Electrical Equipment: Sfpd-03-1310-Wdm-Sc Module (Or Counterpart); Sfpd-03-1550-Wdm-Sc Module (Or Counterpart); Sfpd-20-1310-Wdm-Sc Module (Or Counterpart); Sfpd-20-1550-Wdm-Sc Module (Or Analogue)