| German | English |
| A-B-C-Remailing | A-B-C remail |
| C2 | Development Division |
| C3 | Production Division |
| C1 | Marketing Payment Services Division |
| c-Ader | sleeve wire (S wire) |
| c-Ader | private wire |
| c-Ader | test wire |
| c-Ader | local wire |
| c-Ader | c wire |
| c-Ader | P-wire |
| c-Ader | S-wire |
| C-Band | C band (3.9-6.2 GHz, sat) |
| c-Band Frequenz | C-band frequency |
| C-Ebene | C-plane |
| C-Ebene-Stapel | C-plane stack |
| C-Kanal | C-channel (control channel; ISDN) |
| C-Netz | C-Net |
| C-Netz | C network (analog cellular RT network corresponding to GB 'Cellnet', 450 MHz, from 1986, being replaced by 'C-Tel', q.v.; s.a. 'D-Netz') |
| C-Netz-Telekom | mobile network C ('C-Netz' upgrade, otherwise identical, privacy protection by signalling measures and voice encryption, 1995) |
| C/R | C/R |
| C/R | command/response field bit |
| CE-Zeichen | EC conformity mark |
| CE-Zeichen | EC mark of conformity |
| CE-Zeichen | CE mark of conformity |
| CS-Signal | composite source signal (voiced-sound "artificial voice", measurement signal, pause - Annex B, ETS 10-07, dig. tel. testing) |
| Feature-Group-C | feature group C |
| Inmarsat-C-Dienst | Inmarsat-C service |
| Koppelvielfachreihen C-Steuerteile | switching matrix row C control units |
| Lackrot C | lake red c |
| Natel C | national in-car telephone system (Nationales Autotelefon-System n C, Swiss, 900 MHz) |
| RS232C | RS232 interface with 5V voltage source drive |
| Schallpegel-Bewertungsskala C | C-message weighting |
| Schnurschaltung mit Zeichengabe über c-Ader | sleeve-control cord circuit |
| Sprachspeichersystem des C-Netzes | voice messaging system of the mobile network C |
| Teilnehmer-CE | communication entities |
| tragbarer Loran-C | transloc |
| Vermittlungsschrank mit Zeichengabe über c-Ader | sleeve-control switchboard |
| Zweitor in C-Schaltung | C network |
