| 1 | ADJ | Adjacent DPC link set |
| 2 | ADL | Asynchronous Data link |
| 3 | ADM | Add-Drop Multiplexer |
| 4 | ADSL | Asynchronous Digital Subscriber Line |
| 5 | AMA | Automatic Message Account |
| 6 | AMD | Advanced Micro Devices |
| 7 | ANSI | American National Standards of Institue |
| 8 | ATDM | Asynchronous Time Division Multiplexer |
| 9 | ATM | Asynchronous Transfer Mode |
| 10 | BHCA | Busy Hour Call Attemp |
| 11 | B-ISDN | Broadband ISDN |
| 12 | CAMA | Centralized Automatic Message Account |
| 13 | CAS | Channel Associated Signalling |
| 14 | CCS | Common Channel Signalling |
| 15 | CCS7 | Common Channel SignallingNo=7 |
| 16 | CMI | Code Mark Invention |
| 17 | COFI | Codec Filter |
| 18 | CP | Call Processing |
| 19 | CSMA | Carrier Sense Multiple Access |
| 20 | DAA | Data Access Arrangement |
| 21 | DCME | Digital Circuit Multiplex Equipment |
| 22 | DDF | Digital Distribution Frame |
| 23 | DECT | Digital European Cordless Telecommunication |
| 24 | DPC | Destination Code Point |
| 25 | DSSI | Digital Subscriber Signalling System 1 |
| 26 | DTMF | Dial Tone Multi Frequency |
| 27 | DWDM | Dense Wavelength Division Multiplexer |
| 28 | ETSI | European Telecommunications Standarts Institue |
| 29 | FTTC | Fiber To The Curb/Curve |