This paper reports the results of the study on the subscriber signaling system in the data switching network. Requirements for the subscriber line signaling and, the advantages in realizing the requirements with three level sighaling system are discussed. In this system, signals are defined by three logical states of the subscriber line, i.e. +, -'and N. This system is applicable to both start-stop and synchronous terminals. A DTE-DCE interface suitable for the system is also described.
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