CN109889796A - A kind of 12G-SDI ultra high-definition video optical multiplexer - Google Patents
A kind of 12G-SDI ultra high-definition video optical multiplexer Download PDFInfo
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Abstract
The present invention relates to a kind of 12G-SDI ultra high-definition video optical multiplexers, comprising: 12G-SDI transmits transmitting terminal, and the 12G-SDI ultra high-definition digital video signal for inputting user is converted into optical signal by signal processing, and is transmitted by fiber medium；12G-SDI transmits receiving end, for the high speed serialization optical signal of reception optical fiber transmission, optical signal is reduced into 12G-SDI ultra high-definition digital video signal by signal processing, is exported to relevant device.The present invention is compatible with ST-2082/1, SMPTE 424M, 344M, 292M and 259M standard, it being capable of uncompressed transmission 4K/60fps ultra high-definition video, the advantages of transmission bandwidth is up to 11.88Gbps, while having transmission real-time good, long transmission distance, strong interference immunity.
Description
Technical field
The present invention relates to signal transmission and the communications fields, particularly relate to a kind of 12G-SDI ultra high-definition video light end
Machine.
Background technique
SDI interface is the acronym of digital component serial line interface (Serial Digital Interface), be by
SMPTE (Society of Motion Picture and Television Engineers) tissue, that is, film and television engineering
A kind of digital visual interface standard that Shi Xiehui is formulated.Since SDI interface uses uncompressed transmission of video mode, have
The advantages such as control real-time is high, picture quality is good, transmission delay is low and be widely used in the fields such as radio and television, video monitoring.
Simultaneously as sdi signal is most of using BNC coaxial cable, have the characteristics that low, strong interference immunity is lost, therefore passing
It is defeated apart from upper generally at hundred meters or more.
With the continuous development of film and television technology, the film and television of 4K (3840*2160) resolution ratio are gradually popularized.
HDMI interface towards consumption Terminal Type has HDMI2.0 version at present and is used for transmission 4K/60fps vision signal, such as in height
It is used in clear top box of digital machine, but the transmission range of HDMI interface is very limited, generally smaller than 10 meters.And towards film and television
SDI interface, such as the TV station towards broadcast level market, studio of industry etc. also gradually upgrade to 4K.SMPTE tissue in order to
SDI interface transmits 4K/60fps video, proposes SMPTE ST-2082 standard, i.e. 12G-SDI.Since 4K/60fps video needs
The vast capacity bandwidth of 12Gbps is wanted, existing optical transmitter and receiver can not accomplish the data of the so big bandwidth of real-time Transmission, if by video
Required bandwidth can be then substantially reduced by signal compression, but since video codec needs holding time so can not accomplish
The requirement of the real-time Transmission and encoding and decoding of signal also need to occupy a large amount of processor resource.Simultaneously in the ring of signal transmission
Section, being promoted for signal transmission rate can propose harsher requirement to existing equipment, especially in the process transmitted at a distance
In due to skin effect presence, high-frequency signal has serious decaying, and is easily disturbed, it is therefore desirable to a kind of more steady
Reliable scheme is determined to solve the requirement of high-speed, the high-resolution remote real-time Transmission of 4K/60fps vision signal.
Summary of the invention
In view of the analysis of above-mentioned SDI technology, the present invention is intended to provide a kind of 12G-SDI ultra high-definition video optical multiplexer, uses
LMH1219 chip and LMH1218 chip realize optical transmitter and receiver to solve existing equipment and can not transmit 4K/60fps vision signal, it is long away from
From the technical problem excessive, that distance is limited that decays, so that it is guaranteed that the real-time Transmission of 4K/60fps vision signal.
The purpose of the present invention is mainly achieved through the following technical solutions:
The present invention provides a kind of 12G-SDI ultra high-definition video optical multiplexers, comprising:
12G-SDI transmits transmitting terminal, the 4K/60fps ultra high-definition vision signal of the SDI interface standard for inputting user
By being converted into high-speed serial signals after processing, then optical signal is converted the electrical signal to, and pass through optical fiber transmission；
12G-SDI transmit receiving end, for reception optical fiber transmission high speed serialization optical signal, by after photoelectric conversion again
Electric signal is reverted to, then recovers 4K/60fps ultra high-definition vision signal after treatment, is exported to relevant device.
Further, the 12G-SDI transmission transmitting terminal specifically includes:
End cable adaptive equalizer is sent, for regarding to user by the SDI high-definition digital that 75 Ω coaxial cables input
Frequency signal carries out direct current recovery and signal shaping, and compensates the decaying of SDI high-definition digital video signal high frequency section, sends out after filtering
Give transmitting terminal retimer；
Transmitting terminal retimer, for detecting the data rate of the SDI high-definition digital video signal received, and according to not
It retimes with data rate to SDI high-definition digital video signal, weaken high dither and signal integrity is provided, so
After be sent to transmitting terminal Video SFP optical module；
Transmitting terminal Video SFP optical module, for will treated that data are converted into optical signal from electric signal and pass through light
Minute matter transmission；
Transmitting terminal configures MCU, for configuring cable adaptive equalizer and retimer, and reads optical fiber link state；
Transmitting terminal power supply, low noise needed for the single power supply for inputting transmitting terminal is converted into each module of transmitting terminal,
Low ripple, stable DC source.
Further, the transmission end cable adaptive equalizer is specifically used in thermal compensation signal transmission process due to the skin that becomes
More phenomenons that the radio-frequency component of signal caused by effect is decayed relative to low-frequency component.Balanced device has higher increasing in high frequency treatment
The high-frequency gain of balanced device is arranged to value appropriate, will form after transmission cable and balanced device series connection big in Whole frequency band by benefit
Cause flat frequency response.And adaptive equalizer can be obtained with automatic detection signal quality to which the equilibrium value of corresponding optimum be arranged
It is responded to optimal transmission channel frequency, is sent to transmitting terminal retimer after being finally completed the equilibrium to input sdi signal.
Further, the transmitting terminal retimer is specifically used for automatic detection input signal types, tell SD-SDI,
The processing requirement of HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI different rates adjusts itself PLL and ce circuit to restore
Go out the clock of low jitter with shaping, then the sdi signal for sending out and receiving of retiming, to reduce the shake of sdi signal.SDI
Transmission channel is very long or transmission process in deteriorated by other noises and interference, the only balanced device matter that also is not enough to improve signal
Amount, and retimer is to inhibit and reduce cumulative noise by PLL and CDR, therefore concatenate one again in equalizer output
A retimer is an ideal the scheme for improving sdi signal quality.Signal is exported to transmission after retimer is handled
Hold Video SFP optical module.
Further, the transmission end cable adaptive equalizer, retimer are realized using chip LMH1219.The core
Piece is integrated 2:1 multiplexing and 1:2 fan-out circuit, is inputted in the present invention using its two-way for INVENTIONBroadcast video router, interchanger etc.
In all the way with all the way, completed to the equilibrium of input sdi signal and when resetting in two-way output.
Further, the effect of the transmitting terminal configuration MCU is to configure cable adaptive equalizer by SPI communication bus
And retimer, it monitors the locking and out-of-lock state of transmitting terminal retimer in real time, and read optical fiber link state, obtains optical fiber
Whether signal the information such as loses.
Further, the transmitting terminal Video SFP optical module uses GHP-3112G-L2CD optical module, guarantees transmission figure
As the problems such as no stroboscopic, blank screen.
Further, 12G-SDI transmission receiving end specifically includes:
Receiving end Video SFP optical module, for receiving the optical signal transmitted by transmitting terminal optical fiber, after photoelectric conversion
Become differential electric signal and is sent to receiving end retimer；
Receiving end retimer, the SDI high-definition digital video letter of the different rates for receiving the transmission of receiving end optical module
Number and retime, weaken and high dither and provide signal integrity, be then sent to receiving end cable driver；
Receiving end cable driver, for believing the SDI video for being converted to standard by the signal of receiving end retimer
Number and exported by 75 Ω coaxial cables to relevant device；
Receiving end configures MCU and monitors the lock of ce circuit in real time for configuring receiving end retimer and cable driver
Determine state, and obtains optical fiber link state；
Receiving end power supply, low noise needed for the single power supply for inputting receiving end is converted into each module in receiving end,
Low ripple, stable DC source.
Further, the receiving end retimer is specifically used for according to required SDI data rate, including 270Mbps,
1.485Gbps, 2.97Gbps, 5.94Gbps, 11.88Gbps inhibit by PLL and CDR and reduce cumulative noise.
Further, the receiving end retimer, cable driver are realized using chip LMH1218.The chip is used for
Digital video router and interchanger etc. integrate 2:1 multiplexing and 1:2 fan-out circuit, are utilized in the input of its two-way in the present invention
All the way with two-way output in all the way, complete to transmission sdi signal reset when and driving.
Further, the receiving end Video SFP optical module uses GHP-3112G-L2CD optical module, guarantees transmission figure
As the problems such as no stroboscopic, blank screen.
Compared with prior art, the present invention has the beneficial effect that:
Optical transmitter and receiver is realized using LMH1219 chip and LMH1218 chip, thus realize transmission 4K/60fps vision signal,
Good, the advantages of transmission belt is roomy, long transmission distance, strong interference immunity with transmission real-time.
Other features and advantages of the present invention will illustrate in the following description.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of described device of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of LMH1219 chip circuit in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of LMH1218 chip circuit in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
As shown in FIG. 1, FIG. 1 is the structural schematic diagrams of described device of the embodiment of the present invention, can specifically include 12G-SDI biography
Defeated transmitting terminal and 12G-SDI transmit receiving end, wherein 12G-SDI transmission transmitting terminal includes: to send end cable adaptive equalizer
11, transmitting terminal retimer 12, transmitting terminal Video SFP optical module 13, transmitting terminal configuration MCU14 and transmitting terminal power supply 15；
It includes: receiving end Video SFP optical module 21, receiving end retimer 22, receiving end cable drive that 12G-SDI, which transmits receiving end,
Device 23, receiving end configuration MCU24 and receiving end power supply 25.
End cable adaptive equalizer 11 is sent, user requires resistance by the SDI high-definition video signal that coaxial cable inputs
The matching of anti-75 Ω, configures SDI positive input by resistor network first, completes the impedance matching of single-ended 75 Ω, and passes through
AC coupled mode inputs transmitting terminal cable equalization module 11.Due to skin effect, signal frequency is higher, and cable is to transmit letter
Number area of section it is just fewer, therefore high frequency region occur signal attenuation it is more serious than low frequency range.The response letter of signal decaying
Number curve is directly proportional to the square root of frequency, so if it is infeasible for providing compensation using the filter of standard model.
Therefore adaptive equalizer need to be used, sdi signal restores by equalization filter, direct current, automatic equalization controls (AEC), carrier wave inspection
Output is driven after the signal processings such as survey, the weak signal of input can be improved, become to compare clearly signal, be finally completed
To input sdi signal equilibrium after be sent to transmitting terminal retimer 12.
Transmitting terminal retimer 12, sdi signal is after completing input terminal equilibrium treatment, into transmitting terminal retimer 12,
Its internal PLL can be inputted according to the difference SDI after equilibrium and be extracted clock transition information, pass through internal PLL (phaselocked loop)
Will processing clock multiplier to 270MHz, 1.485GHz, 2.97GHz, 5.94GHz or 11.88GHz, be allowed to meet SD-SDI,
The processing requirement of HD-SDI, 3G-SDI, 6G-SDI and 12G-SDI different rates.Phase of the internal phase discriminator to input data
It is compared with processing clock, so that input data reaches consistent with the edge of processing clock, then passes through an internal synchronization
FIFO completes the synchronization caching of signal, and data that treated are exported to transmitting terminal Video SFP optical module 13.Difference after when resetting
Sub-signal output difference impedance is 100 Ω, uses AC coupled mode with the connection type of Video SFP optical module.
LMH1219 chip is used in the embodiment of the present invention, electrical block diagram is as shown in Fig. 2, the integrated chip
Send end cable adaptive equalizer 11 and transmitting terminal retimer 12.Input the capacitor AC coupled that sdi signal passes through 4.7uF
To the end IN0+ of chip, while the end IN0- equally passes through the capacitor AC coupled of a 4.7uF and connects the resistance of 75 Ω extremely
Ground, the sdi signal to input with bnc interface complete impedance matching.The remote adaptive cable equalizer design at the end IN0 is used
In the balanced data transmitted by 75 Ω coaxial cables, can be run under wider transmission rate, the speed range of support is
125Mbps to 11.88Gbps.Subsequently into retimer, high dither can be weakened and outstanding signal integrity is provided.Finally
Signal enters output driver, which provides programmable function of postemphasising, and the circuit board for compensator output end is walked
Line loss is lost, and final output differential impedance is the differential signal OUT0+ and OUT0- of 100 Ω.
Transmitting terminal Video SFP optical module 13, will treated that electric signal is converted into optical signal is sent to light from LMH1219
It is fine.GHP-3112G-L2CD optical module is used in the embodiment of the present invention, effective propagation path reaches 20km, the Video SFP light
Module has lower EMI, inputs as Differential Input, is able to detect signal using AC coupled mode, while there are also LOS pin
Whether lose.
Transmitting terminal configures MCU14, configures LMH1219 by communication interface and monitors optical fiber link state.It controls first
MODE_SEL pin determines that the communication interface of LMH1219 is SPI or SMBus, and concrete configuration is shown in Table 1.Then pass through IN_
OUT_SEL pin selects input port to the signal stream of output port, and concrete configuration is shown in Table 2.Then pass through OUT_CTRL
Pin selects from the selected port IN to OUT0 ±, OUT1 ± signal stream, concrete configuration is shown in Table 3.Then pass through VOD_DE
Pin selection OUT0 ±, OUT1 ± driver output amplitude and postemphasis level, concrete configuration is shown in Table 4.LOCK_ simultaneously
N pin is input clock lock indicator, needs external 2K Ω to 5K Ω to be pulled to logic power, LOCK_N is drawn when locked
It is low.
1 MODE_SEL pin configuration table of table
| Level | Definition |
| H | Battery saving mode is forced, only enables SPI (every other down circuitry) |
| F | SPI interface is selected to carry out register access |
| R | Being preserved for factory testing-please don't use |
| L | SMBus interface is selected to carry out register access |
2 IN_OUT_SEL pin configuration table of table
| Level | Definition |
| H | SMPTE data rate: IN0 to OUT0 and OUT1 |
| F | SMPTE data rate: IN0 to OUT0 (disabling OUT1) |
| R | 10GbE data rate: IN1 to OUT1 (OUT0 disabling) |
| L | 10GbE data rate: IN1 to OUT0 and OUT1 |
3 OUT_CTRL pin configuration table of table
4 VOD_DE pin configuration table of table
Transmitting terminal configuration MCU can also read the connection status of optical fiber link, and when optical fiber link exception prompts user.Specifically
For be exactly, transmitting terminal configuration MCU can read Video SFP optical module optical fiber link connection status instruction foot LOS, LOS pipe
Foot is that high level shows that optical fiber links are abnormal, are that low level shows that optical fiber links are normal, in remote SDI optical signal transmission process
Whether the optical fiber link connection of middle Real-time Feedback whole system is normal.
Transmitting terminal power supply 15, the DC power supply to provide low noise low ripple are powered to sdi signal link.SMPTE rule
The representative value of model output voltage amplitude is 800mV, and 3G-SDI can be at most attenuated after 200 meters of cable transmission
50dB, and the power supply noise of low frequency and ripple after too long cable almost without decaying, it means that sdi signal amplitude exists
Can be down to several mV after cable transmission, this is very close with ripple with power supply noise, and power supply will deteriorate significantly at this time
The signal-to-noise ratio of SDI.Therefore, select LDO (Low Dropout Regulator) linear voltage regulator as power supply in present example
Power supply chip, rather than DC/DC switching power source chip is used, specific choice chip is LP3878, and the chip is using by 10nF
Its output noise can be down to 18uV after the capacitor of road.
The 12G-SDI transmission each component part of transmitting terminal is illustrated above, next again to 12G-SDI
Each component part of transmission receiving end is illustrated.
Receiving end Video SFP optical module 21, the optical signal transmitted for receiving transmitting terminal optical fiber, and it is converted into electricity
Signal is exported later with difference form.GHP-3112G-L2CD optical module is used in the embodiment of the present invention, effective propagation path reaches
To 20km, while the LOS pin of the Video SFP optical module can show whether signal is lost, and judge optical fiber link whereby
Operating status.
Receiving end retimer 22, by its internal PLL will handle clock multiplier to 270MHz, 1.485GHz,
2.97GHz, 5.94GHz or 11.88GHz, internal phase discriminator are compared the phase of input data with processing clock, mesh
The edge for making input data and handling clock reach consistent, then by the synchronization of internal synchronization FIFO completion signal
Caching, data that treated are exported to receiving end cable driver 23.
Receiving end cable driver 23,75 Ω for the differential signal for passing through retimer to be changed into standard export resistance
Anti- SDI vision signal is simultaneously exported via bnc interface.
LMH1218 chip is used in present example, electrical block diagram is as shown in figure 3, the integrated chip connects
Receiving end retimer 22 and receiving end cable driver 23.4.7uF is passed through by the differential signal that Video SFP optical module 21 exports
Coupled capacitor AC coupled to the end IN0 of LMH1218, subsequently into the retimer part of its inside.Last signal passes through
It exports after its output driver to the end OUT0, wherein the end OUT0+ is exported by 4.7uF capacitor AC coupled to bnc interface,
The end OUT0- is followed by 75 Ω resistance to ground to complete impedance matching by 4.7uF capacitive coupling.
Receiving end configures MCU24, configures LMH1218 by communication interface and monitors optical fiber link state.It controls first
MODE_SEL pin level is to select the communication interface of LMH1218 chip, and pull-up 1K Ω to VDD is SPI interface, and drop-down 1K Ω is extremely
Ground is SMBus interface.Then control control ENABLE pin control chip is enabled, and when pulling up 1K Ω to VDD, powering down chips are straight
To detecting useful signal；When pin floating, powering down chips are until detecting useful signal；When pin pulls down 20K Ω extremely
Chip is reserved state；When pin pulls down 1K Ω extremely, powering down chips include signal detector, and register is in reset state.
There are also LOCK pins to show ce circuit lock state simultaneously, when the pin sets high, ce circuit locking, and when setting low, CDR electricity
Road losing lock.Configuration MCU in receiving end can also show whether signal is lost by the LOS pin of Video SFP optical module.
Receiving end power supply 25, the same LDO chip LP3878 that uses low noise, it is ensured that supply similar with transmitting terminal power supply 15
Power supply accomplishes low noise low ripple, improves the signal-to-noise ratio of SDI transmission link.
By above embodiments realize 12G-SDI HD video optical transmitter and receiver compared with the prior art, the present invention have such as
It is lower the utility model has the advantages that
1. the present invention uses SDI input adaptive equalizing circuit, the retimer, output driver of high bandwidth, compatible ST-
2082/1, SMPTE 424M, 344M, 292M and 259M standard, can lossless real-time Transmission 4K/60fps resolution video, and
And can be backward compatible, transmission bandwidth is up to 11.88Gbps.
2. the high-speed transitions that the present invention realizes photosignal by Video SFP optical module in physical layer, it is ensured that transmission
The good feature of real-time, at the same have structure simple, cost economy, being capable of the advantages such as Distant Deployment.
3. the present invention uses the BNC video interface of standard, compatible with existing equipment, it can be convenient efficiently upgrading tradition and set
It is standby.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of 12G-SDI ultra high-definition video optical multiplexer, which is characterized in that transmit transmitting terminal including 12G-SDI and 12G-SDI is passed
Defeated receiving end, wherein
12G-SDI transmits transmitting terminal, and the 4K/60fps ultra high-definition vision signal of the SDI interface standard for inputting user passes through
It is converted into high-speed serial signals after processing, then converts the electrical signal to optical signal, and is transmitted by optical fiber；
12G-SDI transmits receiving end, for the high speed serialization optical signal of reception optical fiber transmission, by restoring again after photoelectric conversion
At electric signal, 4K/60fps ultra high-definition vision signal is then recovered after treatment, is exported to relevant device；
12G-SDI transmission transmitting terminal, which includes at least, cable adaptive equalizer 11, retimer 12, Video SFP optical module
13, it configures MCU14 and power supply 15, the cable adaptive equalizer 11 is connected with retimer 12, the retimer 12
It is connected with Video SFP optical module 13, the Video SFP optical module 13 is connected with optical fiber transmission end, the configuration
MCU14 is connected with cable adaptive equalizer 11, retimer 12 and Video SFP optical module 13, the power supply 15 and electricity
Cable adaptive equalizer 11, retimer 12, Video SFP optical module 13 are connected with configuration MCU14；
12G-SDI transmission receiving end, which includes at least, Video SFP optical module 21, retimer 22, cable driver 23, configuration
MCU24 and power supply 25, the Video SFP optical module 21 connect retimer 22, the retimer after connecting external fiber
22 connecting cable drivers 23, the configuration MCU24 connection Video SFP optical module 21, retimer 22 and cable driver
23, the power supply 25 connects Video SFP optical module 21, retimer 22, cable driver 23 and configuration MCU24；
The cable adaptive equalizer 11 and retimer 12 are using the realization of LMH1219 chip, the Video SFP optical module
13 are realized using GHP-3112G-L2CD optical module, and the power supply 15 is realized using LP3878 chip；
The Video SFP optical module 21 is using the realization of GHP-3112G-L2CD optical module, the retimer 22, cable drive
Device 23 realizes that the power supply 25 is realized using LP3878 chip using LMH1218 chip.
2. 12G-SDI ultra high-definition video optical multiplexer according to claim 1, which is characterized in that the 12G-SDI transmission hair
Sending end input is the SDI vision signal of 75 Ω impedance of bnc interface and enters cable adaptive equalizer 11.
3. 12G-SDI ultra high-definition video optical multiplexer according to claim 2, which is characterized in that the adaptive equalizer
Sdi signal rate is inputted for automatic identification and completes the compensation to sdi signal high frequency section, and sdi signal rate is
270Mbps, 1.485Gbps, 2.97Gbps, 5.94Gbps or 11.88Gbps.
4. 12G-SDI ultra high-definition video optical multiplexer according to claim 3, which is characterized in that the retimer 12 is used
It is retimed in the SDI high-definition digital video signal to different data rate to weaken high dither and to provide signal complete
Whole property.
5. 12G-SDI ultra high-definition video optical multiplexer according to claim 4, which is characterized in that the Video SFP optical mode
Block 13 is used to complete by optical module to transmit after the conversion from electric signal to optical signal by fiber medium.
6. 12G-SDI ultra high-definition video optical multiplexer according to claim 2, which is characterized in that the configuration MCU14 is used for
Cable adaptive equalizer 11 and retimer 12 are configured, and reads the state of Video SFP optical module 13, obtains optical fiber chain
Road information.
7. 12G-SDI ultra high-definition video optical multiplexer according to claim 1, which is characterized in that the 12G-SDI transmission connects
Receiving end input is optical signal, completes to become differential signal transmission after the photoelectric conversion of signal by Video SFP optical module 21
To retimer 22.
8. 12G-SDI ultra high-definition video optical multiplexer according to claim 7, which is characterized in that the retimer 22 is used
SD-SDI, HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI high-definition digital video of the different rates of optical module transmission are connect in identification
Signal is simultaneously retimed to weaken high dither and provide signal integrity.
9. 12G-SDI ultra high-definition video optical multiplexer according to claim 8, which is characterized in that the cable driver 23
For converting a signal into the SDI vision signal of standard and being exported by 75 Ω coaxial cables to relevant device.
10. 12G-SDI ultra high-definition video optical multiplexer according to claim 7, which is characterized in that the configuration MCU24 is used
In the state for reading Video SFP optical module 21, optical fiber link information is obtained, and configures retimer 22 and cable driver
23。
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Application publication date: 20190614 |