KR100439856B1 - Method of Managing DM Bus in the Exchange - Google Patents

Abstract

The present invention relates to a DM bus management method in an exchange that implements a loop-back function on a DM bus at an exchange to provide a DM bus structure capable of real-time self-diagnosis.

The method includes allocating a unique time slot area to the master and each slave device by separating a data transmission / reception channel between the master and each slave device; Setting up a loop back path that the master and each slave device can receive again after transmitting data through their respective transmission channels; Receiving data through the set loop back path after transmitting data in each allocated time slot region; Comparing the transmission data with a destination address of the reception data to determine whether the reception data is loop backed data; And if the received data is loop backed data, comparing the transmitted data with the looped back data to search for an error.

Description

How to Manage DM Bus in Exchange {Method of Managing DM Bus in the Exchange}

The present invention relates to a DM bus management method in an exchange, and more particularly, to a DM bus management method in an exchange that implements a loop-back function to provide a DM bus structure capable of real-time self-diagnosis.

In general, in a communication between a master device and a plurality of slave devices at an exchange, the communication scheme itself uses a DM bus having a bus structure in which time division multiplexing (TDM) is used. Could not support back offer function.

Then, looking at the structure of the DM bus in the conventional exchange, as shown in Figure 1, the DM bus transmits and receives data based on the time slot, the DM bus master 11 is a synchronization signal (FRS), Transmit clock signal CLK and transmit data TXD and receive receive data RXD, and each slave device 12-1 to 12-n is configured to transmit or receive data in an assigned time slot. .

Here, n corresponding time slots are provided between synchronization signals (FRS) based on a specific bit per second (BP), and the number of time slots allocated to each slave device 12-1 to 12-n is variable. to be.

The synchronization signal FRS is a signal supplied to each slave device 12-1 to 12-n on the DM bus by the DM bus master 11 for synchronization of a DM bus operated based on a time slot. The clock signal CLK is a signal supplied by the DM bus master 11 to each slave device 12-1 to 12-n on the DM bus and is serial data of a DM bus operated based on a time slot. It is a clock signal for transmission and variable, and the corresponding transmission data TXD is data transmitted from the DM bus master 11 to each slave device 12-1 to 12-n, and the corresponding reception data RXD is Data received from each slave device 12-1 to 12-n to the DM bus master 11 is supplied at a timing as shown in FIG.

The operation on the DM bus having the configuration as described above is as follows.

It is composed of one master 11 and a plurality of slave devices 12-1 to 12-n, and the master 11 supplies a synchronization signal FRS and a clock signal CLK on a DM bus. The bus pre-assigns a time slot area by appointment between the master 11 and the plurality of slave devices 12-1 to 12-n, and the master 11 and the specific slave device 12 within the area of the specific time slot. Data transmission and reception is performed between -1 to 12-n).

For example, as shown in FIG. 3, the first slave device 12-1 is allocated an area A to perform data transmission and reception with the master 11, and the second, third, and fourth slave devices 12. -2 to 12-4 are similarly allocated to the B, C and D regions to perform data transmission and reception with the master (11).

The master 11 can receive all time slots, and when transmitting, data can be transmitted to the area time slots of the slave devices 12-1 to 12-n to be transmitted.

As described above, there are always two media that can transmit / receive using the area time slots of the slave devices 12-1 to 12-n, that is, the master 11 and the corresponding slave devices 12-1 to 12. -n) send and receive data with the same area. For example, in area A, the master 11 and the first slave device 12-1 may transmit and receive data together.

However, when the slave device or the master attempts to monitor the data transmitted by looping back, the data transmission from another medium is present on the same channel and is damaged by the overlapping of data. Therefore, loopback is performed to perform self-diagnosis. It was difficult to do, but it had a disadvantage that it could not be implemented without separate logic.

In other words, when data is transmitted / received in the scheduled time slot area between the master and the specific slave device, the media capable of transmitting and receiving data through the specific area are the master and the corresponding slave devices, which are viewed from the viewpoint of the master or the specific slave device. When the loop data is monitored by looping back at the same time, the loop back data and the master transmission data have the same paths, and unless special logic is added, damage due to the overlap of the two data cannot be avoided. Cannot provide real-time self-diagnostics, which makes it a weak point in terms of the reliability of the DM bus.

In order to solve the problems as described above, the present invention provides a DM bus structure capable of real-time self-diagnosis by implementing a loop back function that can not be conventionally supported in the structure using a DM bus, the bus itself in real time It is possible to determine whether the transmission / reception function is normal on the self-diagnostic function, thereby improving the reliability and maintenance of the DM bus, and its purpose is to.

In addition, the present invention provides a real-time self-diagnostic function by enabling a separate loop back channel by implementing different time slot allocation schemes between master and slave boards in a structure using a DM bus.

In addition, the present invention, in the structure using the DM bus, the data transmission and reception channel with the master in common, and assigns a separate loop back time slot to each slave device, in addition to the transmission and reception function with the master in real time By looping back and allowing the self to receive, it is possible to diagnose the transmission / reception function on the DM bus in real time to increase the reliability on the DM bus.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing the structure of a division multipex (DM) bus in a conventional exchange.

FIG. 2 shows timing for signals on a DM bus in FIG. 1; FIG.

FIG. 3 is a view for explaining a DM bus time slot allocation method in FIG. 1; FIG.

4 is a flowchart illustrating a DM bus management method in an exchange according to an embodiment of the present invention.

FIG. 5 is a diagram showing an IPC structure of a DM bus in FIG. 4; FIG.

FIG. 6 is a view for explaining a DM bus time slot allocation scheme in FIG. 4; FIG.

7 is a diagram illustrating a time slot allocation in comparison with a conventional time slot operation scheme according to an embodiment of the present invention.

In the switch according to an embodiment of the present invention for achieving the above object, the DM bus management method allocates a unique time slot area to the master and each slave device by separating data transmission / reception channels between the master and each slave device. Process of doing; Setting up a loop back path that the master and each slave device can receive again after transmitting data through their respective transmission channels; Receiving data through the set loop back path after transmitting data in each allocated time slot region; Comparing the transmission data with a destination address of the reception data to determine whether the reception data is loop backed data; And if the received data is loop backed data, comparing the transmitted data with the looped back data to search for an error.

Advantageously, the time slot area allocation process comprises the steps of: allocating a master time slot area for a master to transmit to each slave device in common; And assigning slave device time slot regions to each slave device to transmit to the master, respectively. The master time slot region is a channel through which a master transmits data and each slave device receives corresponding transmission data, and the slave device time slot regions transmit data with each slave device and the master receives corresponding transmission data. Characterized in that the channels.

Also preferably, in the data receiving process, after the master transmits data through a transmission channel in a master time slot region, data is received through its own receiving channel along the set loop back path in each slave device time slot region. Steps; And after each slave device transmits data through a transmission channel in each slave device time slot region, respectively, receiving data through its own reception channel along the set loop back path in a master time slot region. It features.

Alternatively, the DM bus management method in the switch according to the embodiment of the present invention for achieving the above object isolates itself on the bus when the loop back error occurs and at the same time notifies the occurrence of the loop back error. And recovering the loopback error.

In the conventional DM bus, the data transmission / reception channel between the slave device and the master on the time slot is defined for each area, and the data transmitted by the slave device to the corresponding area can be received by the master, but the other slave device that has transmitted cannot receive the data. As a result, it was difficult to know in real time whether data was properly transmitted and received on the bus, that is, the DM bus could not provide self-diagnosis. However, in the present invention, the data transmission / reception channel with the master is in common, and each slave device is assigned a separate loop back time slot, so that in addition to the transmission / reception function with the master, the data transmitted by the user is looped back in real time to receive the data. Diagnose the transmit and receive functions on the DM bus in real time, which allows you to monitor your data on the DM bus and immediately detect when a loop-back failure occurs and isolate yourself on the DM bus. Follow-up measures can be taken to increase the reliability on the DM bus. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the switch according to the embodiment of the present invention, since the configuration of the DM bus is the same as the conventional technology, the description thereof is omitted, but the present invention provides a master board capable of generating a synchronization signal (FRS) and a clock signal (CLK) and a plurality of master boards. It has an IPC (Inter Processor Communication) structure of the DM bus that transmits and receives data based on time slots between slave boards. The IPC structure of the DM bus has a high-level data link control (HDLC) structure, which is a basic structure of messages. As the protocol is used, as shown in FIG. 5, a start flag, a PHY address (Phy_addr), a destination address (Dest_addr), an SRC address (src_addr), information (Information), and a cyclic redundancy check (CCR) are illustrated. ) And an end flag.

In addition, the transmission and reception channels between the master board and each slave board are separated, that is, a channel that the master board transmits to each slave board (receive channel of each slave board) and a channel that each slave board transmits to the master board (master Receiving channel of the board).

In this case, since only one entity transmitting and receiving in a transmission / reception channel exists at a given time, loop back is possible, which means that self-diagnosis is possible. In this case, when the master board transmits to all slave boards through the transmission channel, all slave boards receive, but only the device having the destination address in the IPC structure receives and processes the message.

In the DM bus of the present invention, a unique transmission area is allocated to master boards and slave boards through time slot assignment, and the master board loops back and receives data transmitted in real time, and the corresponding loop. With the received data backed-up, it is possible to diagnose the normal transmission / reception function on the DM bus. Also, a plurality of slave boards loop back the data transmitted in real time on the DM bus and receive the loop back on the DM bus in real time. It is made to diagnose whether the transmission / reception function is normal with data.

In addition, the present invention implements a time slot allocation scheme for transmitting and receiving data between a master board and a plurality of slave boards differently from the prior art, that is, in the related art, a plurality of time slots are provided in one synchronization signal FRS. In the present invention, the data transmission / reception channel between the master and the slave devices is separated and used.

A DM bus management method in an exchange according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 4 as follows.

In the related art, a time slot is shared between a master and each slave device, so that in case of looping back, even when trying to receive data transmitted by the master, it overlaps with data transmitted by another medium (ie, master or slave devices). The loop back could not be performed because the data would be damaged.

However, in the present invention, the transmit / receive time slot is made to be separated between the master and the slave devices, which means that the medium that can transmit in a specific time slot is either a master or a slave device. One medium means that the particular time slot can be looped back and monitored.

In other words, by separating the data transmission and reception time slot between the master and each slave device, not only data transmission and reception between the master and each slave device, but also their own transmission data can be looped back and received so that real-time self-diagnosis can be performed. do.

First, a data transmission / reception channel between the master and each slave device is separated to allocate a unique time slot area to the master and each slave device (step S1).

Looking at the first process (S1) in more detail as follows.

In the present invention, the allocation of each area is fundamentally different from that of the conventional method, that is, in the related art, data transmission and reception between the master and each slave device is possible only in the area allocated to each time slot. Likewise, by being assigned a specific time slot area, i.e., a master time slot area (e.g., A area), to be transmitted to each slave device in common, the master transmits data to each slave device through the corresponding A area. From the standpoint of each slave device, the corresponding A area becomes its own receiving channel.

In addition, as shown in FIG. 6, each slave device is allocated a time slot area (eg, a B area, a C area, a D area, and an E area) to be transmitted to the master, respectively, so that each slave device is assigned to the corresponding B area. It transmits its data to the master through the C area, D area, and E area. From the standpoint of the master, the corresponding B area, C area, D area, and E area becomes its reception channel.

When comparing the time slot allocation according to an embodiment of the present invention with the conventional time slot operation scheme, as shown in FIG. 7, there is always only one medium to be transmitted in a specific area, that is, in the A area, the master is a transmission medium and B In the region, the first slave device is the transmission medium, and in the C region, the second slave device is the transmission medium, and there is always one.

As described above, by allocating a time slot area such that there is always only one medium that can be transmitted in a specific time slot area, the conventional problem, that is, because there are always two mediums that can be transmitted in a specific time slot area, is used for data overlap. It is possible to solve the problem that the loopback function could not be used due to the damage caused, and thus freely loop back and monitor its own data. In order to perform self-diagnosis on the DM bus in real time, the master and each slave devices have their own. The loop back path is set up so that the user can simultaneously receive data transmitted by the user through the transmission channel of the receiver (step S2).

Then, as shown in FIG. 6, in the master time slot region (eg, the region A), the master transmits data to each slave device through its transmission channel, so that each slave device outputs data from the master. Is received through its own receiving channel.

In addition, each slave device transmits data to the master through its respective transmission channel in its own time slot region (e.g., B region, C region, D region, and E region), so that the master sends each slave device time. Receive data output from each slave device in a slot area (eg, B area, C area, D area, and E area).

As described above, at the same time as performing a data transmission / reception function between the master and each slave device, the master transmits data through its own transmission channel in the master time slot region (for example, A region) according to a self-diagnosis command ( Step S3), it receives its own transmission data through its transmission channel along the set loop back path (step S4).

At this time, the master checks whether the received data is the same as the destination address of the data transmitted by itself by reading the destination address of the received data in order to confirm whether the received data is loop backed data (step S5).

If the destination address is the same in the fifth step (S5), that is, in the case of loop backed data, the transmission data and the looped back data are compared to search for an error in the data (step S6). Insulate yourself on the DM bus and perform follow-up actions such as initialization.

Meanwhile, each slave device also transmits data through its own transmission channel in its own time slot region (e.g., B region, C region, D region, and E region), and then, in the master time slot region (e.g., A region) receives its own transmission data through its own reception channel along the set loop back path.

At this time, each slave device also reads the destination address of the received data and checks whether the received data is the same as the destination address of the data transmitted by itself in order to check whether the received data is loop backed data.

Therefore, if the destination address is the same, that is, if the data is looped back, the transmission data is compared with the looped data to find out whether an error occurs in the data, and if a loop back error occurs, it isolates itself on the DM bus. At the same time, follow-up measures such as initialization and the like should be performed.

As described above, according to the present invention, the data transmission / reception channel with the master is common and a separate loop back time slot is allocated to each slave device, so that the data transmitted by the user in addition to the transmission / reception function with the master is looped back in real time. By receiving this, the transmission and reception functions on the DM bus can be diagnosed in real time and immediately detected in the event of a loopback error, and the self can be isolated and followed on the DM bus to increase the reliability on the DM bus.

Claims (5)

A master is allocated a time slot area for transmitting data to each slave device, and each slave device is assigned a time slot area for transmitting data to the master; Setting up a loop back path that the master and each slave device can receive again after transmitting data in the time slot region allocated thereto; Receiving the transmission data through the loop back path after the master and each slave device transmits data in a time slot region allocated to the self diagnostic command; Comparing the transmission data with a destination address of the reception data to determine whether the reception data is loop backed data; And if the received data is loop backed data, comparing the transmitted data and the looped back data to search for an error. delete The method of claim 1, The time slot area allocated to the master is a channel through which the master transmits data and each slave device receives the transmission data, and the time slot areas allocated by the slave devices transmit data and the master each transmits data. Is a channel for receiving the transmission data. The method of claim 1, wherein the data receiving process comprises: Receiving the transmission data through the loop back path in the time slot region after the master transmits data in the time slot region allocated to the master according to a self-diagnosis command; And receiving the transmission data through the loop back path in the time slot region after each slave device transmits data in the time slot region assigned to the slave device according to a self-diagnosis command. DM bus management method. The method of claim 1, When the loopback error occurs as a result of the search, the process further comprises the step of isolating itself on the bus and notifying the occurrence of the loopback error to recover the corresponding loopback error. Way.