ST. LOUIS, MO.- Manufacturer Belden has announced plans to cut 20% of its work force.Approximately 1,800 staff will let go as the company streamlines its manufacturing, sales and administrative functions worldwide. The company manufactures and sells high-speed electronic cables, connectivity products and related items for the specialty electronics and data networking markets."As we reported in October, we have seen softening of our major markets globally, and we expect that economic conditions will remain challenging for some time. Therefore it is necessary for us to further adjust our cost structure so that we can continue to be competitive under such conditions....