To be able to carry out optimal and efficient planning of the different signal-treatment systems, we designed an integration network of systems in accordance with the following criteria:

- Overall service profile
- Safety and reliability. The data-transport network is designed to cover different errors through the use of alternative routes, double systems or by guaranteeing electricity supply through the UPS.
- Physical wideband coverage The network coverage uses fibre optics, and is further complemented with copper and coaxial pairs.
- The networks are expandable, both in terms of speed as well as services.

The electricity supply to trains, the operation of the water-extraction pumps, the escalators, the video-surveillance systems and the on-board safety systems are also controlled centrally.

Another group of communication needs refers to the customer-service and information systems, through electronic information panels that provide useful information to the user. This group also includes the intercom system, by which Metro passengers can communicate with the heads of each station or with the Control Room.

The section that deals with internal corporate communications features a radio communications system

With regard to buses, the radio telephone equipment is an indispensable element that supports the SAE and regulates the movement of vehicles along the different stops.

A final transmission group includes the telephone communication systems that allow interconnections between the different work centres.