The transmission network implementation in Colombia, is a technological activity where telecommunication providers face new growing quests. In 2009, access to internet showed an increase of 26% to a total subscriber 2’746 .816 of which 77% is dedicated access subscribers, distributed by technologies as follows: 64.07% belongs to xDSL connections, 2.11% to WiMAX and Wireless connections, and 32.3% to Cable Technologies, counting with high demands for voice and data solutions. It is projected that by 2012, these services and its growth impose a traffic increasing of 46%. Therefore, telecommunications operators will be forced to increase the capacity of their transport networks, especially in areas in which these networks operate with PDH technology (Plesiocronous Digital Hierarchy), because it is not possible to respond to traffic generated by subscribers. This article compares the transmission technologies, Metro Ethernet, DWDM (Dense Wavelength Division Multiplex) and SDH (Synchronous Digital Hierarchy), considering: medium access method, transmission speed, wavelength used, bandwidth, capacity and connectivity to the backbone, concluded that, because SDH is fully adapted to PDH, is the most versatile transmission technology for the design and implementation of optical transmission ring in selected links in Bogota and because of the universality of the proposed implementation methodology, elsewhere in the immediate future.