Year 2000. The problems that some legacy systems will have when the year 2000 comes. This is because some legacy systems are tied to the calendar and represent the year with two digits, eg July 4, 1998 is 07/04/98; so when the year 2000 hits, the calendar will be 01/01/00 and the system may interpret this as either the year 1900 or as an error.
yellow cable
See 10BASE-X and media.
Error control protocol for modems. A step up from x-modem.

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