JPS6142476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to stand-alone control in a remote subscriber concentrator connected to a master station via a time-division transmission line.

In general, a remote subscriber line concentrator has only a simple function of receiving information necessary for control from a master station and controlling the opening and closing of a line concentrator switch based on that information. Therefore, if communication with the base station is interrupted due to a line failure between the base station and the remote subscriber line concentrator, call connection operations within the same remote subscriber line concentrator, in other words, even standalone operation, will not be possible. Can not. Therefore, the processor that is the control unit of the remote subscriber line concentrator should be configured with a processor with large processing capacity, so that it can perform the processing that is performed at the master station, such as channel blockage management, subscriber data retention, and updating. However, since such a processor is provided for each remote subscriber concentrator, it is not economical to use a large processor.

In view of this problem, the present invention allows a remote subscriber line concentrator to be controlled using a processor with a small processing capacity, such as a microprocessor, and enables stand-alone control.

That is, a switching system is installed in a remote location, a concentrator and a master station are connected by a time division transmission line, and a control device in the concentrator is equipped with means for transmitting and receiving control signals, etc., to and from the master station. In the autonomous processing control device provided on the concentrator side of the time-division transmission path, a first transmitting/receiving means for transmitting and receiving control signals to and from the master station side via the time-division transmission path; A second transmitting/receiving means for transmitting and receiving control signals to and from a control device in the line concentrator is provided, and a second transmitting/receiving means for transmitting and receiving control signals to and from a control device in the line concentrator is provided, and a second transmitter/receiver is provided that transmits and receives control signals from the master station side via the time-division transmission line. The first transmitting/receiving means receives user data and stores it in the memory within the autonomous processing control device, while the autonomous processing control device receives data approximately regularly using the first transmitting/receiving means. Data for diagnosing the transmission path is transmitted, and the return data of the diagnostic data is received by the first transmitting/receiving means via the master station to confirm the normality of the transmission path, and the return data is received for a predetermined period of time. If it is not returned, the autonomous processing control device determines that a failure has occurred in the transmission path,
The second transmitting/receiving means transmits and receives control signals on the line concentrator side, and performs exchange control on behalf of the master station based on subscriber data sent and stored from the master station. .

The present invention will be explained in more detail below with reference to the drawings.

Figure 1 shows a conventional example, where A and B are subscribers,
RLC is a remote subscriber line concentrator, LPR is a line concentrator, D/I is a dropper inserter,
DT ₁ and DT ₂ are digital terminals, which are carrier devices for adapting to the signal format of the transmission line connecting the remote subscriber line concentrator and the master station.

NW is a time division network of the master station, and CPR is a call processing control device. For details of the remote subscriber line concentrator, please refer to the previously filed patent application filed in 1983.
It is introduced in Figure 1 of 96063, and the explanation is omitted here. Also, regarding the signal format used between the remote subscriber line concentrator and the master station, the signal format for one frame is
Shown as SF. This signal SF is sent to the frame synchronization section F, the data link section DL for exchanging control signals, etc., and the channel CH ₁ to which the speech signal is assigned.
~ It is composed of CH _o . The operation in such a system is as follows. The line concentrator LPR monitors the subscribers accommodated in the line concentrator RLC. For example, when subscriber A is in a calling state, it is detected and the dropper inserter D/I
The call status of subscriber A is inserted into the uplink data link DL through the link. The call processing control device CPR of the parent station learns of the call origination of subscriber A from the information of this data link DL, extracts the class information of subscriber A from the subscriber memory that stores subscriber information (not shown), and joins the DP. or PB subscriber. If it is a DP subscriber, it is sent to the remote subscriber concentrator using the downlink data link DL along with the assigned call channel information.

In the remote subscriber line concentrator, the data link DL signal is taken into the line concentrator LPR from the drop pin inserter D/I, and it is learned that subscriber A is a DP subscriber. Therefore, the line concentrator LPR controls sending a dial tone signal to the subscriber A, and counts dial pulses using the subscriber line scanning means.

This count result is notified to the call processing control device CPR of the parent station via the uplink data link DL through the dropper inserter D/I.

The call processing control device CPR performs numerical analysis, and as a result, if the called party is, for example, subscriber B, information about the called party B is extracted from the subscriber memory (not shown) and the busy information is extracted. obtain. If it is empty, subscriber B will inform the user via the downlink data link DL.
A notification is sent to the remote subscriber concentrator in which the subscriber B is accommodated, and the call signal is sent to the called subscriber B. At this time, one of the idle communication channels is selected and its assigned channel information is notified to the remote subscriber concentrator via the data link DL.

Thereafter, when called subscriber B responds, a call is made using the assigned channel through the call path via the master station. Also, when the caller is busy, busy information is sent via the data link DL, and a busy tone is sent to caller A.

On the other hand, if subscriber A is a PB subscriber, the call processing controller CPR of the master station allocates an empty channel, notifies the remote subscriber concentrator, and uses that channel to receive the PB signal at the master station. After that, the same process as the control for DP subscribers is performed.

The call termination status of both subscribers A and B is monitored by the line concentrator LPR, and when either subscriber clicks on, the parent station is notified of this via the data link DL, and the parent station Ends the call based on the command.

As mentioned above, the information necessary for call processing is held in the master station, and the line concentrator LPR operates based on instructions from the master station.
A microprocessor can be used as LPR.
However, with the above configuration, if a line failure occurs between the remote subscriber line concentrator and the master station, mutual communication becomes impossible, and even if the remote subscriber line concentrator can operate normally, it cannot perform its functions.

FIG. 2 shows an embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate the same functions. Others APR is an autonomous processing control device. Here, the signal exchange and control method between the remote subscriber line concentrator and the master station are the same as in FIG.

However, the call processing controller CPR of the master station uses the data link DL to communicate with the autonomous processing controller APR.
The subscriber data regarding the remote subscriber line concentrator is transferred to the remote subscriber concentrator periodically (or when necessary).

The autonomous processing control device APR stores received subscriber data in a memory (not shown), and when communication becomes unavailable due to a failure in the transmission path between the remote subscriber concentrator and the master station, the autonomous processing control device equipment APR
uses subscriber data stored in memory to perform processing in place of the call processing control device CPR of the parent station.

However, this process is only related to interconnection within the remote subscriber line concentrator, and calls to other stations or to the parent station are all busy processes.

FIG. 3 shows this detailed configuration.

In the figure, the same symbols as in Figure 2 indicate the same functions,
MPU is a microprocessor, SSM is a control information transmission memory, RSM is a control information reception memory, TG is a timing generator, LA is an LPR-APR mutual communication circuit, RSMS is a standalone control information reception memory, SSMS is a standalone control Information transmission memory, TNG is tone generator, CM is control memory,
REC is a PB signal receiver, TSW is a time division switch,
FM is file memory, I is inserter, and D is dropper.

Regarding the line concentrator LPR, only the related circuits using the data link _DL explained in _FIG . When sending call detection information, the caller number (accommodation location information) and off-hook information are used as data, and a check bit is added at the end.

The contents of the control information transmission memory SSM1 are transmitted into the uplink data link DL via the inserter _I1 at the timing from the timing generator TG1. The response information from the master station in response to this is
It is sent back on the downlink data link DL, but this data link DL is transmitted by the timing generator TG.
The control information is written to the control information receiving memory RSM ₁ via the dropper D at the timing from 1. A sequence number is added to the beginning of this response information, and the response information that matches the sequence number previously sent from the line concentrator LPR becomes the corresponding response information. However, the data following this sequence number, for example, is given the subscriber number and the assigned channel number for it, but is also given the identification number of whether it is the concentrator LPR or the autonomous processing control device APR. In fact, when this identification number indicates the line concentration controller LPR, the line concentration controller LPR performs necessary processing as response information only if the sequence numbers match. On the other hand, the autonomous processing controller APR also uses the timing from the timing generator TG ₂ to generate a dropout.
The contents of the downlink data link DL are loaded into the control information reception memory RSM ₂ via _D4 , and if this data link DL contains the identification number of the own device, the processor MPU reads it according to the contents. ₂ works. That is, the autonomous processing control device APR receives subscriber data (PB/DP distinction,
Class information for Special Class A, Class A, etc., how to form representative groups, etc.) and translator information (relationship between phone number and storage location, etc.) will be sent. Therefore, this information is sent to the control information receiving memory by processor MPU ₂ .
Read from RSM and stored in file memory FM.

Furthermore, diagnostic data from the processor MPU ₂ is entered into the control information transmission memory SSM ₂ along with a sequence number almost regularly, for example every 10 minutes, and the data is sent via the inserter I ₄ according to the timing from the timing generator TG ₂ . It is sent to the master station on link DL. In addition, to avoid collision with data from control information transmission memory SSM ₁ , the mutual communication circuit
Information is exchanged between the processors MPU ₁ and MPU ₂ by LA ₁ and LA ₂ , and this diagnostic data is loaded onto the data link DL only when there is no data to be transmitted in the control information transmission memory SSM ₁ .

That is, data transmission from the control information transmission memory SSM ₁ is prioritized.

In this way, the diagnostic data sent to the master station is determined to be diagnostic at the master station, and the sequence number and
Diagnostic data will be returned along with your APR number. This is received by the control information receiving memory RSM ₂ , and the processor MPU ₂ knows that it is a response for diagnosis.
However, if this response is not returned even after waiting for a certain period of time, for example, several minutes, it is assumed that there is a failure on the transmission path (including the digital terminal) between the master stations. As a result, the autonomous processing control device APR performs standalone processing. That is, before transitioning to standalone processing, droppers D ₂ to D ₄ and inserters I ₂ and I ₃ passed all signals, and only inserter I ₄ transmitted control information only when necessary data was loaded onto the data link DL. The information from the sending memory SSM ₂ was being sent. However, when transitioning to standalone processing, the operation of the line concentrator LPR does not change, but the autonomous processing controller APR receives standalone control information from data link DL information via dropper D ₂ under the control of timing generator TG ₂ . Always import into memory RSMS.

Therefore, the processor MPU ₂ reads the contents of the control information receiving memory RSMS, and when detecting call information, reads the information of the corresponding subscriber from the file memory FM. As a result, if the subscriber is a DP subscriber, that fact is written in the stand-alone control information transmission memory SSMS, and one of the communication channels is selected, and the channel information is also written. The contents of the standalone control information transmission memory SSMS with the same sequence number and LPR number sent from the line concentrator LPR along with this information are inserted into the inserter.
It is sent back to the concentrator LPR via _I2 .

On the other hand, the processor MPU ₂ writes control information for the selected communication channel, that is, the assigned channel, into the control memory CM. As a result, the dial tone from the tone generator TNG passes through the switch TSW, the inserter _I3 , and the line concentrator LPR.
sent to. The line concentrator LPR sends this dial tone to the calling subscriber. Next, when the line concentrator LPR detects the start of dialing, it notifies the processor MPU ₂ of this via the data link DL via the SSM ₁ -I ₁ ⊂ -D ₂ -RSMS route.

In response to this notification, processor MPU ₂ rewrites the contents of control memory CM and stops sending dial tones from tone generator TNG.

As mentioned above, in the line concentrator LPR,
When the reception of the dialed digits is completed, this numeric information is sent to the standalone control information reception memory RSMS via the data link DL, and then sent to the processor.
MPU ₂ obtains the called party information from the contents of file memory FM.

As a result, if the called party is out of the control of the line concentrator LPR or is busy, the processor MPU ₂ notifies the line concentrator LPR of this fact and also stores information in the control memory.
Write control information to the CM and send a busy tone from the tone generator TNG to the previously used communication channel. The line concentrator LPR controls sending this busy tone to the calling party. Further, if the called party is within the jurisdiction of the line concentrator LPR and is free, the called party is assigned an empty channel and the line concentrator LPR is notified of this. At this time, processor MPU ₂ rewrites the contents of control memory CM,
A tone generator is added to the call channel assigned to the caller.
Includes ringtone from TNG.

Therefore, the line concentrator LPR uses a circuit (not shown) to send a ringing signal to the called party, while sending a ringing tone to the calling party. When the called party answers, the line concentrator LPR notifies the processor MPU ₂ of the called party response information and stops sending out the paging signal. In response to this notification, the processor MPU ₂ stops sending out the ringing tone and writes the communication channel information assigned to the called party and the calling party in the control memory CM.

The line concentrator LPR also places the called party's voice signal on the communication channels assigned to the called party and the calling party, which have been received first. Therefore, the voice signal of the called party is transmitted through the inserter I ₁ , the dropper D ₂ , and the dropper D ₃ by the respective communication channels (uplinks).
We arrive at Switch TSW.

In the switch TSW, the control memory CM converts the call channel, and the called party's voice signal is transferred to the call channel assigned to the calling party, and conversely, the calling party's voice signal is transferred to the call channel assigned to the called party. You can be transferred to another place. Thereafter, it is sent to the line concentrator RLC via the inserter I ₃ , inserter I ₂ , and dropper D ₁ . In the line concentrator RLC, signals of communication channels (downlinks) assigned to the called party and the calling party, respectively, are distributed to the called party and the calling party, respectively, under control from the line concentrator LPR.

When the calling party is a PB subscriber, the difference is that the dial signal is received by the PB signal receiver REC of the autonomous processing control device APR.

When the call between the called party and the calling party ends, the line concentrator LPR notifies the autonomous processing control device APR of this fact, and disconnects the call pulse based on a command from the autonomous processing control device APR. In this way, stand-alone operation is performed, but even during the stand-alone operation,
Control information reception memory RSM ₂ , control information transmission memory
SSM ₂ has been used to communicate with the aforementioned master station, and once communication with the master station is established, stand-alone operation is stopped and control of call processing is handed over to the master station.
As mentioned above, processor MPU ₁ is almost unchanged from conventional control, and processor MPU ₂ usually does not need to independently update subscriber data, etc., and simply receives data from the master station. Therefore, it is sufficient to have a processing function for only the subscribers accommodated by the line concentrator RLC in the master station function only in the limited case of standalone operation, and the processing load on these processors MPU ₁ and MPU ₂ is small and the microprocessor This can be fully realized. Further, other devices in the autonomous processing control device APR are only necessary for call processing during stand-alone operation, and these devices are also small-scale, so that the price increase due to the autonomous processing control device APR itself is small.

[Brief explanation of the drawing]

FIG. 1 is a conventional example, FIG. 2 is an embodiment of the present invention,
FIG. 3 is a detailed view of FIG. 2. In the figure, RLC is a line concentrator, LPR is a line concentrator, CPR is a call processing controller, DT is a digital terminal, APR is an autonomous processing controller, SSM is a control information transmission memory, RSM is a control information reception memory,
CM is control memory, FM is file memory, RSMS
is standalone control information reception memory, SSMS
is standalone control information transmission memory, TSW
is a time division switch, and MPU is a microprocessor.

Claims (1)

[Claims] 1. In a switching system in which a line concentrator installed in a remote location and a master station are connected by a time-division transmission line, and a control device in the line concentrator is equipped with a means for transmitting and receiving control signals, etc. with the master station side. , an autonomous processing control device provided on the concentrator side of the time-division transmission path includes a first transmitting/receiving means for transmitting and receiving control signals to and from the master station via the time-division transmission path; A second transmitting/receiving means for transmitting and receiving control signals to and from a control device in the line concentrator is provided, and a second transmitting/receiving means for transmitting and receiving control signals to and from a control device in the line concentrator is provided, and a second transmitter/receiver is provided that transmits and receives control signals from the master station side via the time-division transmission line. The first transmitting/receiving means receives user data and stores it in the memory within the autonomous processing control device, while the autonomous processing control device receives data approximately regularly using the first transmitting/receiving means. Data for diagnosing the transmission path is transmitted, and the return data of the diagnostic data is received by the first transmitting/receiving means via the master station to confirm the normality of the transmission path, and the return data is received for a predetermined period of time. If it is not returned, the autonomous processing control device determines that a failure has occurred in the transmission path,
The second transmitting/receiving means transmits and receives control signals on the line concentrator side, and performs exchange control on behalf of the master station based on subscriber data sent and stored from the master station. Remote subscriber line concentration control system.