what is the maximum length for a fiber optic cable?
The minimum length for the optical fiber on a cable is: L(min) = A(min) / a= 6.5dB/ 0.22dB/km = 29.5km. The maximum length for the optical fiber on a cable is: L(max) = A(max) / a = 21.5dB/ 0.22dB/km = 97.72km. where, a = attenuation for the optical cable (dB/km). On the basis of this calculation, the maximum hop distance for the OC48 LR 1550 card is between 29.5km and 97.72km. With this procedure as a basis, you can now calculate all others spans.