At one of the expression in telecommunication network, abstraction doing topology and channel etc., connection thing of the network group where it is displayed that it is possible......
*Network externally
At the time of product servicing which has the quality of network, the number of users and frequency etc. of utilization thing of the character which produces effect on use and the utilization value which can by the utilization of that product......
*NPV (net present value)
Future cash inflow (cash influx) from present worth, cash outflow which is investment (cash drain) the net amount which deducts present worth.
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