| 摘要 |
Upgrading of a subscriber connection to another requires an upgrading work done by an electrician. According to the invention, the type of connection is upgraded by remote control. A switch matrix bus including several parallel lines (1-8) is placed in the access node. Connected fixedly in advance to the bus are interface units of an ADSL connection and, when desired, of an ISDN connection, however, in such a way that only one interface is connected actively to one bus line at a time. A controlled switch element (SE1, SE2) connects a line coming from a test relay (R3) located between the end of the subscriber line (e.g. SL3) and its interface to the switch matrix bus instead of the test bus. With a remote control signal supplied through network management a choice is made of which test relay connects the connected subscriber line to the controlled switch element. Since the line or wire couple of the switch matrix bus for its part is connected fixedly to the interface of the ISDN or ADSL subscriber connection, this means that the subscriber line can be connected by way of the switch matrix bus to the ISDN or ADSL interface instead of the original analog interface, or the subscriber line may be connected to the ADSL interface instead of the original ISDN interface. In this way, any subscriber line may be upgraded to a connection of another type by remote control.
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