![]() ![]() A 6-byte source address, which is set to the sender's.Mode), or the set of all recipient nodes ( broadcast Mode), a group of recipient nodes ( multicast ![]() A 6-byte destination address, which specifies either a single.Header MAC encapsulation of a packet of data When encoded using Manchester encoding, at 10 Mbps, the 62 alternating bits produce a 10 MHz square wave (one complete cycle each bit period). Strictly speaking the last byte which finished with the '11' is known as the "Start of Frame Delimiter". This consists of 62 alternating 1's and 0's followed by the pattern 11. A node starts transmission by sending an 8 byte (64 bit) preamble sequence. The purpose of the idle time before transmission starts is to allow a small time interval for the receiver electronics in each of the nodes to settle after completion of the previous frame. The entire frame is preceded by a small idle period (the minimum inter-frame gap, 9.6 or 10.4 microsecond (µS)) and a 8 byte preamble (including the start of frame delimiter). The MAC protocol encapsulates a SDU (payload data) by adding a 14 byte header (Protocol Control Information (PCI)) before the data and appending an integrity checksum, The checksum is a 4-byte (32-bit) Cyclic Redundancy Check (CRC) after the data. The Medium Access Control (MAC) protocol is used to provide Medium Access Control (MAC) Medium Access Control (MAC) ![]()
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