CN110912611A - SFP transmission system based on distributed synchronous time service technology - Google Patents
SFP transmission system based on distributed synchronous time service technology Download PDFInfo
- Publication number
- CN110912611A CN110912611A CN201911199194.1A CN201911199194A CN110912611A CN 110912611 A CN110912611 A CN 110912611A CN 201911199194 A CN201911199194 A CN 201911199194A CN 110912611 A CN110912611 A CN 110912611A
- Authority
- CN
- China
- Prior art keywords
- sfp
- copper
- golden finger
- equalizer
- buffer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to an SFP transmission system based on a distributed synchronous time service technology. The system WR master switch, the first copper SFP transceiver, the second copper SFP transceiver and the WR slave switch; the data of the WR master switch reaches the WR slave switch through a first golden finger in the first copper SFP transceiver, a first buffer in the first copper SFP transceiver, a second equalizer in the second copper SFP transceiver and a second golden finger in the second copper SFP transceiver; data of the WR slave switch reaches the WR master switch through a second buffer in a second copper SFP transceiver of a second gold finger in a second copper SFP transceiver, a first equalizer in a first copper SFP transceiver, and a first gold finger in a first copper SFP transceiver. The invention provides an SFP transmission system based on a distributed synchronous time service technology, which solves the problem of high cost caused by using an optical SFP transceiver and optical fiber transmission in WR application in the prior art.
Description
Technical Field
The invention relates to the field of distributed clock distribution, in particular to an SFP transmission system based on a distributed synchronous time service technology.
Background
In a distributed system, to avoid confusion caused by misplacement of the event recording sequence, it is necessary that all sub-modules use a uniform and accurate clock, and thus, clock synchronization is also required. In large distributed systems, a special clock synchronization system is required to ensure that all devices in the system operate at the same time. At present, the time synchronization system in a large range mainly has three types of realization methods: over radio waves, over dedicated links, over ethernet. Taking GPS/GNSS as an example, the radio wave is used as a medium, the object of clock synchronization is time or frequency, and the time synchronization precision is about 20 ns.
Wr (whiterabbitt) synchronous ethernet is based on ethernet, clock synchronization is targeted for time and frequency, data is transmitted in a fast, deterministic and secure manner, and the general problem of clock synchronization can be solved. Wr (whiterabbitit) is a distributed synchronous time service technology developed by integrating synchronous ethernet, a precision timing protocol (IEEE1588v2) and a digital phase measurement technology, and can realize multi-node sub-nanosecond precision clock distribution within a kilometer range, realize frequency phase locking and sub-nanosecond level time synchronization among long-distance multi-nodes, and ensure realization of global synchronous data acquisition and control process. WR (white Rabbit) is based on widely used Ethernet technology, does not occupy extra bandwidth, is compatible with the original Ethernet, and can realize high-precision frequency source broadcasting and sub-nanosecond time synchronization among as many as ten thousand nodes. The technology has high synchronization precision, good compatibility and low cost, and can automatically calibrate the delay variation caused by the optical fiber length and the environmental parameters. The WR (WhiteRabbit) synchronization precision in the global subnanosecond is improved by 1-2 orders of magnitude compared with the GPS, the indexes of the existing network synchronization technology are improved by one order of magnitude, and the WR (WhiteRabbit) can be widely applied to various occasions such as distributed network measurement and control, industrial automation control, distributed base stations, remote radio frequency systems, power grid synchronization, adaptive array antennas, multi-base radars, indoor positioning and the like.
The existing WR switch realizes the function of data grading and summarizing, improves the stability of data transmission delay in a large-scale network, and simultaneously enables the network to be suitable for the application of large-data-volume transmission; in the design of a time service system, high-precision clock synchronization (the synchronization precision is in a subnanosecond level), high-reliability data transmission and user self-defining functions are integrated; the dual-port WR clock synchronization and data transmission functions are realized, a serial topology or a ring topology is supported, and a network structure can be more flexible.
Currently, optical SFP transceivers and optical fibers are used in wr (whiterabbitt) applications. The optical SFP transceivers are required to use several specific model transceivers of specific manufacturers, such as LS48-C3S-TC-N-B4 and LS38-C3S-TC-N-B9 of APACOptoelectronics, AXGE-3454 0531[ OLT ] (violet) and AXGE-1254 0531[ ONU ] (blue) of AxcenPhotonics, and the like; the optical fiber uses a single optical fiber that can transmit data in both directions. The optical SFP transceiver and optical fiber should be compatible with 1000 BASE-BX 10. Therefore, the optical fiber SFP includes only the laser driver and the photodiode receiver. Fiber SFP can achieve the same protocol and timing of the output and input, but when the distance is short, the use of fiber transmission can greatly increase the cost of the overall transmission system.
When data transmission is performed in a short distance, a copper cable is connected with an SFP for data transmission in the prior art. However, 1000base-t or 1000base-txSFP existing in the market uses an internal local clock, and the SFP standard does not provide an external clock interface, which causes the data of the SFP to be asynchronous with the SFP external clock, that is, the input and the output of the existing gigabit SFP have different physical layer protocols, resulting in an uncertain timing relationship between the input and the output. Existing copper SFPs require a conversion of the 1000Base-X used by WR hosts to the more complex 1000Base-T physical layer protocol. The conversion between protocols involves retiming the data, retaining the data packets, but losing the reference frequency encoded in the 1000Base-X carrier. Since the PHY internal to the SFP is clocked by the SFP's internal oscillator. In addition, the SFP standard does not anticipate the external clock input of the SFP and does not have an SFP that can operate in synchronization with the external clock. Therefore, when the existing gigabit SFP is used, the WR host cannot maintain a predetermined timing relationship with data on a copper cable or an optical fiber, and thus cannot be applied to the WR system.
If a passive direct connection SFP copper cable or a direct connection cable (DAC) is adopted, although a transmission protocol is not changed, data on the cable and a host can keep a certain timing relationship, and the system has good timing performance, but a transmission distance is very short, so that the system cannot be applied to a WR system.
Disclosure of Invention
The invention aims to provide an SFP transmission system based on a distributed synchronous time service technology, which aims to solve the problem of high cost caused by using an optical SFP transceiver and optical fiber transmission in WR application in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
an SFP transmission system based on distributed synchronous time service technology comprises: a WR master switch, a first copper SFP transceiver, a second copper SFP transceiver, and a WR slave switch;
the first copper SFP transceiver comprises a first golden finger, a first buffer and a first equalizer;
the second copper SFP transceiver comprises a second gold finger, a second buffer and a second equalizer
The data output end of the WR main switch is connected with the data receiving end of the first golden finger; the output end of the first golden finger is connected with the input end of the first buffer, the output end of the first buffer is connected with the input end of the second equalizer, and the output end of the second equalizer is connected with the input end of the second golden finger; the data transmitting end of the second golden finger is connected with the data input end of the WR slave switch;
the data output end of the WR slave switch is connected with the data receiving end of the second golden finger; the output end of the second golden finger is connected with the input end of the second buffer; the output end of the second buffer is connected with the input end of the first equalizer, the output end of the first equalizer is connected with the input end of the first golden finger, and the data sending end of the first golden finger is connected with the data input end of the WR main switch.
Optionally, the first copper SFP transceiver is connected to the second copper SFP transceiver through a CAT7 network cable.
Optionally, the output of the first buffer is connected to the input of the second equalizer through the first twisted pair of the CAT7 network;
the output of the second buffer is connected to the input of the first equalizer through a second twisted pair of the CAT7 mesh.
Optionally, the model of the first buffer and the model of the second buffer are both DS15BA 101.
Optionally, the model of the first equalizer and the model of the second equalizer are both DS15EA 101.
Optionally, the first copper SFP transceiver further includes a first information storage chip; the first information storage chip is connected with the first golden finger and used for reading data in the first golden finger and storing the read information;
the second copper SFP transceiver further comprises a second information storage chip; the second information storage chip is connected with the second golden finger and used for reading data in the second golden finger and storing the read information.
Optionally, the first copper SFP transceiver and the second copper SFP transceiver each further include a metal package housing.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the SFP transmission system based on the distributed synchronous time service technology, the golden finger, the buffer and the equalizer are arranged in the SFP, a local clock is not needed, extra uncertain time quantum is not introduced, stable time synchronization and data exchange of 1000base-t or 1000base-txSFP are realized, and the system can be applied to a WR system. Therefore, the mode of connecting the copper SFP transceiver with the copper cable is used for replacing the mode of connecting the optical fiber SFP transceiver with the optical fiber to realize synchronous data transmission, and the cost of the system is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an SFP transmission system based on a distributed synchronous time service technology according to the present invention;
FIG. 2 is a schematic diagram of a copper SFP transceiver according to the present invention;
fig. 3 is a schematic diagram of a lead of a gold finger provided by the present invention.
Description of the symbols:
101-WR master switch, 102-first copper SFP transceiver, 103-second copper SFP transceiver, 104-WR slave switch, 201-gold finger, 202-buffer, 203-equalizer, 204-information storage chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an SFP transmission system based on a distributed synchronous time service technology, which aims to solve the problem of high cost caused by using an optical SFP transceiver and optical fiber transmission in WR application in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of an SFP transmission system based on a distributed synchronous time service technology, as shown in fig. 1, the SFP transmission system based on the distributed synchronous time service technology includes: WR master switch 101, first copper SFP transceiver 102, second copper SFP transceiver 103, and WR slave switch 104.
The first copper SFP transceiver 102 includes a first gold finger, a first buffer, and a first equalizer.
The second copper SFP transceiver 103 includes a second gold finger, a second buffer, and a second equalizer.
The data output end of the WR master switch 101 is connected with the data receiving end of the first golden finger; the output end of the first golden finger is connected with the input end of the first buffer, the output end of the first buffer is connected with the input end of the second equalizer, and the output end of the second equalizer is connected with the input end of the second golden finger; the data sending end of the second gold finger is connected to the data input end of the WR slave switch 104.
The data output end of the WR slave switch 104 is connected with the data receiving end of the second golden finger; the output end of the second golden finger is connected with the input end of the second buffer; the output end of the second buffer is connected with the input end of the first equalizer, the output end of the first equalizer is connected with the input end of the first golden finger, and the data sending end of the first golden finger is connected with the data input end of the WR main switch 101.
The first copper SFP transceiver 102 and the second copper SFP transceiver 103 have the same structure, and as shown in fig. 2, the copper SFP transceiver includes a gold finger 201, a buffer 202, and an equalizer 203.
The structure of the gold finger 201 is shown in fig. 3, and the gold finger 201 includes a plurality of pins. The size data of the golden finger 201 is obtained from the SFPMSA standard; the signal in the gold finger 201 conforms to the signal specified in the SFP MSA standard.
In order to improve the interference resistance of data during transmission, the first copper SFP transceiver 102 is connected with the second copper SFP transceiver 103 through a CAT7 network. The CAT7 network includes 4 twisted pairs, each pair having a shield, and a common shield outside the four twisted pairs.
Data is transferred between the first copper SFP transceiver 102 and the second copper SFP transceiver 103 via two pairs of twisted pairs of the CAT7 network, the other two pairs being used for remote power. Specifically, the output of the first buffer is connected to the input of the second equalizer through the first twisted pair of the CAT7 network. The output of the second buffer is connected to the input of the first equalizer through a second twisted pair of the CAT7 mesh.
For signal compensation of the serial data stream on the twisted pair, the first buffer and the second buffer are both of the type DS15BA 101. DS15BA101 is a high-speed differential buffer for cable drive, level conversion, signal buffering, and signal relay applications. With differential signals, excellent signal integrity and interference immunity can be ensured. Differential and single-ended transmission lines can be driven at data rates in excess of 1.5 Gbps. The DS15BA101 uses 3.3V power supply and is compatible with the SFPMSA protocol. When the data rate is 1.5Gbps, the power consumption is 150 mW. And DS15BA101 can normally work at-40 ℃ to +85 ℃.
Also for signal compensation of the serial data stream on the twisted pair, the first equalizer model and the second equalizer model are both DS15EA 101. The DS15EA101 chip is an adaptive equalizer and is optimized for the equalization effect of data transmission through a copper cable. The DS15EA101 can work in a wide data range of more than 150Mbps to 1.5Gbps, and can automatically adjust the equalization effect of signals in a cable range from 0 meter to a certain length. The DS15EA101 supports input of single-ended and differential data and has an LOS signal function, which can detect whether or not input by a signal. The DS15EA101 chip also uses 3.3V power. When the data rate is at 1.5Gbps, the power consumption is 210 mW. And the chip can normally work at-40 ℃ to +85 ℃.
Specifically, the DS15EA101 chip of the invention has an LOS detection function. The external host can directly monitor LOS signals on the copper SFP golden finger; the DS15EA101 chip sets the LOS signal low if the chip determines that valid information is received, and sets the LOS signal high if the chip determines that valid information is not received.
In the SFP transmission system based on the distributed synchronous time service technology, the LOS signal of the DS15EA101 chip and the LOS signal of the gold finger are bound and sent to the WR master switch 101(WR slave switch 104), and the WR master switch 101(WR slave switch 104) judges the LOS signal.
In a particular embodiment, the copper SFP transceiver also includes an information storage chip 204. Specifically, the first copper SFP transceiver 102 further includes a first information storage chip; the first information storage chip is connected with the first golden finger and used for reading data in the first golden finger and storing the read information. The second copper SFP transceiver 103 further comprises a second information storage chip; the second information storage chip is connected with the second golden finger and used for reading data in the second golden finger and storing the read information.
As another embodiment, in order to integrate the gold finger 201, the buffer 202, the equalizer 203, and the information storage chip 204 together in the copper SFP transceiver, a PCB board is provided in the copper SFP transceiver.
The gold finger 201 is used for being inserted into the clamping groove, metal in the clamping groove is contacted with metal bonding pads arranged like fingers, the metal bonding pads can realize electrical connection between the two PCB boards, and each metal bonding pad is electrically connected with a metal layer of the PCB board according to signals defined by SFP standards.
The first copper SFP transceiver 102 and the second copper SFP transceiver 103 implement data transmission with the WR master switch 101 and the slave switch through gold fingers. The WR master switch 101 sends 1.25Gbaud differential signal data to a first buffer in the first copper SFP transceiver 102 through TD +/TD-signals on the first gold finger, the first buffer sends 1.25Gbaud differential signal data to one of a pair of twisted-pair wires of a PCB board connected to the first copper SFP transceiver 102, the differential data is transmitted through the twisted-pair wires, received by a second equalizer in the second copper SFP transceiver 103 of the network cable, and sent to the WR system slave switch through an RD +/RD-pin of the second gold finger. The process of WR slave switch 104 sending data to WR master switch 101 is identical to the process described above except that another pair of lines and another pair of buffer/equalizer combinations are used. This enables gigabit data exchange between WR master switch 101 and WR slave switch 104.
Copper SFP has utilized the LOS detection function of DS15EA101 equalizer, the external host computer can monitor LOS signal pin on the SFP golden finger directly to judge whether receives the signal, in addition, the information memory chip that SFP provided carries on the read and write data through I2C bus by WR main exchange 101 or slave exchange, the information memory chip can only read and write the data, can offer functions such as information authentication for copper SFP, thus accord with WR system requirement.
The invention provides an SFP transmission system based on a distributed synchronous time service technology, which does not introduce uncertain time quantum, so that the time synchronization of a WR master-slave machine is realized through the algorithm of the system after the WR system obtains the time stamp information of the WR exchange master-slave machine. The method can be applied to WR precise time synchronization and data transceiving systems.
To provide protection for the first copper SFP transceiver 102 and the second copper SFP transceiver 103, the first copper SFP transceiver 102 and the second copper SFP transceiver 103 each further comprise a metal package housing.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. An SFP transmission system based on distributed synchronous time service technology is characterized by comprising: a WR master switch, a first copper SFP transceiver, a second copper SFP transceiver, and a WR slave switch;
the first copper SFP transceiver comprises a first golden finger, a first buffer and a first equalizer;
the second copper SFP transceiver comprises a second gold finger, a second buffer and a second equalizer
The data output end of the WR main switch is connected with the data receiving end of the first golden finger; the output end of the first golden finger is connected with the input end of the first buffer, the output end of the first buffer is connected with the input end of the second equalizer, and the output end of the second equalizer is connected with the input end of the second golden finger; the data transmitting end of the second golden finger is connected with the data input end of the WR slave switch;
the data output end of the WR slave switch is connected with the data receiving end of the second golden finger; the output end of the second golden finger is connected with the input end of the second buffer; the output end of the second buffer is connected with the input end of the first equalizer, the output end of the first equalizer is connected with the input end of the first golden finger, and the data sending end of the first golden finger is connected with the data input end of the WR main switch.
2. The SFP transmission system based on the distributed synchronous time service technology as claimed in claim 1, wherein the first copper SFP transceiver is connected with the second copper SFP transceiver through CAT7 network cable.
3. The SFP transmission system based on the distributed synchronous time service technology as claimed in claim 2, wherein the output end of the first buffer is connected with the input end of the second equalizer through the first twisted pair of the CAT7 network wire;
the output of the second buffer is connected to the input of the first equalizer through a second twisted pair of the CAT7 mesh.
4. An SFP transmission system according to any of claims 1 to 3 characterised in that the type of said first buffer and the type of said second buffer are both DS15BA 101.
5. An SFP transmission system based on distributed synchronous time service technology according to any of the claims 1 to 3, characterized in that the model of the first equalizer and the model of the second equalizer are both DS15EA 101.
6. The SFP transmission system based on the distributed synchronous time service technology as recited in claim 1, wherein the first copper SFP transceiver further comprises a first information storage chip; the first information storage chip is connected with the first golden finger and used for reading data in the first golden finger and storing the read information;
the second copper SFP transceiver further comprises a second information storage chip; the second information storage chip is connected with the second golden finger and used for reading data in the second golden finger and storing the read information.
7. The SFP transmission system based on the distributed synchronous time service technology as recited in claim 1, wherein the first copper SFP transceiver and the second copper SFP transceiver each further comprise a metal package housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199194.1A CN110912611A (en) | 2019-11-29 | 2019-11-29 | SFP transmission system based on distributed synchronous time service technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199194.1A CN110912611A (en) | 2019-11-29 | 2019-11-29 | SFP transmission system based on distributed synchronous time service technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110912611A true CN110912611A (en) | 2020-03-24 |
Family
ID=69820518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911199194.1A Pending CN110912611A (en) | 2019-11-29 | 2019-11-29 | SFP transmission system based on distributed synchronous time service technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110912611A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187363A (en) * | 2020-09-18 | 2021-01-05 | 中国科学院上海光学精密机械研究所 | High-precision optical fiber time frequency transmission system and method compatible with Ethernet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347830A (en) * | 2011-11-09 | 2012-02-08 | 中兴通讯股份有限公司 | Synchronization method and system of Ethernet |
| CN103236915A (en) * | 2013-04-24 | 2013-08-07 | 深圳市极致兴通科技有限公司 | Synchronous Ethernet power port module |
| CN203166949U (en) * | 2013-04-24 | 2013-08-28 | 深圳市极致兴通科技有限公司 | Isochronous Ethernet electrical port module |
| CN203840362U (en) * | 2014-04-18 | 2014-09-17 | 武汉电信器件有限公司 | Synchronous Ethernet electrical interface module structure |
| CN204130834U (en) * | 2014-07-23 | 2015-01-28 | 中兴通讯股份有限公司 | Sfp module |
-
2019
- 2019-11-29 CN CN201911199194.1A patent/CN110912611A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347830A (en) * | 2011-11-09 | 2012-02-08 | 中兴通讯股份有限公司 | Synchronization method and system of Ethernet |
| CN103236915A (en) * | 2013-04-24 | 2013-08-07 | 深圳市极致兴通科技有限公司 | Synchronous Ethernet power port module |
| CN203166949U (en) * | 2013-04-24 | 2013-08-28 | 深圳市极致兴通科技有限公司 | Isochronous Ethernet electrical port module |
| CN203840362U (en) * | 2014-04-18 | 2014-09-17 | 武汉电信器件有限公司 | Synchronous Ethernet electrical interface module structure |
| CN204130834U (en) * | 2014-07-23 | 2015-01-28 | 中兴通讯股份有限公司 | Sfp module |
Non-Patent Citations (1)
| Title |
|---|
| TEXAS INSTRUMENTS INCORPORATED: "AN-1909 DS15BA101 and DS15EA101 Enable Long Reach Applications for Embedded Clock SER/DES", 《APPLICATION REPORT》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187363A (en) * | 2020-09-18 | 2021-01-05 | 中国科学院上海光学精密机械研究所 | High-precision optical fiber time frequency transmission system and method compatible with Ethernet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10374782B2 (en) | Full duplex transmission method for high speed backplane system | |
| US7734183B2 (en) | XFI-XAUI integrated circuit for use with 10GBASE-LX4 optical transceivers | |
| CN104022828B (en) | A kind of optical fiber data transmission method based on asynchronous communication model | |
| CN209489030U (en) | Master control cabinet and power electronic control system | |
| CN212518992U (en) | Optical fiber transmission device of 8K signal source | |
| US20230394006A1 (en) | Fpga-based usb 3.0/3.1 control system | |
| CN108462620B (en) | Gilbert-level SpaceWire bus system | |
| CN117200890A (en) | PCIE optical communication transmission system | |
| CN203643598U (en) | Radar data recording device | |
| CN103138866A (en) | Clock synchronization small form pluggable (SFP) electrical port device and synchronization systems | |
| CN201251783Y (en) | PCI-E-based fiber transmission card | |
| CN110912611A (en) | SFP transmission system based on distributed synchronous time service technology | |
| JP2020515114A (en) | High Density Small Form Factor Pluggable Modules, Housings and Systems | |
| US6880078B2 (en) | Xaui extender card | |
| CN219227609U (en) | JESD204B data transmission system based on optical fiber medium | |
| US12117955B2 (en) | Spread spectrum clock negotiation method, and peripheral component interconnect express device and system | |
| Sun et al. | Design of ethernet-VLC data conversion system based on FPGA | |
| CN109995442B (en) | Burst error code testing method and error code instrument for locomotive network communication system | |
| CN202103684U (en) | Digital circuit for realizing frame synchronization of STM-64 | |
| Nishimura et al. | Optical interconnection subsystem used in the RWC-1 massively parallel computer | |
| Liao et al. | An efficient and low-overhead chip-to-chip interconnect protocol design for NoC | |
| CN220087293U (en) | Ethernet optical fiber transmission rate negotiation self-adaptive circuit | |
| CN216116072U (en) | Absolute formula encoder collection system based on etherCAT interface | |
| LU502906B1 (en) | Method for testing burst bit error of locomotive network communication system and bit error ratio tester | |
| CN101835186A (en) | Detection method and detection device of misconnection of Yuanyang lines and base station subsystem |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200324 |