JPH0777393B2 - Control signal transmission processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a control signal between a main device and a remote device placed via a transmission path or a path arranged in the transmission path. Send and receive in both directions in one way and set up the line,
Abnormality of the transmission line or path in the communication system including the 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, for example, a unit (sub device) equipped with a subscriber circuit of an exchange (call processing node) and a main body side (main device) of a concentrating speech path device connected thereto are provided adjacent to each other in the same station building. , Were directly connected to each other.

Recently, there is a demand to install a unit (sub device) equipped with a subscriber circuit in the user's building, away from the concentrator channel device side (main device). In this case, the sub device and the main device are connected via a transmission line. Must be connected to each other. That is, for example, as shown in FIG. 2, the line concentrator device side of the main device 11 corresponds to the line terminating device 12 and a subscriber and a voice signal (for example, 64 kb / s).
Digital data) D and control signal (digital data) S
Is transmitted and received, the circuit terminating device 12 multiplexes these data and outputs them to the transmission line 13, and demultiplexes the multiplexed data from the transmission line 14 and sends out to the main device 11. Transmission line 13,14
The line terminating device 15 is connected to the other end of the line termination device 15. The line terminating device 15 demultiplexes the multiplexed data from the transmission line 14 and sends it to the sub device (unit equipped with the subscriber circuit) 16 corresponding to the subscriber. The voice signal D corresponding to the subscriber and the control signal S from the sub device 16 are multiplexed and sent to the transmission line 13. The control signal S includes a control signal for testing as well as a control signal for call processing, such as a signal indicating off-hook at the time of making a call and a signal indicating an incoming call state.

In this way, the auxiliary device 16 is provided at a remote place from the main device 11, and these are connected by the transmission lines 13 and 14, and the transmission lines 13 and 14 or the paths arranged in these transmission lines 13 and 14 are used. Main device 1
If control signals are sent and received bidirectionally or unidirectionally between 1 and the sub device 16 to perform processing such as line setting, cancellation, or test pull-in, control signals due to abnormalities in the transmission lines 13 and 14 and disturbances. When S changes, an erroneous control signal causes, for example, a plurality of subscribers to make or receive calls all at once, the system of the call processing node goes down, or an erroneous control signal causes a plurality of test pull-in switches to close at the same time. There is a risk of an abnormal condition.

For this reason, when the main device and the auxiliary device are separated from each other in the past, the line terminators 12 and 15 constantly monitor the abnormality and the disturbance of the transmission lines 13 and 14, and when the abnormality and the disturbance are detected, indicate that. The transfer alarm ALM is sent to the main device 11 and the sub device 16, and the main device 11 or the sub device 16 having received the transfer alarm ALM ignores the control signal S corresponding to the transfer alarm ALM and does not perform the corresponding control operation. Was used to prevent incorrect control from being executed.

[Problems to be Solved by the Invention]

When a call processing node is newly provided and the sub device and the main device are separated from each other in a remote place, the design and manufacture may be performed as shown in FIG. 2, but the existing call processing provided in the same station building In some cases, it may be desirable to install the sub-device of the node in a remote location, and in that case, it may not be desirable to modify the main device and sub-device, such as adding a control signal acceptance prohibition function when an alarm ALM is received. In this case, even if the abnormality detection result in the transmission path section is transferred to the main device or the sub device, the main device and the sub device do not have the function of prohibiting the control signal acceptance in response to this, so the transmission line error may cause an error. Control may be performed.

[Means for Solving the Problems]

According to the present invention, the transmission line between the main device and the sub device or the abnormality and the disturbance of the path arranged in the transmission line are constantly monitored, and when the abnormality or the disturbance is detected, the control signal from the transmission line or the path is transmitted. Replaced by a control signal that does not operate significantly for the controlled system (main device or auxiliary device),
Or send it to the sub device.

〔Example〕

An embodiment of the present invention is shown in FIG. 1 and the same reference numerals are given to the portions corresponding to those in FIG. However, the line terminator 12,15
Constantly monitors the transmission lines 13 and 14 for abnormalities and disturbances, but does not transfer the alarm ALM of the abnormality detection result to the main device 11 and the auxiliary device 16, respectively, when the abnormality or the disturbance is detected.

In the present invention, when the line terminators 12 and 15 detect an abnormality or a disturbance in the transmission lines 13 and 14, the control signals received from the transmission lines 13 and 14 are processed by the abnormality processing circuits 17 and 18 by the main device 11 and the sub device 16, respectively. Main device by replacing with control signals that do not operate significantly
11. Send to sub device 16. A control signal that does not perform a significant operation is, for example, a control signal that is in a standby state for the controlled system,
That is, the control signal indicating the call setup cancellation state (state not set up), test pull-in release state (state not tested)
A control signal such as a control signal indicating that the call processing node (switch) does not perform any processing even when the control signal is received. That is, the control signal for the main device 11 is a control signal indicating a state in which the subscriber is not calling or a state in which the subscriber is not calling (a state in which no call is being made), and the control signal for the sub device 16 is called from the exchange. It is a control signal that indicates that the test is not applied and that the test control is not received. Line terminator 1
2, 15 constantly monitor the states of the transmission lines 13 and 14, and when the state of the transmission lines is restored to normal, the control signals received from the transmission lines 13 and 14 are directly sent to the main device 11 and the sub device 16. send.

According to the present invention, if a transmission line abnormality is detected in the line terminating device due to a momentary interruption of the transmission line or a code error in an extremely short time, the control signal replacement process is performed in the abnormality processing circuit,
The replacement control signal may be sent to the main unit or the sub unit for a short time, but if the duration is extremely short, such as the normal frame synchronization recovery time, the active call is disconnected. It is possible to prevent adverse effects such as.

〔The invention's effect〕

As described above, according to the present invention, the existing call processing node is separated into the main device and the sub device and arranged at a remote place, and they are connected to each other through a transmission line to perform call processing and test pull-in processing. In that case, without making any changes to the main device and the sub device,
It is possible to prevent erroneous control even if an abnormality or disturbance of the transmission line occurs.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional technique.

Claims (1)

[Claims] 1. A bidirectional or unidirectional transmission / reception of a control signal between a main device and a sub device located at a remote place through a transmission line or a path arranged in the transmission line to set up a line. In the control signal transmission processing method in the communication system including the call processing node that performs processing such as release, test pull-in, etc., the abnormality or disturbance of the transmission path or the path arranged in the transmission path is constantly monitored and A control signal transmission processing method characterized in that, when a disturbance is detected, the control signal from the transmission path or path is replaced with a control signal that does not significantly operate in the controlled system and is sent to the main device and the sub device.