Data communication system and apparatus

Details Data communication system and apparatus Data communication system and apparatus

1998-03-23

2004-05-04

Ton, Dang (Department: 2666)

Multiplex communications

Special services

Conferencing

C370S390000, C370S537000

Reexamination Certificate

active

06731610

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to data communication systems and apparatuses and, more particularly, to a data communication system and apparatus for performing sound and information data communication between a plurality of apparatuses (terminal equipment, line connection apparatuses).
As an example of a communication system of this kind, there is known an emergency report system for implementing 119/110 call reception from a subscriber, inter-console monitoring/interruption, fire station/police substation command origination, and radio communication with a dispatched automobile (ambulance, fire engine, police car and the like), 119 being a number dialed in Japan to call a fire station, and 110 being a number dialed to call a police station. Emergency 119/110 call reception from a subscriber, inter-console monitoring/interruption, fire station/police substation command origination, radio communication with a dispatched automobile are major facilities provided in a fire fighting center and police headquarters. In an emergency report system, plural apparatuses (public network switches, report reception consoles, command receiver apparatuses in a fire station/police substation, remote radio base station apparatuses) connect to each other via a switch (PBX) provided in a fire fighting center or the police headquarters and perform communication of sound and information data. Because such an emergency report system is socially important, the quality of high-speed (particularly, reduction of time required to transmit a command), reduction of system size, reduction of time required for delivery, and reduction in cost are demanded by customers, to say nothing of high-quality, high-reliability communication service.
2. Description of the Related Art
FIG. 1A
is a schematic diagram showing a construction of an emergency report system according to the related art. Referring to
FIG. 1A
, the emergency report system comprises a subscriber telephone (TEL)
1
, a public (NTT) network
100
, a line circuit (LC)
2
, a switch (NW)
70
of the NTT network, an emergency report trunk (FPT)
3
, a fire fighting center/the police headquarters
200
/
300
, a reception console
40
of emergency reports, a switch (NW)
20
of the fire fighting center/the police headquarters, an emergency report reception trunk (FPI)
23
, a command line trunk (LDS)
24
, a fire station/police substation
201
/
301
, and a command receiver apparatus
60
.
When a subscriber dials 119 using the TEL
1
, the call arrives at the switch
20
of the fire fighting center
200
via the switch
70
of the NTT network and the emergency report line, and is accepted by the report reception console
40
. The receiver of the report gives a command to a related (near the origination of the report) fire station
201
. The command is sent to the command receiver apparatus
60
of the related fire station
201
via the switch
20
and the command line. The command receiver who heard the command dispatches a vehicle (an ambulance, a fire engine or the like) according to the command, so that the subscriber can benefit from timely emergency service for an illness or disaster.
When a subscriber calls 110 using the TEL
1
, the call arrives at the switch
20
of the police headquarters
300
via the switch
70
of the NTT network and the emergency report line, and is accepted by the report reception console
40
. The receiver of the report gives a command to a related (near the origination of the report) police substation
301
. The command is sent to the command receiver apparatus
60
of the related police substation
301
via the switch
20
and the command line. The command receiver who heard the command dispatches a police car or a policeman to the spot according to the command, so that the subscriber can benefit from timely emergency service for a problem or accident. After the dispatch, communication between the vehicles and the reception console
40
is performed through a radio circuit (not shown).
FIG. 1B
is a perspective view showing the report reception console. Referring to a
FIG. 1B
, the report reception console has a line status display unit (LSDISP)
51
for performing realtime display of a line status (unused, call incoming, call proceeding, holdback etc.) of the emergency report line, the command line and the radio circuit; an operation unit
55
for displaying information indicating an emergency call incoming and for performing a call incoming reply operation (button operation); display lamps (LMP)
43
, and operation buttons (KEY). Some of the operation buttons
44
are arranged to form a pair with respective display lamps
43
so that a button operation corresponding to the lamp display can be performed quickly. The report reception console further comprises a headset or a handset (HS) used by a reception console manipulator for a call, and a monitor speaker (MSP) for monitoring a radio call sound as it arrives from a radio-equipped vehicle (fire engine, police car or the like).
FIG. 2
shows a signaling system of the emergency report line according to the related art.
Referring to columns of
FIG. 2
, DC indicates a DC line, and AC indicates an AC line (ringing tone at 16 Hz or the like). The line status of FPT
3
(unused, call originating, call proceeding, a re-ring signal, disconnection) is listed in horizontal columns. For example, in a state where the fire-fighting center DC line is “unused”, line A and line B of FPT
3
are connected to a zero potential (open), and line A of FPI
23
is connected to a zero potential (open) and line B thereof is connected to the ground via a constant resistance. When FPT
3
originates a call by connecting both line A and line B to −48 V, an electric current flows in line B of the FPI
23
so that the call origination by the FPT
3
is detected (that is, a call incoming from the emergency report line is received). Other aspects of the operation proceed similarly.
While the description below mainly concerns the emergency report system involving the fire fighting center, it can also be applied to the emergency report system involving the police headquarters.
FIG. 3
shows a construction of the emergency report system according to the related art.
The emergency report system according to the related art uses the line switching facilities of the switch
20
(a call path switch
22
, a call control unit
21
), to connect calls between a subscriber, a reception console, a command receiver apparatus, and a radio-equipped vehicle. A detailed description will be given below.
Referring to
FIG. 3
, the emergency report system comprises the switch main body (NW)
20
of the fire fighting center, reception consoles
40
1
-
40
n
for performing 119 call reception, inter-console monitoring/interruption, origination of a command to a related station, radio communication with radio-equipped vehicles, command receiver apparatuses
60
1
-
60
m
provided in each station, and radio apparatuses (RFU)
4
1
-
4
k
for performing radio communication with dispatched vehicles MS.
The switch main body NW
20
comprises the call control unit (CC)
21
for controlling major facilities (call processing and the like) of the switch main body, the call path switch (NSW)
22
for switching sound and information data, the emergency report reception trunk (FPI)
23
connected to an emergency report line, the command line trunk (LDS)
24
connected to the command receiver apparatus
60
, a radio circuit trunk (RLT)
25
connected to RFU
4
, a reception console connection package (ATT)
26
connected to the reception console
40
, an inter-console monitoring connection package (OTL)
27
for controlling sound monitoring/interruption connection between the reception consoles, and a radio apparatus connection control package (DMC)
28
for connecting the reception console
40
to RFU
4
.
The reception console
40
comprises a reception console control package (CTL)
41
for controlling major facilities of the reception console, a lamp/button info

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