JPH0314400A - Fault detecting system for sound channel - Google Patents

Abstract

PURPOSE:To rapidly detect the existence of a fault by inserting set data into a down highway control channel after forming a return circuit by a calling processor, extracting return data from the corresponding channel of an up highway and comparing both the data. CONSTITUTION:At the time of receiving a return instruction and a specified channel, a line processor (LPR) 12 supplies channel information to a previously set return circuit 101. The calling processor (CRP) 14 extracts previously set data from a set data storing part 142 and sends the extracted data by a selected specified channel. The CPU 14 extracts the returned data and inputs the extracted data in a return data storing part 141. When the return data are obtained, a collating means 143 discriminates whether the return data coincide with the set data or not, and when both the data are different, suppress the generation of a fault in the sound channel, outputs an alarm, and switches the system. Thus, the generation of a fault in the sound channel can be quickly detected.

Description

[Detailed Description of the Invention] [Summary] Regarding a fault detection method for a voice channel of a digital exchange in which a line concentrator for concentrating a large number of subscriber groups is connected to a network via a network interface, the present invention relates to a method for detecting a fault in a voice channel of a digital switch. The purpose is to provide a voice channel failure detection method that can quickly detect failures, and has a concentrator loop back a designated voice channel on the down highway from the network to a designated voice channel on the up highway using a time switch. When a call processor that controls the network sends a call back instruction to the line processor specifying one channel that is not used for calls, the line processor sends both call back circuits on the specified channel. After connecting between highways, the call processor determines the shape of the return circuit, inserts setting data into the control channel of the downlink highway, extracts return data from the corresponding channel of the uplink highway, and compares the two to determine whether there is a failure. We take precautions to detect. [Field of Industrial Application] The present invention relates to a fault detection method for a voice channel of a digital exchange in which a line concentrator accommodating subscribers is connected to a network via a network interface.

In recent years, digital exchanges have been used to switch and exchange signals that have been digitized and time-division multiplexed.
It became so. In such digital exchanges, digital signals from a large number of subscriber lines are normally processed by a line concentrator.
The network is used efficiently by concentrating the channels by assigning them to fewer channels than the number of subscribers. In conventional digital switching equipment, an interface is provided between the line concentrator and the network that performs switching, and the processor that controls the network (called a call processor) and the processor that controls the line concentrator (called a line processor) are Control signals are exchanged between the network and the interface via a highway that includes a voice channel for telephone calls.

Therefore, failures in the voice channel between the interface and the network can be detected by detecting an abnormality in the control signal (such as a state in which the control signal cannot be received), but failures in the voice channel between the concentrator and the interface could not be detected early. Therefore, it is desired to quickly detect voice channel failures between line concentrators and network interfaces. [Conventional technology FIG. 4 is an explanatory diagram of the conventional technology, and A. B. is a block diagram of a digital exchange. 1 is a diagram illustrating a communication method between a line processor and a call processor; FIG.

In FIG. 4, 40 is a telephone set, 4l is a subscriber circuit, and 4
2 is a line time switch (Lin) that monitors the line concentrator.
e Time Switch: Displayed as LTSW), 43 is a network interface (Displayed as LTSW).
rk Interface: NW IF), 44 is a line processor that controls the line time switch.
45 is a network (represented by R), 45 is a network
: NW), 46 is a call processor (Call Proc) that controls the network and line processor.
essor: expressed as CPR).

LTSW4 2 is a known time switch (equipped with memory,
Writes to the address corresponding to the designated channel and reads in the order of the addresses), and performs the function of time concentration. That is, the signal of the accommodated subscriber is controlled by the line processor 44, for example, to the up-highway HW.
Insert into the channel assigned by O, and connect to the down highway HWI.
Execute processing to extract from the channel allocated above.

The line concentrator is composed of a plurality of LTSWs 42 according to the line concentration ratio, and each LTSW is a mounting unit called a shelf, and together with subscriber circuits and multiplexing/demultiplexing circuits that connect to a certain number of subscriber lines (for example, 120 lines). It is installed. Therefore, if the concentration ratio is n to l, the concentrator is constructed with n shelves.

In addition, each shelf is equipped with a fixed number of subscriber circuits (e.g. for 8 subscribers).
rLine Circuit) cards are provided (for example, 15 cards), and each card has a plurality of (for example, 8
) subscriber circuits are provided. Therefore, one subscriber circuit is represented by a shelf number, an SLC card number, and a circuit number, and is used for monitoring and controlling the subscriber circuit.

Figure 4A. The communication structure of control signals between LPR 44 and CPR 46 in FIG. 4B. This will be explained with reference to.

B. 441 of LPR4 4 is RSM (Rec
eive Signal Memory), 442 is S
SM (Sending Signal Memorial)
), 443 is MPU (MicroProcess
or tlnit), 4 4 4 is L C M (L
ine Control Memory), and CP
461.462 of R46 is 442.4 of LPH respectively
represents SSM and RSM corresponding to 41. Normally, the L P R 4 4 4 subordinate subscriber status is monitored and the information is written to the SSM 4 4 2, and the SSM
It is transmitted from the inserter 432 in the WIF 43 (see A.) on the control signal channel of the highway HWI, and the CPR4
6, the dropper 45 in the network 45 (see A.)
2, extract the control signal and store it in RSM462,
A processing unit (not shown) within the CPR generates a control signal according to the condition, is written to the SSM 461, and is sent to the inserter 4.
51 to the control signal channel of the highway HWO.

This signal is transmitted to the dropper 431 of NWIF43 (see A.).
, and received by the RSM of LPR44. Among the received control signals, those for controlling the LTSW42 are written to the LCM444, from which control signals are sent to each subscriber.

In this conventional configuration, if a failure occurs in the network interface (NWIF) and the voice channel (highway HWO, HWI) between the network, the
．． Either or both of the control signal transmission and reception between the LPR and CPR shown in the figure below become impossible. i.e. CPR or LP
If one side of the H cannot receive a control signal for a certain period of time, it is determined that a fault has occurred in the voice channel (highway), and the fault is detected a short time after the fault has occurred. In that case, if you have a redundant system, you can deal with voice channel failures by switching to a backup system, etc. [The problem that the invention tries to solve! ! ! l] According to the conventional technology described above, if a failure occurs in the voice channel (highway) between the network interface and the line concentrator, that is, if a failure occurs in a highway other than the one used for communication control between LPR and CPR. When this occurs, there is a problem in that it is not possible to early detect obstacles on the up and down highways.

In other words, conventionally, when a voice channel failure occurs between the NWIF and the line concentrator, a subscriber making a call can respond to the failure on either the upstream or downstream side by transmitting voice in one direction. In response to a complaint that the switch is not being used, the operator sends a callback instruction to the relevant subscriber circuit from the test console of the switch. The loop relay is activated to create a loop loop.

By subsequently performing a loopback test, it is determined that there is a problem with the voice channel. As described above, there is a problem in that even if a fault occurs in the voice channel between the network interface and the line concentrator, it takes time and effort to detect it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a voice channel fault detection method that can quickly detect when a fault occurs in a voice channel of an exchange.

[Means to solve the problem] FIG. 1 is a basic structural diagram of the present invention.

In FIG. 1, 10 is a line concentrator, 101 is a return circuit provided in a position corresponding to an unused subscriber circuit in the line concentrator, 11 is a network interface (indicated by NWIF), and 12 is a line processor (LPR). display), 1
3 represents the network (represented by NW), and l4 represents the call processor (represented by CPR). In order to detect a fault in a voice channel between a line concentrator and a network, the present invention specifies a channel for control signals from a call processor and instructs the line processor to call back. A folding circuit installed in an unused circuit can be used as a designated channel, or
When test data is sent from the call processor, it is received by the call processor via the loopback circuit at the line concentrator.
Failures are detected by comparing transmitted and received data.

C action] CPR14 is performed at regular intervals or when necessary6. Try it back! ! *When the operation is activated, a return instruction 144 containing return channel information is sent to IP Rl 2 via the NWIF II through the normal control channel. In this case, one of the control channels from which some of the audio channels L have been deleted is selected as the designated return channel.

In LPR 1 2, when the return instruction and designated channel are taken, the channel for the return same route 101 set in advance is set! Provide In-information. After the callback instruction is sent, the C I) R1 4 retrieves the previously prepared setting data from the setting data storage section 142 and sends it out through the selected specified channel.

In the return circuit 101 of the concentrator, the time switch 102 takes in the data of the corresponding channel, stores it in the bath sofa, and then the time switch 103 sends the content on the designated channel.CPR l 4 takes out the returned data. and input it into the return data storage section 141. Once the return data is acquired,! (q coupling means 143
It is then determined whether the setting data is defeated or not, and if a match cannot be made, it is assumed that a strange voice 1000-nel battle has occurred and a signal III is issued or processing such as system switching is performed. .

[Example] Figure 2 is a configuration diagram of an example. In FIG. 2, 20-0 to 20-n+1 are subscriber circuits SLCSH (SLCSH) forming a line concentrator.
Subscriber Line CJrcuit
Represents O-n + 1 of 22 Pa NWIF
(network interface), 23 represents LPR (line processor), 24 represents network (network), and 25 represents cpR (call processor).

Each SLCSH20-0=20-n+1 represents the LTSW42 that constitutes the cotton collecting device shown in FIG.
A distribution circuit 201 according to the present invention, which includes multiplexing and demultiplexing circuitry, is provided in each subscriber circuit shelf. (In Figure 2!.!, S LC S
Foldback circuit 2 (not shown only in H O, but also included in other shelves) (}1 is an unused SLC card number, circuit number (, this) that is not used for subscriber circuits. 6 Oritsuke,
Further 6 ko, 2nd place 2-, C koi to switch. ．．
The address of the circuit is set in the i-CM (line fan 1/mouth memory) 234 in PR23.

The CPR 2 5 performs voice call return operations at fixed intervals or when instructed. When the loopback operation is started, the CPR 25 selects an unused channel from among the 5 channels for control signals provided in advance in addition to channels for audio signals, and assigns the channel number to the channel number of the loopback circuit. Specify I. ．． Send to PR23. The transmission path of the signal of
Insark 24l of W24, N via Highway HWO
W [F22 no 1/I] It goes through the collar 221.

In L P R 2 3, when the receiver takes this, the LC is
The designated channel number is written in the address 1/pass of the return circuit set in M234, and a calm response signal indicating that reception 1.j has been received is transmitted to the CPR 25.

This transmission route is also performed via the NWIF 22 and NW 24 as in the conventional case. , CPR 25 receives this response signal, takes out test data from a predetermined area of SSM 252, and transmits it to the line concentrator using the specified control signal channel.

In the LPR23, S1 and CS are set so that the LCM234 outputs the specified control signal channel to the return circuit.
Switch the HO time switch 202. As a result, the input data can be stored in the flip-flop circuit (indicated by FF), and then the timing of the channel of the upper reheating switch HWl (same channel as the downlink redirection HWl, but half-sunset The 8-folded signal, in which the data is folded back as it is according to the following (after), is transmitted to the NW 24 via the highway HWI, taken out from the dropper 242, and stored in a predetermined area of the RSM 251 of the CPR 25.

The MPU 253 of the CPR 25 compares the transmitted data with the returned data and determines whether a match is found. If they match, it is determined that there is no abnormality, and if they do not match, it is detected that an abnormality has occurred. do. In this case, predetermined abnormality processing is executed. As part of the abnormality handling process, when the connection system between the NWIF and the line concentrator is duplicated, by executing the process of switching from the active system to the standby system, it is possible to continue the exchange without interrupting the service. The return data is expressed as a signal level in order to clearly identify whether there is an abnormality or not. igh(“1”), Low(“O
It is desirable to use data containing a mixture of ゛゜). In addition, transmission data for return is sent from the network to the NWI.
If the tone data (busy tone, ringing signal tone, silence, etc.) sent to F is used as is, there is no need to reduce the number of voice channels for sending this data.

FIG. 3 is a detailed diagram of the folding circuit within the concentrator.

In the figure, 30 is the unused SLC (subscriber circuit)
card, 301 is a flip-flop circuit (indicated by FF)
, 31 is the downstream call memory (displayed in DSM: low
ward Speech data Me+wory)
, 32 is a time switch, 33 is an uplink communication memory (U
Display in SM: Upward Speech data
Me+sory), 34 represents a time switch.

To explain the operation, only the audio channel (including return data) specified by the LPR (FIG. 2) in the downlink audio channel (downlink highway) is switched by the time switch 32, inputted, and stored in the DSM 3l. The stored data is serially input to the FF 301 bit by bit. The FF 30f latches the data input to the data terminal D every time the audio data latch clock is input to the terminal CP, and the latch output is stored in the USM 33 after half a clock cycle from the terminal Q. The data stored in the U, SM 33 is sent to the upstream audio channel (upstream highway) via a designated channel by the time switch 34.

[Effects of the Invention] According to the present invention, a fault in a voice channel between a network interface and a line concentrator can be detected promptly after the fault occurs, without manual work as in the past. Furthermore, if the connection system between the network interface and the line concentrator is switched to a backup system upon failure detection, service can be continued and the reliability of the exchange can be improved.

10: Line concentrator 101: Return circuit 1l: Network interface NWIF 12: Line processor LPR 13: Network NW 14: Call processor CPR

Claims (1)

[Claims] A line concentrator (10) for concentrating a large number of subscriber groups connects to a network (13) via a network interface (11).
), the line concentrator (10) is equipped with a turn-back circuit that loops back a designated voice channel on the down-highway from the network to a designated voice channel on the up-highway using a time switch. (101), and when the call processor (14) that controls the network sends a callback instruction to the line processor (12) by specifying one channel that is not used for calls, the line processor (12) The call processor connects the loopback circuit (101) between both highways using the designated channel, and after forming the loopback circuit, sets the configuration data (142).
) is inserted into the control channel of the down highway, and the return data (14
1) A voice channel fault detection method is characterized in that the presence or absence of a fault is detected by extracting and comparing the two.