HTD 1000M Single and Multi-Mode Converter is a kind of modulated fiber-optical single and multi-mode converter and mainly conducts the transparent conversion between the media of single and multi-mode optical fiber. It may switch over among 850nm, 1310nm multi-mode fiber (550m) and 1310nm, 1550nm single mode fiber (100km) and support 100m quick Ethernet. It is widely used in the interlinking and data communication fields of LAN and WAN and the single unit may be used for the single and multi-mode conversion.