KR100979804B1 - System for transmission of the real-time data over internet protocol network - Google Patents

Abstract

PURPOSE: A real time data transmitting system with minimized time loss in a network configured in a ring topology type is provided to transmit voice/audio signals or real time data to a destination in real time without disconnection of the signals and data, thereby immediately coping with a severe disaster. CONSTITUTION: A network host transceives a monitoring frame or a diagnosis frame with at least two network clients in at least one direction. The network host logically blocks ring port 1(111) and ring port 2(112) by a VLAN(Virtual Local Area Network) method. Each of the network clients blocks a network according to a command of the network host or removes the blocking.

Description

Real-time data transmission system with minimized time loss in a network composed of ring topologies {SYSTEM FOR TRANSMISSION OF THE REAL-TIME DATA OVER INTERNET PROTOCOL NETWORK}

The present invention relates to a real-time data transmission system with minimized time loss, such as AOPI network, and more particularly, AoIP (Audio) for carrying real-time data to be minimized such as voice or audio data to IP (Internet Protocol). over Internet Protocol networks, real-time data transmission with minimal loss of time, such as AoIP networks that switch over and restore the network to ensure that the network is disconnected to reach the destination within voice or audio latency It is about the system.

In general, AoIP (Audio over Internet Protocol) converts a voice or audio signal to analog to digital (A / D) to send quantized sound source data to an IP (Internet Protocol) like a normal data packet and sends it to a destination IP address. It is a transmission method that restores original sound source by separating D / A (Digital to Analog) by separating sound source data from, and can transmit a long distance to a desired place in real time without mutual interference or analog attenuation in the network. It is a technology that can control additional audio equipment by inserting the control command of IP into the IP data area.

While there are advantages of using AoIP Ethernet network based on AoIP, there are technical limitations to bear because of using AoIP Ethernet network.

In other words, when an Ethernet network is disconnected and disconnected due to an accident, or when an error occurs in a network client and the packet can no longer be delivered, voice or audio IP data can no longer be delivered over the Ethernet network. The situation arises.

As the first conventional art of the simplest form for solving such a problem, a ring topology as shown in FIG. 1 can be considered.

That is, in the first prior art, as shown in FIG. 1, the switches 10, 30, and 50 have a ring topology, and a connection between the first switch 10 and the third switch 50 may be reduced. Even when disconnected, unlike the switch system of FIG. 1, a data packet may be transmitted from the second switch 30 to the third switch 50.

However, when the switches 10, 30 and 50 are normally connected, the switch system may form an infinite loop. For example, even after the data packet transmitted from the first switch 10 is transmitted to the second and third switches 30 and 50, the data packet is not destroyed and is returned to the second and third switches through the first switch 10 again. 30 and 50), repeating this process indefinitely. As a result, the switch system is subject to severe loads, so that the switch system does not perform the operation as a switch.

In order to solve this problem, in order to solve the infinite loop at the L3 level in the OSI layer 7 reference model, a system such as Korean Patent No. 487991 has been developed.

Hereinafter, the second prior art will be described with reference to FIGS. 2 to 7.

That is, referring to FIG. 2, the second prior art switch system includes a master switch 100, a first slave switch 120, a second slave switch 140, and a third slave switch 160. It has the form of a ring topology.

Each of the switches 100, 120, 140, and 160 may be a hub or a router and is connected to a computer, a notebook, and the like through a plurality of ports. In addition, each of the switches 100, 120, 140, and 160 is connected to other switches through two ports, respectively.

As illustrated in FIG. 2, the master switch 100 may include one port (eg, a first port) of the ports connected to the slave switches 120 and 160 when the switch system maintains the ring topology. ) And block the other port (e.g., the 0th port). As a result, the switch system of the second prior art does not have an infinite loop unlike the prior art, and operates substantially as a bus topology. Here, the ports connected between the switches may be arbitrarily selected among a plurality of switches according to a user's setting.

Slave switches 120, 140, and 160 send or receive data packets with predetermined data. However, since the first port of the master switch 100 is in a blocking state, the first slave switch 120 may not transmit a data packet to the master switch 100.

However, if the connection between the slave switches 140 and 160 is lost, the switch system disconnects the connection between the slave switches 140 and 160 even if the ports of the master switch 100 are not blocked. Not formed. Therefore, when the master switch 100 receives from the slave switches 140 and 160 that the connection between the slave switches 140 and 160 has been disconnected, the master switch 100 releases the blocking of the blocked port (the zeroth port). As a result, the switch system is transformed into a bus topology system, so that it can transmit and receive data packets.

This will be described in more detail with reference to FIGS. 2 through 7. First, the switches 100, 120, 140, and 160 block ports connected to other switches. This is to prevent the infinite loop from forming in the switch system.

Subsequently, the slave switches 120, 140 and 160 detect the connection state of the ports connected with the different switches, and then the first state information packet (see FIG. 3) having information on the connection state of the detected ports. )

Subsequently, the slave switches 120, 140, and 160 transmit the generated first state information packet (see FIG. 3) to the master switch 100.

In this case, the first state information packet (see FIG. 3) is a type of BPDU packet that can pass through a blocked port. Therefore, the first state information packets may be transmitted to the master switch 100 even when the ports of the master switch 100 are blocked.

The configuration of the first state information packet is illustrated in FIG. 3, and the first state information packet includes a transmission source and state information for each port.

For example, the first status information packet generated by the first slave switch 120 includes information indicating that the 0 port is connected to the first port of the second slave switch 140 and the first port is the master switch 100. Contains information that it is connected to the 0th port.

Thereafter, the master switch 100 analyzes the transmitted first status information packets to generate a first station list command (see FIG. 4) having a station list. Here, the first station list command is a kind of BPDU packet.

4, the first station list command includes station list information having state information of the switches 100, 120, 140, and 160.

Referring back to FIG. 2, the master switch 100 transmits the generated first station list command to the slave switches 120, 140, and 160 to detect the topology of the system.

In general, when the topology of the switch system is a ring topology, the first station list command transmitted through a specific port (eg, a 0th port) of the master switch 100 may be slave switches 120 and 140. And 160, and then received at another port (eg, a first port) of the master switch 100.

On the other hand, when the topology of the switch system is a bus topology, the first station list command transmitted through a specific port (eg, the 0th port) of the first pseudo master switch 100 may be a slave switch ( After passing through portions of 120, 140, and 160, they are received at the same port (0th port) as the transmission port among the ports of the master switch 100.

In the above, since the connection between the switches 100, 120, 140, and 160 is not broken as shown in FIG. 2, the master switch 100 indicates that the second prior art switch system is a ring topology type switch system. To judge.

Subsequently, when the switch system is a ring topology type switch system, the master switch 100 releases blocking of the first port among the blocked ports. Of course, the master switch 100 may release blocking of the 0th port and maintain blocking of the 1st port. In addition, the slave switches 120, 140, and 160 respectively release their blocked ports according to the unblocking command of the master switch 100.

Subsequently, the master switch 100 issues a first address table flash command (first ATF command) to initialize the MAC address table of the slave switches 120, 140, and 160. Create Here, the first ATF command is a kind of BPDU packet.

The master switch 100 then sends a first ATF command to the slave switches 120, 140, and 160. As a result, the MAC address table included in each of the switches 100, 120, 140, and 160 is initialized. That is, the switches 100, 120, 140, and 160 may transmit and receive data packets.

Meanwhile, in the system as shown in FIG. 2, when the connection between the slave switches 140 and 160 is lost, when the connection between the slave switches 140 and 160 is lost during transmission or reception of a data packet, Each of the slave switches 120, 140, and 160 checks the connection state of the ports, and transmits a second state information packet having a result of confirmation to the master switch 100. In this case, the master switch 100 continues to block the 0th port to prevent the occurrence of an infinite loop.

Thereafter, the master switch 100 analyzes the transmitted second state information packets to generate a second station list command having a new station list.

Subsequently, the master switch 100 transmits the generated second station list command to the slave switches 120, 140, and 160. Thus, the master switch 100 knows that the switch system is not in the form of a ring topology.

That is, when the switch system is not a ring topology switch system, the master switch 100 releases blocking of the blocked zeroth port. As a result, the bus topology is formed in the order of the second slave switch 140, the first slave switch 120, the master switch 100, and the third slave switch 160.

Subsequently, the master switch 100 generates a second address table flush command and transmits the generated second address table flush command to the slave switches 120, 140, and 160 to initialize the MAC address tables of the slave switches 120, 140, and 160. That is, the switches 100, 120, 140, and 160 may transmit and receive data packets.

5 is a flowchart illustrating an operation of the master switch of FIG. 2.

Referring to FIG. 5, the master switch 100 blocks the 0th port and the first port when booting up (S100). Here, the 0th port and the first port are ports connected to the slave switches 120 and 160. Of course, other ports besides the 0 and 1 ports may be connected to the slave switches 120 and 160.

Subsequently, the master switch 100 receives the first state information packets transmitted from the slave switches 120, 140, and 160 (S120).

Subsequently, the master switch 100 analyzes the received first status information packets to generate a first station list command having a station list. The generated first station list command is transmitted to the slave switches 120, 140, and 160 (S140).

Next, the master switch 100 detects the topology of the switch system by analyzing the first station list command transmitted to the master switch 100 after passing through the slave switches 120, 140, and 160 (S160).

Subsequently, it is determined whether the topology of the system is a ring topology according to the detection (S180).

Subsequently, when the topology of the switch system is a ring topology, blocking of the first port of the master switch 100 is released (S200). On the other hand, if the topology of the switch system is not a ring topology, blocking of the 0 and 1 ports of the master switch 100 is released (S220).

Subsequently, the master switch 100 transmits the first ATF command to the slave switches 120, 140, and 160 (S240). As a result, the blocking of the blocked ports of the slave switches 120, 140, and 160 is released, and then the MAC address tables are initialized (S260).

FIG. 6 is a flowchart illustrating an operation of each slave switch of FIG. 2.

Referring to FIG. 6, each of the slave switches 120, 140, and 160 blocks a 0 port and a first port (S300).

Subsequently, each of the slave switches 120, 140, and 160 detects a connection state with other switches of the 0th port and the first port (S320).

Subsequently, each of the slave switches 120, 140, and 160 generates a first state information packet having information on the connection state of the 0 th and 1 th ports and transmits the first state information packet to the master switch 100 (S340).

Subsequently, it is determined whether each of the slave switches 120, 140, and 160 has received the first station list command transmitted from the master switch 100 (S360).

Subsequently, when a predetermined time elapses without each of the slave switches 120, 140, and 160 receiving the first station list command, each of the slave switches 120, 140, and 160 ends the operation. (S400).

On the other hand, when each of the slave switches 120, 140, and 160 receives the first station list command, each of the slave switches 120, 140, and 160 is transferred from the master switch 100 after a predetermined time. The first ATF command is received (S380).

Subsequently, each of the slave switches 120, 140, and 160 releases blocking of the zeroth and first ports according to the received first ATF command (S420).

Subsequently, each of the slave switches 120, 140, and 160 initializes the MAC address table according to the received first ATF command (S440).

On the other hand, Figure 7 is a flow chart illustrating the operation of the switch system when the connection between the slave switch of the second prior art is broken.

Referring to FIG. 7, a failure occurs between the slave switches 120, 140, and 160 (S500). For example, the connection between the first slave switch 120 and the second slave switch 140 is lost.

Subsequently, each of the slave switches 120, 140, and 160 detects a connection state of ports, generates a second state information packet having information about the connection state of the detected ports, and generates the generated second state information. The packet is transmitted to the master switch 100 (S520).

Subsequently, the master switch 100 analyzes the transmitted second status information packet to generate a second station list command, and transmits the generated second station list command to slave switches 120, 140, and 160. (S540).

Subsequently, the master switch 100 determines the topology of the switch system through the second station list command transmitted from the third slave switch 160 after passing through the slave switches 120, 140, and 160 (S560). .

In this case, since the connection between the first slave switch 120 and the second slave switch 140 is lost, the master switch 100 determines that the switch system is a bus topology type switch system. Accordingly, the master switch 100 releases blocking of the 0 and 1 ports that have been blocked (S600).

As described above, the switch system including the master switch according to the second prior art and a method for controlling the same control the slave switches using the master switch, so that the data has a ring topology and does not have an infinite loop. There is an advantage in that the packet can be sent and received.

In addition, the switch system including the master switch according to the second prior art and a method for controlling the same, since the blocking of the ports of the master switch is released when the connection between the slave switches is disconnected, the slave switches through the master switch There is an advantage in that data packets can be transmitted and received in between.

However, in the above-described second prior art, IEEE 802.1D (STP; Spanning Tree Protocol), which is one of the Ethernet standards, is used in case of disconnection and disconnection of a network or an abnormality in a network. The recovery time is 30 seconds or more, and to further compensate for this, IEEE 802.1W (Rapid Spanning Tree Protocol) is proposed, but this also requires a maximum network recovery time of 5 seconds or more.

This is because, firstly, the second conventional technology performs switching at the OSI third layer (L3: network layer). Therefore, a packet having a logical address is controlled through a router, which in itself takes a lot of time.

Secondly, the BPDU (Bridge Protocol Data Unit) used in the second conventional technology is used to implement a ring topology, and uses the BPDU proposed by the IEEE in Spanning Tree Protocol (STP) in 1998. (Blocking → Listening → Learning → Forwarding → Disable) There is no difference from the ring protocol that has a multi-protocol protocol procedure. It is not much different from the STP (Spanning Tree Protocol) implementation procedure, which can be easily found in a management switch.

Third, the second conventional technology grasps the state of each port and creates state information as in 802.1D (see FIGS. 3 and 4), and exchanges information between the master switch and the slave switch, and the master switch transmits the state information. Since the time required for decryption is required, and the slave switch has a convergence time and a waiting time of the packet sent to the master switch, a long switching time is inevitably required. Therefore, the second conventional technology is IEEE802.1D. Similarly, this protocol is not suitable for AoIP ring networks that require a transfer time of up to 400msec.

For reference, in the convergence of the network in the 802.1D or the second conventional technology, since the configuration of the network is not known at the beginning, the master switch must have sufficient convergence time and receive status information from several slave switches. It is an implementation method to grasp the whole topology.

In other words, each slave switch needs to create and send its own status information so that the master switch can understand the overall topology. Therefore, it takes time to create and transmit status information. In addition, the master switch receives status information packets from each slave switch and receives the first station list command. When sending the first slave switch opens this, and then puts the information of the terminals connected to their switch to the next slave switch to continue to rotate in turn, it takes a lot of time to structure.

Therefore, the network recovery algorithm proposed by the IEEE cannot be used in an AoIP Ethernet system that delivers voice or audio, and cannot transmit data in real time.

For reference, the ITU-T recommendation suggests that a one-way voice support time of 25 ~ 300msec is acceptable and 400msec is the maximum limit.

After all, if the conventional IEEE standard protocol as described above is used, there is no big problem in general email, web search, FTP file transfer, etc. There is a problem that a disconnection phenomenon occurs in the audio signal.

In particular, when the AoIP network is used in a public address system connected to a fire control system, the above disconnection phenomenon may cause a big disaster such as a human accident because it does not transmit a fire alarm in real time.

Lastly, since the second prior art has to use a special packet called a BPDU, there is another problem that an Ethernet ring topology cannot be easily implemented with an ordinary Ethernet switch module chipset that does not support BPDU.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a network with almost no time loss, such as an Audio over Internet Protocol (AoIP) network that carries real-time data such as voice or audio data to an Internet Protocol (IP). In case of problems such as network short-circuit and link down or abnormality of network equipment, such as API network that switches and restores the network to reach the destination within the time when the listener does not feel the disconnection of voice or audio data. It is to provide a real-time data transmission system with minimal time loss.

In order to achieve the above object, a real time data transmission system with minimized time loss such as the AOP network of the present invention is a real time data transmission system with minimal time loss, such as an AOP network configured in a ring topology, and includes at least two network clients. A network host 100 transmitting the surveillance frame or the diagnostic frame in one or more directions to the 200, 300, and 400 or receiving the surveillance frame or the diagnostic frame transmitted from the network clients 200, 300, and 400; At least two network clients (200, 300 and 400) in response to signals transmitted from the network host (100); And the network host 100 includes an Ethernet switch module 110 including a host side CPU 130 and a MAC address table 117, a ring port 1 111, and a ring port 2 112. It is possible to block or unblock the network by logically blocking the ring port 1 (111) and the ring port 2 (112) by the port VLAN method, and have no MAC address without referring to the MAC address table 117. Each of the at least two network clients (200, 300, and 400), the client side CPU (230) and the MAC address table (117) and the respective ring port 1 (111). Ethernet switch module 210 including 211, 311, and 411 and ring ports 2 (112, 212, 312, and 412), respectively, according to instructions from the network host 100. 111) and ring port 2 (112) by the port VLAN method. Ever blocked by characterized in that the blocking or unblocking the available networks.

Advantageously, said network host 100 and said at least two network clients 200, 300, and 400 each further comprise port VLAN control registers 118, 218, such that the port VLAN control registers 118, 218. ) Generates and transmits a diagnostic frame 603 ˜ 607 that communicates between the network host 100 and the at least two network clients 200, 300, and 400 with reference to the MAC address tables 117 and 217. ,

The ring port 1 111 of the network host 100 is connected to the ring port 2 212 of the first network client 200 of the at least two network clients 200, 300, and 400, and the network host Ring port 2 112 of (100) is characterized in that connected to the ring port 1 (411) of the last network client 400.

Also preferably, the network host 100 further includes an AoIP frame generation module 140 that receives and digitizes an analog voice or audio signal and performs the function of loading the digitized information into an IP data area. Each of the at least two network clients 200, 300, and 400 further includes an analog sound source reproducing module 240 for reproducing an original analog voice or audio signal from the digitized information. It is characterized by a redundant system.

The surveillance frames 601 and 602 are composed of a clockwise surveillance frame 601 and a counterclockwise surveillance frame 602 as a set, and the transmission frequency of the surveillance frame is preferably one hundred orders per second.

According to the real-time data transmission system minimized time loss, such as the AOPIP network according to the present invention, when a problem such as a network short circuit, link down or abnormality of the network equipment, the listener does not feel the disconnection of voice or audio data within the time By quickly changing and restoring the system, voice or audio signals or real-time data, such as fire or earthquake occurrences, can be reached in real time without interruption in public address, so that immediate disasters can be dealt with immediately.

Other objects and advantages of the present invention in addition to the above object will be apparent from the detailed description of the embodiments with reference to the accompanying drawings.

1 is a schematic view of a first prior art switch system.
2 shows a switch system according to a second prior art.
3 shows a configuration of a first state information packet in a switch system according to the second prior art.
Figure 4 shows the configuration of the first station list command in the switch system according to the second prior art.
5 is a flowchart illustrating an operation of the master switch of FIG. 2.
FIG. 6 is a flowchart illustrating an operation of each slave switch of FIG. 2.
FIG. 7 is a flowchart illustrating an operation of a switch system when a connection between slave switches of FIG. 2 is lost.
8 is a schematic diagram showing the entire real-time data transmission system according to an embodiment of the present invention.
9 is a diagram illustrating a configuration of a host switch module of a real-time data transmission system according to an embodiment of the present invention.
10 is a diagram illustrating a configuration of a client switch module of a real-time data transmission system according to an embodiment of the present invention.
11 is a flowchart illustrating a method of monitoring an abnormality of a ring topology in a control method of a real-time data transmission system according to an embodiment of the present invention, and a switching method when an abnormality occurs.
12 to 17 are detailed subroutines of FIG. 11, FIG. 12 is a subroutine for the VLAN separation step of the host, FIG. 13 is a subroutine for the surveillance frame generation step, and FIG. 14 is a surveillance frame transmission step. FIG. 15 is a subroutine for the non-communicating client identification step, FIG. 16 is a subroutine for the client VLAN separation step, and FIG. 17 is a subroutine for the host VLAN separation release step.
18 is a flowchart illustrating a method of restoring a ring topology, which has been switched among the control methods of a real-time data transmission system, according to an embodiment of the present invention. FIG.
19 to 21 are detailed subroutines of FIG. 18, FIG. 19 is a subroutine for attempting communication with a client attempting ring detachment, and FIG. 20 is a subroutine for separating a host into a port VLAN, 21 is a subroutine for the ring release phase of the client.
22 is a diagram illustrating a format of a surveillance frame of a real-time data transmission system according to an embodiment of the present invention.
FIG. 23 shows a configuration of various control data frames including the surveillance frame of FIG.
24 is a view for explaining an example of the port VLAN of the host switch module of the real-time data transmission system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a real-time data transmission system minimized time loss, such as AOP network according to the present invention.

First, a real-time data transmission system minimized in time loss such as an AOP network according to an aspect of the present invention will be described below.

FIG. 8 is a schematic diagram of a real-time data transmission system according to an embodiment of the present invention. FIG. 9 is a diagram illustrating a configuration of a host switch module of a real-time data transmission system according to an embodiment of the present invention. Is a diagram showing the configuration of a client switch module of a real-time data transmission system according to an embodiment of the present invention.

22 is a diagram illustrating a format of a surveillance frame of a real-time data transmission system according to an embodiment of the present invention. FIG. 23 is a diagram illustrating a configuration of various control data frames including the surveillance frame of FIG. 22. FIG. 4 is a diagram illustrating an example of a port VLAN of a host switch module of a real-time data transmission system according to an embodiment of the present invention.

In the accompanying drawings, a real-time data transmission system of the present invention will be described using Audio over Internet Protocol (AoIP) as an example, but only in the network for the delivery of other data that is to be delivered in real time with almost no time delay. Of course, the present invention can be applied as it is.

As shown in FIG. 8, the real-time data transmission system configured in the form of a ring topology according to the present invention includes one AoIP network host 100 and one or more AoIP network clients, that is, first to third AoIP network clients 200, 300 and 400).

More specifically, the AoIP network host 100 may include a first direction (clockwise) of the first to third AoIP network clients 200, 300, and 400 and a second direction (counterclockwise) opposite to the first direction. ) Transmits a surveillance frame at the second level of the OSI model, or receives a signal transmitted from the first to third AoIP network clients 200, 300, and 400.

For reference, although the second conventional technology transmits a packet such as a bridge packet data unit (BPDU), which is strictly different from the surveillance frame of the present invention, the function is also different. Also, it is not at all different from the surveillance frame of the present invention.

Referring back to FIG. 8, the first to third AoIP network clients 200, 300, and 400 respond to the signals transmitted from the AoIP network host 100 to output voice and audio signals.

In this case, the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 are each assigned an independent MAC address, and the AoIP network host 100 is provided with the first to third AoIP. Send commands to the network clients 200, 300, and 400, or have the first to third AoIP network clients 200, 300, and 400 use the MAC address assigned when reporting to the AoIP network host 100; do.

In addition, the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 may each ring port 1 (111, 211, 311, and 411) capable of blocking their respective networks. ) And ring ports 2 (112, 212, 312, and 412), wherein the first to third AoIP network clients (200, 300, and 400) are included according to the instructions of the AoIP network host (100), respectively. Block ring port 1 and ring port 2.

Here, the network configuration in the first direction (clockwise) of the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 will be described. Ring port 1 of the AoIP network host 100 is described. 111 is connected to ring port 2 212 of first AoIP network client 200, and ring port 1 211 of first AoIP network client 200 is a ring port of second AoIP network client 300. 2 (312), ring port 1 (311) of the second AoIP network client 300 is connected to ring port 2 (412) of the third AoIP network client 400, and the third AoIP network client (400) Ring port 1 412 is connected to ring port 2 112 of the AoIP network host 100.

In addition, referring to the network configuration in the second direction (counterclockwise), ring port 2 112 of the AoIP network host 100 is connected to ring port 1 411 of the third AoIP network client 400, Ring port 2 412 of the third AoIP network client 400 is connected to ring port 1 311 of the second AoIP network client 300 and ring port 2 312 of the second AoIP network client 300. Is connected to ring port 1 211 of the first AoIP network client 200, and ring port 2 212 of the first AoIP network client 200 is connected to ring port 1 111 of the AoIP network host 100. Connected.

In the present specification, for convenience of description, the flow of a frame flowing from each ring port 1 to ring port 2 of each of the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 is directed to a first direction. While it is defined as clockwise, while the flow of the frame flowing from each ring port 2 to the ring port 1 is defined as the counterclockwise direction, which is the second direction, but is not limited thereto.

In the flow of the frame, the ring port in which the frame is transmitted is regarded as a Tx (Transmit) frame, and the ring port receiving the frame is regarded as an Rx (Receive) frame. That is, regardless of the clockwise and counterclockwise directions, the Tx frame or the Rx frame may vary depending on the point at which the frame is transmitted and received.

In this case, the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 include respective general Ethernet ports 121, 122, 123, 124, and 125 for transmitting and receiving respective data. In addition, the AoIP network can be further extended, and the hybrid topology can operate not only a ring topology but also a tree topology and a star topology.

Meanwhile, as shown in FIG. 9, the AoIP network host 100 includes an AoIP frame generation module 140, an Ethernet switch module 110, and a CPU 130, and again, the Ethernet switch module 110 includes a frame. The first and second ring ports 111, which comprise a buffer 116, a MAC address table 117, a port VLAN control register 118, and a CPU serial interface 119, in addition to communicating with adjacent clients 200, 400. 112, an AoIP port 115 communicating with the AoIP frame generation module 140, first and second CPU ports 113 and 114 communicating with the CPU 130, and general AoIP ports 121 to 125. Include them.

Also, as shown in FIG. 10, the AoIP network client 200 includes an analog sound source playback module 240, an Ethernet switch module 210, and a CPU 230, and again, the Ethernet switch module 210 is First and second rings, consisting of frame buffer 216, MAC address table 217, port VLAN control register 218, and CPU serial interface 219, in addition to communicating with adjacent hosts and clients 100, 300 Ports 211 and 212, an AoIP port 215 in communication with the analog sound source reproducing module 240, a CPU port 213 in communication with the CPU 230, and general AoIP ports 221 through 225.

The same applies to the second and third AoIP network clients 300 and 400.

Meanwhile, in the present specification, the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400 each include almost the same configuration, and the CPU 130 is configured to be the AoIP network host 100 or the first. Since only the functions when used in the first to third AoIP network clients 200, 300, and 400 are different, the functions of the central processing unit (CPU) and other modules will be described with reference to FIG. 9, respectively. Will be described separately with reference to FIG. 10.

The AoIP frame generation module 140 receives and digitizes an analog voice or audio signal and digitizes the digitized information. The digitized voice or audio signal is primarily IPized. At the same time, the AoIP frame generation module 140 converts the Ethernet frame. That is, the Ethernet frame is generated by generating the Ethernet MAC (Ethernet MAC) information and the Ether Type information in the overhead of the IP in the AoIP frame generation module 140.

The host-side Ethernet switch module 110 is connected to the AoIP frame generation module 140, the client-side Ethernet switch module 210 is connected to the analog sound source playback module 240, the AoIP network host 100 and A ring port of each of the first to third AoIP network clients 200, 300, and 400 is formed, and ring port 1 (111, 211, 311, and 411) and ring port 2 (112, 212, 312, and 412) are formed. The switch port 1 and the ring port 2 may be switched or restored. That is, the ring ports and the general ports 120 and 220 form a Port Based Virtual LAN (VLAN).

For example, each port of the Ethernet switch module is interconnected because it is usually grouped as 'port VLAN 1', but when blocking ring port 1 and ring port 2, as shown in FIG. 24, a ring port 2 is grouped separately as 'port VLAN 2', and regular ports and ring port 1 as 'port VLAN 1'. Thus, ring port 1 and ring port 2 are blocked. On the other hand, when unblocking ring ports, all ports are grouped back into 'port VLAN 1'.

An example of the actual program is as follows.

void NC_RP2_Block ()

{

    MDIO_Write (0x10, 0x06, 0x03fa);

    MDIO_Write (0x11, 0x06, 0x03f9);

    MDIO_Write (0x12,0x06,0x8400);

    MDIO_Write (0x13, 0x06, 0x03f3);

    MDIO_Write (0x14,0x06,0x03eb);

    MDIO_Write (0x15, 0x06, 0x03db);

    MDIO_Write (0x16, 0x06, 0x03bb);

    MDIO_Write (0x17, 0x06, 0x037b);

    MDIO_Write (0x18, 0x06, 0x02fb);

    MDIO_Write (0x19, 0x06, 0x01fb);

    MDIO_Write (0x1a, 0x06, 0x8004);

    MDIO_Write (0x1B, 0x0C, 0x0026);

    MDIO_Write (0x1B, 0x0D, 0x0180);

    MDIO_Write (0x1B, 0x0E, 0xC200);

    MDIO_Write (0x1B, 0x0F, 0x0020);

    MDIO_Write (0x1B, 0x0B, 0xB000);

}

In this case, the Ethernet switch module 110 operates as an Ethernet switch module in a general network configuration. However, when the Ethernet switch module 110 is changed to a ring topology, the Ethernet switch module 110 forms a ring port 1 and a ring port 2 to switch to an AoIP ring Ethernet network.

The CPU 130 functions to control the AoIP frame generation module 140 and the Ethernet switch module 110, and controls the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400. Since the functions used for each are different, below, it divides and explains two.

That is, when the CPU 130 is used for the AoIP network host 100, the CPU 130 is connected to the ring port 1 and the ring port 2 between the AoIP network host 100 and the first to third AoIP network clients 200, 300, and 400. It controls the entire AoIP ring network, transmits a surveillance frame having only a physical address as shown in FIG. 22 to the entire AoIP ring network to confirm that there is no problem in the entire AoIP ring network, and when the network is troubled and solved, Transfer and recover.

Accordingly, in the second conventional technology or the existing ring configuration, the first pass only the BPDU (Bridge Protocol Data Unit) which is specially supported by the switch when blocking, and the AoIP packet is blocked. In the present invention, since the network is logically divided into two or more groups by using a port VLAN method, blocking is implemented, and thus, even a separate packet can be used as a monitoring packet without using a separate BPDU packet. Watch packets can be identified and a ring topology can be constructed at a lower cost.

In addition, before configuring a ring topology as shown in FIG. 24, any one port of the host must be blocked, and in the present invention, a port based VLAN provided by a general switch fabric is applied. However, as in the conventional art, only special purpose BPDUs can be used to overcome any limitation and any Ethernet packet or frame can be simply used as a surveillance frame. In other words, when using a port VLAN, it is physically in the form of a ring, but logically, a bus-like network is formed to prevent packet storms.

In addition, the AoIP network host side CPU 130 is configured to connect an Ethernet port to each of these separated networks, that is, 'port VLAN 1' and 'port VLAN 2', so as to simultaneously send and receive arbitrary monitoring packets. .

On the other hand, when the CPU 130 is used for each of the first to third AoIP network clients 200, 300, and 400, the ring port 1 and the ring port 2 are not blocked when the network between adjacent hosts / clients is normal. When a problem occurs in an AoIP ring network between neighboring hosts / clients, the method and the terminal logically block ring port 1 and receive and process a diagnostic frame transmitted from the AoIP network host 100.

FIG. 22 shows the format of an Ethernet frame 600 such as a supervisory frame and a diagnostic frame in the present invention, and FIG. 23 shows the same as the supervisory frames 601, 602 and diagnostic frames 603-607 used in the present invention. An example of the specific format of various control Ethernet frames is shown.

First, the surveillance frames 601 and 602 include a destination address DA (Destination Address), which is a six-byte physical address, a source address (SA) of six bytes, and a two-byte data type identifier (eg, '002E'). The remaining payload may be any information. The final error check code is followed by a Frame Check Sequence (FCS) (for example, a 'CRC check'). More specifically, in the clockwise watch frame, the MAC address of host CPU port 1 (113) is designated as SA, and the MAC address of host CPU port 2 (114) is designated as DA, and vice versa. The MAC address of host CPU port 2 114 is designated SA, and the MAC address of host CPU port 1 113 is designated DA.

In exemplary embodiments, when a network is determined by a ring topology in the AoIP network host 100, the CPU 130 may determine a first direction (clockwise) and a first direction of the first to third AoIP network clients 200, 300, and 400. The surveillance frame is transmitted in two directions (counterclockwise), wherein the surveillance frame transmitted from ring port 1 111 of the AoIP network host 100 is transmitted through the first to third AoIP network clients 200, 300, and 400. Received by the ring port 2 112 of the AoIP network host 100, the CPU 130 of the AoIP network host 100 checks the received surveillance frame, the abnormality in the ring topology in the first direction (clockwise) You can check whether there is any.

Conversely, watch frames transmitted from ring port 2 112 of AoIP network host 100 are ringed by AoIP network host 100 through first to third AoIP network clients 200, 300, and 400 along a ring topology. The received monitoring frame is received by the port 1 111, and the CPU 130 of the AoIP network host 100 checks the received surveillance frame to check whether there is no abnormality in the ring topology in the second direction (counterclockwise). .

In this way, the transmission of the surveillance frame in the first direction (clockwise) and the second direction (counterclockwise) to confirm the abnormality of the ring topology is to quickly identify the abnormality of the AoIP ring network and start the transfer operation. For sake.

Herein, in the present invention, preferably, 100 or more surveillance frames per second from the AoIP network host 100 to one or more AoIP network clients 200, 300, and 400 in a first direction (clockwise) and a second direction (counterclockwise). It is possible to check whether there is an abnormality of the AoIP ring network and transmit it to the network. In this way, 100 or more surveillance frames per second are transmitted in both directions, and thus the abnormality of the AoIP ring network can be confirmed within 10 msec.

More specifically, in FIG. 24, the host-side CPU 130 connects two different ring ports to 'port VLAN 1' and 'port VLAN 2', respectively.

As described above, the surveillance frames 601 and 602 of the present invention use a 'frame' format that does not have an OSI level 2 logical address, and thus are different from a conventional 'packet' structure having OSI level 3 logical addresses together. Fundamentally different, the host CPU generates a destination address (DA) and a source address (SA) to the ring so that it only has a MAC address, while the other switch CPU does not intervene while the watch frame passes. In other words, whatever data enters the payload can be used as a surveillance frame in the present invention. This is a significant difference from the second prior art. Overall, the payload processing time is not needed at the host and the terminal, so it is quickly determined whether the ring is disconnected. On the other hand, any Ethernet frame is useful as a supervisory frame in addition to special packets such as BPDUs, making the ring architecture less expensive.

In addition, in the second conventional technology, when a failure occurs in the cited invention, as shown in FIG. 7, a link state is identified in a failed terminal (that is, a ring is disconnected), and the link state is included in a second status packet and sent to the host. In order to determine the topology of the entire network, a second state list command is sent to the terminals and the terminals receive the second state list command to determine the system topology, that is, the ring connection state.

However, in the present invention, only the MAC address of the surveillance frame sent from the 'ring port 2' or the 'ring port 1' is sent from the 'ring port 1' to the 'ring port 2' to check whether the ring is disconnected. There is an advantage that can be quickly identified.

On the other hand, the host CPU 130, in order to identify a client that is not communicating when at least one surveillance frame of the clockwise and / or counterclockwise surveillance frames 601 and 602 does not arrive within a predetermined time. The client response request frame 603 is sent, and the client receiving the request sends a response to the client response frame 604. The SA of the client response request frame 603 is a ring of the host CPU. It is the MAC address of port 1 or ring port 2, the DA is the MAC address of the client requesting confirmation, and the payload includes the response request. In contrast, the SA of the 'client response frame' 604 is the MAC address of the specific client to be acknowledged, the DA is the MAC address of ring port 1 or ring port 2 of the host CPU, and the payload contains the response. .

Further, when a ring break occurs in a specific client, and the host requests that the specific client to detach the ring or reversely recovers the ring connection to the specific client, the client disconnection request frame 605 and The client ring connection request frame 606 is transmitted. In contrast, when the specific client completes the execution of the host command, the server transmits a host command completion echo frame 607. The SAs of the request frame '605 and the' client ring connection request frame '606 are the MAC addresses of the ring port 1 or the ring port 2 of the host CPU, and the DA is the MAC address of the specific client to execute the host command. The payload contains the contents of the RP1 separation request and the RP1 connection request. In contrast, the SA of the 'host command execution completed echo frame' 607 becomes the MAC address of the specific client that executed the host command, and the DA becomes the MAC address of ring port 1 or ring port 2 of the host CPU. Echo contents are included.

The diagnostic frames 603 to 607 described above also have an FCS (for example, CRC) at the end, and ET is '0800' as an example.

Hereinafter, in a real-time data transmission system with minimized time loss, such as the AOPIP network of the present invention, a ring recovery monitoring and switching method will be described with reference to FIGS. 11 to 17. It demonstrates with reference.

11 is a flowchart illustrating a method for monitoring an abnormality of a ring topology in a control method of a real-time data transmission system according to an embodiment of the present invention, and a switching method when an abnormality occurs. FIGS. 12 to 17 are detailed subroutines of FIG. 12 is a subroutine for the VLAN separation step of the host, FIG. 13 is a subroutine for the surveillance frame generation step, FIG. 14 is a subroutine for the surveillance frame transmission step, and FIG. Subroutine for the phase, FIG. 16 is a subroutine for the VLAN separation phase of the client, and FIG. 17 is a subroutine for the VLAN separation phase of the host.

18 is a flowchart illustrating a method of restoring a ring topology, which has been switched among the control methods of a real-time data transmission system, according to an embodiment of the present invention back to an original state, and FIGS. 19 to 21 are detailed subroutines of FIG. 18. 19 is a subroutine for attempting communication with a client attempting ring detachment, FIG. 20 is a subroutine for separating a host into a port VLAN, and FIG. 21 is a subroutine for a ring detaching phase of a client. to be.

Hereinafter, a method of monitoring whether there is a ring error and switching when an error occurs in a real-time data transmission system such as an AOP network minimized will be described with reference to FIGS. 11 to 17.

First, as shown in FIG. 11, the AoIP network host 100 logically separates the ring ports of the host switch module 110, but, for example, the ring port 1 111 is port VLAN 1 (see FIG. 24). Ring port 2 112 performs blocking (the actual operation differs from the blocking of the second prior art) that is divided into port VLAN 1 (152 (see Fig. 24)) (S110).

12, a value for setting all ports to 'port VLAN 1' 151 is written to the 'port VLAN control register' 118 (S111), and CPU port 2 (114 in FIG. 9). ) And the value for setting the ring port 2 (RP2) 112 to the 'port VLAN 2' 152 is written to the 'port VLAN control register' 118 (S112). Eventually, since ring port 2 is grouped separately as 'port VLAN 2', and general ports and ring port 1 are 'port VLAN 1', ring port 1 and ring port 2 are separated from each other.

Here, the reason for separating the ring port 2 (112) is that, in the network consisting of the AoIP network host 100 and the first to third AoIP network clients (200, 300 and 400) as the frame continues to rotate the ring network This is to prevent the occurrence of broadcast storms that bring down the entire network.

Next, the AoIP network host 100 refers to the 'MAC address table' 117 for each ring port of RP1 and RP2 as shown in Figs. 22 and 23, clockwise surveillance frame 601 and counterclockwise. The direction monitoring frame 602 is generated (S120).

Referring to FIG. 13, the clockwise monitoring frame 601 sets the Ethernet port MAC address connected to the CPU port 2 to DA (S121), and the counterclockwise monitoring frame 602 is connected to the CPU port 1 Ethernet. This is done by setting the port MAC address to DA (S122).

The AoIP network host 100 then forwards the bidirectional monitoring frames 601, 602 to the first to third AoIP network clients 200, 300, and 400 via ring port 1 111 and ring port 2 112. In the first direction (clockwise) and the second direction (counterclockwise), for example, the surveillance frame is transmitted at a frequency of 100 or more times per second (S130).

Referring to FIG. 14, the clockwise monitoring frame 601 is transmitted to the port VLAN 1 151, that is, the ring port 1 111 through the CPU port 1 113 (S131), and the counterclockwise monitoring is performed. The frame 602 is transmitted to the port VLAN 2 152, that is, the ring port 2 112, through the CPU port 2 114 (S132).

In this case, in the surveillance frame generated by the CPU 130 of the AoIP network host 100, the ring port 1 111 and the ring port 2 112 are logically separated from each other, so that the ring port is formed at the ring port 1 111. Since it does not pass to 2 (112) and from ring port 2 (112) to ring port 1 (111), broadcast storm generation can be prevented.

Then, the first to third AoIP networks in the first direction (clockwise) and the second direction (counterclockwise) through the ring port 1 (111) and the ring port 2 (112) of the AoIP network host 100. Ring port 2 (212, 312, 412) and ring port 1 (411, 311, 211) of clients 200, 300, and 400 are circulated to ring port 2 (112) and ring of host 100. Each of the surveillance frames entering the port 1 111 is confirmed by the host CPU 130, and the surveillance frames transmitted from the AoIP network host 100 in either of the first direction and the second direction are for a predetermined time. If it is not confirmed within (for example, 30 msec), it is determined that there is an error in the ring topology (S140).

Subsequently, in order to check which network client among the first to third AoIP network clients 200, 300, and 400 has an error (S150), the first through the ring port 1 111 of the AoIP network host 100 may be used. In the clockwise direction, the client response request frame 603 is transmitted through the host RP1 and the RP2, which is a type of Internet Control Management Frame (S151), and the client CPU 230 transmits the client response request frame ( Immediately after receiving 603, the client response frame 604 is issued to the host within 0.1 msec to respond (S152). The host CPU 130 checks the client that the client response frame 604 does not arrive within 30 msec (S153), and finally confirms the client that cannot communicate.

Subsequently, the RP1 of the client that can communicate directly with the client that is not able to communicate is separated into a port VLAN (S160). More specifically, this will be described in detail with reference to FIG. 16. For example, the second client: 300 transmits a 'ring separation request frame' 605 to the immediately preceding client (for example, the first client: 200) (S161), and the client CPU 230 transmits the 'ring separation request frame'. And then reset RP1 to port VLAN 2 through the 'port VLAN control register' (218) to separate RP1 and RP2 (S162), and then 'host command execution complete echo frame' (607) to inform the host that port blocking is complete. ) Is transmitted (S163).

That is, the AoIP network host 100 is identified as the network client that can be connected to the maximum ring port 1 (111) of the host 100 through the step S150, the AoIP network host 100 is ring port 1 (111) Through the 'client ring separation request frame' 605 is transmitted to block the ring port 1 (211, 311, 411) of the connectable network client of the first to third AoIP network clients (200, 300 and 400).

Finally, release the separation of the RP1 and RP2 of the host 100 bar (S170), because the RP1 and RP2 of the first client is separated, even if the release of the ring port of the host does not cause a storm problem, Rather, for smooth communication between clients, the host's ring port must be interconnected.

More specifically with reference to FIG. 17, the host CPU sets the VLAN control register 118 to integrate the setting of the port VLAN of the RP2 into the port VLAN1 (S171), and transmits to each client through the host RP1 or the RP2. The client response request frame 603 is transmitted (S172), and the 'client response frame' 604 is confirmed from the respective clients (S173).

Now, the host 100 terminates the network switchover (S180), and transmits a general AoIP packet. The time required to detect the abnormality and complete the transfer path is only 300 msec. At the moment of not recognizing, the ring can be changed. At the same time, the host 100 enters the ring recovery monitoring mode of FIG. 18 to monitor whether the ring is restored.

That is, the CPU 130 of the AoIP network host 100 releases the blocking of the ring port 2 112 blocked in the step S110 so that the general voice and audio packets are switched in the second direction (counterclockwise). Since the module 110 is controlled, even if a problem occurs in any one of the first to third AoIP network clients 200, 300, and 400, even if a problem occurs in the network client, the original sound can be performed without interruption of the voice or audio signal by quickly completing the switching operation. Can play.

It also informs the operator's terminals, such as PDAs and computers, of the switchover of the AoIP ring topology, so that troublesome network clients can be quickly recovered.

On the other hand, when the AoIP ring topology is switched to the switching mode as described above, the network client having a problem is recovered, which will be described with reference to FIGS. 18 to 21.

First, the CPU 130 of the AoIP network host 100 may include one of the first to third AoIP network clients 200, 300, and 400 having a ring port blocked through ring port 2 112. In this case, an attempt is made to communicate with the first client: 20) (S210). It is determined whether the RP1 response of the client performing the ring separation is received (S220). If yes, the process proceeds to the next step (S230).

Referring to FIG. 19, the host transmits a 'client response request frame' 603 to the client performing ring separation through the host RP2 (S211), and 'is the ring physically restored?' If it is determined whether or not (S212), the recovery has not been performed, and the client performing ring separation cannot receive the host frame through its RP1, there is no response, so the process proceeds to step S310 of FIG. 18 and continues. In this case, the client performing ring detachment receives a host frame through its RP1 (S213), and the client performing ring detachment sends a 'client response frame' 604 to the host through RP1 (S215). .

In this case, the general AoIP voice packet cannot pass through the blocked ring ports of the AoIP network clients 200, 300, and 400, but the monitoring or diagnostic frame of FIG. 23 transmitted through the AoIP network host 100 is blocked. Through the CPU 130 of the AoIP network client (200, 300 and 400).

Next, in step S220, the first to third AoIP network clients 200, 300, and 400 receive the 'client response request frame' 603 transmitted through the AoIP network host 100, and then receive the received message. If the host 100 confirms this by transmitting a response signal (S220), the CPU 130 of the AoIP network host 100 receiving the response signal determines that the network client having a problem has been recovered. In order to separate ring ports of the AoIP network host 100, the ring port 2 112 is blocked again (S230).

Referring to FIG. 20, the value for setting all ports to port VLAN 1 is written to the port VLAN control register 118 (S231), and the values for setting CPU port 2 and RP2 to port VLAN 2 are port VLANs. Write to the control register (S232) to separate ring port 1 (111) and ring port 2 (112).

Thereafter, the CPU 130 of the AoIP network host 100 transmits a blocking release signal to the AoIP network client (here 200) having the blocked ring port and recovers the switch to the original ring topology (S240).

Referring to FIG. 21, the host 100 transmits a 'ring connection request frame' 606 to a client performing ring separation through RP1 and RP2 (S241) and a client performing ring separation. After receiving the 'ring connection request frame', all ports are set to the VLAN 1 through the VLAN control register 218 (S242), and the client receives the 'host command execution completion echo frame' 607 indicating that the host has completed the request. In step S243, the host transmits a response frame 603 to each client through RP1 or RP2 (S244), and each client sends a response frame 604 to the host (S245). Checks the response frame from each client (S246).

As a result, network recovery is terminated (S250), and the AoIP network host 100 continuously transmits a supervisory frame through the ring port 1 111 and the ring port 2 112 to the first to third AoIP network clients 200, 300, and the like. The watch mode operation continues to monitor the ring topology by transmitting to the first direction (clockwise) and the second direction (counterclockwise).

According to the real-time data transmission system with minimized time loss such as the AOP network of the present invention, unlike the second conventional technology, the surveillance frame 601, which does not have a logical address but consists only of a MAC address and does not interfere with a network client, The 602 is quickly rotated through the ring port at hundreds of times per second, so that the ring is disconnected at tens of msec.

In addition, since it is not necessary to generate the status information of the interconnection of each network client and terminals connected to each client switch or report and classify the network host 100 in advance, network initialization and failure detection can be performed quickly.

Furthermore, the second prior art uses a specially formatted packet called BPDU for detecting the topology of the network, which is completely different from the supervisory frame of the present invention, and the second prior art has no concept of the supervisory frame of the present invention. However, the supervisory frame of the present invention can be used at any speed because the payloads in the watch frame are irrelevant to any content, provided that the DA and SA are MAC addresses. The ring topology can be constructed at a lower cost.

Since the separation between the ring ports in the Ethernet switch module (110, 210) of the present invention is logically made in a port VLAN method, it is also possible to quickly switch and recover.

The determination of whether a ring is disconnected can be performed quickly, since the host can determine whether the ring is connected by only the MAC address information of the surveillance frame sent from one ring port to the other ring port without analyzing status information.

According to the embodiments of the present invention, when an abnormality such as a ring connection occurs, switching can be performed within 300 msec as much as possible, thereby preventing a break in the voice during transmission of voice data such as an audio signal, and during an earthquake warning or other emergency propagation. This allows for the fastest possible data transfer regardless of the ring break.

Although the present invention has been described above according to an embodiment of the present invention, a person skilled in the art to which the present invention belongs has changed and modified within the scope without departing from the technical spirit of the present invention. Of course.

100: AoIP Network Host
110: Ethernet switch module 111: ring port 1
112: ring port 2 113: CPU port 1
114: CPU port 2 115: AoIP port
116: frame buffer 117: MAC address table
118: port VLAN control register 119: CPU serial interface
120: Ethernet port 121: Normal port 1
122: normal port 2 123: normal port 3
124: general port 4 125: general port 5
130: host side CPU 140: AoIP frame generation module
151: Port VLAN 1 152: Port VLAN 2
200: AoIP Network Client
210: Ethernet switch module 211: Ring port 1
212: ring port 2 213: CPU port
215: AoIP Port
216: frame buffer 217: MAC address table
218: Port VLAN Control Register 219: CPU Serial Interface
220: Ethernet port 221: general port 1
222: general port 2 223: general port 3
224: general port 4 225: general port 5
230: client side CPU 240: analog sound source playback module
300: AoIP Network Client 311: Ring Port 1
312 ring port 2 315 AoIP port
400: AoIP Network Client 411: Ring Port 1
412: Ring port 2 415: AoIP port
600: Ethernet frame for monitoring and diagnostics
601: clockwise surveillance frame 602: counterclockwise surveillance frame
603: Client response request frame 604: Client response frame
605: client ring detach request frame
606: client ring connection request frame
607: Echo frame of completion of host command

Claims (5)

It is a real-time data transmission system that minimizes time loss in a network composed of a ring topology.
The network host 100 transmitting the surveillance frame or the diagnostic frame to at least two network clients 200, 300, and 400 in one or more directions, or receiving the surveillance frame or the diagnostic frame transmitted from the network clients 200, 300, and 400. );
At least two network clients (200, 300 and 400) in response to signals transmitted from the network host (100); And
The network host 100 includes an Ethernet switch module 110 including a host side CPU 130 and a MAC address table 117, a ring port 1 111, and a ring port 2 112. It is possible to block or unblock the network by logically blocking the port 1 111 and the ring port 2 112 by the port VLAN method, and refer to the MAC address table 117 to obtain a MAC address without having a logical address. Emit surveillance frames 601 and 602,
Each of the at least two network clients 200, 300, and 400 includes a client side CPU 230 and a MAC address table 117, each of ring port 1 (111, 211, 311 and 411) and ring port 2 ( Ethernet switch module 210 including 112, 212, 312, and 412, respectively, and the ring port 1 111 and ring port 2 112 according to commands from the network host 100 are port VLANs. A real-time data transmission system with minimized time loss in a network configured in a ring topology, characterized in that it is possible to block the network or release the block by logically blocking by a method. The method of claim 1,
Each of the network host 100 and the at least two network clients 200, 300, and 400 further includes port VLAN control registers 118, 218 so that the port VLAN control registers 118, 218 may be MAC addresses. Ring topology characterized by generating and transmitting a diagnostic frame (603-607) for communicating between the network host 100 and the at least two network clients (200, 300 and 400) with reference to the table (117, 217) Real-time data transmission system with minimized time loss in a network configured in a form. The method of claim 1,
The ring port 1 111 of the network host 100 is connected to the ring port 2 212 of the first network client 200 of the at least two network clients 200, 300, and 400, and the network host Ring port 2 (112) of the 100 is connected to the ring port 1 (411) of the far end network client 400, the real-time data transmission system minimized in time loss in the network configured in the ring topology form. The method of claim 1,
The network host 100 further includes an AoIP frame generation module 140 that receives and digitizes an analog voice or audio signal and performs the function of loading the digitized information into a data area of an IP.
Each of the at least two network clients 200, 300, and 400 is a redundancy system of an AoIP network further comprising an analog sound source reproducing module 240 for reproducing an original analog voice or audio signal from the digitized information. Real-time data transmission system with minimum time loss in network consisting of ring topology. The method of claim 1,
The surveillance frames 601 and 602 are composed of a clockwise surveillance frame 601 and a counterclockwise surveillance frame 602 as a pair, and the transmission frequency of the surveillance frame has a hundred orders per second. Real-time data transmission system with minimal time loss in a network composed of topology.

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