Line switching apparatus and method
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United States of America Patent
Stats
-
Feb 5, 1991
Grant Date -
N/A
app pub date -
May 12, 1989
filing date -
May 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A line switching apparatus includes receiving circuitry for receiving a line-connection request signal from an extension, discriminating circuitry for determining whether a connection is possible to the line when the connection request signal is received from the receiving circuitry, sending circuitry for sending a busy signal to the extension when the discriminating circuitry determines that connection to the line is impossible, detecting circuitry for monitoring the status of the line during sending of the busy signal by the sending circuitry, and detecting that the line is in a connectable state, and alarm circuitry for informing the extension of the fact that the line has been detected to be in the connectable state by the detecting circuitry.
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