apply to long distance optical communication,optical testing system,LAN and WAN,CATV system,digital communication system Product FeaturesInsertion ... Applications:1. Long Distance Optical Communication2. Optical Testing System3. LAN and MAN4. CATV system5. Digital Communication SystemSpecifications:ItemText ConditionTest ValueOpticalInsertion ... +65 ,93%R.H, For 100h<0.2dB Patch Code cable (FC,SC,ST)