What is the purpose of the preamble in an Ethernet frame?
Synchronization, Frame delineation
The preamble in an Ethernet frame serves two main purposes:
1. Synchronization: The preamble is used to synchronize the clocks of the transmitting and receiving devices. It consists of a pattern of alternating ones and zeros, which allows the receiver to identify the start of a new frame and align its clock with the sender’s clock. This synchronization ensures that the receiver can correctly interpret the incoming data.
2. Frame delineation: The preamble also helps in delineating the boundaries of the Ethernet frame. It serves as a signal to the receiving device that a new frame is about to begin and allows it to accurately detect and extract the subsequent frame’s data.
By including a unique pattern in the preamble, the receiver can differentiate between frames and avoid misinterpretation of data.
In summary, the preamble in an Ethernet frame is essential for synchronization between devices and for accurate frame delineation, enabling reliable communication over the Ethernet network.
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