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The OFF condition indicates that the DTE should turn OFF Circuit DPR and set the states of the
Digit Signal Circuits for the next digit. Circuit PND shall not be changed to the ON condition while
Circuit DPR is ON.
Circuit PND may come ON after the DTE turns Circuit DPR OFF following the presentation of the
last code combination on NB1, NB2, NB4, and NB8.
Circuit DPR - Digit Present (CCITT 211)
Direction: TO 7500
Signals on this circuit are generated by the DTE to indicate that the 7500 may read the code
combination presented on Circuits NB1, NB2, NB4, and NB8.
The OFF to ON transition indicates that the DTE has set the states of Circuits NB1, NB2, NB4, and
NB8 for the next digit.
CHAPTER 9: TECHNICAL INFORMATION
143
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