ZyXEL Communications MSC1000G User Manual page 43

Figure 1 MTU Application
• The IES provides DSL service over telephone wires to subscribers in a Central Office (CO)
application. The following figure shows the IES-5000 set up in a telephone company's central
office.
Figure 2 Central Office Application
Management Switch Card User's Guide
Chapter 1 Getting to Know Your MSC
43