JP3488176B2 - Communication control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device used as a network termination device in ISDN.

[0002]

2. Description of the Related Art In an ISDN subscriber system, a network terminating device (NT: DSU) is connected to a digital subscriber line (point U) and a terminal adapter (terminal adapter) is connected to the DSU at an interface point (S / T point). : TA) is connected and T
An existing terminal (for example, an analog telephone) used for an analog line is connected to A. In recent years, in general households that use ISDN, TAs that include the functions of the above DSU
The external telephone is used to connect the analog telephone to the U point with a single device. A TA incorporating such a DSU may be used by disconnecting the internal DSU function and connecting it to another DSU to function as a TA-only device, or by connecting another TA as a line terminating device. It is configured to be able to.

FIG. 5 shows the structure of a conventional TA which is used by connecting it to the above U point or S / T point. This TA is connected to the U point of ISDN that is transmitted by ping-pong, for example, and then DSU
S / T point terminating LSI 501 which functions as TA and S / T point terminating LSI 502 which functions as TA by connecting to the S / T point and K which adds a peripheral circuit.
Switching unit 504, U-point termination LSI 501 and S / T
Interface 5 for connection with point termination LSI 502
It is equipped with 05. In this configuration, when the TA function is used, the switching unit 504 is controlled by the setting of the control unit LSI 503 to operate only the S / T point termination LSI 502, and another DS is connected via the modular jack 506.
Connect to U. Further, when the DSU function is used, the switching unit 504 is controlled by the setting of the control unit LSI 503 to operate the U-point termination LSI 501 so that another TA can be connected to the modular jack 506.

Generally, in the above configuration, the U-point terminated LS
The I501 and the S / T point termination LSI502 are separate LSIs.
It is made up of chips. The subscriber transmission system is composed of a TCM (Time C
ompression Modulation) and echo canceller, there are two types of U-terminal terminating LSIs corresponding to these, and either one of them is combined with the S / T-point terminating LSI. Was the TA of.

In the above configuration, the transmission waveform on the S / T point line is regulated by the international standard. However, the receiver / driver built in the LSI at the U point terminal and the S / T point
Since there is no stipulation that the electric characteristics of the receiver / driver built in the LSI of the point termination unit be the same, there is no guarantee that these characteristics are the same. Therefore, in FIG.
As shown in, the U point termination LSI 501 and the S / T point termination L
The SI 502 is configured to be coupled with the transformers 511 and 512 and the transformers 521 and 522, respectively, to provide both the TA-only function and the DSU function.

[0006]

Conventionally, since the above-mentioned configuration is adopted, first, in order to provide both modes, an LSI having a TA function, an LSI having a DSU function, and an LSI for control are respectively provided. Since the clock source is provided, the wiring length becomes long to supply the clock using the same clock source, and the influence of electromagnetic radiation is given to the periphery. Therefore, the clock source is provided adjacent to each LSI. Moreover, in the conventional configuration, since each LSI operates with an independent clock, it is not possible to control the operation and stop of the function of each LSI. Therefore, in the past, in the event of a power failure,
Power supply to all LSIs and S
Line power was supplied to the / T point. For this reason, conventionally, there is a problem that the backup battery is quickly consumed at the time of a power failure and the operation as the TA or DSU cannot be continued for a long time.

The present invention has been made to solve the above problems, and it is an object of the present invention to reduce the power consumption of a communication control device having a DSU function and a TA function.

[0008]

According to the communication control device of the present invention, one end is connected to an ISDN network to terminate the ISDN U point interface, and a B channel signal is converted from a digital signal input from one end from the ISDN network. A D-channel signal is extracted and output to the other end, and a B-point signal and a D-channel signal input from the other end are sent from one end to the ISDN network. Connect to terminate the S / T point interface and connect the B channel signal and D
A format conversion means for converting the format of the S / T point side of the channel signal, and an S / T point terminating portion having R point interface means for outputting the B channel signal and the D channel signal to the R point, and a first And an operation mode designating section for setting the second operation mode, and the operation of the U-point terminating section and the format converting means and the R-point interface means of the S / T point terminating section depending on the setting of this operation mode. And a clock for supplying a clock of a predetermined frequency to the U point terminating unit, the S / T point terminating unit and the control unit from the supplied clock. It is composed of a frequency conversion section and a clock generation section for supplying a clock of a predetermined frequency to the clock frequency conversion means, and the U point termination section, the S / T point termination section and the control section are one L. Consists I, when the setting of the operation mode designating unit of the first operation mode, the control unit S / T
When the format conversion means of the point end portion is controlled to operate and the setting of the operation mode designating portion is the second operation mode, the control portion stops the operation of the U point end portion and the S / T.
The control is performed to stop the operation of the format conversion means of the point termination unit so that the R point interface means of the S / T point termination unit is in operation , and further, the clock frequency conversion unit.
To the controller for the first clock and lower frequency
Number of second clocks are supplied to the LSI.
Built-in, supplying the first clock and the second clock
Supply to the control unit when either the power supply or the clock supply is stopped.
The clock selection unit that switches the lock supply state and this clock
Switching the clock supply state to the control unit of the lock selection unit
Switching and the low power operating mode that controls the operating state of the control unit.
And a designation section .

According to the present invention, the first operation mode
When the U-point end part and the S / T-point end part are changed in format,
The function of the network terminating device is expressed by the replacement means, and the second operation is performed.
In working mode, the S / T point end part is connected to another DSU.
Continued, R point interface at S / T point termination section
The function of the terminal adapter is exhibited by the means. Well
In addition, the state where the control unit operates with a low clock and the control unit
The state of stopping is obtained.

In the above invention, the external interface for communicating between the own communication control device and the control unit of the other communication control device, and the control unit of the other communication control device of the own communication control device via the external interface. A controlled mode for controlling and a control mode designating unit for switching the self-control mode for controlling the other communication control device by the control unit of the self-communication control device via an external interface may be newly provided. In the self-control mode, the self-communication control device may be controlled. Also, S / T
A high-speed communication interface for connecting the R-point side output of the point terminating unit to another, a dependent synchronization mode in which the operation of this high-speed communication interface operates in synchronization with the clock of the network obtained via the U-point terminating unit, and a network It may be provided with a synchronization mode designating unit for setting one of the self-synchronization mode which operates independently of the clock of FIG.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings . This First, a description will be given reference case. Figure 1 is a block diagram showing a configuration example of a communication control device. The communication control device extracts a B channel signal and a D channel signal from a digital signal from the U point, and a U point terminating unit 101 that sends a predetermined digital signal from the B channel signal and the D channel signal to the U point. I have it.

Further, this communication control device is provided with a U-point terminating unit 10
S / T the B channel signal and D channel signal extracted by 1
A format conversion unit that converts the S / T point format signal into a U point format signal and a format conversion unit that outputs the B channel signal and the D channel signal to the R point. R for realizing the R point interface function by generating and extracting the B channel signal and the D channel signal from the signal from the R point
An S / T point terminating unit 102 having a point interface unit is provided.

Further, the communication control apparatus according to the present invention operates the U point terminating unit 101 and the S / T point terminating unit 10 according to the input conditions.
The control unit 103 for controlling the operations of the format conversion unit and the R point interface unit in FIG. In addition, in the communication control device, the U point terminating unit 101, the S / T point terminating unit 102, the control unit 103, and the clock frequency converting unit 104 are configured by one LSI, and the U point terminating unit 10 is used.
1, the S / T point termination unit 102 and the control unit 103 are configured to operate with the clock supplied from the clock frequency conversion unit 104.

Further, this communication control device has a control unit 103.
Operation mode designation unit 10 for setting conditions to be input to
6 and another T having a signal standard different from that of the S / T point terminating unit 102.
Transformers 111 and 112 for connecting A and DSU
And a modular jack 107 for realizing a connection system using a connector, and an external clock generator 108 for supplying a clock to the clock frequency converter 104. The clock frequency conversion unit 104 divides or multiplies the clock obtained from the external clock generation unit 108 to generate a predetermined frequency for each of the U point terminating unit 101, the S / T point terminating unit 102, and the control unit 103. Supply the clock. Further, the communication control device is provided with a power supply unit (not shown), and is configured to supply power to each part from an external commercial power supply or a built-in backup battery.

This communication control device has an operation mode designating unit 1
In 06, two operation modes can be set: a DSU mode in which the DSU function is developed and a TA mode in which the DSU function is stopped and only the TA function is developed. D
When the SU function is developed, the S / T point terminal portion 10
2 at least the format conversion unit and the U-point termination unit 101
And are operating. In TA mode,
The U point terminating unit 101 stops operating, and the S / T point terminating unit 10
In this state, only the R point interface unit 2 is operating.

The operations of the two modes in this communication control device will be described below. When the operation mode designation unit 106 is set to the DSU mode, the control unit 103
The U-point termination unit 101 is operated. At this time, in the S / T point termination unit 102, the format conversion unit is operating.
Therefore, if another TA or the like is connected to the modular jack 107 by a connector, these devices and the S / T point terminating unit 102 are connected via the transformers 111 and 112, and the communication control device Network terminator (D
SU). In this DSU mode, the S / T point termination unit 10 is controlled by the control unit 103.
It is also possible to operate the R point interface section 2 to cause the communication control device to function as a terminal adapter (TA) with a built-in DSU.

On the other hand, the setting of the operation mode designation unit 106 is set to T.
When the A mode is set, the control unit 103 controls so as to stop the operation of the U point terminating unit 101 and stop the format conversion unit of the S / T point terminating unit 102. As a result, first, since the U-terminal unit 101 does not operate,
The communication control device does not accept a signal from the point U side. On the other hand, the S / T point termination unit 102 includes the transformer 111,
It is connected to the modular jack 107 via 112. Therefore, this communication control device connects another DSU to the modular jack 107 by a connector, and controls the control unit 103.
By operating the R point interface section of the S / T point terminating section 102 under the control of 1., it functions as TA.

As described above, in the communication control device of FIG.
It becomes possible to operate by switching the state in which the function of the SU is also expressed. Moreover, since this switching is realized by one LSI, a plurality of clock generation units are not required. In addition, the transformer is connected to the S / T terminal and the S
It may be arranged only between the point / T. As a result, power consumption of the communication control device, it becomes possible to suppress.

[0019] One technique, described embodiments of the present invention. FIG. 2 is a configuration diagram showing the configuration of the communication control device according to the present embodiment. This communication control device includes a U point terminating unit 101, an S / T point terminating unit 102, a control unit 103 that controls the operations of the U point terminating unit 101 and the S / T point terminating unit 102 according to input conditions, Clock frequency converter 2
04, and these are configured by one LSI. In addition, in the present embodiment, a clock selection unit 204a is newly provided in this LSI, and the LSI shown in FIG.
In the communication control device , in addition to the clock (normal) directly supplied to the control unit 103, a low speed clock having a frequency lower than this clock is output from the clock frequency conversion unit 204.

Also in this communication control device, the operation mode designating unit 106 for setting the condition to be inputted to the control unit 103, the S / T point terminating unit 102 and other TAs or DSUs having different signal standards are provided. Transformer 111 for connection,
112, a modular jack 107 for realizing a connection method using a connector, and a clock frequency conversion unit 20.
4 is provided with an external clock generator 108 for supplying a clock, and the same reference numerals as those in FIG. 1 denote the same components.

The clock selection unit 204a normally supplies the input normal clock to the control unit 103.
When the low-speed clock operation mode is controlled by the control of the low-power operation mode designating unit 209, the input low-speed clock is selected and supplied to the control unit 103. When the clock stop operation mode is controlled by the control of the low power operation mode designating unit 209, the clock selecting unit 204a
The supply of the clock to the control unit 103 is stopped. Further, the control unit 103 switches to the low speed clock mode or the clock stop operation mode under the control of the low power operation mode designating unit 109.

The present communication control device is also provided with a power supply unit (not shown), and power is supplied to each part from an external commercial power supply or a built-in backup battery. In the present embodiment, the U-point terminating unit 101, the S / T point terminating unit 102, and the control unit 103 operate with the supplied power while the power is being supplied. However, when the power supply is stopped, the U-point terminating unit 101 and the S / T-point terminating unit 102 are
It operates with the local power supply supplied from the point, but the control unit 103 does not operate. In this state, the S / T point termination unit 102
Is in a state where only the format conversion unit operates.

Further, in the event of a power failure or the like, power is supplied from a backup battery (not shown), but the low power operation mode designating unit 209 supplies power to the backup battery from a commercial power source due to, for example, a power failure. Is detected, the low-speed clock mode or the clock stop operation mode is switched. Further, the low power operation mode designating unit 209 may be configured to detect that the voltage of the supplied power supply has dropped and switch the low speed clock mode or the clock stop operation mode.

The operation in the low speed clock mode or the clock stop operation mode will be described below. The communication control device of the present embodiment also has two operation modes, that is, the DSU mode and the TA mode, as in the above-described embodiment.
The clock stop operation mode in the SU mode will be described.

In the DSU mode, the U point termination unit 10
1 is operated and the format conversion unit of the S / T point terminating unit 102 is operated, and another TA can be connected to the modular jack 107. At this time, in normal operation, S /
40V line power is supplied to the T point. Above D
In the SU mode, when the low power operation mode designating unit 209 detects a power failure, the low power operation mode designating unit 209
First, the clock selection unit 204a is set to the clock stop operation mode. As a result, the clock selection unit 204a stops supplying the clock to the control unit 103. Further, the low power operation mode designating unit 209 stops the operation of the control unit 103. In addition, the supply of power to the U point terminal portion 101 and the S / T point terminal portion 102 is also stopped.

From the above, the U-point terminating portion 101, S
The / T point terminating unit 102 is operated by the local power feeding from the U point, and in the S / T point terminating unit 102, only the format conversion unit is operating. Further, the station power is fed as line power from the modular jack 107 to the S / T point side. Therefore, in this case, the communication control device is in a state in which only the DSU function is exhibited. Further, in this case, since the function as the DSU is exhibited by the local power supply, the power supply from the backup battery is not required.

Next, the low-speed clock operation mode in the above-mentioned DSU mode in this communication control device will be described. In the DSU mode, when the low power operation mode designating unit 209 detects a power failure, the low power operation mode designating unit 209 first sets the clock selection unit 204a to the low speed clock operation mode. As a result, the clock selection unit 204a is in a state of supplying the low-speed clock to the control unit 103. In addition, the low power operation mode designating unit 20
The control unit 9 controls the control unit 103 to operate at a low speed clock and, in addition, makes the line power supply to the S / T point stopped. In this low-speed clock mode, power is being supplied from the backup battery. However, as described above, the control unit 103 whose power consumption is suppressed
As long as the U-point terminating unit 101 and the S / T-point terminating unit 102 operate, the power supply is sufficient, and the power consumption is as low as possible. Therefore, according to the present embodiment, the communication control device can operate for a longer period of time even during a power failure.

Next, the low-speed clock operation mode in the TA mode described above in this communication control device will be described. In the TA mode, the U-point terminating unit 101 stops operating, the format conversion unit of the S / T point terminating unit 102 stops, the R-point interface unit operates, and another DSU is connected to the end of the modular jack 107. ing. Therefore, in the TA mode, the control unit 103
Must be running and the clock stop mode is not selected.

In the TA mode, when the low power operation mode designating unit 209 detects a power failure, the low power operation mode designating unit 209 first sets the clock selection unit 204a to the low speed clock operation mode. As a result, the clock selection unit 204a is in a state of supplying the low-speed clock to the control unit 103. In addition, the low power operation mode designating unit 209
Controls the control unit 103 to operate at a low speed clock. As a result, the power consumption of the control unit 103 is reduced. At this time, although the control unit 103 is in a slow operation state, it is possible to operate the R point interface unit of the S / T point terminating unit 102 and take out the B channel signal.

As described above, also in the communication control device according to the present embodiment, as in the device shown in FIG. 1, in the operation mode designating unit 106, the DSU mode in which the DSU function is operated and the DSU function is stopped. It is possible to set two operation modes, that is, a TA mode in which only the TA function is operated. As described above, also in the communication control device of the present embodiment, one LSI can switch and operate between the state in which only TA functions and the state in which DSU functions are also expressed. In addition, this switching is performed by one LS.
Since it is realized by I, a plurality of clock generators are not required. In addition, the transformer is connected to the S / T terminal and the S / T.
It only needs to be placed between the points. As a result, also in this embodiment, the power consumption of the communication control device can be suppressed.

In addition, the communication control device is controlled to operate in the low speed clock mode or the clock stop operation mode by the control of the low power operation mode designating unit 209.
As a result, this communication control device can operate for a longer period of time because it becomes possible to further reduce power consumption when it cannot operate from a commercial power source due to a power outage or the like and must operate with a backup battery. be able to.

[0032] One technique, a description of another embodiment of the present invention. FIG. 3 is a configuration diagram showing a configuration of the communication control device in the present embodiment. This communication control device is newly provided with an external interface section 313 and a control mode designating section 314 in addition to the configuration of the above-described embodiment shown in FIG. In the present embodiment, when the present communication control device is provided for each of a plurality of U points, the control units of the respective communication control devices are connected via an external interface unit, and the communication control device on the master side controls The mode designating section is set to the self-control mode to operate the control section, and in other slave side communication control devices, the control mode designating section is set to the controlled mode to stop the operation of the control section. By doing so, it is not necessary for the communication control device on the slave side to have a storage means for storing a program for operating the control unit.

[0033] One technique, a description of another embodiment of the present invention. FIG. 4 is a configuration diagram showing a configuration of the communication control device according to the present embodiment. This communication control device is provided with a high-speed communication interface unit 401 and a synchronization mode designating unit 402 in addition to the configuration of the above-described embodiment shown in FIG. 3, and is made compatible with a trunk of a key telephone or a switchboard (PBX). It is a thing.

For example, when the communication control device of this embodiment is used for a button telephone or an I external trunk of a PBX, the U point terminating unit 101 or the S / T point terminating unit 102 is set to the termination state. That is, the operation mode designation unit 106 sets the DSU mode, and the control unit 103 controls the U
The point terminal portion 101 is in the operating state, and the S / T point terminal portion 1
The 02 format conversion unit is put into operation. In this way, the DSU mode is set, and the B channel signal is passed through the high-speed communication interface unit 401 to the key telephone or PBX.
When connected to the exchange section, the communication control device functions as an I external line trunk. At this time, the line is terminated by the U point terminating unit 101 or the S / T point terminating unit 102, and the high speed communication interface unit 401 is subordinately synchronized with the network by the synchronization mode designating unit 402. Run in mode.

When the communication control device of this embodiment is used for a button telephone or an I extension trunk of a PBX,
The operation mode designating unit 106 sets the TA mode, and by the control of the control unit 103, the operation of the U point terminating unit 101 is stopped, the format conversion unit of the S / T point terminating unit 102 is stopped, and the R point interface unit is set. To the operating state. In this way, the TA mode is set, and the B channel signal is transmitted through the high-speed communication interface unit 401 to the key telephone or PB.
When connected to the switching unit of X, the communication control device functions as an I extension trunk. At this time, the communication control device is not connected to the point U and cannot synchronize with the network.
The high speed interface unit 401 is operated in a self-synchronization mode independent of the network. As described above, according to the present embodiment, the communication control device can be used for both the I external trunk and the I internal trunk.

[0036]

As described above, according to the present invention,
By combining the operations of the U-point terminating unit and the S / T-point terminating unit integrated in one LSI, the DSU function and the TA-only function are switched, so that multiple clock sources are not required. Further, if a transformer is provided only between the S / T point terminal and the S / T point, connection with other equipment becomes possible, and the number of parts required for the device configuration can be reduced. As a result, according to the present invention, the DSU function and the T
An excellent effect that the power consumption of the communication control device having the function A can be reduced is obtained. Also the clock frequency
From the converter to the controller, the first clock and lower
A second clock having a high frequency is supplied, and L
It is built into SI and supplies the first clock and the second clock.
Clock control or clock supply stop.
A clock selection unit that switches the clock supply state to
Clock supply status for the control unit of this clock selection unit
Low-power operation that controls the switching of the
Since it is equipped with a work mode specification section, the control section can be
The state of operating with the clock and the state of stopping the control unit
And the power consumption can be further suppressed.

[Brief description of drawings]

1 is a configuration diagram showing a configuration example of a communication control device.

2 is a block diagram showing a configuration of a communication control unit according to the embodiment of the present invention.

FIG. 3 is a configuration diagram showing a configuration of a communication control device according to another embodiment of the present invention.

FIG. 4 is a configuration diagram showing a configuration of a communication control device according to another embodiment of the present invention.

FIG. 5 is a configuration diagram showing a configuration of a TA having a conventional DSU function.

[Explanation of symbols]

101 ... U-point terminal, 102 ... S / T-point terminal, 103
Control unit 104 Clock frequency conversion unit 106 Operation mode designation unit 107 Modular jack 108
External clock generators 111, 112 ... Transformers.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinya Uegaki 2-3-1, Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kaori Narahara 2-3-3, Otemachi, Chiyoda-ku, Tokyo No. 1 in Nippon Telegraph and Telephone Corp. (72) Inventor Hiroyuki Nishi, 2-3-1, Otemachi, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corp. (56) Reference JP-A-11-340973 (JP, A) Kaihei 4-352531 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 29/02 H04M 11/00 303

Claims (3)

(57) [Claims] 1. One end is connected to an ISDN network to terminate the ISDN U-point interface, and a B channel signal and a D signal are input from the ISDN network digital signal input from the one end.
A channel signal is extracted and output to the other end, and a B point signal and a D channel signal input from the other end are sent from the one end to the ISDN network. Connect and terminate the S / T point interface, and S / T of B channel signal and D channel signal.
A format converting means for converting the format on the point side, an S / T point terminating portion having an R point interface means for outputting a B channel signal and a D channel signal to the R point, a first operation mode and a second operation mode. And the operation of the format conversion means and the R-point interface means of the S / T point terminal section by the operation mode designating section for setting the operation mode A control unit for controlling communication and a clock of a predetermined frequency required for each of the U point terminating unit, the S / T point terminating unit, and the control unit from the supplied clock. The clock frequency conversion unit and a clock generation unit that supplies a clock of a predetermined frequency to the clock frequency conversion unit, and the U point terminating unit and the S / T point terminating unit. The control unit is composed of one LSI, and when the operation mode designating unit is set to the first operation mode, the control unit operates the format conversion means of the S / T point terminating unit. Control, and when the setting of the operation mode designating section is the second operation mode, the control section stops the operation of the U point terminating section, and the format converting means of the S / T point terminating section. Control for stopping the operation of the S / T point end portion and the R point interface means operating.
In addition, the clock frequency conversion unit is connected to the control unit.
The first clock and a second clock with a lower frequency.
Is provided in the LSI, and is supplied with the first clock.
Either the supply of the second clock or the stop of the clock supply
Switching the clock supply state to the control unit
Clock selection unit and clock supply to the control unit of the clock selection unit
Controls state switching and operating state of the control unit
A communication control device, comprising: a low-power operation mode designating unit . 2. The communication control device according to claim 1, wherein communication is performed between the control units of the own communication control device and another communication control device.
And an external interface for controlling the external interface by the control unit of the other communication control device.
Controlled mode that controls the local communication control unit via the interface
And control of the other communication control device by the external interface.
The self-control mode performed by the control unit of the self-communication control device
A communication control device, which is newly provided with a control mode designating section for switching modes . 3. The communication control device according to claim 1 or 2, wherein a high speed communication connecting the R point side output of the S / T point terminating portion to another is connected.
Signal interface and the operation of this high-speed communication interface by the U-point termination unit.
Dependency that operates in synchronization with the clock of the network obtained via
Operates independently of synchronous mode and clock of the network
Specify the synchronization mode to be set to one of the self-synchronization modes
Communication control apparatus characterized by comprising a means.