This Recommendation defines the physical, electrical and logical specification of a digital parallel interface which is to be used to interconnect the different devices needed in standardisation activities of speech codecs sponsored by the ITU‑T.
Included in this Recommendation are the data formats at the input and output of the encoder, decoder and bit manipulation devices.
Finally, rules for the implementation of codecs to guarantee proper interoperation of devices interconnected using that digital parallel interface are presented.