White Papers & Articles
Our White Papers are meant to inform you about a technological topic and philosophy related to RF transmission from dish to rack and back. Articles and Case Studies describe applications of our products or discuss current technical topics in satellite, broadcasting and cable network areas.
Etisalat, one of the largest telecommunications companies in the world and the leading operator in the Middle East and Africa, wished to expand an existing CATV head-end in UAE by adding a 700-channel IPTV system. The order to supply the system went to the Chinese telecommunications group Huawei. For the critical system segment from the antenna to the receiver, Huawei relies on products and services of DEV Systemtechnik.
One of the biggest telecom service provider in Vietnam, who had plan to build up a Cable TV network nationwide, including a main head-end in Hanoi plus over 700 Sub head-ends along the country. The Hanoi head-end receives signal from satellite antenna dishes with dual-Pol and IP contribution, and at each Sub head-end delivers both digital and analogue cable TV signal over GPON network.
“RF over Fiber” refers to technology that modulates light with a radio frequency signal for transmission over an optical fiber. All satellite ground stations and teleports must have an effective transmission method for RF signals linking antennas, signal management equipment and wide-ranging equipment centers. Beyond traditional copper or coax, current “state-of-the-art” installations are best served by fiber-optic links.
State-of-the art satellite communication systems at the highest data rates are operated on the Ka-Band. As transmission quality on Ka-Band frequencies is heavily dependent on weather conditions, suitable system configurations need to be carefully planned and chosen. Ka-Band Site Diversity configurations relying on DWDM RF-over-Fiber transmission systems and redundancy switching units represent best-suited solutions and ensure maximum system reliability and system availability.
The customer is looking for a RF signal management solution for a new IPTV head-end. In order to reach maximum availability the IPTV head-end will receive the satellite signals via two Diversity Antenna Sites (~80km distance between the sites). The RF signal management solution needs to ensure reliable transmission, selection, switching and distribution of the antenna signals.
As BCE moves about 20 Antennas to its Junglinster site in Luxembourg, it embarks on a journey to expand, modernize and enhance its services for its customers. This case study looks at the outdoor-indoor fiber-connection of the successively growing antenna park at Junglinster.
CCTV (China Central Television) is the biggest and most important news media in China. There are 19 antennas, which are used to receive and transmit TV signals, located in 3 positions in the TV station. The distance between any two positions is more than 500meters, so they need transmit L-band signal via optical fiber.
This case study provides an overview of how a large satellite and data communications service provider implemented a cost effective, location diverse antenna installation for Ka-Band satellite data transmissions.
High uptime is critical for most satellite ground station signals. Failure of a single device in the transmission chain can disrupt large arrays of service. This creates the need for a smart, automated, backup protection system. To meet application-specific requirements for satellite earth stations and L-band distribution systems, redundancy switches offer important advantages for operators. A single motorized antenna can serve an entire dish farm as a backup antenna protecting multiple primary dishes. Signal monitoring, control and switching of a backup antenna can be offloaded to a redundancy switch to secure a cost-effective, simple-to-use solution offering a highly robust redundancy system.
The power level of a system or a signal chain is one of the main indicators to guarantee a reliably signal integrity with a sufficient signal-to noise-ratio. In a signal chain each device is dependent that the previous one delivers the proper signal level. If the level is too high nonlinear performance will occur or in the worst case equipment will be damaged. Is the level to low, the carrier signal can be lost in the noise.