Innovation in rtv networks: use of optical fiber

This innovation is an adaptation of standards to technology, it consists in using a technology different from the one prescribed in the current regulations for the realization of the installation of RTV (radio and television service).

Background Information / Main Objective

This innovation is an adaptation of standards to technology, it consists in using a technology different from the one prescribed in the current regulations (regulation of common telecommunications infrastructures, ICT) for the realization of the installation of RTV (radio and television service).

The distribution network of the Torrecárdenas Shopping Center was initially designed based on a network using coaxial cabling, our proposal consists in implementing a hybrid fiber-coaxial architecture, which interconnects the header, located on the first floor with the different commercial premises and rooms. Before starting to execute the communication facilities of the TORRECÁREDENAS COMMERCIAL CENTER in Almería, we analyzed the inconveniences of the use of coaxial cable (the one prescribed in the current regulations, ICT and in the project of facilities that FASA had contracted) in the execution of the installation of RTV, due to the great distances that the wiring of the RTV network had to travel, from the head equipment to each commercial premises.

These distances were going to cause very high attenuations in the distribution cables. The drawbacks caused by the morphology of the building when using conventional technologies were multiple, the high attenuations in the distribution cables caused by long distances, the use of coaxial cables with very low losses (which are expensive and difficult to install), the greater space needed in the pipes, the large number of necessary amplifiers, the complexity of the assembly of these materials, low signal quality, etc.

The optimal solution for quality, speed and ease of assembly and economy to run the RTV network was to use fiber optics. The change consists of collecting the electrical signals that are taken from the headend and convert them into optical signals to be transmitted by fiber optic through the different branches, at the end of each branch (node), these optical signals are converted back into electrical signals from Radio Frequency, from these ends of branch is already made a distribution by coaxial cable to each of the premises. Through the transmission of RTV signal by optical fiber we guarantee to have a signal of sufficient quality in each one of the nodes, which will allow us to distribute from these nodes to each location through a coaxial network guaranteeing the necessary signal levels in each one of them.

The problem is that fiber optic is not a material or technology collected by the ICT to perform the installation of RTV. For this reason, we protected ourselves in a paragraph of the Telecommunications Law that mentioned the use of other technologies (The regulation regulating the common infrastructures of electronic communications will promote the sustainability of the buildings and real estate complexes, of residential, industrial, tertiary and dotational use, facilitating the introduction of those information and communication technologies that favor their energy efficiency, accessibility and security, tending towards the progressive implementation in Spain of the concept of digital home “) we proposed to the COIT (college of telecommunications engineers) the possibility of using a “New technology”, in this case fiber optic, for the realization of the RTV installation. With the affirmative answer FASA (legal report attached) he took charge of the drafting and legalization of the new ICT project, with the novelty of the use of optical fiber in the RTV network. Currently the project is already legalized and the installation in service (attached legalized mall project and test protocols where the correct operation of the installation is guaranteed).

The network finally executed is a broadband communications network in order to offer a wide range of multimedia services, including all kinds of video, voice and data signals. The design of the network is open, flexible and transparent to the type of signals. The criteria on which the network design is based are the following:

  • Transparency.
  • Standardization: teams meet and even improve, national and international standards and regulations.
  • Capacity: the selected equipment guarantees the maximum capacity for insertion of services, both current and future.
  • Migration capacity.
  • Reliability: The high reliability and availability of the service is ensured with the required degree of redundancy in equipment, fibers and routes to the nodes final. The generation of broadcasting services for TV signals is mainly done at the head office, where TV signals are received and processed, coming from different sources (terrestrial and satellite transmissions). Depending on the direction of transmission, we can speak of the descending path, which carries the signal to the endpoints (user). In the downward direction, the headend sends the television signal to the optical receivers by means of the optical transmitters, in these transmitters the electric signal is transformed into an optical signal and through the Fiber network it is transported to the optical receivers. In each optical receiver the optical signal is transformed into electrical, in a bandwidth of 45 – 862 MHz and 950 – 2150 MHz suitable for the cable distribution network. This signal is already sent through the coaxial network to the different user points (premises and final outlets). All equipment and solutions meet the following conditions: • High level of reliability and service availability.
  • Complete analog and digital systems integration.
  • Flexibility to migrate in future future changes such as a 2nd Digital Dividend to fully digital systems, as well as the adoption of new services or expansion of those planned.
  • Efficient use of space resources, heat dissipation, and power supply with detailed plans of the expected rack occupation, spatial location by rack.
  • Solutions and interfaces according to the standards. The distribution network in the header contains the mix of all channels tuned and modulated in COFDM.

To transport and distribute the signals from the antenna header to the different areas of the shopping center, it has been planned to do so by means of optical links. In the main header, the conversion of the signals from electrical to optical will be carried out and these will be sent, through 2 single-mode fibers, to each of the areas where the two optical receivers are. The Optical Transmission modules have 2 inputs, 1 TV input (45 – 862) MHz and 1 FI-SAT input (950 – 2,150). 1 Optical output 1310 nm. They also have fiber optic connection type monomodo, optical output connector SC / APC 8º. The distribution of the signal is based on DFB (Distributed Feedback) ultra-linear laser of 4 mW (6 dBm), with automatic power control (APC). Fully compatible with PAL, SECAM, NTSC, FM, DVB-S / S2, DVB-T / T2, DVB-H, DVB-C and others. Separate TV and FI channels with high gain of RF amplification. Independent settings of OMI (Optical Modulation Index) for TV and FI. The optical distributors (FSP), Its assembly in support-Rack of head Class A. They distribute the output power of the FTD emitters towards several optical nodes that are located in the last floors of the Mall, simplifying the equipment of the optical distribution (Distributors). optical outputs 3 for application with single-mode fibers, wavelength 1310 nm and 1550 nm, distribution attenuation 5.5 dB, input and output connectors, type SC / APC 8th).

THIS TELECOMMUNICATIONS PROJECT WILL BE CERTIFIED BY FASA AS PROJECT R + D, we are currently collaborating with the company PROINTEM (R + D + i consultants) to carry out this certification.

This innovation is REPLICABLE in all ICT facilities in which the distances of the RTV network are important (centers and commercial parks, office complexes, sports complexes, golf courses, etc.).

Goals

As part of the general endowments of the Torrecárdenas Shopping Center in Almería, there is the need to implement an RTV distribution network that will send the TV signal (Terrestrial and Satellite), FM Radio and Digital Radio (DAB) in general all the Radio Frequency (RF) signals available to the premises and common areas defined by the owners of the center.

Initially the planned network was based on a traditional distribution of signals through coaxial cabling and distribution elements (secondary amplifiers, diverters and distributors), this network was designed following the methodology and standards that have been used for years.

At the time of beginning with the implementation of this distribution network, it was detected that due to the great distances existing between the amplification equipment and some of the commercial premises, the signal distribution had to cross a large number of elements (diversifiers, distributors and amplifiers) and therefore the signal would be degraded successively, resulting in a signal that in some cases would not have sufficient quality or signal level to meet the minimum levels required.

To solve this problem, it was thought to perform a distribution network of the signals through elements and equipment based on fiber optic cabling.

The proposed network is a broadband communications network in order to offer a wide range of multimedia services, including all types of video, voice and data signals. The design of the network is open, flexible and transparent to the type of signals.

The objectives on which the network design is based are the following:

  • Transparency.
  • Standardization: teams must comply with and even improve, whenever possible, national and international standards and regulations.
  • Capacity: the selected equipment will guarantee the maximum capacity for insertion of services, both current and future.
  • Migration capacity.
  • Reliability: The high reliability and availability of the service will be ensured with the required degree of redundancy in equipment, fibers and routes to the nodes final.

These objectives are REPLICABLE in all the buildings that fulfill the ICT the RTV networks have to travel long distances (shopping and leisure centers, sports complexes, offices, etc.