 imagine that not all devices will transmit at the same rate of speed or have the same amount of two-way interactive traffic. Therefore, the statmux function of the PAD interleaves the packets based on an algorithm that enables each device to appear as though a dedicated link is available to it. The use of a statmux is beneficial because it enables users to employ the expensive leased link to the maximum benefit of the organization. This requires fewer physical links and takes advantage of the dead time between transmissions and SO on. Figure 7-8 shows a series of sessions running on a single link, all inter- leaved. This also shows that packets are not specifically interleaved in the order of A, B, C, and SO on. Instead, they can be interleaved on the basis of the flow or delivery method used, such as A, B, A, B, C, B, A, and SO on. Herein lies the added benefit of packet switching-the user achieves the data throughput necessary without having a dedicated resource that is only periodically used. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. X.25, Internets, Intranets, and Extranets X.25, Internets, Intranets, and Extranets User A User C Figure 7-8 Multiple users sharing the same links. Modem 00000000 00000000 Modem User D Modem 00000000 ID/BI User B Modem @@@@@@@@ Advantages of Packet Switching Packet switching is considered by many to be the most efficient means of sharing both public and private network facilities among multiple users. Each packet contains all of the necessary control and routing information to deliver the packet across the network. Packets can be routed independently or as a series that must be maintained and preserved as an entity. The major advantages of using this type of transport system are Shared access among multiple users, either in a single company or in multiple organizations. Full error control and flow cont