KR20010038497A - Management Method Of Interoffice Trunk Line - Google Patents

Abstract

PURPOSE: A method for managing an inter-office trunk line is provided to exclude the generation of service interruption due to the discordance of a trunk line state and give efficiency to the resource utilization of an inter-office trunk line by confirming and correcting an inter-office state through the transmitting and receiving of a defined line signaling, in operating an inter-office R2 trunk line signal in a single direction. CONSTITUTION: An outgoing trunk line side exchange searches trunk lines contained in its own terminal line by line(S101) and judges whether a blocked trunk line is detected(S102). If the blocked trunk line is detected, the exchange confirms a signal processing bit of a remote terminal actually connected to the line(S103) and judges whether the blocked line keeps in an idle state(S104). If it is judged that it is a line in the idle state, the exchange transmits a line seizure request signal to the remote terminal(S105). Then the exchange confirms a signal processing bit detected from the remote terminal within a preset time(S106) and judges whether the signal processing bit is detected as a seizure completion notification signal(S107). If the signal processing bit is detected as the seizure completion notification state, the exchange transmits a signal to request the recovery of the blocked line, an idle state signal, to the remote terminal(S108) and judges whether a signal processing bit detected from the remote terminal is detected as an idle state(S109). If it is judged that the detected signal processing bit is the idle state, the exchange transits the blocked line to the idle state and recovers it(S110).

Description

Management Method Of Interoffice Trunk Line

The present invention relates to a method for managing a trunk line signal between stations, and more particularly, a circuit between two stations due to an obstacle occurring during signal processing or other reasons in the process of unidirectionally operating an R2 relay line signal of an individual line signaling system. The present invention relates to a trunk line management method for preventing a service interruption due to an inconsistent state.

All wired and wireless switching systems are connected to each other by a relay line called a transmission line, and a signal transmission method is classified into a channel associated signaling (CAS) and a common channel signaling (CCS).

Individual line signaling means that there is no separate dedicated line for transmitting control information such as occupancy and call processing of the line among the lines for the call connecting between stations. It is a method of transmitting a state-converted control signal by putting a signal processing bit, and in the common line signaling method, a dedicated line for only a control signal exists in a line for a call connecting stations, so that the control signal is transmitted through this dedicated line. That's how.

In case of the individual line signaling method, it is a relay signal related to the seizure, response and release of the service line and the register signal related to the address and status transmission of the called party. It uses the R2 signal which is configured, and in the case of a relay line, the relay line is divided into incoming and outgoing in advance, and both ends of the relay line are operated in one-way and two-way, with one side being outgoing and the other being incoming. The line occupancy process in is as follows.

When a relay call is attempted between the switching systems, the outgoing line attempts to occupy the line. The incoming line occupies the corresponding line according to the line occupancy request signal received from the opposing outgoing line. By transmitting a signal for the outgoing line side, data is transmitted and received through the occupied line.

This will be described with reference to the accompanying Figure 1 as follows.

In the R2 relay line signaling between stations, 4 bits of signal processing bits are allocated for line signaling signal processing per line, and the bits indicate signal states of a specific line.

Outgoing line in idle state (Rx: 1001, Tx: 1001) and outgoing line side transmitting / receiving line maintains idle state (Tx: 1001, Rx0001) When trunk line occupancy is required in the switching system, the outgoing line switching system first selects the corresponding line whose relay line state is in the idle state, and then transfers the line occupancy request signal to the incoming line switching system by converting the state through the signal processing bit. (0001).

At this time, the incoming line switching system analyzes the signal processing bit in the signal received from the outgoing line switching system, detects the line occupancy request signal, and then transitions the state of the line from the idle state to the busy state. An acknowledgment signal notifying the relay side switching system that the occupying of the line is performed is transferred through a signal processing bit (1101).

Thereafter, the outgoing line side switching system and the incoming line side switching system perform call processing through the occupied line.

When the line analyzed by the incoming line switching system is determined to be inconsistent with the physical line state between the stations according to the line occupancy request of the outgoing line switching system, the incoming line switching system signals a response signal to the outgoing side switching system. State transition is transmitted through the processing bit (0101).

At this time, the outgoing line side switching system receiving the response signal for the mismatch of physical line state between the stations processes the idle state for the corresponding line and then processes the signal requesting the incoming line switching system side to recover the outgoing line. Transmits the state through the bit and transmits it to the incoming line switching system (1001). The incoming line switching system is left idle after recovering the fault that occurred for the corresponding line, and reports the recovery fact of the line to the outgoing line switching system. Transmit (1001).

As described above, in accordance with the demand for line occupancy of the outgoing line, various causes, e.g., bilateral switching system, are used in the operation of the relay line which performs line occupancy of the incoming line, transmission of responses thereto, and transmission and reception of data through the occupied line. Unexpected failures occur during normal signal transmission and reception due to failure of the inter-signal processing device, instability of the transmission path, noise, and the like.

At this time, the maintenance operation processor of each country detects the failure on the transmission line and then releases the relay line in order according to the programmed failure handling procedure and manages it as an unserviceable state. Restore to state

In this case, the fault is not always detected correctly at the relay line, and even if it is detected, the fault handling procedures programmed between the two switching systems are different or the relay line status is different from each other, that is, the incoming line at either end of the relay line is available. In this case, the idle state of the non-occupied state is maintained, but the outgoing line side of the other side is managed in a block state of line unavailable, faulty, or closed by the operator.

If this condition occurs, the outgoing line side switching system that attempts to occupy the line does not recognize the out-of-service line as a non-serviceable line in the outgoing line side in the process of searching for the idle state line. Therefore, when a line is occupied for the line, a problem occurs that the service cannot be performed forever.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned general problems, and its object is to operate the R2 relay line signal between stations in one direction. It is intended to eliminate interruptions and to provide efficiency in the use of resources between stations.

1 is a flowchart of an inter-origin line signal during call processing of a conventional inter-office relay line signal;

2 is a flowchart for performing trunk line management between stations according to the present invention.

In order to achieve the above object, the present invention provides a method for managing a trunk line between stations, the process of determining whether a line in a state of no service is present by searching for a relay line accommodated in the station, and requesting the occupation of the line defined by the R2 signaling method to the large station. And analyzing the response signal after transmitting the signal to determine whether the large station is in the relay line serviceable state, and recovering the blocked line to the idle state if the large station is in the relay line serviceable state.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the operation of resolving the inconsistency of the relay line state by managing the R2 relay line between stations, as can be seen in Figure 2, first the outgoing line side exchange system is a relay line accommodated in the country through the operator or other relay line monitoring program The circuit is searched line by line (S101) to determine whether a blocked relay line is detected (S102).

When the blocked relay line is detected, the signal processing bit of the actual power station connected to the corresponding line is checked (S103) to determine whether the blocked corresponding line is an idle line (S104).

If it is determined that the blocked line is an idle line, the test line is required to check the status of the line signal and the state of the station because the state of the relay line and the physical line between the stations is different. It is assumed that the signal is requested to occupy the line to the power station (S105), and then the signal processing bit of the power station detected within a predetermined time period is checked (S106) and is detected as a signal to notify the completion of the occupation of the line. Determine (S107).

If the signal processing bit of the power station is detected as notifying the completion of the occupation of the line within a certain time after requesting the occupation of the line, the corresponding line remains in a normal state. The signal for requesting the recovery of the corresponding line, that is, the idle state signal, is transmitted to the counter side (S108).

As described above, it is determined whether the signal processing bit detected from the power station is detected as the idle state within the predetermined time period after transmitting the idle signal requesting the channel recovery to the power station (S109).

At this time, if it is determined that the signal processing bit detected from the power station is in an idle state, it is determined that the power station is in a state capable of performing normal service. If the occupancy of the line is required, the occupancy of the line is managed.

When it is determined that the signal processing bit from the actual power station identified in step S104 is not in an idle state or the signal for notifying the completion of the occupation of the line is not received for a predetermined time after transmitting the line occupation signal to the power station in step S107. The current line is determined to be in a blocked state and maintains the current state and reports the matter to the higher processor side (S112).

In addition, if it is detected in step S109 that the received signal for the idle signal of the corresponding line transmitted to the power station after receiving the occupied completion signal for the corresponding line is not changed or changed to a signal that is not an idle state signal, the detailed state of the power It is determined that the service is not known correctly, but is not available, and continuously maintains the current state blocked for the current line, and reports the information to the higher processor side (S112).

As described above, the present invention checks and recovers the state of trunk lines between stations based on the transmission and transmission result of the line signaling defined in the trunk line, thus providing efficiency in the use of the limited line by eliminating occurrence of trunk line mismatch between stations. In addition, it provides efficiency in system operation by increasing the utilization of resources for expensive trunk line transmissions.

Claims (2)

In the trunk line management method, Retrieving the relay line accommodated in the local station to determine whether there is a service unavailable state line; Transmitting a line occupancy request signal defined by the R2 signaling method to the counterpart and analyzing the response signal to determine whether the counterpart is in a relay line serviceable state; And repeating the blocked line to an idle state if the large station is in a state capable of relay line service. The method according to claim 1, Determining whether a signal processing bit of a power station connected to the corresponding line is in an idle state when a line blocked in the relay line detected in the process is detected; If the signal processing bit of the power station is in an idle state, the relay line state and the physical line state are different, so as to output an occupancy signal for confirming the state of the power station, and then detecting a response signal received; If it is determined that the response signal received is in a state capable of performing a normal service, transmitting a signal for circuit recovery to the counterpart and detecting a response signal; And if the response signal is detected as being in an idle state, recovering the corresponding line and then reporting the higher processor side to enable the call processing relay.