Abstract:
A trading communication system. A line control unit includes a channel switch circuit, a number of line trunks connected to the channel switch circuit and adapted to be connected to a line network, and a number of line circuits connected to the channel switch circuit. A number of first terminal adaptors are connected to the line circuits. Some of the first terminal adaptors are adapted to be connected to a commercial switched circuit, while one of the first trading call terminals is connected to one of the first terminal adapters. A number of second trading call terminals are at locations remote from the line control unit. A number of second terminal adaptors are connected to the second trading call terminals and are adapted to be connected to the commercial switched circuit to connect the channel switch circuit to the second trading call terminals. The line control unit transfers environmental information about the trading communication system through the first terminal adapters, the commercial switched circuit, and the second terminal adapters to the second trading call terminals.

Description:
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&#39;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. 
    
    
     BRIEF EXPLANATION OF THE DRAWINGS 
     FIG. 1 is a system block diagram of an embodied system based on the invention. 
     FIGS. 2A and 2B are, respectively, a front view and a side view of the call terminal of the embodied system. 
     FIG. 3 depicts the transmission line from the call terminal line circuit to the trading call terminal in the embodied system. 
     FIG. 4 depicts the data format on the transmission line in the embodied system. 
    
    
     DETAILED DESCRIPTION 
     A trading call system for a remote control method for trading call terminals under this invention is explained by using FIG. 1 which is a conceptual drawing showing the system configuration. 
     The remote control method for trading call terminals of a trading call system under this invention comprises a line control unit  14 , accommodating multiple call terminals (trading call terminals)  11 , which is connected to either the public line network or the private line network. 
     Furthermore, the trading call system under this invention comprises a remote call terminal  25  made by connecting a desired call terminal  11   a , to a remote terminal adapter (RTA)  12   a , via an ISDN (ISDN circuit of ISDN basic interface (hereinafter called“ISDN circuit”) and an RTA  12   b , and a call terminal office data management unit (SAT)  23  connected via a terminal adapter (TA)  24 . Trading call terminal (DB)  11  is connected to channel switch (TSW)  15  via call terminal digital line circuit (IBDLIN)  13  using an S point interface of an I interface of the line control unit (LCU)  14 . Furthermore, trading call terminal  11   a , which functions as the remotely located remote call terminal  25 , and call terminal digital line circuit  13  are connected by the ISDN circuit, which is a commercial switched circuit, and remote terminal adapters (RTA)  12   a  and  12   b . 
     Each trading call terminal  11 ,  11   a  is provided with a call terminal office data memory (MEMB)  26  where call office data, such as registration of function keys of each call terminal and registration of the other party corresponding to the line, is stored. 
     The line control unit  14  comprises a call terminal digital line circuit  13 , channel switches (TSW)  15 , main wire trunks (COT)  16  connected to a public line network, private line trunks (PVT)  17  connected to private line network, a signal receiving and distribution unit (SRD)  18 , a central processing equipment (CPE)  19 , a line control unit office data memory (MEMA)  20 , a floppy disk drive (FDD)  21 , and a personal computer interface (PC I/F)  22 . 
     Channel switch  15  is connected to the public switched circuit network via switched circuit trunks  16  and to the private line network via main wire trunks  17 . 
     Central processing equipment  19  controls call connection via a CC bus and controls other operations of the total switching equipment. 
     Line control unit office data memory  20  stores a control program and office data. 
     Personal computer interface  22  and terminal adapter  24  interface the connection between channel switch  15  of line control unit  14  and call terminal office data management unit  23  which manages the data of trading call terminal  11 . 
     Remote terminal adapters  12   a  and  12   b  connect channel switch  15  and trading call terminal  11   a  of remote call terminal  25  via an ISDN circuit which is a public line network. 
     Moreover, remote terminal adapters  12  are provided with a voice compression and expansion function, and voice information is compressed or expanded between 64 Kbps and 32 Kbps. Therefore, voice information of two channels can be transmitted by using only one of the two B channels of the ISDN circuit. 
     Furthermore, remote terminal adapters  12   a  and  12   b  are provided with the function of transmitting and receiving environmental information of the trading call system accommodated by the line control unit through one of the two B channels of the ISDN circuit. 
     In a trading call system configured as described above, between remote terminal adapters  12   a  and  12   b , which are located between line control unit  14  and trading call terminal  11   a  which is remotely located, voice information for two channels is transmitted and received by one of the two ISDN B channels and environmental information is transmitted and received by the other B channel. 
     As described above, this invention enables the use of trading call terminals installed at homes under the same environment as the terminals installed in the trading room by connecting the line control unit of the trading system installed in the trading room and the trading call terminal installed at home via an ISDN circuit, and thus a trading call system which enables trading transactions at home can be provided. 
     FIGS. 2A and 2B depict the external shape of the trading call terminal. On the outside wall of the cabinet  55  in FIG. 2A, function keys for left hand set  42 , function keys for right hand set  43 , volume for left hand set  44 , volume for right hand set  45 , volume for receiving sound  46 , programmable function keys  47 , line keys  48 , numeric keys  49 , LCD for dial monitor display  50 , the other party name display devices  51  and  52 , modular jack for left hand set connection  53 , modular jack for right hand set connection  54 , and hand set hangers  56  are provided. 
     Based on the trading call terminal data stored in the call terminal office data memory  26 , trading call terminal  11  registers auto dial and the other party&#39;s name to the line key  48 , and displays the other party&#39;s name corresponding to the line key on the display devices  51  and  52 . By pressing the line key  48  corresponding to the other party as displayed on the display devices  51  and  52 , an outgoing call or incoming call response can be made in a one touch process. 
     Line key  48  can display whether any call terminal is in use or receiving status by means of a lighting or flickering lamp or color change based on the control data from the line control unit  14 . Therefore, the operator can take various actions such as acquisition of an open line, responding to a received call, monitoring or participating in lines in use. 
     The trading call terminal data stored in call terminal office data memory  26  is registered by the trading call terminal data management unit  23  as shown in FIG. 1, sent out to call terminal line circuit  13  via terminal adapter  24 , personal computer interface  22  and channel switch  15 , then stored in the call terminal office data memory  26  via remote terminal adapter  12 . 
     FIG. 3 describes the transmission line from the line control unit  14  to the trading call terminal  11   a , and detailed construction of remote terminal adapter  12   a ,  12   b  is depicted, while transmission line  32 , from the channel switch  15  to the remote terminal adapter  12   a  on the line control unit side via call terminal line circuit  13 , transmission line  33 , from the remote terminal adapter  12 a on the line control unit side to the remote terminal adapter  12   b  on the trading call terminal  11   a  side, and transmission line  34 , from the remote terminal adapter  12   b  on the trading call terminal  11   a  side to the trading call terminal  11   a , are depicted. 
     FIG. 4 depicts the data format on each of the above transmission lines for the cases of voice information transmission and data transmission. 
     Remote terminal adapter  12  comprises a compression and expansion section  27 , control unit (CONT)  28 , selector switch (SW)  29 , channel extraction and matching section  30 , channel extraction and matching section  31 , and network control unit (NCU)  41 . 
     First, two channels of 64 Kbps voice information (B 1  (A), B 2  (A)), connected to the call terminal line circuit  13  by channel switch  15 , and control information D (A), including environmental information from the central processing equipment  19 , are interfaced with the remote terminal adapter  12   a  in data format A 1  as shown in FIG. 4 (A) on the transmission line  32 , enabling transmission of two channels of voice information and call control to the trading call terminal. 
     Furthermore, when transmitting office data (64 Kbps, B 2  (B)) from the trading call terminal data management unit  23  to the trading call terminal  11   a , data transmission of 64 Kbps is made possible by employing the data format A 2  as described in FIG. 4 (A) after informing the trading call terminal  11   a  that data transmission will be made by means of a call control information D (A). 
     Next, when interfacing with trading call terminal  11   a  of the remote call terminal  25 , the data on transmission line  32  in data format A 1  as described in FIG. 4 (A) is separated into two channels of 64 Kbps voice information B 1  (A), B 2  (A) and 16 Kbps environmental information D (A) at each channel extraction and matching section  31  provided at the remote terminal adapter  12 , and each of the 64 Kbps voice information B 1  (A), B 2  (A) is compressed to 32 Kbps voice information B 1  (A′), B 2  (A′) at the compression and expansion section  27 . Then the two calls of 32 Kbps voice information BI (A′), B 2  (A′) and 16 Kbps environmental information D (A) are fed into the channel extraction and matching section  30  through the B 1  channel and B 2  channel, respectively, where the data is converted to data format B 1  as depicted in FIG. 4 (B), and sent out to transmission line  33 . Here, D is a 16 Kbps call control information of ISDN  35  created at network control unit (NCU)  41  and transmitted over D channel of 16 Kbps. 
     At remote trading call terminal  25 , division is made into two calls of 32 Kbps voice information B 1  (A′) and B 2  (A′) transmitted over B 1  channel, 16 Kbps environmental information D (A) transmitted over B 2  channel and 16 Kbps call control information D of ISDN  35  transmitted through 16 Kbps D channel of transmission line  33  at the channel extraction and matching section of remote terminal adapter  12   b , and two channels of 32 Kbps voice information B 1  (A′) and B 2  (A′) are expanded to two channels of 64 Kbps voice information B 1  (A) and B 2  (A) at compression and expansion section  27 , and each call is distributed to the B 1  channel and B 2  channel, then fed into channel extraction and matching section  31 . 16 Kbps call control information D (A) is fed into channel extraction and matching section  31  as is through the D channel. The signal to transmission line  34  is decoded back to the same data format as the one on transmission line  32  in data format Cl as depicted in FIG. 4 (C) so that trading call terminal  11   a  can accept it. 
     When transmitting call terminal office data from trading call terminal data management unit  23  to trading call terminal  11   a  via remote terminal adapter  12 , 64 Kbps office data B 2  (B) is transmitted through B 2  channel and call control information D (A) is transmitted through D channel, and they are sent out to remote terminal adapter  12   a  in data format A 2  as depicted in FIG. 4 (A). Advance notice to the effect that it is a data transmission is given to control section  28  of the remote terminal adapter  12   a  by means of call control information, and by switching of selector switch  29  at the remote terminal adapter  12   a , compression and expansion section  27  is bypassed and B 2  of channel extraction and matching section  31  and B 1  of channel extraction and matching section  30  are connected, resulting in the office data B 2  (B) being transmitted through the B 1  channel and the call control data D (A) being transmitted through B 2  channel, and sent to remote call terminal  25  via transmission line  33  in data format B 2  as depicted in FIG. 4 (B). Here, D is 16 Kbps control information of the INS 64  network created at NCU 41  and transmitted through 16 Kbps D channel. 
     At remote terminal adapter  12   b  of the remote call terminal  25 , switching of selector switch  29  is made to connect BI of the channel extraction and matching section  30  and B 2  of the channel extraction and matching section  31  so that the office data B 2  (B) transmitted through B 1  channel on transmission line  33  is relayed to B 2  channel, and the call control information D (A) transmitted through B 2  channel on transmission line  33  is relayed to D channel by bypassing the compression and expansion section  27 , and further is sent to the trading call terminal  11   a  via transmission line  34  in data format C 2  as depicted in FIG. 4 (C). 
     On transmission line  34 , 64 Kbps data transmission is made possible by employing the data format C 2 . When ending the data transmission, the end of data transmission is indicated to the control section  28  (CONT) by means of call control information, selector switch (SW)  29  is switched to connect to the compression and expansion section  27 , and the data transmission is ended. 
     As explained above, trading transactions at home are made possible based on an environment the same as that of a trading room provided at home by installing a trading call terminal which is in the same operational environment as the trading call terminal installed in the trading room.