| Pulse code modulation (PCM) of voice frequencies | |
 | |
| Status | In force |
|---|---|
| Year started | 1988 |
| Latest version | (04/16) April 2016 |
| Organization | ITU-T |
| Related standards | G.191, G.711, G.729 |
| Domain | audio compression |
| Website | https://www.itu.int/rec/T-REC-G.703 |
G.703 is a ITU-T standard originally written in 1972[1] but subsequently revised a number of times since. It defines a physical and electrical interface used for encoding voice or data over 75 ohm co-axial cable terminated in BNC or Type 43 connectors or 120 ohm twisted pair cables terminated in RJ48C jacks. The choice is carrier- and region-dependent.[2]
G.703 defines digital carriers of various speeds such as T1 and E1. These are organised as part of a hierarchy of carriers defined in G.702.
A G.703 E1 link is typically, though not necessarily, framed using the G.704 standard which divides the data stream into time slots. Typically, each time slots represents an E0 (64kbit/s) voice channel encoded using pulse-code modulation (PCM). The PCM coding is defined in the G.711 standard. G.704 also includes a control timeslot slot and a signalling timeslot (CAS or CCS).