In either case, the carriers promise only to make a best attempt to serve the needs of the end user when the time is appropriate With no true guarantees, the consumer is at risk (sort of) However, the concept is that the network provider will provide a committed bandwidth available to the user on-demand whenever the user wishes to use it This forms the basis of what ATM networks are all about: ondemand, high-speed communications networks The connection is built into a routing table in each of the switches involved with the connection from end to end As such, the switches only need to look up a table for the incoming port and channel, and then determine the mapping (in the same table) for the output port and channel Using virtual path identifiers (VPI) and virtual channel identifiers (VCI), the carrier maps the table, as shown in Figure 11-4

every microcontroller can receive and transmit serial communications data Because of this, operator interfaces and robot controllers can be designed to transmit and receive serial communications, and the radio modems can be used to transmit the data between them A simple operator interface can be a microcontroller, such as the Basic Stamp or the Motorola 68HC11, to read in analog data from a joystick and digital data from a weapons switch, and to convert that data into serial communications data that can be transmitted The robot controller can also use the same type of microcontrollers to convert incoming serial data to output digital signals for turning on and off solid-state relays for weapons and generate the 1- to 2-millisecond pulse modulation that motor controllers use to drive the robot s motors The details of how to create the specific subsystems is outside the scope of this book, but in Appendix B you ll find several references to books that will explain how to build the various components that can be used in your own custom combat robot R/C system It is recommended that beginning robot builders use either a traditional R/C system or the IFI Robotics Isaac system If you try to build your own R/C system, you will eventually end up with something that is functionally similar to the Isaac system, and you might end up spending most of your time building the remote control system For those of you who really want to build you own custom remote-control systems, research FCC rules on radio communications, seriously consider using radio modems, and remember safety is the number-one consideration that must be built into controllers You must have failsafe and interference-handling features built into the control system, or you will not pass safety inspections In addition, some competitions require noncommercial custom radio systems be separately pre-approved, far in advance of the actual event.

Figure 11-4: ATM table lookup maps the input and output channels The structure of the link is shown in Figure 11-5 , where a full virtual connection is mapped through the various switches across the network Here the end-user device is connected across an ATM access link through a switch The switches provide the cross connection and link to the next downstream node Note that the connection from the end user to the network may be on a T1, T3, or OC-n From the first switch out, the network will use SONET or Synchronous Digital Hierarchy (SDH) capabilities possibly mapped onto a Dense Wave Division Multiplexer (DWDM) The network carrier will use whatever services and bandwidth is available at the connection points