JPH04345234A - Isdn terminal equipment - Google Patents

Abstract

PURPOSE:To attain miniaturization and economy of the ISDN terminal equipment. CONSTITUTION:The ISDN terminal equipment incorporates a conventional DSU (line terminator) in its inside and extract a power supplied through an ISDN line 2 via a line I/F section 11, the extracted power is converted into a prescribed voltage V by a DC / DC converter 12 and the converted power is fed to each section in an ISDN terminal equipment section 10, then the power supply conversion efficiency is improved. Furthermore, since the transmission of a signal between a DSU section 13 having the line termination function and an I interface section 14 implementing protocol processing is implemented not in a form of an AMI signal but in a form of a binary signal, both the sections are connected directly. As a result, components such as a transformer, a receiver and a driver or the like having been connected between the DSU section 13 and the I interface section 14 in a conventional terminal equipment are not required and the terminal equipment is formed with a small size at a low cost.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN terminal device that is accommodated in an ISDN network and communicates voice signals and data signals.

0002

2. Description of the Related Art Conventionally, the connection between an ISDN line and a terminal device is as shown in FIG. That is, when the terminal device 4 communicates with the ISDN exchange network 1 via the ISDN line 2, a DSU 3 that terminates the ISDN line 2 is placed between the ISDN line 2 and the terminal device 4, and communication is performed via the DSU 3. In addition to communication, data transmission between the DSU3 and the terminal device at point T can be expected to be stable, considering that multiple terminal devices are connected via multi-bus at separate locations from this point T. A
This is done using MI signals. In order to satisfy the above conditions, conventionally, in the DSU 3 and the terminal device 4,
An LSI each having an I-interface termination function and an LS that executes I-interface protocol processing.
I are arranged, and electrical parts such as a transformer and a driver/receiver are also arranged. Also, ISDN
The power supplied from the line 2 to the terminal device 4 is first supplied to the DSU
The power is converted by the DC/DC converter provided in the DSU 3 and supplied to the above-mentioned components in the DSU 3, and the power is also converted by the DC/DC converter and supplied from the DSU 3 to the terminal device 4. The signal is converted again by a DC/DC converter provided in the terminal device 4 and supplied to each component in the terminal device 4.

0003

[Problem to be solved by the invention] However, in recent years, DSU
There is a movement toward accommodating AMI signals in terminal devices, and in such a situation, circuit components such as transformers and drivers/receivers for transmitting AMI signals will be used in each of the DSU 3 and the terminal device 4. There was a problem that the equipment was expensive because of the Also, ISDN
Since the power supplied from the line 2 to the terminal device 4 is converted twice by these two DC/DC converters placed inside the DSU 3 and inside the terminal device 4, there is also the problem that power efficiency deteriorates. .

0004

[Means for Solving the Problems] In order to solve such problems, an ISDN terminal device according to the present invention has a DSU function section having an ISDN line termination function, and a binary signal for transmission between this DSU function section. and a power supply section that converts the power supplied from the ISDN exchange network and supplies the converted power to each section including the DSU function section and the I interface section. It was designed to be accommodated in

[0005]

[Operation] Therefore, the power supplied from the ISDN exchange network can be converted only by the power supply section and supplied to each section within the ISDN terminal device, so that the efficiency of power conversion is improved. Further, since the transmission between the DSU function section and the I interface section is performed by binary signals, these sections can be directly connected, and as a result, the number of components such as a transformer, driver/receiver, etc. connected between them can be reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an ISDN terminal device of the present invention. In the figure, 10 is an ISDN terminal unit, 20 is a slave unit that is wirelessly connected to this ISDN terminal unit 10, and this ISDN terminal unit 10 is a line I/F unit 1 that has an interface function with an ISDN line 2.
1. A DC/DC converter 12 that converts the power supplied from the ISDN line 2 to voltage V and supplies this power to each part of the ISDN terminal unit 10, a DSU unit 13 having a function of terminating the ISDN line 2, and an ISDN exchange network. I interface unit 14, ISD, which executes protocol processing for 1
A control unit 15 that controls calls to and from the N exchange network 1, an analog control unit 16 that controls transmission and reception of various analog signals such as voice signals and tone signals, and a display unit 17 that displays various displays.
, an operating section 18, and a wireless transmitting/receiving section 19. Further, the handset 20 includes a wireless transmitter/receiver 21, a CPU 22,
It is comprised of various keys 23, an IDROM 24, a tone ringer 25 that outputs various ring tones, and the like.

[0007] That is, this ISDN terminal device houses a conventional DSU (line termination unit) inside, and uses the power supplied from the ISDN line 2 to the line I/F section 1.
At the same time, the extracted power is converted into a predetermined voltage V by a DC/DC converter 12 and supplied to each part in the ISDN terminal unit 10. Furthermore, since signals are transmitted and received between the DSU unit 13, which has a line termination function, and the I interface unit 14, which performs protocol processing, as binary signals instead of AMI signals,
These are directly connected, and as a result, the transformer, receiver driver, etc. between the DSU section 13 and the I interface section 14 are removed.

[0008] This ISDN terminal device is a slave unit 2.
0 and when the CPU 22 detects a call operation based on a key operation of this handset 20 connected wirelessly,
The data is transmitted to the ISDN terminal unit 10 via the wireless transmitting/receiving unit 21 and antenna A2. Control unit 15 in the ISDN terminal unit 10
When receiving this calling information via the antenna A1 and the wireless transmitter/receiver 19, the I interface unit 14 notifies the I interface unit 14 of this fact, and as a result, the I interface unit 14 transmits the call information to the DSU unit 13 and the line I/F unit 11. A calling protocol is carried out with the ISDN switching network 1 via the caller, and the call is started when the other party responds. The same applies when incoming call information arrives from the other party via the ISDN line 2. After the I interface section 14 executes the protocol processing for the incoming call, a ringtone sounds on the speaker SP, and at this time the handset 20 When the user performs an off-hook operation, this off-hook information is transmitted to the I interface section 14 in the ISDN terminal section 10, and as a result, a call is started between the other party by executing protocol processing regarding the response of the I interface section 14. be done.

Next, FIG. 2 is a block diagram showing another embodiment of this ISDN terminal device. This embodiment shows an example in which the handset 20 wirelessly connected to the ISDN terminal section 10 is not accommodated in contrast to the above embodiments. In this case, the call origination operation and the incoming call response operation are performed by operating the operation unit 18, and the control unit 15 directly detects these operations and transmits the fact to the I interface unit 14, and the I interface unit By performing the corresponding protocol processing in step 14, it becomes possible to make a call to the other party and respond to an incoming call from the other party.

[0010] Thus, the present invention transforms the conventional DSU into an I
A DSU section 13 that accommodates the SDN terminal device, converts the power supplied from the ISDN line 2 into voltage using only one DC/DC converter 12 and supplies it to each section of the ISDN terminal device, and has a line termination function. Data is transmitted between the I interface units 14 that perform protocol processing using binary signals, and as a result, the number of transformers, drivers, and receivers conventionally used in these units can be reduced.

[0011]

[Effects of the Invention] As explained above, according to the present invention,
Since the power supplied from the ISDN exchange network is converted only by the power supply section and can be supplied to each section within the ISDN terminal device, there is an effect that the efficiency of power conversion is improved. Also, the transmission between the DSU function section and the I interface section is 2
Since this is carried out using a value signal, it is possible to directly connect these parts, and as a result, the number of components such as a transformer, driver/receiver, etc. connected between these parts can be reduced, and the device can be constructed at a low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the invention.

FIG. 3 is a configuration diagram of a system in which a conventional ISDN terminal device is accommodated.

[Explanation of symbols]

1 ISDN switching network 2 ISDN line 10 ISDN terminal section 11 Line I/F section 12 DC/DC converter 13 DSU Department 14 I interface section

Claims (1)

[Claims] [Claim 1] An IS that communicates with an ISDN switching network via an ISDN line and a DSU that terminates this ISDN line.
In the DN terminal device, the DSU function unit having the ISDN line termination function and the transmission between the DSU function unit and the
an I interface section that uses a value signal, and the ISD
a power supply unit that converts the power supplied from the N exchange network and supplies the converted power to each unit including the DSU function unit and the I interface unit, and houses the DSU function unit therein. ISD characterized by
N terminal device.