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Telefonos de Mexico (TelMex) has embarked on a program to modernize its telecommunications network. At the heart of this modernization is a 13,500-kilometer optical fiber backbone that uses state-of-the-art technology. AT&T will provide about 60 percent of the required network for TelMex using dispersion-shifted fibers that operate at 1550 nanometers. The network will be installed to run at 565...