EPAD-400. SONET Optical MM Ethernet 10/100E Optical SM Optical CWDM 10 GbE Optical DWDM SONET Dense Wavelength Division Multiplexing (DWDM) Systems EPAD-500 Figure 5-37 EPAD-500. Ethernet 10/100E Optical CWDM 10 GbE SONET MAEPADs (Massively Arrayed EPADs) Figure 5-38 MAEPADs. Fiber Fiber Fiber Ethernet Fiber (SONET) SONET Chapter 5 Figure 5-39 Protocol model for price-optimized edge Null, IP devices. MACIN MACOUT PHYIN PHYOUT In each figure (5-33 to 5-38), a number of products are indicated, which are each targeted to a specific carrier application. The value proposition is to develop edge devices that meet a certain functional/price-point envelope, as shown by Figures 5-33 to 5-38. Note that the systems in Figure 5-33 have no Layer 2 or Layer 3 capa- bilities. The systems in Figure 5-34 have a Layer 2 capability over ATM, but no Layer 3 capability. The systems in Figure 5-35 have a Layer 2 capability over a WAN Ethernet (10 GbE WAN interface sublayer [WIS]), but no Layer 3 capability. The systems in Figure 5-36 have no Layer 2, but do have Layer 3 capability. Figure 5-37 systems have an ATM capability at Layer 2 and Layer 3 capability as well. The systems in Figure 5-38 have a WAN Ether- net (10 GbE WIS) capability at Layer 2 and also a Layer 3 capability. At the component level, there are really no shortcuts that lead to near- term cost reduction other than the component suppliers continuing to improve yields, increase volumes, and reduce manufacturing costs. 20 There are, however, specific component and module strategies coming out of the component community that address metro needs for reduced costs in spe- cific areas. You should focus less on cost reductions at the component level (via some upcoming technical breakthrough-however, see the following discussion) and more on getting the right-sized finished product in terms of Dense Wavelength Division Multiplexing (DWDM) Systems Figure 5-40 8 VoT1 on DSL Protocol combination space. SONET Optical SM 10/100E Optical MM Optical CWDM 10 GbE Optical DWDM Customer-