Originally Posted by CLT Guy

(d) Each assignment under paragraph (b) of this section must provide for at least 10 consecutive hours of rest during the 24-hour period that precedes the planned completion time of the assignment.

"Precedes" means before. You must have 10 hours of rest BEFORE you begin your shift.

Rest means that you are free from all duty. This includes answering your phone. If you are required to answer your phone, you are not on rest.