established in 2002, beijing human information technology co., ltd is a professional manufacturer of telecom and security products,certified by iso 9001:2008. we independently r&d e1/v.35/ethernet protocol converters, e1/v.35/ethernet fiber modems, 1~16e1 pdh multiplexers,baluns, pcm multiplexers, media converters and video multiplexers. with powerful advantages in data communication, optical communication and integrated circuit design, our products are widely used in telecommunication, mobile communication, electric power, unicom, monitoring etc. excellent products, advanced technology, constant innovation, competitive prices and professional service help us win good reputation at home and abroad. at present, there are more than 1000 cooperative customers and some of them are well-known enterprises in the same line. looking forward to cooperate with you in near future.