tal MRC/building (considers one end) $14,000 ($14,000 MRC per customer, but only $7,000 is generated at the building in question) Allocated ring cost per building/MRC (1 building equivalent $5,000 or use WDM) Allocated spur cost per building/MRC $1,500 Allocated CO equipment cost per building/MRC Allocated CPE cost per building/MRC Allocated riser costs per building/MRC Allocated network management costs per building/MRC Allocated SGA (= 18% of revenue) $2,520 Allocated operations costs (= 17% of revenue) $2,380 Total costs $13,924 Net profit Margin % Practical Design and Economic Parameters Figure 10-7 Two 10-Mbps Customers/Building Two 10-Mbps customers per $2,000 building. $1,500 $1,000 Figure 10-8 Four 10-Mbps Customers/Building Four 10-Mbps customers per $2,000 building. $1,500 $1,000 Figure 10-9 Two 100-Mbps Customers/Building Two 100-Mbps customers per $2,000 building. $1,500 $1,000 Chapter 10 Four 100-Mbps Customers/Building Figure 10-10 Four 100-Mbps customers per $3,000 $2,500 building. $2,000 $1,500 $1,000 One 1,000-Mbps Customers/Building Figure 10-11 One 1,000-Mbps customer per $3,000 $2,500 building. $2,000 $1,500 $1,000 Two 1,000-Mbps Customers/Building Figure 10-12 Two 1,000-Mbps customers per $6,000 $5,000 building. $4,000 $2.000 $3,000 Practical Design and Economic Parameters 10.4.3 Run 3: A Breakthrough Technology That Keeps CPE Costs Low While Supporting More Buildings on the Ring How important is a breakthrough that increases the number of buildings per backbone ring? Typically, you can support 8 to 16 buildings. The same assumptions are used as in the previous case except that the CPE costs have been cut in half. You can assess the impact by the following tables and figures. The bot- tom line is an improvement in the profitability of a few single-digit per- centage points except at the very high end, namely, if the market existed for a large number of full-throughput GbE services. In this last case, where the backbone cost dominated, the ability to carry twice as many customers improves prof