Computers as Components, 2nd Edition

428 CHAPTER 8 Networks

floors of the building, and the system must meet both hard (making sure the

elevator stops at the right point) and soft (responding to requests for elevators)

deadlines.

8.7.1 Theory of Operation and Requirements

We design a multiple elevator system to increase the challenge. The configuration

of a bank of elevators is shown in Figure 8.25.The elevator car is the unit that runs

up and down the hoistway (also known as the shaft) carrying passengers; we will

use N to represent the number of hoistways. Each car runs in a hoistway and can

stop at any of F floors. (For convenience we will number the floors 1 through F,

although some of