Railways including Train Control

TOPEX CDF is an equipment designed to direct the joint traffic, providing to railway agents the means to achieve any type of operative, bilateral connection that the personnel requires. TOPEX CDF is a variant of digital switch that fulfills the requirements of dispatch centers with a small to average number of voice channels. The system features a modular structure, regarding the equipping of the central switch with interfaces as well as the operating positions (workstations). TOPEX CDF has been designed with a "star" form structure : the kernel, central switching equipment, is connected directly to each Dispatcher Console.


C21 Communications provides solutions and products designed to reduce the cost of telephony for SoHo and SME businesses, right through to global enterprises.

C21 Communications Ltd. Harwell International Business Centre, 173 Curie Avenue, Harwell, Didcot, Oxfordshire, OX11 0QG.


Contact Number: +44 1235 838592