Upgrading strategies for B-ISDN subscriber loops

An Optimal Investment Strategy of Optical Transceivers for Static WDM Networks

“…In addition, considering that ET is proportional to the operating period, cash flow in the operating period does not have an influence on the fact that Sc.2-XFP is superior to Sc.2-TL in terms of network costs. Moreover, even if the price reduction effect due to the learning curve [5,6] makes a ratio of the prices of Remote IF module (i.e. TL, XFP) to that of packages smaller by the future market expansion of XFP and TL, the comparison of the superiority between Pat.1 and Pat.5 in Figure 4 implies that Sc.2-XFP will be superior to Sc.2-TL in terms of network costs.…”

“…The price of FWL for Local IF approximates that of XFP for Local IF. Moreover, lower XFP prices are expected due to the effect of mass manufacturing/procurement [5,6], considering the future expansion of the XFP market. The number of backup parts becomes large if FWL, which is fixed on package, is adopted.…”

Cable Installation Topologies for Upgradable Broadband Local Loops

“…Upgrading strategies for broadband local loops have been investigated in a previous paper [1]. Details of cable installation were not explained in this paper, since instal lation costs have little influence on the selection of strate gies.…”

Broadband Local Network Evolution to All-Optical Implementation

“…Optimization of upgrading strategies was also studied and it has been shown that upgrading in the order of, (1) fiber to the curb (FITC), (2) hybrid FITC and FITH, and (3) pure FITH, is one of the optimum solutions [5].…”

“…Only down-stream sys tems are shown here for simplicity. Up-stream systems are supposed to have much smaller capacities [5]. Note that three types of optical fibers are defined in the figure.…”