What signals in addition to T C R and I are used

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Reference no: EM131828683

Problem

1. One older interface standard is called X.21. How does it compare to USB? What signals in addition to T, C, R, and I are used in the X.21 interface standard?

2. The asynchronous protocol, as it first appeared, described an option for 1, 1.5, or 2 stop bits. Why would anyone need or want to use 1.5 or 2 stop bits?

Reference no: EM131828683

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