JPH0396149A - Control signal transmission processing method - Google Patents

Abstract

PURPOSE:To avoid erroneous control by replacing a control signal from a trans mission line or a path into a control signal not giving a significant action onto a controlled system when fault or disturbance is detected and sending the re placed signal to a master equipment and a sub equipment. CONSTITUTION:Upon the receipt of fault or disturbance, line terminators 12, 15 replace a control signal received from transmission lines 13, 14 into a control signal not giving any significant operation to a master set 11 and a sub set 16 at fault processing circuits 17, 18 respectively and send the result to the master set 11 and the sub set 16. Moreover, the control signal not giving any significant operation is a control signal even when it is received, a call processing node (exchange) does not any processing such as a control signal making a controlled system in standby state (that is, a control signal representing a call setting release state (a state whose call is not set)). or a control signal representing a test lock release state (state of no test). Thus, the execution of erroneous control is avoided.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention transmits control signals between a main device and a remotely located sub-device via a transmission line or a path arranged in a transmission line. to set up a bidirectional or unidirectional transmission/reception line,
An abnormality in a transmission line or path in a communication system that includes a call processing node that performs processing such as release or test pull-in,
The present invention relates to a control signal transmission processing method performed at the time of disturbance.

[Conventional technology]

Conventionally, the unit (sub-equipment) equipped with the subscriber circuit of the exchange (call processing node) and the main unit (main unit) from the concentrator line equipment connected to this unit were installed, for example, adjacently within the same station building. , were directly connected to each other. Recently, there has been a request to install a unit (sub device) equipped with a subscriber circuit in a user's building away from the concentrator (main device) side. They need to be connected to each other. That is, for example, as shown in FIG.
4 kb eight digital data) D and a control signal (digital data) S are transmitted and received, and the circuit termination device 12 multiplexes these data and outputs it to the transmission line l3, and also outputs the multiplexed data to the transmission line 14.
The multiplexed data from the multiplexed data is demultiplexed and sent to the main device II. A line terminating device 15 is connected to the other end of the transmission line 13, 14, and the line terminating device 15 separates the multiplexed data from the transmission line 14 into sub-devices (units equipped with subscriber circuits) for supporting subscribers. ) to the transmission line l6, and multiplexes the subscriber-compatible voice signal D and control signal S from the sub-device 16 to the transmission line l6.
Send to 3. The control signals S include control signals for call processing, such as a signal indicating off-hook when a call is made and a signal indicating an incoming call state, as well as test control signals.

In this way, the sub-device 16 is provided at a remote location from the main device l1, and these are connected by transmission paths 13 and 14, and the transmission path 1
3.14 or transmission and reception of control signals between the main device 11 and the sub device 16 in both directions or in one direction via paths arranged in these transmission lines 13.14, line setting, cancellation, test lead-in, etc. If this process is carried out, the control signal S will change due to an abnormality or disturbance in the transmission line 13 or 14, and due to the incorrect control signal, for example, multiple subscribers will be in a calling/receiving state at the same time, and the call will be interrupted. There is a risk that the processing node may experience a system failure or an abnormal state may occur in which multiple test retracting switches are closed at the same time due to an incorrect control signal.

For this reason, in the past, the line terminating device 12. 15 constantly monitors abnormalities and disturbances in the transmission lines 13 and 14, and when an abnormality or disturbance is detected, a transfer alarm ALM indicating this is sent to the main device l1 and the sub device l6, and the main device 11 receives this.
Alternatively, the sub-device 16 ignores the control signal S corresponding to the transfer alarm ALM and does not perform the corresponding control operation, thereby preventing erroneous control from being executed.

[Problem to be solved by the invention]

If a new call processing node is installed and its sub equipment and main equipment are separated from each other in a remote location, it can be designed and manufactured as shown in Figure 2. There are cases where you want to separate the sub-devices of a node and install them in a remote location, and in that case, you may want to avoid modifying the main and sub-devices as much as possible. In this case, even if the abnormality detection results in the transmission line section are transferred to the main device or the sub-device, the main device or the sub-device does not have the function to respond and process the results, so incorrect control is executed due to the transmission path abnormality. There is a risk that

[Means to solve the problem]

According to this invention, abnormalities and disturbances in the transmission line between the main device and the sub-device or a path arranged in the transmission line are constantly monitored, and when an abnormality or disturbance is detected, a control signal from the ζ transmission line or path is transmitted. Replaces the control signal with a control signal that does not perform any meaningful operation for the controlled system (main device or sub device) and sends it to the main device or sub device. [Embodiment] FIG. 1 shows an embodiment of the present invention, and parts corresponding to those in FIG. 2 are given the same reference numerals. However, line termination device 12.
15 constantly monitors abnormalities and disturbances in the transmission lines 13 and 14, respectively, and when an abnormality or disturbance is detected, an alarm ALM of the abnormality detection result is sent to the main device 11 and sub-device f & 16, respectively.
It will not be forwarded to. In this invention, the line termination device 12.15 is the transmission line 1
When an abnormality or disturbance in 3.14 is detected, the transmission line 13.14
The abnormality processing circuits 17 and 18 replace the control signals received from the main device 11 and the sub device 16 with control signals in which the main device 11 and the sub device 16 do not perform any significant operation, respectively, and send the control signals to the main device 11 and the sub device 16.
Control signals that do not perform any significant operation include, for example, control signals that put the controlled system in a standby state, control signals that indicate a call setting release state (no call setting), and test pull release state (no test being performed). This is a control signal such as a control signal indicating a call processing node (exchange) that does not perform any processing even if the control signal is received. In other words, main equipment Wl1
The control signal for the sub-device 16 is a control signal indicating that the subscriber is not making a call or that the subscriber is not receiving a call (not in a call J1!), and the control signal for the sub-device 16 is a control signal that indicates that the subscriber is not making a call or receiving a call (J1!). This is a control signal that indicates a state in which the test control is not performed or is not subject to test control. The line termination device 12.15 constantly monitors the status of the transmission line 13.14, and when the status of the transmission line is restored to normal, the control signal received from the transmission line 13.14 is directly transferred to the main unit l1, to the device 16.

According to the present invention, if a transmission path abnormality is detected in the line termination device due to a momentary interruption of the transmission path or an extremely short code error, the control signal is replaced in the abnormality processing circuit.
The replaced control signal may be sent to the main device or the sub device for a short period of time, but if the duration is extremely short, about the same as the normal frame synchronization recovery time, the call in progress will be disconnected. Such negative effects can be prevented.
[Effects of the Invention] As described above, according to the present invention, an existing call processing node is separated into a main device and a sub device, placed in a remote location, and connected to each other via a transmission path to perform call processing and testing. When performing pull-in processing, without making any changes to the main device or sub-device,
It is possible to prevent incorrect control from occurring even if abnormalities or disturbances occur in the transmission path.

[Brief explanation of drawings]

Claims (1)

[Claims] (1) Send and receive control signals bi-directionally or unidirectionally between the main device and a remote sub-device via a transmission path or a path placed within the transmission path to set up and release the line. Alternatively, in a communication system including a call processing node that performs processing such as test pull-in, the transmission line or a path placed in the transmission line is constantly monitored for abnormalities and disturbances, and if an abnormality or disturbance is detected, the transmission line Alternatively, a control signal transmission processing method characterized in that a control signal from a path is replaced with a control signal that does not perform any significant operation for a controlled system, and the control signal is sent to a main device and a sub device.