Automatic signalling-system switching device for digital line circuit device in subscriber system
AssigneeFujitsu Limited
InventorKazuo Tanaka
Life of this patent
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Abstract
In an automatic signaling-system switching device provided in a subscriber line circuit between a communications device and an exchange, the subscriber line circuit has a plurality of signaling-system processing units respectively providing processes suitable for a plurality of signaling systems usable in the subscriber line circuit. A first unit is provided for identifying one of the plurality of signaling systems on the basis of a state of the subscriber line circuit. The signaling systems have respective particular states of the subscriber line circuit. A second unit is provided, which selects one of the plurality of signaling system processing units corresponding to the one of the plurality of signaling systems identified by the first unit.
Claims17
An automatic signaling-system switching device provided in a subscriber line circuit connected between a communications device and an exchange, the subscriber line circuit including a plurality of signaling-system processing units, each signaling-system processing unit corresponding to and configured for processing signals of a respective one of a plurality of signaling systems usable in the subscriber line circuit, said automatic signaling-system switching device comprising:
- identifying means for identifying which one of the plurality of signaling systems is to be used in the subscriber line circuit on the basis of a state of the subscriber line circuit, and issuing signaling-system setting signals on the basis of said state, the signaling systems having respective particular states of the subscriber line circuit;
- and
- selecting means, coupled to said identifying means, for receiving said signaling-system setting signals and selecting from the plurality of signaling-system processing units a signaling-system processing unit corresponding to the signaling system identified by said identifying means.
A digital line circuit device between a communications device and an exchange, said digital line circuit device comprising:
- a plurality of signaling-system processing units respectively providing processes suitable for a plurality of signaling systems usable in a subscriber line circuit;
- and
- an automatic signaling-system switching device including:
- identifying means for identifying which one of the plurality of signaling systems is to be used in the subscriber line circuit on the basis of a state of the subscriber line circuit, the signaling systems respectively having particular states of different types of subscriber line circuits, said identifying means issuing signaling-system setting signals on the basis of said state;
- and
- selecting means, coupled to said identifying means, for receiving said signaling-system setting signals and selecting from the plurality of signaling-system processing units a signaling-system processing unit corresponding to the signaling system identified by said identifying means.
A digital line circuit device comprising:
- a central office terminal connected to an exchange via a subscriber line;
- a remote terminal connected to a communication device;
- and
- a transmission line connecting the central office terminal and the remote terminal to each other,
- wherein said central office terminal comprises:
- a plurality of signaling-system processing units respectively providing processes suitable for a plurality of signaling systems usable in a subscriber line circuit;
- and
- an automatic signaling-system switching device including:
- identifying means for identifying which one of the plurality of signaling systems is to be used in the subscriber line circuit on the basis of a state of the subscriber line circuit, the signaling systems respectively having particular states of different types of subscriber line circuits, said identifying means issuing signaling-system setting signals on the basis of said state;
- and
- selecting means, coupled to said identifying means, for receiving said signaling-system setting signals and selecting from the plurality of signaling-system processing units a signaling system processing unit corresponding to the signaling system identified by said first identifying means.
A digital line circuit device comprising:
- a central office terminal connected to an exchange via a subscriber line;
- a remote terminal connected to a communication device;
- and
- a transmission line connecting the central office terminal and the remote terminal to each other,
- wherein said central office terminal comprises:
- a plurality of first signaling-system processing units respectively providing processes suitable for a plurality of signaling systems usable in the subscriber line circuit;
- and
- an automatic signaling-system switching device including:
- first means for identifying one of the plurality of signaling systems on the basis of a state of the subscriber line circuit, the signaling systems respectively having particular states of different types of subscriber line circuits;
- and
- second means, coupled to said first means, for selecting one of the plurality of signaling-system processing units corresponding to said one of the plurality of signaling systems identified by said first means,
- wherein said remote terminal comprises:
- a plurality of second signaling-system processing units respectively providing processes suitable for the plurality of signaling systems usable in the subscriber line circuit;
- and
- third means for selecting one of the plurality of signaling-system processing units in the remote terminal so that the remote terminal and the central office terminal use an identical process suitable for the subscriber line circuit.
Dependencies are inferred from the claim text.