The IT-CS group is responsible for all communication services in use at the laboratory.This includes networks and communication for data, voice and video. In order to support the different services, the group operates a large campus IP/Ethernet network installation, which reaches out to almost every building on the CERN sites. The campus network is connected to the Internet, and it also interconnects with high capacity links to collaborating institutes.

The group is also operating the fixed-wire telephone system, the GSM mobile phone system and the radio system for the emergency services. In addition, the group operates a few legacy on-site video and voice distribution systems for dedicated services.

At this time, the group strives to reduce the diversity of the installation and bring the wired services on to the ubiquitous IP/Ethernet platform.

The aim is to optimize the availability and capacity of the communication systems with consideration of costs.