Condition - Very Good The item shows wear from consistent use, but it remains in good condition and functions properly. Item may arrive with damaged packaging or be repackaged. It may be marked, have identifying markings on it, or have minor cosmetic damage. It may also be missing some parts/accessories or bundled items.
SONET/SDH Demystified
Increasingly, the use of fiber optic cable as a transport for voice, data, video, and Internet traffic is becoming the norm. Sonet (Synchronous Optical Network) and Sdh (Synchronous Digital Hierarchy) are being used with high-speed data transmission. Although Sonet/Sdh was originally intended for use in broadband Isdn and support leased line services like Ds-1 and Ds-3. Sonet/Sdh expansion is being fuelled by many of today's biggest industries such as Boeing, Disney and At&T as these companies move their internal global networks to a Sonet/Sdh infrastructure. This work provides coverage of Sonet/Sdh technology written at a level that will be understandable to technicians working in the telecommunications industry. It includes detailed examples of Dwdm (dense wavelength division multiplexing) and Wdm (wavelength division multiplexing).
