SDH добавлено пользователем evilman_work. permanent link
http://direct.www.tek.com/Measurement/App_Notes/sdhprimer/2RX_11694_2.pdf || http://paginas.fe.up.pt/~mleitao/STEL/Tecnico/SDH_JDSU.pdf
CalcScript v. 1.1
Author: mdma special for #linux channel on RusNet. 2011