US 5,513,256 AGranted

Key telephone system

AssigneeKabushiki Kaisha Toshiba

InventorIsaku Komuro

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Abstract

A telephone system provided with a key service unit having ports to which terminal telephone sets are connected. The unit has a first memory having memory areas each for storing at least one customer data for each port; a second memory for storing the data temporarily; and a control section for transferring the data between the memory areas through the second memory. The data to be transferred is first transferred from the first memory to the second memory temporarily; secondly data stored in a transfer destination memory area of the first memory (for a port to which a terminal set is newly connected) is transferred to a transfer start memory area of the first memory at which the data to be transferred is originally stored (for a port to which the same terminal set is so far connected); and finally the data already transferred to the second memory is transferred to the transfer destination memory area (as a new port data of the newly reconnected terminal set).

Claims10

Dependent claims

A telephone system including a key service unit having a plurality of ports coupled to a plurality of telephone sets, respectively, the key service unit, comprising:

first memory means having a plurality of memory areas, each memory area for storing data for a respective one of the plurality of ports, the data being for controlling the operation of a telephone set connected to the corresponding port;
second memory means for storing the data temporarily;
means for recognizing a certain signal transmitted by one of the telephone sets;
and
control means, responsive to the recognizing means, for transferring data to the memory area corresponding to the port connected to the one of the telephone sets, from the memory area corresponding to another port through said second memory means, the control means including means for transferring data from said first memory means to said second memory means, in response to a start-signal transmitted by a telephone set, subsequently transferring data stored in a transfer destination memory area of said first memory means to a transfer start memory area of said first memory means, in response to an end signal transmitted by the telephone set, and transferring the data already transferred to said second memory means to the transfer destination memory area of said first memory means.

2 more elements

Dependencies are inferred from the claim text.