RU119964U1 - FOUR-PORT RESERVATION DEVICE FOR COMMUNICATION NETWORK AND COMMUNICATION NETWORK WITH SUCH DEVICE - Google Patents

Abstract

1. A four-port redundancy device containing two interconnected data packet switches, each of which connects two data transmission ports, and a clock synchronization unit, to which the output of an external synchronization signal receiver, outputs of four receivers and inputs of four clock transmitters are connected, while the clock synchronization unit is configured to generate a clock signal synchronized by the output signals of the receivers with the introduction of a fixed signal delay of each of the receivers, to issue the generated clock signal to the inputs of the clock transmitters and to transmit clock signals from the outputs of at least two clock receivers to the inputs of the corresponding transmitters. ! 2. The device according to claim 1, characterized in that it is provided with a configuration interface with the ability to set the modes of receivers and transmitters of clock signals, the delay values of the receiver signals and enable or disable the transmission of clock signals. ! 3. A communication network containing at least two ring networks, each of which includes nodes in which data transmission ports, receivers and transmitters of clock signals are located, and single-wire segments for data transmission and two-wire segments for clock transmission, connected through these nodes. synchronization, while the communication network contains a four-port device according to claim 1 or 2, included in each of the ring networks as its node. ! 4. The communication network according to claim 3, characterized in that the single-wire and two-wire segments are at least me

Description

FIELD OF TECHNOLOGY

The utility model relates to the field of building communication networks of data transmission with redundancy and can be used in automation systems of power facilities built according to the international standard IEC61850 [1] with increased requirements for the accuracy of time synchronization. In particular, the proposed four-port device can be used to pair a pair of ring networks into a common communication network operating according to the HSR protocol of the international standard IEC 62439-3 [2].

BACKGROUND

A four-port backup device is known for pairing two ring networks into a single communication network, and a communication network with such a device [2]. At the same time, ring redundancy of data transmission is provided in the integrated network.

Synchronization of data transmission in a known device is carried out through the use of specific rules for the transmission of data packets, which does not allow for the increased requirements for synchronization accuracy imposed by the IEC61850 standard (for example, in accordance with classes T4 or T5 of the specified standard, the synchronization accuracy should be no worse than ± 4 μs or ± 1 μs, respectively).

DISCLOSURE OF A USEFUL MODEL

The technical result of the utility model is to increase the accuracy of clock synchronization during data transmission in a communication network with redundancy, formed by pairing at least two ring networks. If a utility model is used in an energy facility automation system built in accordance with IEC 61850, synchronization accuracy in accordance with T5 class is ensured.

The above technical result is achieved due to the fact that:

- in a four-port backup device containing two interconnected switches of data packets, each of which is connected to two data transmission ports, and a clock synchronization unit, four receivers and four clock transmitters, and an external synchronization signal receiver are additionally introduced, while the outputs of the receivers and the inputs of the transmitters are connected to the clock synchronization unit, which is configured to generate a clock signal synchronized with the output signals of the clock receivers ignalov with the introduction of a fixed delay for each of the receivers and outputting the generated signal to the transmitter input, and with the possibility of translation of the output signals of at least two receivers, clock signals to the inputs of respective transmitters.

- a communication data network contains at least two ring networks, each of which includes nodes that host data ports, clock receivers and transmitters, connected through these nodes, single-wire segments for transmitting data and two-wire segments for transmitting clock synchronization , while the communication network contains the proposed four-port redundancy device included in each of these ring networks as its node.

Utility model developments provide that:

- the device can be equipped with a configuration interface that provides the ability to set the modes of the receivers and transmitters of clock signals, delay values of the output signals of the receivers and enable or disable the broadcast of clock signals between receivers and transmitters designed to connect to the ring communication network of the same name. This provides greater flexibility in configuring the functioning of the backup devices at a particular object, and the ability to configure the delay values of the output signals of the receivers can further increase the provided accuracy of clock synchronization;

- single-wire and two-wire segments, at least between two adjacent nodes are made by a single three-wire cable. This provides an additional reduction in the number of cables used to interconnect the network nodes of the communication network, which reduces the cost of its installation and operation.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a diagram of the proposed CHUR.

Figure 2 shows an exemplary diagram of the proposed communication network with two ring networks connected by the proposed CHUR.

IMPLEMENTATION OF A USEFUL MODEL TAKING INTO ACCOUNT ITS DEVELOPMENT

CHUR 1 contains (see figure 1):

- two switches 2 data packets interconnected;

- two communication ports 3, interconnected by a switch 2 and intended for the first ring network;

- two communication ports 4, interconnected by another switch 2 and intended for the second ring network;

- block 5 clock synchronization;

- the first 6 and second 7 clock receivers designed for the first ring network;

- the first 8 and second 9 clock transmitters for the first ring network;

- the first 10 and second 11 clock receivers for the second ring network;

- the first 12 and second 13 transmitters of clock signals for the second ring network;

- receiver 14 external synchronization;

- configuration interface 15.

Part of CHUR 1, which includes a pair of communication ports 3, a pair of communication ports 4 and two connected data packet switches 2, functions similarly to the QuadBox devices described in [2]. The work of the rest of the CHUR, including block 5, receivers 6, 7, 10, 11 and 14, transmitters 8, 9, 12 and 13 is described below.

Receivers 6, 7, 10, 11, and 14 receive clock signals from external communication channels and transmit the received signals to block 5. Transmitters 8, 9, 12, and 13 transmit the clock synchronization signal received from block 5 to the corresponding ring networks. Moreover, both receivers 6, 7, 10, 11, and 14, as well as transmitters 8, 9, 12, and 13, provide an almost deterministic time for the execution of the clock signal translation operation with an uncertainty of the operation time not exceeding ± 0.01 μs.

The operation of block 5 clock synchronization depends on the selected operating mode CHUR, which allows you to work in one of two modes: source mode and repeater mode of clock synchronization signals.

When the CHUR is in the source mode of clock synchronization, block 5 as part of device 1 performs the following functions:

- receives the external signal by the receiver 14 and introduces a fixed delay of the output signal for this receiver;

- generates a clock signal synchronized by the delayed output signal of the receiver 14;

- gives the generated signal to the transmitters 8, 9, 12 and 13.

This ensures the continuous formation of the internal time scale, its correction due to synchronization by the delayed signal of the receiver 14, the formation and transmission of the output signal of clock synchronization to transmitters 8, 9, 12 and 13.

The introduction of a fixed delay compensates for the time of delivery of the clock signal from an external synchronization source over the communication channel to the CHUR device. The value of the specified delay can be from zero to several microseconds and must be set with a resolution of not more than 0.25 μs.

When the CHUR is operating in the repeater mode of the clock synchronization signals, the operation of the clock synchronization unit 5 depends on the location of the clock synchronization source, which can be located in both the first and second ring communication networks to which this CHUR device is connected.

When a clock synchronization source is located in the first ring communication network, block 5 receives clock signals from the receivers 6 and 7; when a clock synchronization source is located in the second ring communication network, from receivers 10 and 11, respectively;

When the source of clock synchronization is located in the first ring communication network, the clock signal received from receiver 6 is transmitted to transmitter 9, and the clock signal received from receiver 7 is transmitted to transmitter 8. When the source of clock synchronization is located in the second ring communication network, the clock signal is transmitted received from the receiver 10 to the transmitter 13, and a signal received from the receiver 11 to the transmitter 12.

When performing the above-described translations of the clock signal, block 5 provides an almost deterministic time for the execution of individual broadcast operations of the clock signal (with the uncertainty of the time taken to complete the broadcast operation from the receiver to the corresponding transmitter of not more than ± 0.1 μs).

When operating CHUR in repeater mode, block 5 performs the following functions:

- introduces a fixed output delay for receivers 6 and 7 or receivers 10 and 11;

- generates a clock signal synchronized by the delayed output signals of the respective receivers;

- provides the generated signal to the respective transmitters.

This ensures the continuous formation of the internal time scale, its correction due to synchronization by delayed signals of receivers 6 and 7 or receivers 10 and 11, the formation and transmission of the output clock synchronization signal to transmitters 12 and 13 or transmitters 8 and 9, depending on which ring network is the source of clock synchronization.

The introduction of a fixed delay of the signals of the receivers in this mode also provides compensation for the time of delivery of the clock signal from the external synchronization source via the communication channel to the CHUR device.

The configuration interface 15 enables the external workstation to be connected to the CHUR to configure the device, in particular, to configure the functioning of the clock synchronization unit 5. When configuring CHUR via interface 15, it is provided:

- setting the operating mode of the CHUR — the source mode or the repeater mode of the clock synchronization signals, and also in the case of selecting the repeater mode — setting the location of the clock synchronization source (in the first or second ring communication network);

- setting the delay values of the output signals for each of the receivers 6, 7, 10, 11 and 14.

In the case of setting the operation of the CHUR in the source mode, one receiver 14 is set as the receiver of the synchronization signal, the prohibition of broadcasting signals between all pairs of receivers and transmitters connected to the first and second ring communication networks (receiver-transmitter pairs 6-9, 7-8, 10-13, 11-12).

In the case of setting the operation of the CHUR in the repeater mode and setting the location of the clock synchronization source in the first ring communication network, receivers 6 and 7 are installed as synchronization signal receivers, the resolution of synchronizing signal transmission between pairs of receivers and transmitters 6-9 and 7-8 is set, and broadcast prohibition between pairs of receivers and transmitters 10-13 and 11-12. In the case of setting the operation of the CHUR in the repeater mode and setting the location of the clock synchronization source in the second ring communication network, receivers 10 and 11 are installed as synchronization signal receivers, the synchronization signals broadcast resolution is set between pairs of receivers and transmitters 10-13 and 11-12 and broadcast prohibition between pairs of receivers and transmitters 6-9 and 7-8;

The receivers 6, 7, 10, 11 and 14 and the transmitters 8, 9, 12 and 13 in the CHUR device can be implemented on the basis of standard optical receivers and transmitters, for example, HFBR-24 × 6Z and HFBR-1712TZ from the manufacturer Avago Technologies. Block 5 clock synchronization can be performed on the basis of a programmable logic integrated circuit (FPGA) and highly stable crystal oscillator. The configuration interface 15 can be performed on the basis of a standard Ethernet interface (IEEE 802.3).

FIG. 2 shows an example of building a redundant communications network including two ring communications networks connected by the four-port redundancy device shown in FIG. The communication network contains:

- external source 16 clock synchronization signals;

- single-wire segments 17 and 18 for data transmission in the first and second ring network, respectively;

- two-wire segments 19 and 20 for bi-directional transmission of clock signals in the first and second ring network, respectively;

- a four-port backup device 1 connected to segments 17, 19 of the first ring network and to segments 18 and 20 of the second ring network and, therefore, included in each ring network as its node;

- intelligent electronic devices 21 that support the inclusion of a ring communication network directly (without using intermediate backup devices);

- intelligent electronic devices 22 that do not support inclusion in a ring communication network, and are included in the rings 17 and 18 through nodes 23;

The network shown in figure 2, in terms of data transmission operates according to [2], and in terms of transmission of clock synchronization signals as follows.

The clock synchronization signal enters the first ring network (with segments 19) from an external source 16 (which, for example, can be a system for providing a single time of an energy object) through one of the nodes 23, which operates in the source mode, generating and sending a clock signal synchronization with other devices of the first ring network connected by segments 19, as well as with an intelligent electronic device 22 connected to the first ring network through this node 23. Other nodes 23 in the first ring network with the study of the clock synchronization signal from the neighboring node 23 relay the specified signal to another neighboring node 23, thus providing bidirectional transmission of the clock signal over the segments 19.

CHUR 1 retransmits clock synchronization signals from the first ring network, to which the source of clock signals 16 is connected, to the second network, the nodes of which are connected by segments 20. At the same time, ring redundancy of both data and clock synchronization signals is provided in the integrated network.

Segments 19 and 20 for bi-directional transmission of clock signals can be implemented, for example, on the basis of fiber-optic signal transmission networks 1PPS ("one-pulse-per-second"). At the same time, if the nodes 22 and CHUR fulfill the compensation of the time of delivery of the clock signal from the signal source to the receiver with the discreteness of the task, the values of the time compensation are not more than 0.25 μs and taking into account the above allowable values of the uncertainties of the delays provided by the nodes 22 and the ChUR during clock broadcasting signals (± 0.01 μs is the delay uncertainty introduced by the receiver or transmitter, ± 0.1 μs is the delay uncertainty introduced by the device clock synchronization unit when broadcasting from the receiver to the feeder) ensures the accuracy of the clock synchronization of devices in the communication network is not worse than ± 1 μs.

INFORMATION SOURCES

1. IEC 61850-5 “Communication systems and networks in substations. Part 5. Communication requirements for the performance of functions and equivalent circuits of (electronic) devices. ” 2003 (electronic resource). Access mode http://www.standards.ru/document/3643715.aspx

2. IEC 62439-3 “Industrial communication networks. Networks with high readiness for automatic processing. Part 3. Parallel Redundancy Protocol (PRP) and High Availability Seamless Redundancy (HSR). ” 2010 (electronic resource). Access mode: http://www.standards.ru/document/4561443.aspx.

Claims (4)

1. A four-port redundancy device containing two interconnected data packet switches, each of which connects two data transmission ports, and a clock synchronization unit, to which the output of the external synchronization signal receiver, the outputs of four receivers and the inputs of four clock transmitters are connected, while the clock synchronization unit is configured to generate a clock signal synchronized by the output signals of the receivers with the introduction of a fixed signal delay of each and receivers provide the generated clock signal to the inputs of clock signals of transmitters and with the possibility of translation of clock signals from the outputs of the at least two receivers, clock signals to the inputs of respective transmitters. 2. The device according to claim 1, characterized in that it is equipped with a configuration interface with the ability to set the modes of the receivers and transmitters of the clock signals, the delay values of the signals of the receivers and enable or disable the broadcast of clock signals. 3. A communication network containing at least two ring networks, each of which includes nodes that host data ports, clock receivers and transmitters, and single-wire segments for transmitting data and two-wire segments for transmitting clocks connected through these nodes synchronization, while the communication network contains a four-port device according to claim 1 or 2, included in each of the ring networks as its node. 4. The communication network according to claim 3, characterized in that the single-wire and two-wire segments, at least between two adjacent nodes are made by a single three-wire cable.