Suppose that a sender and receiver use asynchronous transmission and agree not to use stop elements. Could this work? If so, explain any necessary conditions.
Asynchronous transmission refers to the method of data transmission where the sender and receiver do not use a common clock signal to synchronize their communication. Instead, they rely on special control characters or bits to indicate the start and end of each data unit.
In the absence of stop elements, the sender and receiver can still make asynchronous transmission work, but some necessary conditions must be met:
1. Unique start and end characters: The sender needs to use unique start and end characters at the beginning and end of the data unit, respectively. These characters should not appear within the actual data being transmitted. These start and end characters help the receiver identify the boundaries of each data unit.
2. Escape mechanisms: If the data being transmitted includes the same start or end characters used for framing, a mechanism must be in place to escape or differentiate them. This can be achieved by introducing an escape character that is added before any occurrence of the start or end character within the data. The receiver then interprets this escape character in a way that distinguishes it from an actual frame boundary.
3. Error detection and correction: Asynchronous transmission lacks the built-in error checking mechanisms found in synchronous transmission, such as parity bits or cyclic redundancy check (CRC). Therefore, it is crucial to implement additional error detection and correction techniques, such as checksums or error-correcting codes, to ensure data integrity and reliability.
Overall, the successful operation of asynchronous transmission without stop elements requires the use of unique start and end characters, escape mechanisms to handle these characters within the data, and additional error detection and correction techniques to maintain data integrity.