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AssigneeKabushiki Kaisha Toshiba
InventorsHiroshi Mano, Hideyasu Mori, Yuichi Yamazaki, Norimitsu Ikehata, Takashi Aoki, Yoshikazu Sano
Estimating the term…
In a key telephone system in which a plurality of data terminals 37l . . . 37n such as personal computers are connected to a key service unit 1 connected to a plurality of ISDNs 23l . . . 23m, a terminal adapter (TA) 41 is pooled so as to be usable in common for the plural data terminals 37l . . . 37n. In response to a setup signal from an ISDN (e.g. 23l), the key service unit 1 selects a single data terminal designated by a subaddress included in the setup signal from among the data terminals 37l . . . 37n, and closes a communication channel between the selected data terminal (e.g. 37l) and the TA 41, so that a status equivalent to that where the selected data terminal 37l and the TA 41 are directly connected to each other can be established. Thereafter, the key service unit 1 transmits a setup signal to the TA 41, and the TA 41 transmits a call to the selected data terminal 37l. When the selected data terminal 37l responds to the call from this TA 41, the key service unit 1 closes a communication channel between the TA 41 and the ISDN 25l, so that a communication link between the selected data terminal 37l and the ISDN 23l can be established via the TA 41. During the process until this communication link can be established, since the selected data terminal 37l and the TA 41 are in the status equivalent to direct coupling, the key service unit 1 is not concerned in the communications between the selected data terminal 37l and thus TA 41, thus reducing the operational load applied to the key service unit 1.
A terminal adapter pooling system in which a terminal adapter is pooled to enable communications between an integrated services digital network, ISDN, and a plurality of data terminals respectively, comprising:
A central unit for a terminal adapter pooling system in which a terminal adapter is pooled to enable communications between an integrated services digital network, ISDN, and a plurality of data terminals, respectively via the central unit connected to the ISDN, comprising:
A method of establishing communications links between an integrated services digital network, ISDN, and a plurality of data terminals, respectively via a terminal adapter, in a terminal adapter pooling system in which the terminal adapter is pooled to enable the respective communications between the ISDN and the plural data terminals, the method comprising the steps of:
Dependencies are inferred from the claim text.