Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1996-12-27
2001-07-17
Marcelo, Melvin (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C379S093120, C705S037000
Reexamination Certificate
active
06263000
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to trading call systems used for financial transactions at financial institutions such as banks and securities firms, and more particularly is related to remote control trading call terminals of a trading call system comprising trading call terminals installed at homes of individual traders in an environment similar to the one of a trading room to enable trading transactions at homes by installing a trading call terminal.
BACKGROUND OF THE INVENTION
Conventional trading call systems are built by accommodating multiple trading call terminals in a line control unit via an ISDN basic interface (2B+D) circuit. Each trading call terminal in the system transmits and receives environmental information, such as which line received a message or which line is being used by another trading call terminal and under what circumstance, using a D channel of the ISDN basic interface. The status can be monitored by the indication on the line display lamp of a trading call terminal. Based on these functions, actions can be taken, such as making a judgement as to whether to accept or reject a receiving call knowing the receiving line (the calling party) or avoiding a call being made to a line being used.
In the meantime, a trading call terminal is required to acquire multiple lines simultaneously and to communicate to each of them, and further, to transmit and receive environmental information therefor to and from the line control equipment. When a trading call terminal is connected to the line control unit via a commercial switched circuit, environmental information cannot be transmitted or received, as the voice information alone occupies multiple lines, and therefore, the use of a trading call terminal under the same environment as the trading room was difficult.
Furthermore, even in the case of using an ISDN circuit as the commercial switched circuit, environmental information cannot be transmitted as is, as the voice information occupies two B channels and call control data occupies the D channel.
On the other hand, as trading transactions deal with both the domestic market and the overseas market, the trader has to stand by in the trading room to adjust to the customer's local time if he is dealing with a customer in a country having a different time zone. In order to cope with such situation, the demand is growing for an environment where a call can be made similarly as in the trading room by installing a trading call terminal at home.
SUMMARY OF THE INVENTION
This invention is intended to enable trading transactions to be done at home through the same operation as in a trading call terminal in a trading room by connecting a trading call terminal installed at home to a line control unit, and providing the same environment as the trading call terminal installed in the trading room.
In order to realize such environment, this invention enables transmitting and receiving of environmental information to and from the trading call terminals installed remotely from the trading room by providing a means to relay environmental information of the trading call system to the trading call terminals connected to a remote terminal adapter via a commercial switched circuit in a trading call system. The invention includes a line control unit having a multiple switched circuit trunk connected to a switched circuit and multiple line circuits, trading call terminals connected to the aforementioned line circuits, remote terminal adapters connected to the aforementioned line circuits, and trading call terminals connected to the said remote terminal adapters via a commercial switched circuit.
Furthermore, under this invention, an ISDN circuit is used as the commercial switched circuit for connection between the remote terminal adapter connected to the line control unit and the trading call terminal, and between the line control unit and the trading call terminals connected to the remote terminal adapters via the commercial switched circuit, two channels of voice information compressed to 32 Kbps are transmitted through one of the two B channels of the ISDN basic interface, and environmental information is transmitted as 64 Kbps control information through the other B channel.
Furthermore, remote terminal adapters are provided on both sides, the line control unit side and the side of the trading call terminals connected via the commercial switched circuit, and the functions of compressing and expanding voice and of extracting and matching channels are provided to each remote terminal adapter.
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Antonelli Terry Stout & Kraus LLP
Hitachi Telecom Technologies, LTD
Kwoh Jasper
Marcelo Melvin
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