| ICS | Field |
|---|---|
| 33.040.01 | Telecommunication systems in general |
| 33.040.20 |
Transmission systems Including synchronization, cable systems, integrated cabling, pathways and multiplexing |
| 33.040.30 |
Switching and signalling systems Including telecommunication call charging and billing aspects |
| 33.040.35 |
Telephone networks Including Public Switched Telephone Networks (PSTN), Private Telecommunication Networks (PTN) and Private Integrated Service Networks (PISN) |
| 33.040.40 |
Data communication networks Including Packet Switched Public Data Networks (PSPDN) and Ethernet ISDN, see 33.080 OSI local, wide and metropolitan area networks, see 35.110 Modems, see 35.180 |
| 33.040.50 |
Lines, connections and circuits Including access networks and network elements |
| 33.040.60 |
Powerline telecommunications Power transmission and distribution, see 29.240.01 |
| 33.040.99 | Other equipment for telecommunication systems |