## Appendix D
\"One plus one\" protection implies such an approach that the same traffic is sent via the primary and secondary (protection) path, and a higher quality, i.e., a better sample of the traffic signal is taken at the output. This practically means that parallel traffic takes place and that in case of failure of one of the transmission paths, the traffic proceeds smoothly via the other transmission path. So, the \"50 ms\" condition is met. One-to-one protection of the primary transmission path implies that the protection path has the same capacity as the primary transmission path, and in the event of a failure of the primary transmission path, the backup transmission path (connection) takes over all traffic. Here it is necessary to monitor whether the \"50 ms\" condition is met. While the primary transmission path is in operation, other lower priority traffic can be sent over the protective transmission path (traffic that sends data that is not sensitive to transmission delay), so that the transmission path is not unused and in case of failure of the primary path, this traffic is suspended and all traffic from the primary transmission route is taken over. This item is described by the following equation:  
\[QoPr=\left(\frac{NoULA_{4}\text{:}F_{ULA4}}{MaxLI_{4}}+\frac{NoULA_{3}\text {:}F_{ULA3}}{MaxLI_{3}}+\frac{NoULA_{2}\text{:}F_{ULA2}}{MaxLI_{2}}+\frac{ NoULA_{1}\text{:}F_{ULA1}}{MaxLI_{1}}+\frac{NoULA_{A}\text{:}F_{ULA}}{MaxLI_{A}} \right)\text{.}0.1\]  
where:  
* NoUA\({}_{\text{x}}\) = The number of populated places of the UAx category that are connected by fiber-optic infrastructure to the telecommunications system of the observed telecom operator (x = A, 1, 2, 3 and 4) and according to them there is protection of the primary path \"1 + 1\" or \"1 to 1\" and with the system reaction condition of a maximum of 50 ms,MaxUAx = Total number of inhabited places from categories UAx in that country (x = A, 1, 2, 3 and 4), Fx = Factors that indicate the importance of a particular category of populated places in that country (x = A, 1, 2, 3 and 4). The sum of these factors is one (1). Factors F are calculated in the same way as in item six. So, they are calculated according to the size of the settlement (number of inhabitants), their economic importance, tourist potential, which means according to the potential that operator has in that area, considering the previously mentioned factors. Factors F are calculated according to the following equation:  
\[F_{x}=\left(\frac{NoInh_{ULAx}\cdot F_{Inhx}}{NoInh_{State}}+\frac{GDP_{ULAx} \cdot F_{GDP}}{GDP_{State}}+\frac{NoNTN_{ULAx}\cdot F_{Roam}}{NoNTN_{State}}\right)\]  
where:  
* NoInhUAx--The total sum of the population in each UAx (x = 1, 2, 3, 4 and A)
* NoInhState--The total population of the country,
* FInhx--Factor that describes the value of individual UAx for the potential of the telecommunications market (x 0 1, 2, 3, 4 and A),
* GDPUAA--The sum of gross social product that is made in UAx environments,
* GDPState--Gross domestic product in the country,
* FGDP--A factor that describes the importance (income) of business users in the telecommunications market of that country,
* NoNTNUA--Number of nights of foreign guests/tourists in UAx settlements (x = 1, 2, 3, 4 and A),
* NoNTNState--The total number of nights spent by foreign guests/tourists in the country,
* FRoam--The importance of roaming, that is, the income generated by foreign users in the country,
* FInh + FBDP + FRoam = 1. The items that have been described and defined by mathematical equations in a unique way give the value of the quality and potential that the observed telecom operator has and shows the current situation, but also provides guidelines for the development of the telecom and thus for increasing its business potential. The maximum value of this field is one. It should be noted that over time certain items will be changed or supplemented, and some will disappear, and others will take their place. All this depends on the development of the telecommunications market.