JPH09187050A - Channel management information initial setting system between exchange and remote terminal station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To match channel assignment management information between two equipments (a digital exchange and a remote digital terminal station contained in the digital exchange) by allowing one equipment to execute matching processing with the other equipment when the one equipment initializes the channel assignment management information between the digital exchange and the remote digital terminal station contained in the digital exchange. SOLUTION: A digital exchange 100 is provided with an initial setting processing section 110 and a channel assignment management information matching processing section 111, and a remote digital terminal station 200 is provided with an initial setting processing section 210 and a channel assignment management information matching processing section 211. Then when either of the digital exchange 100 and the remote digital terminal station 200 detects a fault, the exchange or the terminal station detecting the fault initializes the channel assignment management information of itself and executes the matching processing with the other so as to make the channel assignment management information in matching with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an initial setting process of channel allocation information and control channel management information between a digital exchange and a remote digital terminal station accommodated in the digital exchange.

For example, a digital exchange (to be referred to as an exchange hereinafter) and a remote digital terminal station (to be referred to as a remote terminal station hereinafter) are connected by a plurality of PCM lines.
Communication is performed by setting a subscriber information transfer channel and a maintenance information transfer control channel on the M line. The channel allocation information between the exchange and the remote terminal station is stored in memory by the exchange and the remote terminal station respectively.When the exchange and the remote terminal station are opposed to each other for the first time, the channel allocation information between the exchange and the remote terminal station is stored. Initial setting.

After the initial setting of the channel allocation information, when a call occurs, an arbitrary empty channel on the PCM line is allocated as a subscriber information transfer channel to make a call, and when the call ends, the allocated subscriber information transfer The open channel.

FIG. 14 shows a channel allocation sequence diagram between the exchange and the remote terminal station. The figure shows the sequence when the remote terminal station 200 sends a channel allocation request to the exchange 100.

A terminal with a status number 00 (unused status) accommodated in the remote terminal station 200 sends a channel allocation request (hereinafter referred to as a SETUP signal) to the exchange 100. The remote terminal station 200 sends out a SETUP signal and enters a channel allocation completion waiting state (state number 01).

The exchange 10 which has received the SETUP signal
0 searches for an empty channel and performs channel allocation. The channel allocation is completed, and a channel allocation completion notification including the channel allocation information (hereinafter referred to as CONN signal) is sent to the remote terminal station 200.

The exchange 100 sends a CONN signal to the remote terminal station 200 and waits for a channel allocation completion response signal (state number 08). The remote terminal station 200 writes the received channel allocation information in the main memory.

The remote terminal station 200 writes the channel allocation information in the main memory device and then sends a channel allocation completion response signal to the exchange 100. By the processes of to, the channel assignment is completed in the exchange 100 and the remote terminal station 200, and the state of use (state number 1
0).

When the above-mentioned channel allocation is performed, the channel allocation information is the exchange 100 and the remote terminal station 2.
00 as main channel allocation management information.

On the PCM line connecting the exchange 100 and the remote terminal 200, a control channel for allocating the above-mentioned subscriber information transfer channel is allocated. The control channel is duplicated because it transfers important information for system operation. One of these is called the Primary Channel,
The other is called a protection channel.

FIG. 15 is a diagram for explaining the connection between the exchange and the remote terminal station. The figure shows a PC with an exchange 100 and a remote terminal 200.
This is an example of connection by M lines L1 to Ln. When a large number of terminals T accommodated in the exchange 100 exist in distant places,
Since it is costly to install the subscriber line for each of the terminals T, the terminals T are installed at the remote terminal station 20.
After being accommodated in 0, the remote terminal station 200 and the exchange 100 are connected by the PCM lines L1 to Ln, so that the plurality of terminals T in a remote place are economically accommodated in the exchange 100.

In the PCM lines L1 to Ln shown in the figure, a primary channel (channel is shown as CH in the figure) and a protection channel can be provided as control channels on arbitrary lines. A call is controlled by establishing a logical link on this control channel and sending channel control information on the link. These two control channels are functionally equivalent, and the primary channel is used as the control channel when the exchange 100 and the remote terminal station 200 start up.

In this way, when one control channel becomes the ACT system (active system), the other control channel becomes the SBY system (standby system), and the call control is performed by the information of the ACT system. All information on the control channel is discarded. The ACT / SBY management information of this control channel is the same as the channel allocation management information, and the exchange 100,
Also, it is stored in the main storage device of the remote terminal station 200.

In the exchange and the remote terminal station, when one device initializes the channel allocation management information, a matching process with the other device is executed to match the channel allocation management information between the two devices. There is a demand for a channel management information initial setting method between a switch and a remote terminal that can perform the above.

[0015]

2. Description of the Related Art FIG. 16 is a block diagram for explaining a conventional example. The figure shows a communication system composed of an exchange 100 and a remote terminal station 200. Although the figure shows only one remote terminal station 200, the operation is the same in a system including a plurality of remote terminal stations 200.

In the figure, the exchange 100 stores a file memory 121 for storing subscriber mounting information 121a, channel allocation management information (hereinafter, channels are shown as CH) 122a, an exchange processing program (not shown) and the like. And a call processing unit 1 for executing call processing based on the exchange processing program in the main memory 122.
01, a software abnormality detection unit 130 that detects an abnormality of the exchange 100, and an initialization processing unit 1 that initializes the channel allocation management information 122a on the main storage device 122 when the software abnormality detection unit 130 detects an abnormality.
10.

The remote terminal station 200 also has the same structure as the local exchange 100, and includes a file memory 221 and a main storage device 22.
2, call processing unit 201, software abnormality detection unit 230,
Also, the initial setting processing unit 210 is provided. Also, L
Is a PCM line that connects the exchange 100 and the remote terminal station 200.

When the exchange 100 and the remote terminal station 200 are also opposed to each other for the first time, the channel allocation management information 122a and 222a on the main storage devices 122 and 222 are initialized respectively. And when a call connection request occurs,
An empty channel on the PCM line L is allocated, and the allocation information is used as channel allocation management information in the main storage device 12.
Write to 2, 222. In this way, after the initial settings are made, the exchange 100 and the remote terminal station 200 hold the same channel allocation management information.

When the software abnormality detecting units 130 and 230 of the exchange 100 and the remote terminal station 200 detect an abnormality with such a configuration, the initial setting processing units 110 and 210 cause the channel allocation management information on the main storage devices 122 and 222. Perform the initial setting of.

Further, the switching of the primary channel / protection channel on the PCM line L connecting the exchange 100 and the remote terminal station 200 is performed by the initial setting processing units 110 and 210 in the case of a failure of the primary channel or by a command input. It is started and the initial setting is performed.

FIG. 17 shows a processing sequence of the control CH management information. The figure shows that the exchange 100 and the remote terminal 200 are communicating with each other using the protection channel.
Is an example in which an abnormality is detected and initialization is performed.

(A) shows control CH management information. As initial values, the ACT system is registered as the primary CH and the SBY system is registered as the protection CH. (B) shows a sequence for transmitting a control CH switching command from the exchange 100 to the remote terminal station 200 for switching.

The exchange 100 and the remote terminal station 200 communicate by setting a primary channel as an ACT system for the control CH. The switch 100 sends a request for switching the control CH to the protection channel to the remote terminal station 200.

In the exchange 100, the control CH state transition is in the process of switching. The remote terminal station 200 switches the ACT system to the protection channel. The remote terminal station 200 notifies the exchange 100 that the ACT system has been switched to the protection channel.

From the exchange 100 to the remote terminal station 200
In both cases, a protection channel is set in the ACT system, and communication is possible. The control channel state transition becomes unprocessed and returns to the initial state.

[0026]

In the above-mentioned conventional example, when the switch 100 and the remote terminal station 200 detect a software abnormality, for example, and the apparatus that detects the abnormality performs the initialization, the initialization is performed. It is necessary to recognize that in some way and perform initialization of the other device.

It is necessary to perform the initial setting for the channel allocation management information and the control channel management information.
For example, the exchange 100 detects a software error,
When the channel allocation management information 122a in the main memory 122 is automatically initialized (hereinafter referred to as memory reset), the maintenance person recognizes that the initialization is performed and goes to the installation location of the remote terminal station 200. A command is input from the maintenance terminal to initialize the channel allocation management information 222a.

Further, the remote terminal station 200 is often installed at a place distant from the exchange 100, and further, the exchange 1
00 may accommodate a plurality of remote terminal stations 200. In such a case, the maintenance person may use a plurality of remote terminal stations 2
It is necessary to visit the installation location of 00, and maintenance efficiency is poor. In addition, until the memory is reset, the subscriber accommodated in the remote terminal station 200 cannot call and the exchange service is deteriorated.

FIG. 18 shows a processing sequence of control CH management information when a software abnormality is detected in the conventional example. The figure shows that when the exchange 100 and the remote terminal station 200 are communicating using the protection channel as the ACT system, the exchange 1
00 is a processing sequence when a software abnormality is detected and the control channel is switched.

The exchange 100 and the remote terminal station 200 communicate by registering that the protection channel is the ACT system as control channel management information. ; Detecting an abnormality in the exchange 100 software.

The initialization processing of the control channel management information of the exchange 100 is performed. The remote terminal station 200 is not notified by the exchange 100 that the software abnormality has been detected and the control channel management information has been initialized.

The remote terminal station 200 remains as it is,
Holds the state of. The control channel management information does not match between the exchange 100 and the remote terminal station 200, and communication becomes impossible.

According to the present invention, the exchange and the remote terminal station accommodated in the exchange automatically assign the channel allocation management information and the control channel management information between the switch and the remote terminal station. Attempts to realize the channel management information initial setting method.

[0034]

Means for Solving the Problems FIG. 1 is a block diagram for explaining the first principle of the present invention. The figure shows a remote terminal station 200 accommodated in the exchange 100.
And the exchange 100.

In the present invention, the exchange 100 detects the failure of the exchange 100 and detects the channel allocation management information 122.
an initial setting processing unit 110 for initializing a, and a channel allocation management information matching processing unit 111 for performing matching processing with the remote terminal station 200 after initializing the channel allocation management information 122a in the local exchange 100. It consists of.

Further, the remote terminal station 200 is the remote terminal station 200.
The initial setting processing unit 210 which detects the failure of the channel allocation management information and initializes the channel allocation management information, and the channel allocation management information 222a in the local remote terminal station 200 are initialized, and then the matching process is performed between the exchange 100 and the switch 100. A channel allocation management information matching processing unit 211 is provided. L is the exchange 10
0 is a PCM line connecting the remote terminal station 200.

Here, when a failure is detected in either the exchange 100 or the remote terminal station 200, the channel allocation management information 122a, 222a of the own device is initialized, and then a matching process with the partner device is executed. The channel allocation management information 112a and 222a are matched.

By this processing, when one device detects a failure and the channel allocation management information 122a, 222a is initialized, a matching process with the partner device is automatically performed to match the channel allocation management information 122a, 222a. Can be made.

FIG. 2 is a block diagram for explaining the second principle of the present invention. 2, the channel allocation management information matching processing units 111 and 211 of FIG. 1 are configured by control channel management information matching processing units 111A and 211A, and subscriber mounting information 121a and 221a and channel allocation management information 122 are provided.
a, 222a to control channel allocation information 121b, 2
21b and control channel management information 122b and 222b.

When a failure is detected in either the exchange 100 or the remote terminal station 200, the control channel management information 122b, 222b of its own device is initialized, and the control channel management information matching processing units 111A, 211A are used to make the other device. And the control channel management information 122b, 2
22b Match.

By this processing, when one device detects a failure and the control channel management information 122b, 222b is initialized, a matching process with the partner device is automatically performed to obtain the control channel management information 122b, 222b. Can be matched.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an embodiment (1) of the present invention.
FIG. The figure shows an embodiment corresponding to the first invention.

In the figure, reference numeral 100 denotes an exchange, and reference numeral 121 denotes a file memory for storing subscriber installation information 121a such as telephone numbers of all subscribers accommodated in the exchange 100 and the remote terminal station 200, service provision classes of the subscribers, and the like. Yes, the memory is not reset in the initialization process. Further, 122 is channel allocation management information 122a for linking the subscriber accommodation position information (information for identifying the subscriber such as subscriber's telephone number) and the channel number, and an initial setting flag 12 indicating initial setting is being performed.
2c, a main storage device for storing matching target subscriber data (data is shown as D in the drawing) 122d indicating a target subscriber for initialization, and a memory reset by the initialization processing.

Further, 110 is channel allocation management information 1
22a is an initialization processing unit for performing initialization.
Reference numeral 1 denotes a channel allocation management information matching processing unit (shown as a CH allocation matching processing unit in the figure) that performs matching processing with the remote terminal station 200, and 101 is a call processing unit for controlling call processing.
Reference numeral 30 is a software abnormality detection unit that detects a software abnormality.

Reference numeral 200 denotes a remote terminal station housed in the exchange 100, which has the same configuration as the exchange 100.
00 and the remote terminal station 200 are connected by a PCM line L. FIG. 4 shows a processing flow chart when a software abnormality is detected according to the present invention. The processing will be described below according to the processing steps (denoted by S in the figure).

S1: The software abnormality detection unit 130 detects a software abnormality. S2: The initial setting processing unit 110 clears the channel allocation management information 122a on the main storage device 122.

S3: The channel allocation management information matching processing section 111 executes the matching processing of the channel allocation management information 122a. FIG. 5 shows a flowchart of the CH allocation management information matching processing unit of the present invention. The figure is a detailed flowchart of the matching process of the channel allocation management information in S3 described in FIG.

S1: The channel allocation management information matching processing unit 111 sets an initial setting flag 122c indicating that channel allocation is being initialized. S2: Subscriber mounting information 121 on the file memory 121
The subscriber accommodation position information of all the subscribers accommodated in the remote terminal station 200 is extracted from a, and the subscriber data to be matched is edited.

S3: It is judged whether or not the matching process for all subscribers to be matched is completed. S4: When the matching process is not completed, the target subscriber who executes the matching process is specified.

S5: The matching process for the specified matching target subscriber is executed. S6: The subscriber who has completed the matching process is deleted from the matching subscribers edited in S2.

S7: When the matching process of all the subscribers of the matching process is completed, the matching flag is reset. With such processing, for example, the channel allocation management information matching processing unit 111 of the exchange 100 performs the matching processing, so that the remote terminal station 200 can be matched with the channel allocation management information.

FIG. 6 shows a CH allocation management information matching processing sequence according to the present invention. Here, an example will be described in which a software abnormality is detected in the exchange 100 while the subscriber An of the exchange 100 is in a call using an arbitrary channel on the PCM line L.

When the software abnormality detection unit 130 detects a software abnormality, the initial setting processing unit 110 clears the main storage device 122, and sets the channel allocation management information 122a to the unused state (state number 00). Set the initializing flag.

On the other hand, since the channel allocation management information of the remote terminal station 200 remains in use (status number 10), a mismatch occurs in the channel management status between the local exchange 100 and the remote terminal station 200. .

The exchange 100 sends a channel state inquiry message of the channel used by the subscriber An to the remote terminal station 200. The remote terminal station 200 edits the state of the channel used in its own device into a channel state notification message and sends it back to the exchange 100 on the control channel.

The exchange 100 compares the channel status managed by itself with the channel status on the channel status notification message. If the states match, the matching process of the next subscriber An + 1 is executed.

If the states do not match, a channel release request message is sent to the remote terminal station 200. The remote terminal station 200 clears the channel allocation information (state number 00) and then sends a channel release completion message to the local exchange 100.

The channel management states are matched by the processes of. Upon receiving the channel release completion message, the local exchange 100 starts the matching process for the next subscriber An + 1.

Based on the subscribers to be matched, the remote terminal station 20
By performing the above-mentioned matching process for all subscribers of 0, matching of channel allocation information between the exchange 100 and the remote terminal station 200 becomes possible.

The process surrounded by a dotted line in the figure shows the matching process of the present invention. FIG. 7 shows a flow chart for prevention of conflict between the CH allocation management information initial setting process and the channel allocation process of the present invention. In the present invention, the main storage device 122 is provided with an initial setting flag 122c indicating that the channel allocation management information is being initialized, and whether or not the channel allocation management information initial setting is being performed by the channel allocation initial setting determination unit (not shown). By making such a decision, competition is prevented.

S1: The channel allocation initial setting determination unit determines whether the initial setting flag 122c is "on". S2: When the initial setting flag 122c is "ON",
The target subscriber information for which matching processing is performed is searched.

S3: It is determined whether the subscriber is included in the matching subscriber data 122d. S4: If the subscriber includes the matching target subscriber data 122d, the matching process of the subscriber is executed.

S5: The subscriber information is deleted from the matching subscriber information. S6: If the channel allocation management information is not being initialized in S1, the subscriber is not included in the matching target subscriber data in S3, or the matching processing of the matching processing target subscriber is completed in S5, the channel allocation processing is performed. To execute.

FIG. 8 shows the CH-designated state inquiry message of the present invention, and FIG. 9 shows the CH-designated state notification message of the present invention. Generally, the number of subscriber lines accommodated in the remote terminal station 200 is larger than the total number of channels on the PCM line L between the remote terminal station 200 and the local exchange 100, and the remote terminal station 200 concentrates. Therefore, when issuing the status inquiry message, the number of messages can be reduced by issuing the inquiry message by the channel unit, rather than by issuing the inquiry message by the subscriber line unit. FIG. 19 shows a message structure of a conventional example, which is for comparison with the message of the present invention. (A) shows a conventional state inquiry message, and (B) shows a conventional state notification message. . In FIG. 19,
The subscriber line number is specified in the 1st and 2nd octets to inquire about and notify the status.

On the other hand, in the channel inquiry status inquiry message of the present invention shown in FIG. 8, a global subscriber line number is set in the 1st and 2nd octets, and a channel specification information element is set in the 4th to 7th octets. A detailed information identifier, a detailed information data length, a PCM line number, and a channel number are set and a status inquiry is made.

FIG. 10 shows a PCM line designation status inquiry message of the present invention, and FIG. 11 shows a PCM line designation status notification message of the present invention. That is, FIG.
Message to issue a status inquiry message specifying the PCM line, and as a response to the specified PC
The statuses of all channels on the M line are read and returned as a status notification message. By such processing,
It is possible to efficiently send and receive the status inquiry message and the status notification message.

FIG. 12 is a block diagram for explaining the embodiment (2) of the present invention. The figure shows an embodiment (2) corresponding to the second invention. Reference numeral 100 in the figure denotes a switchboard, and shows a configuration of a part related to initial setting of control channel management information. Reference numeral 121 is a file memory that stores control channel allocation information 121b, which is a memory that is not reset in the initialization process, and 122 is A of the control channel.
It is a main storage device that stores the control channel management information 122b indicating the setting state of CT / SBY, and is a memory that is reset by the initialization process.

Reference numeral 111 is control channel management information 1
22b is an initialization processing unit for performing initialization.
Reference numeral 1A is a control channel management information matching processing unit (shown as a control CH information matching processing unit in the figure) that performs control channel matching processing with the remote terminal station 200, and 101 and 130 are the embodiments (1). The call processing unit and the software abnormality detection unit described in 1.

Further, reference numeral 200 in the figure shows the configuration of the part related to the initial setting of the control channel management information of the remote terminal station 200 accommodated in the exchange 100, which is the same as the exchange 100.

When the software abnormality detection unit 130 detects an abnormality due to a software bug or the like during operation of the exchange 100, the initialization processing unit 110 is activated. In the initialization processing unit 110, the control channel management information 122
The main memory 122 including b is cleared.

The initial setting processing unit 110 reads the control channel allocation information 121b, initializes the control channel management information 122b, switches the control channel by the control channel management information matching processing unit 111A, and sets the remote terminal station 200. Performs matching processing between and and enters the normal operation state.

FIG. 13 shows a sequence of matching processing of control channel management information. The figure shows an exchange 100 and a remote terminal 2
00 is using a protection channel as a control channel to perform control, the exchange 100 detects a software error, and shows the processing sequence when the protection channel used as the control channel is switched to the primary channel. Show.

When the exchange 100 detects a software error, the initialization processing unit 110 initializes the control channel and switches the protection channel used as the ACT to the primary channel.

The remote terminal station 200 remains the protection channel as the ACT, and the control channel management information between the exchange 100 and the remote terminal station 200 is inconsistent.

The control channel management information matching processing section 111A of the exchange 100 sends a matching request to the remote terminal station 200. At this time, the exchange 100 is in the matching state.

The remote terminal 200 receives the matching request,
Switch ACT to primary channel. The remote terminal station 200 switches the control channel to the exchange 100 and returns a matching response.

When the exchange 100 receives the control channel switching matching response, it refers to the matching flag and determines whether or not matching is in progress. If matching is in progress, the control channel management information 122b is left as it is and the channel states are matched. ACT / S of control channel if not matching
Rewrite BY management information.

By this processing, the control channel management information of the exchange 100 and the remote terminal station 200 match, the normality of communication is guaranteed, and normal communication processing becomes possible.

[0079]

According to the present invention, when the subscriber information transfer channel is initialized by one of the exchange and the remote terminal station, a matching request is sent to the partner device and the matching process is automatically performed. It will be possible. This matching process eliminates the need for the maintenance person to visit the installation location of the remote terminal station and perform the initial setting, and the efficiency of maintenance work can be improved.

Before the channel allocation processing, the channel allocation initial setting flag can be referenced to prevent a conflict between the channel allocation processing and the channel allocation management information initial setting processing.

Further, by providing the matching target subscriber data, it is possible to prevent duplicate execution of the channel allocation management information initial setting process. Then, when the control channel management information is initially set by both the exchange and the remote terminal station, a matching request can be sent to the partner device and the matching process can be automatically performed. Can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a first principle of the present invention.

FIG. 2 is a block diagram illustrating a second principle of the present invention.

FIG. 3 is a block diagram illustrating an embodiment (1) of the present invention.

FIG. 4 is a flowchart of processing when a software abnormality is detected according to the present invention.

FIG. 5 is a flowchart of a CH allocation management information matching processing unit of the present invention.

FIG. 6 is a CH allocation management information matching processing sequence according to the present invention;

FIG. 7 is a flowchart for preventing conflict between CH assignment management information and CH assignment processing according to the present invention.

FIG. 8 is a CH inquiry state inquiry message of the present invention.

FIG. 9 is a CH designation status notification message of the present invention.

FIG. 10: Status inquiry message for PCM line designation according to the present invention

FIG. 11 is a PCM line designation status notification message of the present invention.

FIG. 12 is a block diagram illustrating an embodiment (2) of the present invention.

FIG. 13 is a matching processing sequence of control CH management information according to the present invention.

FIG. 14 is a CH allocation sequence between the exchange and the remote terminal station.

FIG. 15 is a diagram for explaining the connection between the exchange and the remote terminal station.

FIG. 16 is a block diagram illustrating a conventional example.

FIG. 17 is a processing sequence of control CH management information.

FIG. 18 is a processing sequence of control CH management information when a software abnormality is detected in the conventional example.

FIG. 19 is a message structure of a conventional example.

[Explanation of symbols]

 100 Switch 200 Remote terminal 101, 201 Call processing unit 110, 210 Initial setting processing unit 111, 211 CH allocation management information matching processing unit 111A, 211A Control CH management information matching processing unit 121, 221 File memory 121a, 221a Subscriber Implementation information 121b, 221b Control CH allocation information 122, 222 Main storage device 122a, 222a CH allocation management information 122b, 222b Control CH management information 122c, 222c Initializing flag 122d, 222d Match target subscriber data 130, 230 Software abnormality detection unit L, L1 to L8 line T terminal

Claims (5)

[Claims] 1. A method of initializing channel management information between a remote digital terminal station housed in a digital exchange and a digital exchange, wherein the digital exchange detects a failure in the digital exchange and detects channel allocation management information. An initial setting processing section for performing initial setting, a channel allocation management information matching processing section for performing matching processing with a remote digital terminal station after initializing the channel allocation management information in the own digital exchange, and the remote digital terminal. The station detects an error in the remote digital terminal station and initializes the channel allocation management information, and after initializing the channel allocation management information in the remote digital terminal station, the station establishes a connection with the digital exchange. A channel allocation management information matching processing unit that performs matching processing between When a failure is detected by either the local exchange or the remote digital terminal, the channel allocation management information of the own device is initialized and then the matching process with the partner device is executed to match the channel allocation management information. A method for initializing channel management information between a switch and a remote terminal. 2. The channel management information initial setting method between the exchange and the remote terminal station according to claim 1, further comprising a channel allocation initial setting determination unit for determining whether or not the channel allocation management information is being initialized. When a channel allocation request is issued, the channel allocation initial setting determination section determines whether or not the channel allocation initial setting is in progress. If the initial setting is in progress and if the subscriber needs matching processing, 2. The channel management information initial setting method between the exchange and the remote terminal station according to claim 1, wherein the channel allocation processing is executed after the matching processing. 3. A channel management information initial setting method between an exchange and a remote terminal station according to claim 1, wherein when initializing channel allocation management information, a PCM line connecting the digital exchange and the remote digital terminal station. 2. The exchange and the remote terminal according to claim 1, further comprising: a channel-corresponding state inquiry unit for making a state inquiry corresponding to each channel, and inquiring about the other party's state during the channel allocation initial setting process. Initial setting method for channel management information between stations. 4. A channel management information initial setting method between an exchange and a remote terminal station according to claim 1, wherein when initializing channel allocation management information, a PCM line connecting the digital exchange and the remote digital terminal station. 2. A channel between the exchange and a remote terminal station according to claim 1, further comprising a PCM line-corresponding state inquiring section for inquiring the state of correspondence, and inquiring about the state of the other party during the channel allocation initial setting process. Management information initialization method. 5. A control channel management information setting method between a remote digital terminal station accommodated in a digital exchange and a digital exchange, wherein the digital exchange detects a failure of the digital exchange and controls channel management information. Control channel management information for initializing the control channel management information in the local digital exchange and the control channel management information for initializing the control channel management information in the local digital exchange. A matching processing unit, the remote digital terminal station, an initialization processing unit that detects a failure of the digital exchange and initializes control channel management information, and an initial setting of control channel management information in the remote digital terminal station. A control channel that is set and performs control channel management information matching processing with the digital exchange. A management information matching processing unit, when a failure is detected in any of the digital exchange or remote digital terminal, the control channel management information of its own device is initialized, and matching processing with the partner device is executed, A method for initializing channel management information between an exchange and a remote terminal station, which is characterized by matching control channel management information.