초록 ▼

An interface device for use between a North American PCM channel bank and a CCITT PCM channel bank which allows data to stay in digital format rather than being converted to voice frequency. The interface takes care of not only the completely different serial data rates, but the different transfer c

An interface device for use between a North American PCM channel bank and a CCITT PCM channel bank which allows data to stay in digital format rather than being converted to voice frequency. The interface takes care of not only the completely different serial data rates, but the different transfer characteristics of the channel data words. Synchronization is obtained by dividing the serial data stream into enough channel banks so that there is less than one-half cycle time period difference between the frequency of the incoming and outgoing data streams for one cycle of channel data words.

대표청구항 ▼

Apparatus for interfacing data channel banks of two different configurations directly without converting to voice frequency comprising, in combination: first means for supplying and receiving serial information bits at a first clock rate C1 for a plurality of channels N, where the serial bits includ

Apparatus for interfacing data channel banks of two different configurations directly without converting to voice frequency comprising, in combination: first means for supplying and receiving serial information bits at a first clock rate C1 for a plurality of channels N, where the serial bits include both data words for each channel embedded with signalling information and a single bit of frame alignment information for each frame of information; second means for supplying and receiving serial information bits at a second clock rate C2 for a plurality of channels N+M+S where the serial bits of channels M and N include only data and the serial bits of channels S include only signalling information; and interface means, connecting said first means to said second means, said interface means including means for passing only N channels of data in both directions between said first and said second means in real time whereby the serial bit streams are divided into enough parallel data buses that shifting of common reference points on the digital data bits being transmitted does not exceed ½cycle of a data bus clocking rate before commencing a new frame of channel information.