CMI-encoder

Details CMI-encoder CMI-encoder

1978-02-03

1980-02-19

Griffin, Robert L.

Telegraphy

Systems

Alternating or pulsating current

178 68, 360 40, H03K 1324

Patent

active

041896211

ABSTRACT:
An encoding circuit provides an improved interface code of the CMI (Code Mark Inversion) type for transferring binary information between different points within terminal stations for digital communication, such as telephone exchange stations. Encoded output signals, in the CMI format or code, are produced with respect to a clock related signal in a manner such that each positive or negative transition of the encoded output signals occur at the end or at the beginning of a data bit period of the output signals, irrespective of whether the binary value of the input signals to be encoded is 0 or 1. Signal trailing edges, which are to be used for clock recovery by a subsequent decoder, are triggered by clock pulses, and are not derived from different signal channels of the encoding circuitry which, typically, would have made the relative phasing of the signals in the channels critical.

REFERENCES:
patent: 3953673 (1974-04-01), Dorward
"Some Techniques PCM" Bull. SEV. Bd. 51 (1960), Nr.20, Oct. 8, 1960, Neu.
"Clarification of Definition of CMI Interface at 140 MBIT/S", C.C.I.T.T. study GP 18, Jul. 1977.
"An Equipment Interface Code for Operating Rates Above 100 MBIT/S", C.C.I.T.T. study GP D-#14, Feb. 1974.
"A New Class of Selected Ternary Pulse Transmission Plans for Digital Transmission Lines", Sipress, IEEE Trans. Com., vol. 13, No. 3, Sep. 1965, pp. 366-372.

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