CN113890779A - Access device for communication device and communication system - Google Patents
Access device for communication device and communication system Download PDFInfo
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- CN113890779A CN113890779A CN202111410874.0A CN202111410874A CN113890779A CN 113890779 A CN113890779 A CN 113890779A CN 202111410874 A CN202111410874 A CN 202111410874A CN 113890779 A CN113890779 A CN 113890779A
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- 238000004891 communication Methods 0.000 title claims abstract description 159
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
- H04L12/2858—Access network architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
- H04L41/0809—Plug-and-play configuration
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Abstract
The embodiment of the disclosure relates to an access device for a communication device and a communication system, and relates to the field of communication. The access device includes: the device comprises a first port, a second port, a third port and a fourth port, wherein the first port and the second port are used for being in communication connection with a plurality of first communication devices to form a network, the third port and the fourth port are used for being in communication connection with second communication devices, and the third port and the fourth port are hot-pluggable; and a control unit in communication with the first port, the second port, the third port, and the fourth port, the control unit configured to: if it is determined that the third port and the fourth port are communicatively connected to the second communication device, data received from the network via any one of the first port and the second port is forwarded to the other of the first port and the second port via the third port, the communication device, and the fourth port to be transmitted to the network. Therefore, the communication equipment can be accessed to the network in a hot-pluggable mode.
Description
Technical Field
Embodiments of the present disclosure generally relate to the field of communications, and in particular, to an access device for a communication device and a communication system.
Background
Conventional communication devices are all configured to form a network by performing network planning and connection in advance. If a new communication device needs to be added to the network or an existing communication device needs to be removed, the connection is always required to be rewired, which is very inconvenient.
Disclosure of Invention
An access device and a communication system for a communication device are provided, which enable the communication device to access a network in a hot-pluggable manner.
According to a first aspect of the present disclosure, an access device for a communication device is provided. The access device includes: the device comprises a first port, a second port, a third port and a fourth port, wherein the first port and the second port are used for being in communication connection with a plurality of first communication devices to form a network, the third port and the fourth port are used for being in communication connection with second communication devices, and the third port and the fourth port are hot-pluggable; and a control unit in communication with the first port, the second port, the third port, and the fourth port, the control unit configured to: if it is determined that the third port and the fourth port are communicatively connected to the second communication device, data received from the network via any one of the first port and the second port is forwarded to the other of the first port and the second port via the third port, the second communication device, and the fourth port to be transmitted to the network.
According to a second aspect of the present disclosure, there is provided a communication system comprising: an access device according to the first aspect of the present disclosure; and a plurality of first communication devices communicatively coupled to the first port and the second port of the access device to form a network.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements.
Fig. 1 is a schematic diagram of a communication system 100 in accordance with an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a communication system 200 according to an embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of the embodiments of the disclosure are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
As described above, the conventional scheme requires rewiring connection when adding a new communication device to the network or removing an existing communication device, which is inconvenient. In addition, in a network such as a ring type or a line type, data transmission is generally performed by forwarding each communication device, each communication device needs to perform clock synchronization with a master clock device, and a slave device's own clock is adjusted by calculating a line delay with the master clock device. When one communication device in the network is powered off, the communication device cannot forward data any more, and the communication line is switched to the bypass channel. The data in the bypass path is straight-through, the time for the data to reach the next device becomes faster, and if the slave device still calculates its time according to the old line delay, the clock synchronization precision is reduced. Similarly, when a communication device is newly powered on from a power-off state, the communication line is switched from the original bypass channel to the forwarding channel of the communication device, and the time for data to reach the next device is reduced. If the delay is delayed according to the previous line, the transmission time slices between two communication devices can be overlapped, and communication errors can be caused. And if the line delay calculation is carried out again, the communication of the original communication equipment is interrupted.
To address, at least in part, one or more of the above problems and other potential problems, example embodiments of the present disclosure propose an access device for a communication device. The access device includes: the device comprises a first port, a second port, a third port and a fourth port, wherein the first port and the second port are used for being in communication connection with a plurality of first communication devices to form a network, the third port and the fourth port are used for being in communication connection with second communication devices, and the third port and the fourth port are hot-pluggable; and a control unit in communication with the first port, the second port, the third port, and the fourth port, the control unit configured to: if it is determined that the third port and the fourth port are communicatively connected to the second communication device, data received from the network via any one of the first port and the second port is forwarded to the other of the first port and the second port via the third port, the second communication device, and the fourth port to be transmitted to the network. According to the embodiment of the disclosure, the communication equipment can be accessed to the network in a hot-pluggable manner, and the new communication equipment can be conveniently accessed to the network or the existing communication equipment can be conveniently removed.
Hereinafter, specific examples of the present scheme will be described in more detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of an example of a communication system 100 according to an embodiment of the present disclosure. As shown in fig. 1, the communication system 100 includes an access device 110 for a communication device, a plurality of first communication devices 120-1 to 120-3 (hereinafter, the first communication devices are collectively referred to as 120), and a second communication device 130. It should be understood that although 3 first communication devices are shown in fig. 1, this is by way of example only and the number of the plurality of first communication devices may be greater or less.
The access device 110 includes a first port a, a second port B, a third port C, and a fourth port D. The first port a and the second port B are used to communicatively connect with a plurality of first communication devices 120 to form a network. The third port C and the fourth port D are for communicative connection with a second communication device 130. The second communication device 130 may be used to configure, monitor, function/performance test, etc. the network. It should be understood that although fig. 1 shows the network as a ring network, this is only an example and the network may be a line type.
In some embodiments, the plurality of first communication devices 120 and the second communication device 130 are implemented as epa (ethernet for Plant automation) devices. The network formed is an EPA network. In other embodiments, the plurality of first communication devices 120 and second communication devices 130 may be configured to utilize IEEE1588 for synchronization. It should be understood that the first communication device and the second communication device are merely illustrative and that other types of communication devices may be used.
As shown in fig. 1, a plurality of first communication devices 120 are communicatively coupled to a first port a and a second port B of an access device 110 to form a network. The second communication device 130 is communicatively coupled to the third port C and the fourth port D of the access device 110. The third port C and the fourth port D are, for example, hot-pluggable.
The access device 110 further comprises a control unit 111. The control unit 111 is in communication connection with the first port a, the second port B, the third port C, and the fourth port D. The control unit 111 may be implemented by, for example, a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
The control unit 111 may be configured to determine whether the third port C and the fourth port D are communicatively connected with the second communication device 130. For example, if the second communication device 130 is powered on, the third port C and the fourth port D are communicatively connected to the second communication device 130, and if the second communication device 130 is powered off, the third port C and the fourth port D are communicatively disconnected from the second communication device 130. Furthermore, if the second communication device 130 is unplugged from the third port C and the fourth port D of the access device 110, the third port C and the fourth port D are disconnected from the second communication device 130.
The control unit 111 may be configured to forward data received from the network via any one of the first port a and the second port B to the other one of the first port a and the second port B via the third port C, the second communication device 130 and the fourth port D for transmission to the network if it is determined that the third port C and the fourth port D are communicatively connected with the second communication device 130.
Specifically, the control unit 111 may be configured to receive the first data from the first communication device 120-1 communicatively connected with the first port a via the first port a and forward the first data to the third port C so that the second communication device 130 receives the first data and forwards to the fourth port D, if it is determined that the third port C and the fourth port D are communicatively connected with the second communication device 130. The control unit 111 may also be configured to receive the first data from the second communication device 130 via the fourth port D and forward the first data received via the fourth port D to the second port B for transmission to the first communication device 120-3 communicatively connected to the second port B.
Alternatively or additionally, the control unit 111 may be further configured to receive second data from the first communication device 120-3 communicatively connected with the second port B via the second port B and to forward the second data to the fourth port D, so that the second communication device 130 receives the second data and forwards to the third port C, if it is determined that the third port C and the fourth port D are communicatively connected with the second communication device 130. The control unit 111 may also be configured to receive second data from the second communication device 130 via the third port C and forward the second data received via the third port C to the first port a for transmission to the first communication device 120-1 communicatively connected to the first port a.
Therefore, the communication equipment can be accessed to the network in a hot-pluggable manner through the access equipment, and the new communication equipment can be conveniently accessed to the network or the existing communication equipment can be conveniently removed from the network.
In some embodiments, the control unit 111 may be further configured to obtain a time delay for data to be forwarded from either of the first port a and the second port B to the other of the first port a and the second port B via the third port D, the second communication device 130 and the fourth port D, if it is determined that the third port C and the fourth port D are communicatively connected with the second communication device 130. The latency includes, for example, a first latency of data from first port a- > third port C- > second communication device 130- > fourth port D- > second port B, and/or a second latency of data from second port B- > fourth port D- > second communication device 130- > third port C- > first port a.
The control unit 111 may be further configured to delay forwarding of data received from the network via either one of the first port a and the second port B to the other one of the first port a and the second port B for transmission to the network, if it is determined that the third port C and the fourth port D are disconnected from the communication connection with the second communication device 130 (e.g. due to the second communication device 130 being powered off or being unplugged from the access device 110). For example, data received from the network via the first port a is forwarded to the second port B with the acquired first delay delayed for transmission to the network. Further, for example, data received from the network via the second port B is forwarded to the first port a with the acquired second delay delayed, to be transmitted to the network.
Therefore, when the communication equipment is accessed, the data message is forwarded through the communication equipment, a forwarding delay is generated, after the communication equipment is removed, the data is forwarded through the access equipment instead, and the access equipment can simulate the same forwarding delay as the communication equipment, so that the purpose of doing so is that the access and the separation of the communication equipment can not influence the overall line delay of the network, the operation stability of a communication system can be greatly improved, and the sudden change of the line delay caused by a traditional bypass device can be reduced, so that the normal communication of the system is influenced.
Fig. 2 shows a schematic diagram of an example of a communication system 200 according to an embodiment of the present disclosure. As shown in fig. 2, the communication system 200 includes an access device 210 for a communication device and a plurality of first communication devices 220-1 to 220-3 (hereinafter, the first communication devices are collectively referred to as 220). It should be understood that although 3 first communication devices are shown in fig. 1, this is by way of example only and the number of the plurality of first communication devices may be greater or less.
The access device 210, the first communication device 220, the control unit 211, the first port a, the second port B, the third port C, and the fourth port D are similar to those in fig. 1 and are not described again. The difference with respect to fig. 1 is that the second communication device is no longer included in the communication system 200, e.g. the second communication device is pulled out from the third port C and the fourth port D of the access device 210.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. An access device for a communication device, comprising:
the device comprises a first port, a second port, a third port and a fourth port, wherein the first port and the second port are used for being in communication connection with a plurality of first communication devices to form a network, the third port and the fourth port are used for being in communication connection with second communication devices, and the third port and the fourth port are hot-pluggable; and
a control unit in communication with the first port, the second port, the third port, and the fourth port, the control unit configured to:
if it is determined that the third port and the fourth port are communicatively connected to the second communication device, data received from the network via any one of the first port and the second port is forwarded to the other of the first port and the second port via the third port, the second communication device, and the fourth port to be transmitted to the network.
2. The access device of claim 1, wherein the control unit is further configured to:
if the third port and the fourth port are determined to be in communication connection with the second communication device, acquiring the time delay of the data forwarded from any one of the first port and the second port to the other one of the first port and the second port through the third port, the second communication device and the fourth port; and
if it is determined that the third port and the fourth port are disconnected from the second communication device, delaying the acquired delay for forwarding data received from the network via the any one of the first port and the second port to the other one of the first port and the second port for sending to the network.
3. The access device of claim 1, wherein the control unit is further configured to:
if it is determined that the third port and the fourth port are communicatively connected with the second communication device:
receiving first data from a first communication device communicatively connected to the first port via the first port;
forwarding the first data to the third port so that the second communication device receives the first data and forwards the first data to the fourth port;
receiving the first data from the second communication device via the fourth port; and
forwarding the first data received via the fourth port to the second port for transmission to a first communication device communicatively connected to the second port.
4. The access device of claim 1, wherein the control unit is further configured to:
if it is determined that the third port and the fourth port are communicatively connected with the second communication device:
receiving second data from a first communication device communicatively connected to the second port via the second port;
forwarding the second data to the fourth port so that the second communication device receives the second data and forwards the second data to the third port;
receiving the second data from the second communication device via the third port; and
forwarding the second data received via the third port to the first port for transmission to a first communication device communicatively connected to the first port.
5. The access device of any of claims 1-4, wherein the network comprises a ring network or a line network.
6. The access device of any of claims 1-4, wherein the plurality of first communication devices and the second communication device are implemented as EPA devices.
7. A communication system, comprising:
the access device of any one of claims 1-6; and
a plurality of first communication devices communicatively coupled to the first and second ports of the access device to form a network.
8. The communication system of claim 7, further comprising a second communication device communicatively coupled to the third port and the fourth port of the access device.
9. The communication system of claim 7, wherein the plurality of first communication devices are implemented as EPA devices.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111410874.0A CN113890779A (en) | 2021-11-25 | 2021-11-25 | Access device for communication device and communication system |
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| CN202111410874.0A CN113890779A (en) | 2021-11-25 | 2021-11-25 | Access device for communication device and communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115882996A (en) * | 2023-02-14 | 2023-03-31 | 浙江国利信安科技有限公司 | Clock synchronization method, apparatus and medium |
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