the lot, and a traffic light will inform the driver when the lot is available. Tallinn University of Technology March 2013 MODES In its initial state, the system is functioning in Automatic mode. By turning switch 3 on the main controller, Manual mode will be enabled on both of the crossroads. At this point, each of the crosswalks can actually be toggled between Democratic mode and Main Street mode. AUTOMATIC MODE Automatic is the default mode. In this mode, the sensors are not active, and the lights switch automatically back and forth after fixed periods of time. In this release, the time periods are equal, but it is possible to give lower-priority roads a smaller time window. This mode is suited to be used in busy hours of the day.
Hosts can use other network-layer protocols besides IP. IP and other data-link layer protocols (e.g., Novell IPX or AppleTalk) each have there own, standardized type number. Furthermore, the ARP protocol has its own type number. Cyclic Redundancy Check (CRC) (4 bytes): The purpose of the CRC field is to allow the receiving adapter to detect whether any errors have been introduced into the frame, i.e., if bits in the frame have been toggled. Preamble: (8 bytes) The Ethernet frame begins with an eight-byte preamble field. Each of the first seven bytes of the preamble is 10101010; the last byte is 10101011. The first seven bytes of the preamble serve to "wake up" the receiving adapters and to synchronize their clocks to that of the sender's clock. The last two bits of the eighth byte of the preamble (the first two consecutive 1s) alert adapter B that the "important stuff" is about to come.
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