JP3462966B2 - Subscriber line transmission device, communication network using the same, and communication network test method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a transmission device suitable for a network system provided with a high-speed digital leased line, a structure of the network system, and a test method thereof.

[0002]

2. Description of the Related Art In the conventional network configuration, I.T. of the International Telecommunication Union (ITU-T) is recommended. In addition to the ISDN communication service having the interface defined by 430, a dedicated line communication service using a dedicated line is provided. As a network that provides a specific leased line communication service, the high-speed digital leased line system described on pages 24 and 25 of the October 1993 issue of NTT Technical Journal is representative. In this system, a DSU installed in a user's house and a subscriber line transmission device installed in a station building are connected by a digital line such as a metallic line or an optical fiber, and these subscriber line transmission devices are further digitalized at high speed. A dedicated line network is constructed so as to be connected via a dedicated line node device (hereinafter referred to as CNE) via a line, and this CNE is used for connection such as line editing of the entire transmission line including subscriber line transmission device and DSU. By controlling the DS
DS by connecting the transmission line between U as a dedicated line (fixed)
It provides private line service between U. Also, D
It provides communication services by occupying transmission equipment between SUs, so that various monitoring, maintenance, and testing functions and equipment are centralized in the CNE so that users can use the equipment and services with peace of mind 24 hours a day. It provides a highly reliable communication service by performing a comprehensive management.

[0003]

Initially, the above-mentioned high-speed digital leased line communication service was introduced in large cities with high traffic and large needs for leased line services, or between large cities. In this case, if the configuration of the communication network is such that the CNE is provided and a large number of lines are accommodated for centralized control, a large number of lines can be centrally managed, and a uniform high-quality communication service can be provided. Yes, and
Maintenance costs are low. In addition, even if a CNE equipped with various functions is introduced into a communication network, the number of dedicated line subscribers per CNE is large, so that the cost burden of the CNE seen from the subscribers is reduced. It is advantageous in terms of total cost including maintenance cost.

However, the development of digital communication networks has progressed as in recent years, and the needs for high-speed digital leased line services are increasing even in areas where the traffic is low compared to conventional large cities (where subscribers are not concentrated). In the configuration in which the network is centrally managed by using the CNE as described above, the merit of the centralized management by the CNE becomes smaller than the conventional one because the network becomes a small scale. Also, C per subscriber
The percentage of NE costs increases, which is disadvantageous in terms of overall costs.

That is, even in an area where the traffic is lower (concentration of subscribers) than that in a conventional large city, a high-speed digital leased line service is provided at a cost equal to or lower than that in the conventional large city service. Realization of transmission equipment and communication networks using it, and management (monitoring / maintenance / testing) to provide the same level of reliability as conventional services
A method is required.

The present invention has been made for the purpose of solving the above-mentioned problems, and simplifies the network configuration itself without using CNE, and at the same time, a subscriber line transmission apparatus to which a large number of DSU terminals are connected is also provided. To provide a transmission device that simplifies and can provide a leased line service at a low price with an optimal configuration for a small-scale network, and to configure a communication network using this transmission device. With the goal.

[0007] Further, even if the structure of the transmission device and the communication network is simplified, a management function capable of providing a highly reliable leased line communication service, specifically, a line editing / connection function,
Transmission equipment with monitoring, maintenance, and testing functions, and
It is an object of the present invention to provide a communication network using this transmission device and a method for operating these devices and the communication network.

More specifically, the present invention provides each transmission device with a line editing / connection function so that a dedicated line communication service can be provided even in a communication network composed only of subscriber line transmission devices. To provide a transmission device having a monitoring / maintenance / testing function and a control function for controlling them in a simple configuration, and to provide a communication network using these transmission devices in a simple configuration. And

Further, the present invention provides a connection control method and a monitoring / maintenance / testing method having a simple structure so that a leased line communication service can be provided even in a communication network composed only of subscriber line transmission devices. It is intended to be provided by the procedure.

Further, even in an area where the number of subscribers is small and the service providing area is wide, it is possible to provide a leased line service with excellent reliability at a low price by a simple operation, and the functions and loads are distributed. To provide a transmission device having the above configuration and a communication network using the same with a simple configuration, and
It is an object of the present invention to provide connection control and monitoring / maintenance / test of the transmission devices and the communication network by a simple procedure.

Furthermore, a transmission device having a configuration in which functions and loads are distributed and a communication network using the transmission device can be easily provided with control signals between the transmission devices so as to be used for providing a leased line communication service with a simple configuration and a simple procedure. It provides a new signal for sending and receiving to and from the device, and provides a transmission device equipped with a circuit that generates / transmits, receives / analyzes these signals with a simple configuration and procedure, and has high reliability. It is also an object of the present invention to build a communication network that provides a leased line service.

[0012]

In order to solve the above-mentioned problems, a transmission apparatus of the present invention multiplexes information from a plurality of channels into a multiplex transmission path, and multiplex transmission path information into a plurality of channels. A setting means for designating a test type of a communication network composed of a plurality of transmission devices and a connection of a channel to a transmission device having a demultiplexing circuit for separation, and a test control signal is generated and output based on information from the setting device. And a test control signal analyzing means for receiving and analyzing the test control signal, and the demultiplexing circuit includes a loop connection of channels designated based on the test control signal or connection between channels and a test signal. The transmission device has a connection control circuit for inserting and removing.

Further, the folded connection of the above channel is
The configuration is such that either the return connection in the transmission device or the return connection in an external device such as a terminal connected to the channel of the transmission device is selected.

Further, the communication network has a structure in which a plurality of stations each having the above-mentioned transmission device are connected by a multiplex transmission line. Then, when a test type is set in a transmission device installed in an arbitrary station among a plurality of stations, a test control signal is transmitted to the transmission device of the counter station to be tested via the multiplex transmission path, and both transmission devices are transmitted. In this configuration, the communication network and each transmission device are tested by controlling the channel of the demultiplexing circuit in a connection state in which the specified test can be executed.

Specifically, a communication path from a transmission device of a station that designates an arbitrary test to a channel of a demultiplexing circuit of a transmission device under test and a demultiplexing circuit of a transmission device under test or an external device such as a terminal connected to the corresponding channel. A loopback connection was used to test the normality of the communication network and transmission equipment. Furthermore, even if the channel of the device under test is already connected and in use, the connection control circuit of the demultiplexing circuit of the transmission device changes the route setting in order to confirm the normality of the route from the station to which the test is set. It also has functions and procedures that enable testing while protecting the channel in use.

The test control signal of the present invention uses an overhead bit included in a transmission frame transmitted and received on a multiplex transmission line, and encodes a test type and a test target channel into an overhead bit string obtained by the multiframe to transmit the transmission device. It is configured to send and receive between. That is, the test control signal generation means and the test control signal analysis means of the transmission device control the circuit for generating and transmitting a multi-frame code based on the setting of the setting means and the connection control circuit for receiving the code. It is composed of a circuit for converting into a signal.

Further, in the demultiplexing circuit of the transmission apparatus of the present invention, a through circuit for passing a signal can be installed, and the connection control circuit and the through circuit are controlled and transmitted based on the instruction of the setting means. The configuration is such that it is possible to edit the connection between the channels within the device and the connection between the channels between the transmission devices.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a transmission device and a communication network using the same according to the present invention, and an embodiment of an operation (monitoring / maintenance / test) method of the transmission device and the communication network will be described in detail with reference to the drawings. Explained.

First, the configuration of the transmission device and the configuration of the communication network will be described. FIG. 1 is a network configuration diagram showing a configuration of a communication network using the transmission device of the present invention. In the present invention, each DSU is an interface with a subscriber (eg,
The manned C station (1), the unmanned A station (2) and the unmanned B station (3) accommodating 4, 6-9) are relay transmission lines (500, 50).
A communication network was constructed by connecting in 1). Manned C station (1)
The subscriber line transmission device C1 (1
0) and a subscriber line transmission device C2 (20) were installed. In addition, the unmanned station A (2) is connected to the subscriber line transmission device A according to the present invention.
(30) The subscriber line transmission device B (40) according to the present invention is also installed in the unmanned B station (3). That is, in contrast to the conventional leased line service providing network in which connection control is performed centering on the CNE, the leased line service providing network according to the present invention has the subscriber line transmission device according to the present invention arranged in each station to provide functions and functions. It is configured to share the load and execute connection control and management (monitoring, maintenance, and testing).

Specifically, each subscriber line transmission device of each station uses a subscriber line (for example, 101 to 104, 300 to 30).
Each DSU is accommodated via 3). Then, in order to connect the stations of the unmanned A station (2), the unmanned B station (3) and the manned C station (3) to each other, the multi-end station devices A, B, C1,
C2 (50 to 53) is provided, and the relay transmission line (500, 50
In the configuration 1), the communication network is connected to provide a high-speed digital leased line service.

FIG. 2 is a block configuration diagram for explaining the network configuration of FIG. 1 in more detail, and is a diagram showing in more detail the configuration of the subscriber line transmission device according to the present invention provided in each station.
In the figure, the relay transmission lines (500, 50
1) is displayed as a relay transmission network (60, 61) and the connection of each subscriber line transmission device between each station is shown. Below,
The configuration of the subscriber line transmission device of the present invention will be described with reference to FIG. 1 by taking the subscriber line transmission device C1 (10) as an example. As described above, the subscriber line transmission devices installed in other stations also have the same configuration.

The subscriber line transmission device has a function of interfacing with a relay network, and performs HW unit (11) for terminating the relay line, setting a plurality of lines, demultiplexing, etc., and monitoring / maintenance of the entire device. A supervisory control unit (12) for controlling the test function,
It is composed of a line unit (13) which is an interface with a DSU or the like. In the present embodiment, the line section (13) has a DS
In addition to accommodating U7 in CH # 1 (14), THRO (17) having a through function for connecting to another subscriber line transmission device C2 (20) is accommodated.

The configuration of each block of the above-mentioned subscriber line transmission device will be described below in more detail with reference to the drawings. FIG. 3 is a block configuration diagram showing a configuration of a supervisory control unit provided in a subscriber line transmission device (hereinafter, may be simply referred to as a transmission device) of the present invention. The transmission device C1 (10) installed in the manned station C (1) will be described as an example. The monitoring control unit (12) includes a line unit (13) and an HW unit (1).
It is connected to 1) and generates and analyzes commands for connection control and monitoring / maintenance / test control. Setting unit for connection and monitoring / maintenance / test control commands (setting switch and this setting is converted into commands and sent / received). Part) and an interface with the test equipment. The line unit (13) and the HW unit (11) create and set signals required for connection and management in accordance with instructions from the supervisory control unit (12).

Specifically, as a switch (hereinafter sometimes abbreviated as SW) for setting a loop test or the like, a test CH setting SW (1200) and a local / opposite station selection SW
(1201), LPO / LP2 selection SW (1202) and test execution SW (1203). Test CH setting S
W (1200) is C accommodated in the line part of the present invention
Used to specify H. Own / opposite station selection SW (1
201) is for the selection of the loop test (own station) of the present invention installed in the manned C station (1) and the loop test (opposite station) of the present invention installed in the unmanned A station (2). use. The LPO / LP2 selection SW (1202) is used for selection of a loop test (LPO) in the line section in the device and a loop test (LP2) in the DSU connected to the present invention. The test execution SW (1203) is
Used to select whether or not to perform loop test.

As the tester connection interface, a test data input / output port (1204) for connecting the tester and the transmission device, and test data for converting the test data from the tester into the in-device interface of the present invention. Converter (1
205) and a test data transmitting / receiving unit (1209) which is an interface unit with the HW unit.

The supervisory control unit (12) uses the CH data (1210) and the station data (121) set by the above SWs.
Based on 1), loop position data (1212) and test execution data (1213), the test type recognition unit (1206) generates test control data to be transmitted to each block of the transmission device. The data generated by the test type recognition unit (1206) is the line unit data (1218) corresponding to each block.
Alternatively, as the data for the HW unit (1219), the data is transmitted through the test type command transmitting unit (for the line unit) (1207) or the test type command transmitting / receiving unit (for the HW unit) (1208) which is an interface with each block. Transmission / reception with blocks, connection control, monitoring / maintenance /
Test control will be performed.

FIG. 4 is a block diagram showing the configuration of the HW unit of the transmission device of the present invention. The HW unit (11) is provided with an interface function between the relay network and the line unit and performs termination processing of the relay line, setting of a plurality of lines and demultiplexing.

First, the part for processing the main signal will be described. The test type terminating unit (1102) receives a signal from the multiplex terminal equipment interface (100) on the relay network side, and the F bit included in the signal frame. (Detailed configuration is
It will be described later with reference to FIG. ), Which also has a function of recognizing the test (loop test) type of the transmission device and the communication network according to the present invention.
The main signal data (1115) output from 102) is CH-separated by the reception signal separation unit (1103) and sent to the line unit. As a transmission signal to the trunk line in the reverse direction, a CH signal of the line section received from the HW interface (110) on the line section (13) side is a transmission signal multiplexing section (1107).
After the F bit is added in the multi-frame generation unit (1106) that multiplexes with the F-bit and generates an F-bit multi-frame (information such as a loop test as described later is entered here),
It is output from the multiplex terminal equipment interface (100) to the trunk network.

A route setting section for changing and setting the route of the corresponding test CH for inserting and extracting test data in order to carry out a dedicated line test (a continuity confirmation test such as a loop test) in the transmission device or communication network. (1104, 1108) and a test data insertion / extraction unit (1105, 1109) for inserting and extracting the test data from the tester are provided, and these are activated. Specifically, it is performed by receiving the test type data (1221) from the monitor control unit (12) and controlling by the test type command transmission / reception unit (for HW unit) (1100). In addition, the test type command transmitting / receiving unit (for HW unit) (110
0) also has a function of receiving the test type data (1111) from the test type terminating unit (1102) and transmitting it to the monitoring control unit (12). Test data transceiver (110
1) is a test data insertion / extraction unit (1105, 110).
9) transmission data (1114) to the test data insertion / extraction unit (1105, 1109) reception data (111)
3) is an interface for transmitting and receiving to and from the monitoring control unit (12).

FIG. 5 is a block diagram showing the configuration of the CH section of the transmission device of the present invention. In the following, CH # 1 (1
The configuration will be described by taking 4) as an example. This CH section (14)
DSU that accommodates the subscriber of the leased line service
Communication is performed by converting the signal format from the SU into the signal format in the transmission device.

HW interface conversion unit (1404)
Receives the signal received from the HW unit (11) from the internal signal (14
05). The DSU interface unit (1402) that has received the in-device signal (1405)
U), a loop route setting of LPO and a loop activation of LP2 which are two types of loop test instructions for performing a test of the transmission device and the communication network (continuity test by a loop test) in addition to converting the signal to be transmitted to Generate an instruction (details will be described later with reference to the drawings in the operation description). The activation of the LPO and LP2 is performed by the test type command receiving unit (for the line unit) that receives the information from the monitoring control unit (12).
(1401) controls. Also, the interface conversion for transmitting the main signal from the DSU to the HW unit is H
The W unit interface generation unit (1403). Further, the present CH unit (14) has an adjacent loopback function as a function of connecting DSUs connected to the transmission device or communication network of the present invention to each other, and the connection is set by the adjacent loopback execution SW (1400). It is a composition.

FIG. 6 shows a THR provided in the transmission apparatus of the present invention.
It is a block configuration diagram showing a configuration of an O section. In the following, T
The configuration will be described by taking the HRO (17) as an example. Book THRO
The section is to realize the circuit editing function, which was centrally managed by the CNE in the conventional leased line network, by distributing and arranging it in the transmission device according to the present invention. Run only on hardware.

Specifically, the HW interface conversion section (1702) converts the received signal from the HW section into a device internal signal (1
704). The THRO interface transmission unit (1703) that receives the in-device signal (1704) is installed in the line unit (14) of another transmission device of the present invention.
Perform intra-station interface conversion to connect to HRO. In the reverse direction, the THRO interface receiving section (1701) and the HW section interface generating section (170
0) performs the reverse conversion of the above conversion. Then, the line editing function is realized by connecting the THRO units between the transmission devices with each other through the transmission line 104.

In the following, the operation of the transmission device and the communication network of the present invention, and the management of the transmission device and the communication network (monitoring, maintenance,
The test method will be described in detail with reference to the drawings. First, a connection for providing a normal leased line service will be described. This realizes a leased line service between users by connecting DSUs installed in users via the transmission device of the present invention installed in each station.

As an example of connection, in the configuration of the transmission device and the communication network shown in FIG. 2, the DSU of the unmanned A station (2) is used.
A configuration for connecting (4) and the DSU (7) of the manned C station (1) will be described. The DSU (4) transmits the subscriber line transmission device of the unmanned A station (2) via the subscriber line (300). It is connected to CH # 1 (34) of the line section (33) of A (30) and is multiplexed by the HW section (31) through the HW interface (310), and the multiplexing end of the subscriber line transmission device A (30). It is transmitted to the manned C station (1) through the relay transmission network (60) through the station device interface (305) and the HW of the subscriber line transmission device C1 (10) through the multi-end station device interface (100). CH of the line section (13) separated by the section (11) and through the HW interface (110)
# 1 (14) connected to D via subscriber line (101)
By connecting to the SU (7), the leased line service is provided between the user having the DSU (4) and the user having the DSU (7).

Next, regarding the line editing function by the transmission apparatus of the present invention, the D of the unattended station A (2) is also referred to using FIG.
The connection between the SU (5) and the DSU (6) of the unmanned B station (3) (interconnection between unmanned stations) will be described as an example. In order to perform the main line editing, in the transmission device and the communication network of the present invention, in the line parts of the subscriber line transmission device C1 (10) and the subscriber line transmission device C2 (20) of the manned C station (1), T described in FIG.
The HROs (17, 24) are respectively inserted, and the THROs are connected to each other by the intra-office interface (104).

The signal flow will be described. DSU
(5) is CH # 12 of the line section (33) of the subscriber line transmission device A (30) of the unmanned station A (2) via the subscriber line 301.
(35) and is multiplexed by the HW unit (31) via the HW interface (310) to obtain the subscriber line transmission device A.
It is transmitted to the manned C station (1) through the multiplex terminal device interface (305) of (30) and the relay transmission network (60). The signal received by the manned C station (1) is transmitted to the subscriber line transmission device C1 via the multiplex terminal device interface (100).
It is separated by the HW unit (11) of (10), and THRO (1 of the line unit (13) is passed through the HW interface (110).
7) and is transmitted to the THRO (24) of the line section (23) of the subscriber line transmission device C2 (20) through the intra-office interface (104). Subscriber line transmission device C2
In (20), the signals are multiplexed in the HW unit (21) via the HW interface (210), and the subscriber line transmission device C
2 (20) to the unmanned B station (3) via the multiplex terminal equipment interface (200) and the relay transmission network (61). The signal received by the unmanned B station (3) is transmitted to the subscriber line transmission device B via the multiplex terminal device interface (401).
CH # 12 of the line section (43) separated by the HW section (41) of (40) and via the HW interface (410)
DSU via subscriber line (400) connected to (44)
It is transmitted to (6). With the above connection, DS
A line is set up between the user having U (5) and the user having DSU (6) to provide the leased line service.

Furthermore, regarding another embodiment of the line editing function by the transmission device of the present invention, the DSU (8) and the DSU (9) connection (adjacent loopback connection) in the manned station C (1) are also used with reference to FIG. ) As an example. In order to edit this line, the manned station C is used in the transmission device and communication network of the present invention.
In (1), CH # 3 (15) and CH # 4 (16) to which the DSU is connected need to be set to adjacent loopback.
Specifically, the adjacent turnaround execution SW (140
It is executed by setting 0) to “execution”. Note that this adjacent return connects data of adjacent CHs to each other, and CH1 to CH2, CH3 to CH4, and CH5 to C are connected.
The transmission device is configured so that it can be replaced with H6.

The operation of the adjacent loopback function provided in this transmission apparatus will be described below with reference to FIGS. 4 and 5. T shown in FIG.
By setting the adjacent return execution SW (1400) provided in the HRO to “execute”, the adjacent return execution data (1120) is transmitted to the HW unit (11), and the route setting unit in the HW unit shown in FIG. (1108) receives this data. Here, the route setting unit (1108) uses CH # 3.
The route of the main signal is set so that the transmission data (1119) from (15) becomes the reception data (1118) of CH # 4 (16) using the adjacent return route (1124). Similarly, the route is changed so that the transmission data from CH # 4 (16) becomes the reception data of CH # 3 (15). With the above operation, the transmission devices of the present invention and the DSUs accommodated in the communication network can be connected to each other.

In the following, a management (monitoring / maintenance / test) function, particularly a test function, executed for the purpose of providing a highly reliable leased line service in a transmission device according to the present invention and a communication network using the same will be described. Will be described in detail.

Prior to the description of the test function, the structure of the test control signal used in the transmission device and the communication network of the present invention will be described. This signal is generated and transmitted by the transmission apparatus of the present invention, and received and analyzed, so that the transmission apparatus of the present invention operates for a test, and even if the conventional CNE is not used, the test function and the load are distributed. The continuity test of the communication network is executed, and a highly reliable leased line service can be provided. That is, it is possible to provide a leased line service by a highly reliable communication network only by connecting the transmission devices of the present invention to each other and transmitting and receiving the test control signal according to the present invention between the transmission devices.

FIG. 7 is a format diagram showing a frame structure of a signal handled by the transmission apparatus of the present invention. 8 and 9 are function explanatory diagrams for explaining the function (meaning of the signal) of the D bit which is the F bit signal sequence obtained from the multi-frame of the signal. In this embodiment, the transmission device is 64 kbp.
24CH for s's (12CH for ISDN BRI)
Since it is a device for accommodating and performing demultiplexing processing, a transmission rate of 1.54, which is obtained by multiplexing a signal of 24CH and F bit (2001)
A 4 MHz frame (2000) is used. This F bit (2001) constitutes a frame synchronization bit (2002) when 24 multiframes are configured as shown in FIG.
And a CRC calculation result (2003) used for error detection and a D bit (2004).

In the present invention, the D-bit (2004) defines the test control signal transmitted and received between the transmission devices, and the test control is performed by transmitting and receiving between the transmission devices. Specifically, the test contents (two types of loop control LP0 to be described later) with MF1 and MF3 as shown in FIG.
And LP2) and the CHs to be tested by MF5, 7, 11, 13 are notified. In addition, MF15, 17,
Reference numerals 19, 21, and 23 are frame bits used for synchronization of this multiframe. And the notification of the CH number is
As shown in FIG. 9, since the CH number is designated in the BRI unit of ISDN, it is configured to specify CH1 to CH12.

The supervisory control unit (12) and THR of each transmission device
When the SW provided in O (14) is set to a test state in which it is intended to be executed in the communication network, the transmission device on the test side generates the test control signal shown in FIGS. Send to test transmitter. The transmission device under test is configured to analyze the received test control signal and control the DSU accommodated in the HW unit (11), the line unit (13) and the transmission device to execute the continuity test. The control of each transmission device described above is mainly performed by the supervisory control unit (12) of each transmission device. This allows CNE to operate like a conventional leased line network.
Even if there is not, since the test of the communication network can be executed by sharing the test function and the load only by the transmission device of the present invention, it is possible to provide the leased line service with excellent reliability.

Next, the structure and method of the continuity test in the transmission device and the communication network of the present invention will be described. First, loop back at the CH section of the transmission device of the opposite station (OCULOO
An example of the LPO test in which P) is formed and the continuity test is performed will be described. FIG. 10 is an operation explanatory diagram for explaining the outline and procedure of the LPO test with the opposite station. The subscriber line transmission device C1 (1) of the manned C station (1) of the communication network shown in FIG.
0) DSU (7) and unmanned station A (2)
DSU accommodated in the subscriber line transmission device A (30) of
In the connection of (4), an LPO test is shown in which the line CH # 1 (34) of the subscriber line transmission device A (30) of the unmanned A station (2) is looped back and tested. Below, FIG.
This will be described in detail with reference to FIGS. 5 and 10. In the following description, since FIG. 3, FIG. 4 and FIG. 5 are used, the reference number of the block of the device configuration of the subscriber line transmission device A (30) in the unmanned A station (2) is used as the subscriber line. A description will be given by changing the head of the reference numbers of the blocks of the device configuration of the transmission device C1 (10) from 1 to 3. For example, the test type recognition unit of the subscriber line transmission device A (30) is described by changing 1206 to 3206.

(1) Connection of tester: The tester (70) is connected to the test data input / output port (1204) of the supervisory control unit (12) of the subscriber line transmission device C1 (10) of the manned C station (1). Connecting.

(2) Loop test type setting: Set the test CH setting SW (1200) of the monitoring control unit (12) to "CH
1 ”, own station / opposite station selection SW (1201) is“ opposite station ”, LPO / LP2 selection SW (1202) is“ LP
“O” and the test execution SW (1203) are set to “execution”.

(3) Recognition of test contents (monitoring control section):
The setting data in (2) is used as the test type recognition unit (120
6) recognizes.

(4) Output of test contents (monitoring control unit): H
Data for W section (1219) is created, and is output to the HW section (11) as test type data (1221) via the test type command transmission / reception section (for HW section) (1208).

(5) Recognition of test contents (HW section): The test type command transmission / reception section (for HW section) (1100) which received the test type data (1221) converts the multiframe data (1110) into the multiframe generation section. To (1106),
The setting data (1112) is transmitted to the test data insertion / extraction unit (1105) (1109) for carrying out the loop test.

(6) Transmission side setting: The multi-frame generator (1106) uses the multi-frame data (1110) shown in FIGS.
A frame in which information is inserted into D bit in 0) is generated, and the test data insertion / extraction unit (1105) sets data extraction and the test data insertion / extraction unit (1109) sets data insertion.

(7) Test data generation (monitoring control section): The test data (1214) from the tester (70) is received by the HW section (11) so that the test data conversion section (120) can receive it.
5) The speed-converted test data (12)
16) passes through the test data transmission / reception unit (1209) and becomes transmission test data (1223) which is output from the monitoring control unit (12).

(8) Test data insertion (HW section): The transmission test data (1223) received by the test data transmission / reception section (1101) of the HW section (11) is the transmission test data (1
114), the CH of the unattended station A (2) in the test data insertion / extraction unit (1109) that became the insertion side in (5).
It is taken in for # 1 (34) and transmitted to the counter station (unmanned A station (2)). The F-bit of the signal at this time has a multi-frame pattern (MF1, 3, 5, 7,
9, 11, 13, 15, 17, 17, 21, 23) =
(1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1)
Then, it is transmitted so as to notify the opposite station that it is the CH # 1 LPO test.

(9) Termination of transmission signal: The signal is terminated at the test type termination section (3102) of the HW section (31) of the unmanned station A (2), the test information is recognized, and the test information (3111) is output. To do.

(10) Output of test content (HW section): The test information (3111) is sent to the monitor control section (32) via the test type command transmission / reception section (for HW section) (3100) and the test type data (3100). 3222) is output. (11) Reception of test contents (monitoring control unit): The test type data (3222) is received via the test type command transmitting / receiving unit (for HW unit) (3208), and the monitoring control unit data (3
220) is input to the test type recognition unit (3206).

(12) Recognition of test contents: The test type recognition unit (3206) receives the monitor control unit data (3220),
The line type data (3218) is output to recognize the test type and cause the CH # 1 (34) to recognize the LPO test.

(13) Output of control signal (monitoring control section):
The test type command transmitting unit (for line unit) (3207) receives the data for line unit (3218), and the line control information (32)
1) is output.

(14) Line loop setting / data loopback: CH # 1 (3) that received the line control information (321)
4) is an unmanned station O in the DSU interface unit (3402)
Set CULOOP (340) and loop back the test data.

(15) Reception of loopback test data: The loopback data is returned to the subscriber line transmission device C1 (10), and the data is sampled and received by the test data insertion / extraction unit (1105) set in (6). It is output as test data (1113).

(16) Return test data output (HW section):
The received test data (1223) passes through the test data transmission / reception unit (1101) and is transmitted to the monitoring control unit (12).

(17) Loopback test data output (monitoring control unit): The test data conversion unit (1205) performs speed conversion through the test data transmission / reception unit (1209) and becomes test data (1215), which is the test data input / output. Mouth (1204)
Is output to the tester (70) to start the test.

Next, the DS accommodated in the transmission device of the opposite station
An example of the LP2 test in which a loop (DSULOOP) is formed by folding back at U and a continuity test is performed will be described. FIG. 11 is an operation explanatory diagram for explaining the outline and procedure of the LP2 test with the opposite station, and is accommodated in the subscriber line transmission device C1 (10) of the manned C station (1) of the communication network shown in FIG. In connection of the DSU (7) and the DSU (4) accommodated in the subscriber line transmission device A (30) of the unmanned A station (2), the subscriber line transmission device A ( 30 shows the LP2 test in which the DSU (4) connected to the line section CH # 1 (34) of 30) performs the loopback test. Hereinafter, a detailed description will be given with reference to FIGS. 3 to 5 and 11.

(1) Connection of tester: LPO described above
It is the same as the test procedure (1).

(2) Setting of loop test type: Set the test CH setting SW (1200) of the monitoring controller (12) to "CH
1], own station / opposite station selection SW (1201) is “opposite station”, LPO / LP2 selection SW (1202) is “LP
2 ”, the test execution SW (1203) is set to“ execution ”.

(3) to (8) Manned station operation: Same as the procedures (3) to (8) of the LPO test described above. The F bit added to the signal transmitted in step (8) has a multi-frame pattern (MF1, 3, 5, 7, 9, 1).
1, 13, 15, 17, 19, 21, 23) = (0,
1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1), and is transmitted so as to notify the opposite station that it is the LP2 test of CH # 1.

(9)-(11) Operation of unmanned station: Same as the procedure (9)-(11) of the LPO test described above.

(12) Recognition of test contents: The test type recognition unit (3206) receives the monitor control unit data (3220), recognizes the test type, and determines the LP2 test as CH # 1 (34).
Then, the line section data (3218) is output for recognition.

(13) Output of control signal (monitoring control section):
This is the same as the procedure (13) of the LPO test described above.

(14) Line loop setting / data loopback CH # 1 (34) which received the line control information (321)
The DSU interface unit (3402) of the unmanned station DSULOO returns the test data to the DSU (4).
P (341) is set to control the DSU.

(15)-(17) Manned station operation: Same as the procedure (15)-(17) of the LPO test described above.

Furthermore, the transmission device of the present invention and another test method of a communication network using the same will be described. In this embodiment, in the transmission device of the unmanned station, in the state where the adjacent loopback connection described in the previous connection operation is made, the loopback test is performed on the CH section or the DSU connected from the manned station to the unmanned station. By doing this, the CH section and DSU are tested for normality and the normality of the transmission line from the manned station to the corresponding point in the unmanned station is tested.
Examples of an LPO test in which OP) is formed and a continuity test is performed and an LP2 test in which a loop (DSULOOP) is formed by folding back at DSU and a continuity test is performed will be described.

FIG. 12 is an operation explanatory view for explaining an outline and a procedure for executing the LPO test and the LP2 test which are carried out when the opposite station is in the loopback connection state.
Subscriber line transmission device A of unmanned station A (2) of the communication network shown in FIG.
DSU (18) and DSU housed in (30)
(19) and the adjacent loop-back connection state, the line section CH of the subscriber line transmission device A (30) of the unmanned A station (2) from the subscriber line transmission device C1 (10) of the manned C station (1). # 3
The operation when performing the LPO test for (36) or the LP2 test for DSU (18) is shown. Hereinafter, a detailed description will be given with reference to FIGS. 3 to 6 and FIG.

(1) Connection of tester: Same as the procedure (1) of the above two test examples.

(2) Loop test type setting The test CH setting SW (1200) of the monitor control unit (12) is "CH1", the own station / opposite station selection SW (1201) is "opposite station", and LPO / LP2 is selected. SW (1202) to "LP
Set “O” or “LP2” and the test execution SW (1203) to “execution”.

(3) to (7) Manned station operation: The same as steps (3) to (7) of the above two test examples.

(8) Test data insertion (HW section): The transmission test data (1223) received by the test data transmission / reception section (1101) of the HW section (11) is the transmission test data (1
114), the CH of the unattended station A (2) in the test data insertion / extraction unit (1109) that became the insertion side in (5).
It is taken in for # 3 (36) and transmitted to the counter station (unmanned A station (2)). The F bit of the signal at this time indicates that the multi-frame pattern is the CH # 3 LPO test or LP2 test (MF1, 3, 5,
7, 9, 11, 13, 15, 17, 19, 21, 23)
= (1,0,0,0,0,1,1,1,1,1,1,1,
0, 1) or MF 1, 3, 5, 7, 9, 11, 13,
15, 17, 19, 21, 23) = (0, 1, 0, 0,
0,1,1,1,1,1,1,0,1) and CH #
3 LPO or LP2 test sent to notify counter station.

(9) to (11) Unmanned station operation: The same as steps (9) to (11) of the above two test examples.

(12) Recognition of test contents: The test type recognition unit (3206) receives the monitor control unit data (3220),
Output line data (3218) to make CH # 3 (36) recognize the LPO test or LP2 test, and
Information for avoiding the adjacent return setting set by the route setting unit (3108) of the W unit (31) is output as HW unit data (3219).

(13) Output of control signal (monitoring control section):
The test type command transmission unit (for line unit) (3207) receives the data for line unit (3218), and uses the line unit control information (3).
21) is output. The test type command transmission unit (for HW unit) (3208) receives the HW unit data (3219) and outputs the HW unit control information (3221).

(14) Line loop setting / HW part avoidance route setting / Data loopback: The DSU interface unit (3402) of CH # 3 (36) that has received the line control information (321) is used for the LPO test. Unmanned station OCULO
Unattended station DSULO so that test data is set back at DSU (18) when setting OP (340) and LP2 test.
The control is performed so as to set OP (341). Also, H
The test type command transmitting / receiving unit (3100) of the HW unit (34) having received the W unit control information (3221), in order to avoid the current adjacent return route (3124), the route setting units (3104) and (3108). At the avoidance route (31
26) and (3125) are controlled.

(15)-(17) Manned station operation: The same as steps (15)-(17) of the above two test examples.

As shown in the above embodiment, in the transmission device of the present invention and the communication network using the same, the D bit of the multi-frame signal according to the present invention is defined as a test control signal and transmitted / received between the opposite devices. This makes it possible to perform remote loop tests of unmanned stations in various forms with a simple configuration and simple operation, and provides the same test function as that performed by the CNE equipped with the conventional leased line network, which is highly reliable. The leased line communication service will be provided.

[0083]

According to the present invention, a leased line network system can be configured without using any CNE used in a conventional leased line communication system, and the network maintenance / operation function has a loop test function. It will be equivalent to the conventional network, and line editing will be possible.
That is, it becomes possible to provide a leased line service that is low in cost and excellent in reliability.

[Brief description of drawings]

FIG. 1 is a network configuration diagram showing a configuration of a communication network using a transmission device of the present invention.

FIG. 2 is a block configuration diagram showing configurations of a transmission device and a communication network of the present invention.

FIG. 3 is a block configuration diagram showing a configuration of a supervisory control unit of the transmission device of the present invention.

FIG. 4 is a block configuration diagram similarly showing a configuration of a highway (HW) unit.

FIG. 5 is a block diagram showing a configuration of a channel (CH) unit accommodated in the line unit.

[FIG. 6] Similarly, a thru (THRO) accommodated in the line section
FIG. 3 is a block configuration diagram showing a configuration of a unit.

FIG. 7 is an explanatory diagram showing a frame configuration of a signal processed by the transmission device of the present invention.

FIG. 8 is also a diagram explaining the function of D bits of a multi-frame signal.

FIG. 9 is also a diagram explaining the function of the D bit.

FIG. 10 is an operation explanatory diagram illustrating an example of a configuration and a method of a continuity test of a communication network using the transmission device of the present invention.

FIG. 11 is an operation explanatory diagram explaining another example of the continuity test.

FIG. 12 is also an operation explanatory diagram explaining another example of the continuity test.

[Explanation of symbols]

1 ... Manned C station, 2 ... Unmanned A station,
3 ... Unmanned B station, 4-9 ... DSU, 10 ... Subscriber line transmission device C1, 11 ... HW section, 12 ... Monitoring control section, 13 ... Line section, 14 ~ 16 ... C
H, 17 ... THRO, 18-19 ... DSU, 2
0: subscriber line transmission device C2, 30 ... subscriber line transmission device A, 40: subscriber line transmission device B, 50 to 53 ...
・ Multiple terminal equipment, 60, 61 ... Relay transmission network, 1
01 to 104 ... Subscriber line, 104 ... Intra-station interface, 120, 121 ... Supervisory control signal, 3
11 ... Avoidance route, 340 ... OCULOOP,
341 ... DSULOOP, 1100 ... Test type command transmitting / receiving unit (for HW unit), 1101 ... Test data transmitting / receiving unit, 1102 ... Test type terminating unit, 1103 ... Received signal separating unit, 1104. ..Route setting section, 1
105, 1109 ... Test data insertion / extraction unit, 110
6 ... Multi-frame generation section, 1107 ... Transmission signal multiplexing section, 1108 ... Route setting section, 1201 ... Own / opposite station selection SW, 1202 ... LPO / LP2 selection S
W, 1203 ... Test execution SW, 1204 ...
Test data input / output port 1205 ... Test data conversion unit,
1206 ... Test type recognition unit, 1207 ... Test type command transmitting unit (for line unit), 1208 ... Test type command transmitting unit (for HW unit), 1209 ... Test data transmitting / receiving unit, 1400. ..Adjacent loopback execution SW, 1401 ... Test type command receiving unit (for line unit), 1402 ... DSU interface unit, 1403 ... HW unit interface generating unit, 1404 ... HW unit interface converting unit, 20
00 ... Signal frame, 2003 ... D bit.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eisuke Atsumi Eisuke Atsumi 94, Funaba, Koriyama City, Fukushima Prefecture, inside Nippon Telecom Technology Co., Ltd. (72) Inventor Takashi Shigeri 216 Totsuka-cho, Totsuka-ku, Yokohama, Kanagawa Company Hitachi, Ltd.Information and Communications Division (72) Inventor Takeo Okamura 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Company Hitachi Information and Communications Division (72) Inventor Kenichi Inoue 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Address Stock Company Hitachi, Ltd., Information and Communication Division (56) Reference JP-A-7-30510 (JP, A) JP-A-5-268187 (JP, A) JP-A-4-299624 (JP, A) JP Flat 2-104039 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04J 3/14 H04L 13/00

Claims (7)

(57) [Claims] 1. A multi-transmission line for channels from a plurality of subscribers.
And multiplex transmission line information to multiple subscribers
Demultiplexing circuit for separating channelsAnd connection control circuitTo
Subscriber line transmission equipment equippedAnd,The connection control circuit, Test type of communication network consisting of a plurality of subscriber line transmission devices
Setting means for specifying the connection of another channel or the above, Generates and outputs a test control signal based on the information of the setting means.
A test control signal generating means, Test control signal analysis means for receiving and analyzing the test control signal
When, Return of the channel specified based on the test control signal
Connection or channel-to-channel connection and test signal
Insert and removeConnection processing meansAnd
Incoming line transmission equipment. 2. A subscriber line transmission apparatus comprising a demultiplexing circuit for multiplexing channels from a plurality of subscribers into a multiplex transmission line and separating information of the multiplex transmission line into channels for a plurality of subscribers. the provided stations a communication network configuration of connecting a plurality multiplex transmission path, each of said subscriber line transmission apparatus, a setting unit that specifies the connection of the test type and the channel of the communication network, the setting Test control signal generating means for generating and outputting a test control signal based on information of means, test control signal analyzing means for receiving and analyzing the test control signal, and loop-back connection of channels specified based on the test control signal or between channels And a connection processing circuit for connecting and disconnecting the test signal, and a connection control circuit for the demultiplexing circuit, which is a subscriber transmission device. 3. The communication network according to claim 2, wherein when the subscriber line transmission device installed in an arbitrary station of the plurality of stations sets a test type by the setting means, the test target is opposed. A test control signal is transmitted to the subscriber line transmission device of the station via the multiplex transmission line, and the subscriber line transmission device of the counter station receives and analyzes the test control signal, and each subscriber A communication network for testing the above-mentioned communication network and each subscriber line transmission device by connecting the connection control circuit of the line transmission device to perform a test of the channel set by the demultiplexing circuit. 4. A subscriber line transmission apparatus comprising a demultiplexing circuit for multiplexing channels from a plurality of subscribers into a multiplex transmission line and separating information of the multiplex transmission line into channels for a plurality of subscribers. A test method for a communication network configured to connect multiple stations equipped with multiplex transmission lines, in which the subscriber line transmission equipment of the station that specifies the test sets the test type.
And generates transmit a test control signal, the subscriber line transmission system of the designated station receives analyzes the test control signal, corresponding to the test type is set to connect each subscriber line transmission apparatus connected set, the test station to be designated subscriber line transmission device analyzes transmit and receive a test signal, the subscriber stations said designated station subscriber line transmission apparatus to specify the test the test signal this sent back to the line transmission equipment
The method of testing a communication network, characterized in that it comprises and. 5.The test method according to claim 4, The test of the above communication network is the subscriber line of the station that specifies the above test.
Transmission equipment, multiplex transmission lines, and subscriber line transmissions of the stations specified above
The channel of the demultiplexing circuit of the transmitter or the channel
Loopback connection of the communication path to the terminal connected to the channel
Then, the continuity between the communication network and the subscriber line transmission device is tested.
A test method characterized by the following. 6. A subscriber line transmission apparatus comprising a demultiplexing circuit for multiplexing channels from a plurality of subscribers into a multiplex transmission line and separating information on the multiplex transmission line into channels for a plurality of subscribers. A test control signal transmitted / received between the subscriber line transmission devices in a communication network configured to connect a plurality of stations via multiplex transmission lines, wherein the overhead bits included in a transmission frame transmitted / received on the multiplex transmission lines A test control signal used in a communication network, characterized in that a test type and a test target channel number are encoded and assigned to a bit string generated in the multi-frame, and transmitted and received between the subscriber line transmission devices. 7.The transmission device according to claim 1, wherein The demultiplexing circuit is equipped with a through circuit that allows signals to pass.
It is possible to install the above, based on the instruction of the setting means
The transmission device by controlling the connection control circuit and the through circuit
Edit the connection between the above channels in the
Edit connection between channelsIs something The through circuit was composed only of hardware This
And a transmission device.