Example #5 - Two-Wire Interface (separate network hardware). Example 5 is conceptually similar to example 4. The difference here is that separate networks are created by providing each local area network (LAN) with its own network switch. Therefore, traffic segmentation is physical rather than logical. Example 5 also provides an additional level of fault tolerance, although at the expense of additional network hardware. The figure shows a separate network switch for QSControl.net traffic and a separate network switch for CobraNet audio traffic. All of the previous comments regarding network expansion still apply.