Terminal adapter pooling system

Details Terminal adapter pooling system Terminal adapter pooling system

G - Physics

06

F

G06F 13/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2045019

In a key telephone system in which a plurality of data terminals 371 ... 37n such as personal computers are connected to a key service unit 1 connected to a plurality of ISDNs 231 ... 23m, a terminal adapter (TA) 41 is pooled so as to be usable in common for the plural data terminals 371 ... 37n. In response to a setup signal from an ISDN (e.g. 231), the key service unit 1 selects a single data terminal designated by a subaddress included in the setup signal from among the data terminals 371 ... 37n, and closes a communication channel between the selected data terminal (e.g. 371) and the TA 41, so that a status equivalent to that where the selected data terminal 371 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 371. When the selected data terminal 371 responds to the call from this TA 41, the key service unit 1 closes a communication channel between the TA 41 and the ISDN 251, so that a communication link between the selected data terminal 371 and the ISDN 231 can be established via the TA 41. During the process until this communication link can be established, since the selected data terminal 371 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 371 and thus TA 41, thus reducing the operational load applied to the key service unit 1.

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