JP2003234845A - Terminal adapter available in line switching mode or leased line mode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a BRI (basic rate interface) I/F part even in a leased line mode in a terminal adapter that uses both a line switching mode and the leased line mode. <P>SOLUTION: This terminal adapter 1 which is provided with a terminal I/F part 11, a PRI I/F part 13 and the BRI I/F part 16 and can be shared in the line switching mode and the leased line mode is provided with a signal processing part 12 for transmitting and receiving a signal between the I/F part 11 and the I/F part 13 and selectively transmitting the receiving a signal between the I/F part 16 and the I/F part 11 or the I/F part 13, and a configuration information holding part 15 for holding positional information of data to be mounted on a PRI signal. The signal processing part 12 divides a signal from the I/F part 11 to the I/F part 13 and the I/F part 16 and collects signals from the I/F part 13 and the I/F part 16 to the I/F part 11 in a line connection mode. The signal processing part 12 collects a signal from the I/F part 11 and a signal from the I/F part 16 to the I/F part 13 and divides a signal from the I/F part 13 to the I/F part 11 and the I/F part 16 in the leased line mode. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method using an ISDN line, a communication device using an ISDN line, a communication method using a primary group interface (hereinafter referred to as PRI) leased line, and a PRI leased line. The communication device used.

[0002]

2. Description of the Related Art Conventionally, in a device which shares a PRI circuit switching device and a PRI leased line terminating device, when used as a PRI circuit switching device (circuit switching mode), 24B channel is a PRI and 2B channel is a basic interface.
In the case of using as a PRI leased line terminating device (dedicated line mode), a dedicated line PRI and a terminal interface for connection with the data terminal device. However, in this leased line mode, since the BRI is not used, the BRI interface section is not used and wasted.

[0003]

SUMMARY OF THE INVENTION According to the present invention, in a device that shares PRI circuit switching and BRI circuit switching (circuit switching mode) and PRI leased line termination (dedicated line mode),
BR that is wasted when used as a dedicated line termination
It is an object of the present invention to provide a terminal adapter (data circuit terminating device) that can effectively utilize the I interface unit as an interface with a data terminal device.

[0004]

The present invention uses the BRI port (BRI interface section) of a terminal adapter as an interface with the network side in the circuit switching mode,
In the leased line mode, by using as an interface with the data terminal device, in the leased line mode, the terminal interface and the BRI interface are concentrated and cross-connected with the PRI interface unit,
The RI port is used effectively.

In order to solve the above problems, the present invention provides a terminal interface section, a PRI interface section and a BRI.
Interface part, and the PRI interface part is P
A line that is connectable to an RI circuit switched network and has a BRI interface unit connected to the BRI circuit network, and a dedicated line mode in which the PRI line interface unit is connected to a PRI leased line. In a terminal adapter that can be used in an exchange mode or a dedicated line mode, a signal is transmitted and received between a terminal interface unit and a PRI interface unit, and a signal is selectively transmitted and received between the BRI interface unit and the terminal interface unit or the PRI interface unit. And a configuration information holding unit that holds the position information of the data mounted in the time slot of the PRI signal that passes through the PRI interface unit. In the line connection mode, the signal processing unit is connected to the terminal interface unit. Signal of PRI interface and BRI interface The PRI interface unit and the BRI interface unit collect signals from the PRI interface unit and the BRI interface unit in the terminal interface unit. In the leased line mode, the signals from the terminal interface unit and the BRI interface unit are collected into the PRI interface unit, Signals from the interface unit are sent to the terminal interface unit and BR
It is designed to be divided into I interface parts.

Further, the present invention provides a terminal adapter which can be used in the above-mentioned circuit switching mode or leased line mode, in which signal division or signal aggregation performed by a signal processing unit is performed.
It is performed based on the position information of the data held in the configuration information holding unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of a circuit switching mode, which is a communication mode in which communication is carried out by circuit switching between opposing data terminal devices using a terminal adapter according to the present invention, will be described with reference to FIG. 1 and 2,
The subscript a indicates a device on the outgoing data terminal device side, and the subscript b indicates a device on the incoming data terminal device side. In the case where no subscript is given, each device is commonly described.

As shown in FIG. 1, the circuit switching mode for communicating via a circuit switching network is as follows: a terminal adapter 1a to which a data terminal device 3a is connected via a terminal interface 5a and a data terminal via a terminal interface 5b. Between the terminal adapter 1b to which the device 3b is connected,
PRI line network 7 accommodating PRI lines 71a and 71b
(Switch network) and B that accommodates BRI lines 81a and 81b
This is a mode in which the data terminal devices 3a and 3b are connected to each other via the RI network 8 (switching network) and communicate with each other via the switching network.

The PRI line 71 accommodates a 24B channel. The BRI line 81 accommodates the 2B channel. The terminal interface 5 transfers data at a speed corresponding to a maximum of 26B. The terminal adapter 1a and the terminal adapter 1b are dial-up connected by a PRI circuit switching network 7 and a BRI circuit switching network 8. In the terminal adapter 1a, the data equivalent to 26B from the data terminal device 3a is divided into the 24B channel and the 2B channel by the terminal adapter 1a, and the PRI interface unit to the PRI line 71a and the BRI interface unit to the BRI line 81.
output to a. In the terminal adapter 1b, the data of the 24B channel via the PRI interface and the data of the 2B channel via the BRI interface are collected and output to the data terminal device 3b as data equivalent to 26B.

Next, referring to FIG. 2, PR between data terminal devices facing each other using the terminal adapter according to the present invention.
An outline of a leased line mode, which is a communication mode in which communication is performed using an I leased line, will be described.

As shown in FIG. 2, in the leased line mode in which communication is performed via the PRI leased line, the data terminal device group 31a operates via the terminal interface 5a and the BRI interface 8 operates.
The terminal adapter 1a to which the data terminal device 32a is connected via 2a, and the data terminal device group 31b via the terminal interface 5b are connected to the BRI interface 82.
The terminal adapter 1b to which the data terminal device 32b is connected via b is connected via a dedicated PRI line 9.

The PRI leased line 9 accommodates a 24B channel. The terminal interface 5 transmits up to 24B of data. The BRI interface 82 transmits 2B channel data. In the terminal adapter 1a, data corresponding to a maximum of 24B received from the data terminal device group 31a from the terminal interface section (when the maximum 24B is used, the data terminal 32a does not perform communication) and B
The 2B data received from the data terminal device 32a from the RI interface unit is also sent to the PRI dedicated line 9 as 24B channel data. In the terminal adapter 1b, the data of the 24B channel received from the PRI leased line 9 is divided, and data of up to 24B is sent to the data terminal device group 31B via the terminal interface unit.
2B data is sent to the data terminal device 32b via the BRI interface unit. Data terminal device group 31
a, 31b and data terminal devices 32a, 32b
They communicate with each other.

Hereinafter, the mode of FIG. 1 is referred to as a circuit switching mode, and the mode of FIG. 2 is referred to as a leased line mode. Also, B in FIG.
The mode of the RI interface unit is referred to as NT (operating by the function of the subscriber device) mode, and the mode of the BRI interface unit of FIG. 2 is referred to as TE (operating as the terminal side) mode.

An outline of the configuration of the terminal adapter 1 according to the present invention will be described with reference to FIG. A terminal adapter 1 according to the present invention includes a terminal interface unit 11,
The signal processing unit 12, the PRI interface unit 13, the control unit 14, the configuration information holding unit 15, and the BRI interface unit 16 are included in the configuration. The respective components are connected by the control bus 8.

The terminal interface unit 11 is connected to the data terminal device 3 connected via the terminal interface 5 shown in FIG. 1 or the data terminal device group 31 connected via the terminal interface 5 shown in FIG. It is an interface for exchanging information.

The signal processing unit 12 distributes the data from the terminal interface unit 11 to the PRI interface unit 13 and the BRI interface unit 16 in a circuit switching manner and sends out the data, and at the same time, the PRI interface unit 13 and the BR.
With the function of sending out the data from the I interface unit 16 to the terminal interface unit 11 collectively, and the dedicated line mode,
The data from the terminal interface unit 11 and the data from the BRI interface unit 16 are sent together to the PRI interface unit 13, and the data from the PRI interface unit 13 is sent to the terminal interface unit 11 and the B
It has a function of distributing to the RI interface unit 16.

The PRI interface section 13 is an interface for accommodating 24B channels from the PRI line 71 or the PRI leased line 9.

The control unit 14 has a function of comprehensively controlling each constituent element in the terminal adapter 1, and controls the function of the signal processing unit 12 so as to match each interface in accordance with the circuit switching mode and the dedicated line mode. It has the function of controlling the flow of data between the two.

The configuration information holding unit 15 has a function of holding various setting information in the circuit switching mode and the leased line mode.

The BRI interface section 16 is an interface section capable of interfacing with the BRI line 81 or the BRI interface 82.

The schematic configuration of the BRI interface section 16 in the terminal adapter 1 according to the present invention will be described with reference to FIG. The BRI interface unit 16 uses the BR
Physical interface unit 161 connected to the I line 81
A circuit switching mode control unit 162 that controls the circuit switching mode when the physical interface unit 161 is connected to the BRI line network 8 via the BRI line 81; and the physical interface unit 161 transfers data via the BRI interface 82. The leased line aspect control unit 163 that controls the leased line aspect when connected to the terminal device 32, and the route between the physical interface unit 161 and the signal processing unit 12 via the circuit switching aspect control unit 162 or the leased line aspect control. It is configured to have changeover switches 164a and 164b that are switched via the unit 163.

The circuit switching mode control unit 162 comprises a layer 1 processing unit 1621 and a call control unit 1622 for controlling the call to the BRI line network 8. The leased line mode control unit 163 is configured to include a layer 1 processing unit 1631 and a call control unit 1632 that performs call control to the data terminal device 32.

The signal flow in the terminal adapter 1 in the circuit switching mode will be described with reference to the block diagram of FIG. In the circuit switching mode, the 24B channel accommodated in the PRI interface unit 13 sent to the data terminal device 3 of the communication partner via the PRI circuit network 7 and the data terminal of the communication partner via the BRI circuit network 8 are connected. The data of the 2B channel accommodated in the BRI interface unit 16 sent to the device 3 is assembled in the signal processing unit 12 in a predetermined order indicated by the configuration information held in the configuration information holding unit 152, and a maximum of 1664 kbps (26B Corresponding signal is formed and sent to the data terminal device 3 via the terminal interface unit 11. In addition, the maximum of 16 data sent from the data terminal device 3 via the terminal interface unit 11
A signal of 64 kbps (corresponding to 26B) is transmitted to the signal processing unit 12
24B channel and the BRI interface unit 16 which are divided according to a predetermined standard held in the configuration information holding unit 15 and accommodated in the PRI interface unit 13.
Assigned to the 2B channel accommodated in the PRI line network 7
And the BRI line network 8 to send to the communication partner.

Thus, in the circuit switching mode, a maximum of 26B of data can be transmitted and received between the opposing data terminal devices.

The signal flow in the terminal adapter 1 in the leased line mode will be described with reference to the block diagram of FIG. In the dedicated line mode, the terminal interface unit 11 accommodates the data terminal device group 31 via the terminal interface 5, and the BRI interface unit 16 accommodates the data terminal device 32 via the BRI interface 82.
The PRI dedicated line 9 is accommodated in the PRI interface unit 13.

The signal processing unit 12 is sent from the data terminal device of the communication partner via the PRI dedicated line 9, 24.
The data of the B channel is set in the configuration information holding unit 15 and the communication speed with each data terminal device 31 (hereinafter referred to as the data terminal device rate. The range is 0 to 1536 kbi.
At t / s, 64 kbit / s corresponds to 1B channel), and the signal used for communication with each data terminal device is PR.
The position of the PRI signal in the I line in the time slot TS (hereinafter referred to as DTE start position), the number of B channels used in the BRI line (hereinafter referred to as BRI setting, range is 0 to 2B), and the signal used for BRI communication. Is divided based on the position of the PRI signal in the time slot TS of the PRI line (hereinafter referred to as the BRI start position),
It is sent to the data terminal device group 31 and the data terminal device 32.

Further, the signal processing unit 12 receives the data of up to 24B from the data terminal device group 31 and the data of 2B from the data terminal device 32 based on the configuration information held in the configuration information holding unit 15. 2 on the PRI signal
It is sent to the PRI dedicated line 9 as 4B channel data.

Thus, in the leased line mode, in addition to the terminal interface unit 11, the BRI interface unit 1
Since 6 can be used for connection with the data terminal device, the operation of the terminal adapter 1 can be made flexible, and a maximum of 24B of data can be transmitted and received between the opposing data terminal devices.

Allocation of time slots TS of the PRI signal output (received) from the signal processing unit 12 in the dedicated line mode will be described with reference to FIGS. 7 to 10. Using FIG. 7, the data terminal device rate is 256 kbit / s (4
B), DTE start position is "03", BRI setting is "2"
B "and an example of PRI signal formation when the BRI start position is" 08 ". The data terminal device signal SDTE mounted in the PRI signal is in time slots TS03 to TS06 (the time slot TS indicates the PRI signal. BRI signal SBRI is TS0.
8 to TS09.

The signal processing unit 12 sends a PR from the partner terminal device.
The data terminal device rate, D, which is set in the configuration information holding unit 15 from the PRI signal received via the I dedicated line 9
The data terminal signal SDTE and the BRI signal SBRI are extracted based on the TE start position, the BRI setting, and the BRI start position, and the data terminal device signal SDTE is sent from the terminal interface unit 11 to the data terminal device 31.
The BRI is transferred from the BRI interface unit 16 to the data terminal 3
Send to 2.

When the dedicated line mode is set in the configuration information holding unit 15, the BRI interface unit 16 functions as the dedicated line mode.

Further, the signal processing unit 12 sends a day terminal signal SDTE sent from the data terminal device 31 via the terminal interface unit 11 and a B terminal sent from the data terminal device 32 via the BRI interface unit 16.
The RI signal SBRI is set in the configuration information holding unit 15, the data terminal device rate, the DTE start position, and the BRI.
Based on the setting and the BRI head position, a PRI signal mounted in a predetermined time slot is formed and sent from the PRI interface unit 13 to the other party via the PRI dedicated line 9.

Referring to FIG. 8, the data terminal device rate is 5
12 kbit / s (8B), DTE start position is "0"
6 ", BRI setting is" 2B ", BRI start position is" 0 "
An example of signal formation in the case of 1 "will be described. (Normally, the transmission / reception configuration information is the same, but they are different for description.) The data terminal device signal SDTE is multiplexed in the time slots TS06 to TS13 of the PRI signal. BRI signal SBR
I is a time slot TS01 to TS02 of the PRI signal
Are multiplexed into.

By the above operation, when the terminal adapter is used as the leased line mode, that is, the PRI leased line terminating device, it is possible to effectively use the wasted BRI port.

However, in the following cases, these lines cannot be concentrated and cross-connected.

Referring to FIG. 9, the data terminal device rate is 1
472 kbit / s (23B), DTE start position is "0"
1 ", BRI setting is" 2B ", BRI start position is" 2 "
An example of signal formation in the case of 3 "will be described. The data terminal device signal SDTE is the time slots TS01 to PRI of the PRI signal.
The BRI signal SBRI is multiplexed on the TS23 and is multiplexed on the time slots TS23 to TS24 of the PRI signal. In this case, signals overlap in the time slot TS23. Therefore, when the sum of the data terminal device rate and the BRI setting exceeds 24B, the present invention cannot be implemented.

With reference to FIG. 10, an example of signal formation when the data terminal device rate is 1024 kbit / s (16B), the DTE start position is "12", the BRI setting is "2B", and the BRI start position is "01" explain. The data terminal device signal SDTE is the time slot TS1 of the PRI signal.
2 to TS27, the BRI signal SBRI is PR
The time slots TS25 to TS27 are multiplexed in the time slots TS01 to TS02 of the I signal. In this case, the PRI signal is limited to the time slot TS24.
The signal assigned to will disappear. Therefore, the total of the data terminal equipment rate and the BRI setting is 24.
Even if B is not exceeded, such a setting cannot be made. In this case, the DTE start position is "0" before "09".
Normal communication can be performed by resetting after 3 ".

In the above description, the terminal interface unit 1
Although the example in which 1 and the data terminal devices 3 and 31 are connected by the terminal interface 5 has been described, the terminal interface unit 11 is connected to the router via the terminal interface,
A plurality of data terminal devices 31 can be connected to the router via a LAN line. Similarly,
Instead of connecting the BRI interface unit 16 and the data terminal device 32 with the BRI interface 82, the BRI interface unit 16 is connected to a data circuit terminating device (DCE) via a BRI line, and the data line terminating device is connected. Data terminal device 32 via terminal interface
Can be configured to connect

[0039]

As described above, according to the present invention,
In a device that shares a PRI circuit switching and BRI circuit switching device (circuit switching mode) and a PRI leased line terminating device (dedicated line mode), when a BRI that is not used in the prior art is used as a PRI leased line terminating device, Port
Although there are restrictions on the settings, it can be used effectively.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an outline of a circuit switching mode using a terminal adapter according to the present invention.

FIG. 2 is a diagram illustrating an outline of a leased line mode using a terminal adapter according to the present invention.

FIG. 3 is a block diagram illustrating an outline of a configuration of a terminal adapter.

FIG. 4 is a block diagram illustrating an outline of a configuration of a BRI interface unit.

FIG. 5 is a diagram for explaining a signal flow in a circuit switching mode.

FIG. 6 is a diagram for explaining a signal flow in a dedicated line mode.

FIG. 7 is a diagram for explaining a mounting position (time slot allocation) of a PRI signal (first mode).

FIG. 8 is a diagram for explaining a mounting position (time slot allocation) of a PRI signal (second mode).

FIG. 9 is a diagram (third aspect) illustrating a mounting position (time slot allocation) of a PRI signal.

FIG. 10 is a diagram (fourth aspect) illustrating a mounting position (time slot allocation) of a PRI signal.

[Explanation of symbols]

1 terminal adapter 11 Terminal interface section 12 Signal processing unit 13 PRI interface section 14 Control unit 15 Configuration information holding unit 16 BRI interface section 161 physical interface 162 circuit switching mode control unit 163 Dedicated line mode controller 164 changeover switch 18 control bus 3 Data terminal equipment 5 Terminal interface 7 PRI line network 71 PRI line 8 BRI line network 81 BRI line 82 BRI interface 9 PRI dedicated line

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Saura             Fukushima Prefecture, Koriyama City, Senba 94, Japan             Within Tate Telecom Technology F term (reference) 5K030 HA01 HC05 JA03 KA14                 5K101 KK20 LL03 MM04 QQ12 SS01

Claims (2)

[Claims] 1. A line comprising a terminal interface section, a primary group interface section and a basic interface section, the primary group interface section being connected to a primary group interface circuit switching network, and the basic interface section being connected to the basic interface network. Exchange mode and primary group interface unit is 1
In a terminal adapter that can be used in both a circuit switching mode and a dedicated line mode, which can be shared by both the dedicated line mode and the dedicated line mode connected to the next-group interface dedicated line, a signal is transmitted between the terminal interface unit and the primary group interface unit. And a signal processing unit that selectively transmits and receives signals between the basic interface unit and the terminal interface unit or the primary group interface unit, and is mounted in the time slot of the PRI signal that passes through the primary group interface unit. A configuration information holding unit for holding data position information is provided, and the signal processing unit divides the signal from the terminal interface unit into a primary group interface unit and a basic interface unit in the line connection mode, and the primary group interface unit And the signals from the basic interface section are collected in the terminal interface section, and the dedicated line In modal, 1 the signal from the signal and the basic interface unit from the terminal interface unit
A terminal adapter that can be used in a circuit switching mode or a leased line mode, characterized in that signals from the primary group interface section are collected in a secondary group interface section and divided into a terminal interface section and a basic interface section. 2. The circuit switching mode according to claim 1, wherein the signal division or signal aggregation performed by the signal processing unit is performed based on position information of data held in the configuration information holding unit. Terminal adapter that can be used in a dedicated line mode