infrastructure

VoIP (Voice over IP)
PBX systems
Web technology
WAN
MPLS
ATM
XDSL
Ethernet switched services
Internet servcies
Satellite systems
Mobile solutions
GSM
GPRS
UMTS
HSDPA
LAN
Passive components
Active components
Rack design
International standards
E.g.: IEC, ISO, CENELEC
Data centre security
UPS
Climate control
Access control
Fire protection
Public networks
Analogue
ISDN
IP/ SIP
Client / Server technology