- Dongwon System Corp.
- SDH-MUX,ADSL,SMX-16,ITGS.
- Address:621-3,Bakdal-dong ,Manan-gu, Anyang-si
- Fine Digital Inc.
- VSWRMS,Digital Repeaters,Packet Mux,NMS,RF Monitor,Packet Mux,RMS.
- Address:7F., Fine Venture Bldg., 345-1, Yatap-dong, Bundang-gu, Seongnam-si
- Photonics Planar Intearation Technology Inc
- Beam Splitter,AWG DWDM Mux/Demux.
- Address:958-10,Daechon-dong ,Buk-gu
- Doah Elecom
- PCM (ISDN T/E for P32-T),PCM (P32-T/DDP (Dual Data Port)),Smallest & Kightest Digital Camera,Analog WESS ,Power Failure Detector ,Digital WESS ,PCM (P32-T-M (MC-MUX)),Softel DA-6000 ,Softel DAP 3000 ,P32-T/DP,P32-T.
- Address:277-40,Seongsu 2-ga 3-dong ,Seongdong-gu
- Enidus
- CDMA Repeater,Wire (HDSL),Wire (P32-T),Wire (Nx64),Wire (Micro-Mux),SDH-MUX,Wireless (Hand Free Kit),Wireless (Micro Wave Equipment),TRS Repeater,Wire (DSU),The Micro-MuxD.
- Address:195-58,Anyang 7-dong ,Manan-gu, Anyang-si
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