1. An interface device for coupling electrical signals by acoustical means--usually into and out of a telephone instrument.
2. A terminal device used to link data terminals and radio sets with the telephone network.
Note: The link is achieved through acoustic (sound) signals rather than through direct electrical connection.
Source: from Federal Standard 1037C and from MIL-STD-188
... YPP[?] YPQ[?] YPR[?] YPS[?] YPT[?] YPU[?] YPV[?] YPW[?] YPX[?] YPY[?] YPZ[?]
YQA[?] YQB[?] YQC[?] YQD[?] YQE[?] YQF[?] YQG[?] YQH[?] YQI[?] YQJ[?] YQK[?] YQL[?] YQM[?] ...
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