| No | Word | Definition |
| 1 | Data Terminal Equipment | A device, e.g. a computer, that generate data to be communicated to some destination. |
| 2 | Circuit-Terminating Equipment (DCE) | An interfacing device between a DTE and a transmission medium or a network. |
| 3 | The EIA-232 (RS-232) Standard) | A standard that specifies the relation between the DTE and the DCE, published by the Electronic Industry Association (EIA). |
| 4 | Null Modem | An RS-232 connection setup that allows two DTEs to communicate directly bypassing the DCEs (modems). |