Please note that JavaScript and style sheet are used in this website,
Due to unadaptability of the style sheet with the browser used in your computer, pages may not look as original.
Even in such a case, however, the contents can be used safely.

  1. Home
  2. Press Releases
  3. NEC deploys 176km microwave link between the islands of Sao Tome and Principe

NEC deploys 176km microwave link between the islands of Sao Tome and Principe Longest microwave link ever deployed by NEC over the sea

*** For immediate use July 20, 2015

Lisbon, Portugal and Tokyo, Japan, 20 July 2015 - NEC Portugal, a subsidiary of NEC Corporation, has installed a microwave radio link between the islands of Sao Tome and Principe, providing twenty 2Mbps channels for GSM mobile communications and a minimum of 300Mbps for IP data communications using the 4GHz band with a modulation of 64QAM. This project was awarded by CST (Companhia Santomense de Telecomunicacoes).

The connection covers 176km, making it the longest 4GHz microwave radio link ever deployed by NEC over the sea with IP technology. Previously, the island of Principe was supported by TDM technology delivering just 2Mbps channels. The new solution implemented by NEC uses Adaptive Modulation Radio (AMR) technology, which enables stable transmission even under rough weather conditions, enabling it to achieve a maximum capacity of 560Mbps under favorable climatic conditions. This almost doubles the bandwidth available for data communications when compared to the original project specification, which intended to achieve at least 300Mbps bandwidth available with the 64QAM modulation.

NEC has 20 years of experience in designing, planning and implementing microwave projects in Portugal, and Portuguese-speaking countries such as Timor and now Sao Tome and Principe. The company implemented the solution in just five weeks using its long-haul microwave radio system, the NEC DMR 5000iPS.

"The capacity increase in the link between the two islands is an ambitious achievement that has brought the island of Principe closer to the island of Sao Tome. It has vastly increased the quality of telecommunications services in the island of Principe," said Walker Viana, CST's Technical Director.

"The design, planning and implementation of a link with these characteristics, over the sea and for a record distance, is always a challenge, given the need to ensure the high levels of performance and quality by which NEC is recognized in the market. However, taking advantage of the technological advances of its equipment and the experience of its engineers gathered over two decades of activity, NEC met this challenge and successfully established this high capacity link between the two islands," said Joao Paulo Fernandes, General Manager, Sales and Marketing, NEC Portugal.

NEC was selected due to the quality of its equipment and the link design it prepared, together with its experience in the management and execution of microwave radio transmission projects. This resulted in a truly competitive solution, capable of ensuring the high performance level required by CST.

A youthful African nation which this year celebrates its 40th anniversary, Sao Tome and Principe consists of two islands of volcanic origin and a number of smaller islets. It is a key producer of cocoa with a growing tourism industry. Commercial oil production is expected to begin within a few years. Better mobile voice and data coverage will play a key role in supporting growth in these and other sectors.


About NEC Corporation
NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. By providing a combination of products and solutions that cross utilize the company's experience and global resources, NEC's advanced technologies meet the complex and ever-changing needs of its customers. NEC brings more than 100 years of expertise in technological innovation to empower people, businesses and society.  For more information, visit NEC at

Based on its Mid-term Management Plan 2015, the NEC Group globally provides "Solutions for Society" that promote the safety, security, efficiency and equality of society. Under the company's corporate message of "Orchestrating a brighter world," NEC aims to help solve a wide range of challenging issues and to create new social value for the changing world of tomorrow. For more information, please visit

Orchestrating a brighter world

NEC is a registered trademark of NEC Corporation. All Rights Reserved. Other product or service marks mentioned herein are the trademarks of their respective owners. (C)2015 NEC Corporation.