One older interface standard is called x21 how does it


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?

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Computer Engineering: One older interface standard is called x21 how does it
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