JP3088333B2 - Transmission path control apparatus and 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 transmission line control apparatus and method for controlling transmission characteristic values of a digital PCM transmission line.

[0002]

2. Description of the Related Art FIG. 3 is a sequence diagram showing a conventional transmission characteristic setting operation. FIG.
No. 76, as shown on page 9, line 7 of this publication, the test signal S23 has a frequency fc (eg, 1.5 kHz) near the center of the transmission band and a frequency fe (eg, 1.5 kHz) near the end of the transmission band. 3 kHz), and is transmitted from the slave station with the same amplitude for both frequencies. The signal of the frequency fc is a signal for both measuring the amount of attenuation of the dedicated line and notifying the start of the initialization setting operation of the slave station, and the signal of the frequency fe is a signal for measuring the amount of attenuation in a high frequency band. is there. The frequency fe may be multi-frequency in order to increase measurement accuracy. The master station device transmits the test signal S23
That is, the frequency fc is detected by the signal receiver DET, and the variable gain amplifier AGC is set to a corresponding gain value by referring to the amplifier gain table stored in the ROM based on the power at the frequency fc at that time. Next, the master station device measures the power at the frequency fe, and selects an equalizer characteristic based on the ratio between the measured power and the power at the frequency fc. The master station device outputs an end signal S14 after the end of the selection of the equalizer characteristics.

In this way, a test signal S23 is output,
The transmission characteristic optimization method is performed on the basis of the power ratio at two frequencies, as described above, based on which the other corrects the characteristics of the dedicated line.

[0004]

In the prior art described above, an error in the transmission characteristic value can be recognized only by a failure.
That is, a signal loss (LOS: Loss of Si)
gnal), loss of frame (LOF: Loss of)
Frame), loss of multi-frame (LOMF: L
Oss of Multi Frame) and Cyclic Redundancy Detection (CRC)
Check) Only an error was reported. However, the transmission characteristic setting error described above is usually rare, and the CGA failure at the start of use of the transmission line was considered to be a physical characteristic setting error. Had a problem of not being provided.

[0005] Therefore, an object of the present invention is to automatically reset the cause of a failure that is rarely noticed by a maintenance person and often forgotten due to a rarely possible transmission characteristic setting error when a CGA failure occurs, according to a certain logic. It is an object of the present invention to provide a transmission path control device for performing the above.

It is another object of the present invention to provide a transmission line control method for automatically resetting transmission characteristics.

[0007]

In order to solve the above-mentioned problems, a transmission line control device according to the present invention is connected to a maintenance and operation device and an exchange provided on a transmission line, and is provided with a digital PCM.
The transmission path controller that controls the transmission characteristics of the transmission device on the transmission line analyzes the transmission characteristic value setting request from the maintenance and operation device and determines whether the transmission characteristic value setting request makes an automatic characteristic value request or A characteristic value setting unit for setting characteristic values; a failure detecting unit for checking whether a failure has occurred in a transmission device or a transmission line; and, if a failure has occurred, a transmission device to which of the transmission devices. Optimizing means for judging whether the request is a characteristic value setting request, and a fault reporting means for reporting a fault to the maintenance and operation device in response to a request from the optimizing means and the fault detecting means. It is characterized in that a correct transmission characteristic value is automatically set, and when the automatic transmission characteristic value cannot be automatically set, a given transmission characteristic value is set.

When an automatic characteristic value request is issued from the characteristic value setting means, the optimizing means judges the failure information from the failure detecting means to find a transmission characteristic value of the transmission device in which no failure occurs, and It is preferable to set the transmission characteristic value of the transmission device in which the error does not occur to the transmission device in which the failure has occurred.

Further, it is preferable that the transmission characteristic value of the transmission device having no failure has an initialization characteristic value flow file list written corresponding to the transmission device having no failure.

Further, it is preferable that a time for which the failure detecting means detects a failure is set by a timer.

If the failure detection means does not detect a failure, it is preferable that the failure reporting means reports the failure to the operation and maintenance device and terminates the processing.

Further, when the failure is detected by the failure detecting means, any one of a signal loss, a frame loss, a multi-frame loss, and a cyclic redundancy detection error, which are failures in the digital PCM transmission path, is determined. Is preferred.

Further, when the failure is a loss of signal, it is preferable to report to the maintenance and operation equipment that the processing has been completed.

When the failure is a frame loss or a cyclic redundancy detection error, it is preferable to determine whether the digital PCM is a primary group based on the format of the initialization profile list.

Further, when the frame loss or the cyclic redundancy detection error is a digital PCM primary group, the unfailed profile for all combinations of the transmission code and the number of multiframes depends on whether 1.5 Mbit / sec or 2 Mbit / sec. It is preferable to create a list and to use the values of the initialization characteristic value profile list for characteristic elements other than the transmission code and the number of multiframes.

Still further, when the failure is a loss of a multi-frame, it is preferable to determine whether or not the digital PCM is a primary group based on the format of the initialization profile list.

If the loss of the multi-frame is a digital primary group, an unfailed profile list for all combinations of the number of multi-frames is created based on whether the multi-frame loss is 1.5 Mbit / s or 2 Mbit / s. It is preferable to use the values of the initialization characteristic value profile list for the characteristic elements other than the number.

Furthermore, it is preferable that the unfailed profile list is two or more types of undisturbed profile lists having different times until the profile is created.

Further, the transmission path control method of the present invention is a transmission path control method for controlling transmission characteristics of a digital PCM transmission path transmission apparatus by a maintenance operation apparatus and an exchange provided on the transmission path. Analyzing the transmission characteristic value setting request of the above, whether the transmission characteristic value setting request makes an automatic characteristic value request, or whether there is a characteristic value setting step of directly setting the characteristic value to the transmission device, and whether there is a failure in the transmission device or transmission line A failure detection step for checking whether or not there is a failure, an optimization determination step for determining to which of the transmission devices the characteristic value setting request is made, and a failure detection by the optimization determination step and the failure detection step. A failure report step of reporting a failure report to the maintenance and operation equipment. If a failure occurs, the correct transmission characteristic value is automatically set. If not and sets the transmission characteristic values given.

In particular, the present invention relates to a transmission path control device for controlling the transmission characteristics of a transmission device, which utilizes a fault that occurs when setting the transmission characteristics to the transmission device to determine whether or not the transmission characteristics are set incorrectly. And a means for automatically setting a correct transmission characteristic value when a failure occurs, and setting the transmission characteristic value with a given transmission characteristic value when automatic setting is not possible. More specifically, a characteristic value setting means for receiving and setting a transmission characteristic value from a transmission line maintenance operation device, a failure detection means for detecting a failure in the transmission path, an optimization means for optimizing the characteristic value, And reporting means for reporting to the maintenance operation device. With such a configuration, the transmission characteristic value setting request is received by the characteristic value setting unit from the maintenance operation device, and if the request is an automatic setting request, the optimization unit determines the failure information from the failure detection unit and a failure occurs. A transmission characteristic value not to be used is found, and the found transmission characteristic value is set in the corresponding transmission device, and the effect is reported to the maintenance and operation device by the reporting means.

For this reason, the transmission characteristic values of various transmission devices are correctly set.

[0022]

Next, an embodiment of the present invention will be described.
This will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the transmission line control device of the present invention. This device is connected to the maintenance operation device 4 and the exchange 3 provided on the transmission path.
Transmission devices 31, 32, 33 connected to the exchange 3
Can provide digital PCM transmission lines having various characteristics depending on what kind of digital PCM transmission line is used for connection, depending on the transmission code, the number of multiframes, and whether the transmission line signal line system is individual or common.

The transmission path control device 1 of the present invention includes a characteristic value setting unit 13, a transmission line failure detection unit 14, a failure reporting unit 12, and a characteristic value optimizing unit 11. The characteristic value setting means 13 analyzes a request from the maintenance operation device 4 and makes an automatic characteristic value request to the optimizing means 11 or sets a characteristic value directly to the transmission devices 31, 32 and 33. In addition, the characteristic value is written to the initialization characteristic value flow file list corresponding to the transmission device through the optimizing unit 11. The failure detecting means 14 includes the transmission devices 31, 32, 33
Check whether there is a failure in the transmission line or a failure in the transmission path. The failure reporting unit 12 reports a failure to the maintenance and operation device 4 in response to a request from the optimizing unit 11 or the failure detecting unit 14. The optimizing means 11 includes transmission devices 31, 32, 3
3 to which transmission device the characteristic value setting request is determined,
The transmission characteristic value is set in the corresponding transmission device. At this time, the presence or absence of a failure is determined by knowing from the failure detection means 14 whether or not a failure has occurred in the transmission path. If a failure has occurred, the optimum characteristic value of the transmission device is found and set.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 2 is a flowchart showing the operation of the transmission path control device of the present invention. First, in FIG. 1, a transmission characteristic value setting request from the maintenance operation device 4 is received by the characteristic value setting means 13 and the request is transmitted to the initialization characteristic value profile list 1.
5 is stored. If the request is not an automatic setting request, the characteristic value setting means 13 determines which of the transmission devices 31, 32, and 33 is the transmission device, and sets the transmission characteristic value in the corresponding transmission device. If the request is an automatic setting request, the optimization unit 11 is requested to set an automatic characteristic value. The optimization means 11
By this automatic characteristic value setting request, a request is made to the characteristic value setting means to set the characteristic value in the initialization characteristic value profile 15 to the corresponding transmission device (step S1). Next, the timer is started, and a time-out (about 15 seconds) is waited until a failure is reported from the failure detecting means 14 (steps S3 and S4). At this time, if there is no failure, the processing is terminated and reported to the maintenance operation device 4 (step S9). If a failure occurs, LOS (Loss Of Signa)
l), LOF (LossOf Frame), LO
MF (Loss Of Multi Frame)
CRC (Cyclic Redundance Che)
ck) (S5, S6, S7). If an LOS occurs, the connection cable may be disconnected, so the process is terminated and reported to the maintenance and operation device 4 (steps S9 and S15). L
When the OF or CRC occurs, if the digital PCM primary group is used, a profile list for setting the characteristic values of the transmission code and the number of multi-frames is created for all combinations according to 1.5 MBPS or 2 MBPS. For other characteristic elements, the values of the initialization characteristic value profile list 15 are used. If it is not the digital PCM primary group, the process is terminated and reported to the maintenance operation device 4 (steps S9 and S15). Digital P
The determination as to whether or not it is the primary CM group is made based on the fact that the form of the initialization characteristic value profile list 15 is different (step S11). At the time of LOMF generation, if it is a digital PCM primary group, 1.5 MBPS (megabits / second) or 2 MBP
A profile list for setting the characteristic value of the number of multiframes is created for all combinations according to S (megabits / second) (12 or 24 for 1.5 MBPS, 2 or 16 for 2 MBPS). For other characteristic elements, the values of the initialization characteristic value profile list 15 are used. If it is not the digital PCM primary group, the processing is terminated and reported to the maintenance operation device 4 (steps S9 and S1).
5). The determination as to whether or not the digital PCM is the primary group is made based on the fact that the form of the initialization characteristic value flow file list 15 is different (step SlO). By judging a failure in this way, the total number of all profile lists can be reduced, and time until the end of optimization can be saved. If there is at least one created profile, a request is made to the characteristic value setting means 13 for setting a characteristic value of the profile created for the corresponding transmission device, and the timer is timed out (about 15 seconds). Wait for a failure to be reported from the failure detection means 14 (step S
3, S4). If a failure has occurred, the flow file is deleted from storage, and the characteristic value of the next profile is set (step S8). If there is no next profile, an unfailed profile list 16 of the unfailed profile is created (step S12). Here, the opposite exchange 2
In the same way, if the characteristic values of the transmission device are optimized, a correct unfailed profile list cannot be created.
After a random time (approximately between 1 and 5 minutes),
The same is done again to create the non-failure profile list 17 (step S13). End failure file list is 2
When one is created, an element having a large number of values for each characteristic element including the initialization characteristic value profile 15 is adopted as a characteristic value. The characteristic value is optimized in this way, the optimized characteristic value is set in the corresponding transmission device, the processing is completed, and the result is reported to the maintenance operation device 4 (step S15).

Next, a second embodiment of the present invention will be described with reference to FIG.

In step S14 of FIG. 2, the optimization of the characteristic value is performed by the timeout of the timer in step S2 (about 1).
5 seconds). However, in this case, the longer the number of profiles, the longer the optimization takes. Therefore, a timer value (about 8 seconds) for the unfailed profile list 16 and a timer value (about 15 seconds) for the unfailed profile list 17 are separately provided to reduce the time required for optimization. That is, in step S2 in FIG. 2, if the initial characteristic value is set, the timeout value is about 15 seconds, if the unfailed flow file list 16 is created, the timeout value is about 8 seconds, and if the unfailed profile list 17 is created. The timeout value is about 15 seconds.

[0029]

According to the transmission path control device of the present invention, a failure report generated due to a characteristic value error of a digital PCM transmission device can be determined as an error in the revised value, and a correct set value can be set. Therefore, there is an effect that the transmission characteristic value of the digital PCM transmission device can be correctly set without human intervention.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a sequence diagram showing an operation of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission-path control apparatus 2 Switching device 3 Switching device 4 Maintenance operation device 11 Optimization means 12 Failure reporting means 13 Characteristic value setting means 14 Failure detection means 15 Initialization characteristic value profile list 16 Unfailed profile list 17 Unfailed profile list 21,22 Transmission equipment 31, 32, 33 Transmission equipment 34 Subscriber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 3/46 H04M 3/22 H04M 7/00

Claims (13)

(57) [Claims] 1. A transmission line control device connected to a maintenance operation device and an exchange provided on a transmission line and controlling transmission characteristics of a transmission device of a digital PCM transmission line, wherein a transmission characteristic value setting request from the maintenance operation device is provided. Analyze
Whether the transmission characteristic value setting request makes an automatic characteristic value request,
Alternatively, characteristic value setting means for directly setting characteristic values to the transmission device, failure detection means for checking whether a failure has occurred in the transmission device or the transmission line, and when the failure has occurred, Optimizing means for determining which transmission device among the transmission devices is a characteristic value setting request; and a request from the optimizing unit and the failure detection unit, for reporting the failure report of the failure to the maintenance operation device. A transmission line control device, comprising: automatically setting a correct transmission characteristic value when the failure occurs; and setting the transmission characteristic value by a given transmission characteristic value when the automatic setting cannot be performed. . 2. When the automatic characteristic value request is issued from the characteristic value setting means, the optimizing means judges the failure information from the failure detecting means and determines the transmission characteristic value of the transmission device in which no failure occurs. 2. The transmission path control device according to claim 1, wherein a transmission characteristic value of a transmission device in which the failure does not occur is set to the transmission device in which the failure has occurred. 3. The transmission characteristic value of the transmission device in which the failure does not occur has an initialization characteristic value flow file list written corresponding to the transmission device in which the failure does not occur. The transmission path control device according to 1. 4. The transmission path control device according to claim 1, wherein a time period in which the failure detecting means detects the failure is set by a timer. 5. The apparatus according to claim 1, wherein when the failure detecting means does not detect the failure, the failure reporting means reports the failure to the maintenance operation device and terminates the processing.
5. The transmission line control device according to any one of claims 1 to 4. 6. A failure of the digital PCM transmission line when the failure detection means detects the failure.
Signal loss, frame loss, multi-frame loss,
The transmission path control device according to any one of claims 1 to 4, wherein one of the error and the cyclic redundancy detection error is determined. 7. The transmission path control device according to claim 6, wherein when the failure is a loss of the signal, the maintenance operation device is notified of the end of processing. 8. The method according to claim 6, wherein when the failure is the loss of the frame or the cyclic redundancy detection error, it is determined whether the digital PCM is a primary group based on the format of the initialization profile list. The transmission path control device according to 1. 9. When the frame loss or the cyclic redundancy detection error is the primary group of the digital PCM,
A non-failed profile list for all combinations of the transmission code and the number of multiframes is created according to whether the transmission code and the number of multiframes are 5 Mbit / sec or 2 Mbit / sec. 9. The transmission line control device according to claim 8, wherein the value of the list is diverted. 10. When the failure is the loss of the multi-frame, according to the format of the initialization profile list,
7. The transmission path control device according to claim 6, wherein it is determined whether the digital PCM is a primary group. 11. In the case where the loss of the multi-frame is the digital primary group, an unfailed profile list for all combinations of the number of multi-frames is created according to whether the loss is 1.5 Mbit / s or 2 Mbit / s. 2. The characteristic element other than the number of multiframes uses the value of the initialization characteristic value profile list.
0. The transmission path control device according to 0. 12. The non-failed profile list is at least two types of undisturbed profile lists having different times until the list is created.
2. The transmission path control device according to 1. 13. A transmission line control method for controlling transmission characteristics of a transmission device of a digital PCM transmission line by a maintenance operation device and a switch provided on a transmission line, wherein a transmission characteristic value setting request from the maintenance operation device is analyzed. And
Whether the transmission characteristic value setting request makes an automatic characteristic value request,
Alternatively, a characteristic value setting step of directly setting a characteristic value to the transmission device; a failure detection step of checking whether there is a failure in the transmission device or the transmission line; An optimization determining step of determining which of the transmission devices is a characteristic value setting request, and a failure reporting step of performing a failure report on the failure by the optimization determining step and the failure detecting step to the maintenance operation device, A transmission path control method comprising: automatically setting a correct transmission characteristic value when a failure occurs; and setting the transmission characteristic value with a given transmission characteristic value when automatic setting is not possible.