Method used to calculate the RGU position

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The installation point of the buried RGU on the fiber span leading to the receive-end station must be carefully calculated. The designed distance of the fiber span from the RGU to the receive-end station, and the designed loss of this post-RGU fiber span must be determined based on the system configurations and the total line loss (deriving from factors such as the span length and fiber loss factor).

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Method used to calculate RAID capacity
If the number of RAID member disks is N (excluding hot spare disks), available capacity of RAID 0 = N x disk capacity. Available capacity of RAID 1 = N x Disk capacity/Number of mirror groups Available capacity of RAID 3 = (N-1) x Disk capacity Available capacity of RAID 5 = (N-1) x Disk capacity Available capacity of RAID 6 = (N-2) x Disk capacity Available capacity of RAID 10 = N x Disk capacity/Number of mirror groups Available capacity of RAID 50 = (N-2) x Disk capacity

Method used to calculate fiber loss
In general, the fiber loss budget for the 1310 nm wavelength is 0.45 dB/km and that for the 1550 nm wavelength is 0.275 dB/km.

Method used to calculate a linked clone VM's storage resources
The storage resources required by a linked clone VM are calculated as follows: Formula: ROUNDUP (N/128, 0) x Size of the base volume + N x Average size of delta volumes. The average size of delta volumes needs to be calculated based on the site situation. Generally, the estimated average size is 5 GB.

Relationship between the gain and noise figure of an EDFA
The noise figure (NF) of an EDFA can be calculated according to the following formula: NF = Pase/(H*V*Δv;V*G) NF: noise figure Pase: noise per 0.1 nm H: Planck constant [6.6260755 ± 0.0000040) x 10-34J-s] V: signal frequency Δv: 12.5 GHz (0.1 nm) G: OA gain Obtain the logarithm: Pase = NF + G �?58 According to the preceding information, a larger OA gain results in a larger NF.

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