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Pulse code modulation (PCM) of voice frequencies
StatusIn force
Year started1988
Latest version(04/16)
April 2016
Related standardsG.191, G.711, G.729
Domainaudio compression

G.703 is a 2016 ITU-T standard for encoding voice or data over digital carriers such as T1 and E1. G.703 provides specifications for pulse-code modulation (PCM).

G.703 also specifies E0 (64kbit/s). For information about E0 audio see G.711.

G.703 is either transported 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.[1]


  1. ^ "G.703: Physical/electrical characteristics of hierarchical digital interfaces". www.itu.int. Archived from the original on 2021-04-08. Retrieved 2021-04-08.

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