Photo img7_007 Item information Caption: Cisco 15900 Wavelength Router, which uses DWDM (dense wave-division multiplexing). Thanks to Cisco Systems for making this photograph available, which is intended only for use in instructional materials based on "Computer Networks and Internets". Photo: img7_007 Type: photo Item: Photo img7_007 without textual material Keywords: photo img7_007, dwdm, optical routing Other sizes: Photo img7_007 at other sizes - 150x120, 600x477