CN102684945A - Test access port (TAP) equipment - Google Patents
Test access port (TAP) equipment Download PDFInfo
- Publication number
- CN102684945A CN102684945A CN2012101425207A CN201210142520A CN102684945A CN 102684945 A CN102684945 A CN 102684945A CN 2012101425207 A CN2012101425207 A CN 2012101425207A CN 201210142520 A CN201210142520 A CN 201210142520A CN 102684945 A CN102684945 A CN 102684945A
- Authority
- CN
- China
- Prior art keywords
- road
- tap
- balanced
- transmitter
- transmission line
- 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
Abstract
The invention discloses test access port (TAP) equipment. High-speed data is distributed to a plurality of monitoring ports by using an electric replication method, and signal quality is kept unchanged. An original signal is recovered from attenuation on a transmission path by an input end equalization circuit, an output end pre-emphasis circuit and a clock recovery circuit, and a transmission delay is ensured to be lowest.
Description
Technical field
The invention belongs to networking technology area, special, belong to a kind of TAP equipment.
Background technology
In extensive high-performance search and high-performance data excavation etc. are used; Separate unit work station/server can't satisfy calculation requirement usually; This need distribute to hundreds and thousands of work stations with the external network data sent and calculate respectively, forms system as shown in Figure 1.TAP101 receives the external network data sent, and a circuit-switched data is copied as 8 TAP102 that 8 tunnel outputs are distributed to down one deck.8 TAP102 of the second layer copy as 64 the tunnel and be distributed to 64 TAP103 of the 3rd layer with 8 circuit-switched data again, and 64 TAP103 of the 3rd layer are distributed to 256 work stations/server set with data at last.Support the work station/server of greater number if desired, then need use TAP or adopt more multilayer TAP cascade with more output ports.
In application such as the search of aforementioned high-performance and high-performance data excavation in order to obtain higher communication bandwidth and performance; Adopt 10G optical access network OAN (Optical Access Network) at a high speed to become main flow, therefore need a large amount of TAP that support the 10G optical module that use.
The optical-fiber network TAP of modern commerceization mainly adopts two kinds of technology: a kind ofly be to use traditional fiber amplifier OFA (Optical
Fiber Amplifier) adds optical splitter output type TAP; Another kind is the system mode of replying by cable, is about to light signal and converts to after the signal of telecommunication, promptly exports to optical module after distributing through data distributor again.
Use 8 tunnel output TAP of image intensifer (OFA) and optical splitter as shown in Figure 2, mainly connect to export to be connected and form with coupling unit 207 and power supply and monitor portion 208 with coupling unit 201, wavelength selective coupler (WSC) 202, laser pumping source 203, optical isolator 204, erbium-doped fiber amplifier EDOFA (Erbium-doped Optical Fiber Amplifier) 205, optical splitter 206, light by light-receiving.
Such TAP exists following problem:
1, business-like fiber amplifier 205 only has erbium-doped fiber amplifier a kind of; It can only amplify near the light signal the 1550nm wavelength, does not have amplifying power for short distance transmission employed 1310nm of low cost S FP optical module and 850nm wavelength signals commonly used.The optical module that works in the 1550nm wavelength is more expensive than the optical module that works in 1310nm and 850nm wavelength, and volume can't accomplish the SFP size more greatly, and this will significantly increase system cost and reduce power system capacity.
2, fiber amplifier can be introduced extra chromatic dispersion in amplification process; Comprise GVD (Group VelocityDispersion, GVD) etc., this can make the pulse duration of light signal increase; The result of performance reduces signal quality, may produce error code when serious.
3, fiber amplifier can be introduced extra time of delay.The propagation velocity of light in monomode fiber SMF (Single-mode opticalfiber) is about 2/3 of vacuum light speed, i.e. the time of one meter 5 nanosecond of needs of every propagation (ns) in monomode fiber; The propagation velocity of light in multimode fiber MMF (Multi-mode optical fiber) is slower.
In the application to the delay extreme sensitivity such as high-performance data excavation, the TAP of this use image intensifer (OFA) can reduce systematic function greatly.
The TAP of use system of replying by cable or electric regeneration is as shown in Figure 3; Mainly by forming with the lower part: pluggable one or more emission and reception module 301 receiving optical signals also are converted into signal of telecommunication output; High-speed serial data normally; This high-speed serial data is coupled to 302 through differential pair S1; 302 is the data fan out buffer (Fanout Buffer) or the multiplexer (Multiplexer) of one or more levels difference, be responsible for converting the input of one road high-speed serial data output of into multipath high-speed serial data, and use differential pair S2 is coupled to emission and reception module 301, use differential pair S3 is coupled to and sends optical module 303.Emission and reception module 301 is responsible for converting the high-speed serial datas of electricity at a high speed light signal output with transmission optical module 303.Power supply and monitor portion 304 be for complete machine provides power supply, and can keep watch on the complete machine working condition.
The TAP of system of replying by cable or electric regeneration can support wavelength optical signals simultaneously through changing optical module; Stopped to use the existing problem of only supporting the 1550nm wave band of TAP of image intensifer and optical splitter, and can use SFP or SFP+ optical module to realize high-density installation.But the common system of replying by cable or the TAP of electric regeneration exist following problem:
1, with respect to the light signal that in optical fiber, transmits; The high-speed serial data of electrical signal form is interfered in the process of duplicating and transmitting more easily; This can bring extra time jitter (jitter) etc. to high-speed serial data, reduces the time accuracy of serial data.
Because time jitter is the time noise of signal in essence, according to the noise superposition theory, time jitter also can superpose.In the TAP of system of replying by cable or electric regeneration, the shake of the high-speed serial data of electrical signal form on its transmission path will superpose step by step, till converting light signal into.
Observe eye pattern (eye pattern) and be one of method of the assessment high-speed serial data signal quality of using always.With oscilloscope or ophthalmograp sampling high-speed serial data, when the sweep time and the baud rate of high-speed serial data of oscilloscope or ophthalmograp were synchronous, high-speed serial data seemed to understand the eyes as the people, i.e. eye pattern on the display of oscilloscope or ophthalmograp.Shown in Figure 5 is one the tunnel not have the eye pattern sketch map of high-speed serial data of shake; Hexagon in the middle of the figure is referred to as " template ", has only the lines (sampled point by high-speed serial data is formed) when the composition eye pattern just can not produce error code when promptly " informer " all drops on the template outside.The a road additional eye pattern that the high-speed serial data of significantly shaking is arranged for actual measurement shown in Figure 6, the informer of eye pattern is very fuzzy, has a large amount of sampling optimizations inner in template, and such high-speed serial data will have the very high error rate.
In case high-speed differential signal reaches at the jitter amplitude of front end ± 0.2UI (Unit Interval), the correct identification signal code element of receiving terminal then, thus produce error code; And shake greatly more, the error rate is high more.
Business-like system of replying by cable or electric regeneration TAP can't eliminate shake usually on the market.When system only comprises one-level TAP, use this system of replying by cable or the problem of electric regenerative TAP that can't eliminate shake little usually; But need cascade TAP so that in the application of massive duplication high-speed data signal shown in Figure 1, thisly can't not be competent at the system of replying by cable or the TAP of electric regeneration of jitter elimination function.
2, with respect to every kilometer decay less than 1dB of optical fiber, the signal of telecommunication receives the influence of dielectric loss and interference signal more easily in the process of duplicating and transmitting.
Fig. 7 is the mode of the signal of telecommunication.Arrive receiver 703 from the signal of transmitter 701 outputs through transmission line 702, being transmitted signal can induced noise voltage 704 on transmission line 702.The signal of 701 outputs is with x (t) expression, and 702 transfer function is h (t), and noise voltage 704 usefulness n (t) represent, then arrive signal y (t)=x (t) * h (the t)+n (t) of receiver 703.Wherein h (t) is by the common decisions such as dielectric loss characteristic of the length of transmission line and shape, transmission line sheet material of living in, and n (t) is relevant with transmission line operational environment of living in.
Attenuation characteristic for the microstrip line of on the multiple sheet material of 0.0762mm (closing 30 Mills made in Great Britain) thickness, surveying shown in Figure 8, the distance that this characteristic shows transmission line is longer then decay big more.More noticeablely among Fig. 8 be: dielectric loss can increase along with the rising of signal frequency, i.e. the transfer function h (t) and the frequency dependence of transmission line.Long transmission range can be brought great decay, especially at the high band of signal.This can make x (t) * h (t) component among the 703 signal y (t) that receive significantly reduce, and 704 noise voltage n (t) proportions will strengthen, and cause the signal to noise ratio of signal y (t) to reduce, and can bring error code when serious.Observe from eye pattern; This and loss frequency dependence will cause the rising and falling edges of high speed signal to slow down slowly; And different sign indicating number types (such as 0011 and 000111) are because its equivalent frequency is different; With having different pad values, the rising when changing between the promptly different sign indicating number types also can be different with decline, and this is referred to as intersymbol interference ISI (Inter Symbol Interference).Fig. 9 is that one road 10GE signal is through the eye pattern after the long FR4 transmission-line attenuation of 45cm, because signal, is beyond recognition so the informer of this eye pattern is in a mess with the pad value difference and the intersymbol interference of frequency change basically.
3, transmitting-receiving port layout is unreasonable, cause part reproduction path decay excessive, postpone long.Shown in Figure 10 is common in the market a kind of electric regeneration TAP, and its input port 1001 and 1002 is positioned at the right of cabinet, and four- way output port 1003,1004,1005,1006 is positioned at the left side of cabinet.In this topological structure; Input port 1001 or 1002 data almost will be passed through the distance above cabinet one half width through the path that arrives the output port of 1003 parts after the data reproducer 1007; Width according to each SFP optical module 14.25mm calculates; The nearest input port 1001 of the leftmost output port of 1003 parts is at least 16*14.25mm=228mm, and the signal of telecommunication is propagated on PCB and prolonged 228mm and approximately need 1ns.
Summary of the invention
In order to solve above-mentioned variety of issue; The present invention proposes a kind of system TAP that replies by cable; Comprise equalizer and clock data restorer, the M road of M road transceiver, M road band enlarging function balanced with pre-emphasis driver, N1 road transmitter, the N1 road is balanced with pre-emphasis driver, N2 road transmitter, the N2 road is balanced and pre-emphasis driver, M: (N1+N2+M) circuit-switched data switch, supervision and control unit, power supply and plurality of transmission lines is characterized by:
Said M road transceiver is positioned at the middle part of case front panel, the both sides that N1 road transmitter and N2 road transmitter lay respectively at, and the quantity of N1 and N2 is about equally.
The system TAP that replies by cable of the present invention, the equalizer of M road band enlarging function and the characteristics of clock data restorer are equalizer, clock data restorer and the preemphasis differential driver that comprises variable gain amplifier VGA, FFE or DFE type, it is characterized by,
The characteristics of the equalizer of said M road band enlarging function and the installation site of clock data restorer are near M road receiver, can guarantee that the distance of the transmission line between the two is the shortest
The system TAP that replies by cable of the present invention, wherein said M: (N1+N2+M) the circuit-switched data switch is responsible for forwarding of data and route control, and its output channel number is N1+N2+M, and the input channel number is M.The digital signal that the equalizer of band enlarging function and clock data restorer recover out from the M road is sent into M through transmission line: (N1+N2+M) circuit-switched data switch, distinguish again:
Duplicate to the M road is balanced through transmission line and to be sent to the M road transmitter in the transceiver of M road with pre-emphasis driver;
Duplicate to the N1 road is balanced through transmission line and to be sent to N1 road transmitter with pre-emphasis driver;
Duplicate to the N2 road is balanced through transmission line and to be sent to N2 road transmitter with pre-emphasis driver.
The system TAP that replies by cable of the present invention wherein keeps watch on control unit and has an Ethernet interface, and in have the webserver (Web Server), this webserver includes and shows the webpage that the TAP operating state is set.The user can use these webpages of browser access so that keep watch on the operating state of TAP, also can revise the mode of operation of TAP through webpage, and M is set: (N1+N2+M) replication topology of circuit-switched data switch, or close untapped output port to cut down the consumption of energy.
Description of drawings
What Fig. 1 showed is existing TAP equipment and network-building method
What Fig. 2 showed is the multichannel output TAP structure of using image intensifer and optical splitter in the prior art
What Fig. 3 showed is the TAP structure of system of replying by cable in the prior art or electric regeneration
What Fig. 4 showed is the shake sketch map of high-speed data
What Fig. 5 showed is the eye pattern and the template of 10Gbps data
What Fig. 6 showed is the eye diagram results of oscilloscope test
The channel model of the transmission line that Fig. 7 shows
What Fig. 8 showed is the attenuation data of pcb board material
What Fig. 9 showed is the data waveform that the 10Gbps signal is received through long Distance Transmission receiving terminal
What Figure 10 showed is the structural design of TAP in the prior art
What Figure 11 showed is the hardware block diagram design of TAP among the present invention
What Figure 12 showed is the receiving terminal circuit schematic diagram
What Figure 13 showed is the structure of multichannel equilibrium and pre-emphasis driver.
Embodiment
Below with reference to Figure 11 execution mode of the present invention is specifically described.
The system TAP that replies by cable of the present invention comprises M road transceiver 1101; The equalizer of M road band enlarging function and clock data restorer 1102; Balanced and the pre-emphasis driver 1103 in M road; N1 road transmitter 1104; Balanced and the pre-emphasis driver 1105 in N1 road; N2 road transmitter 1106; Balanced and the pre-emphasis driver 1107 in N2 road; M: (N1+N2+M) the circuit-switched data distributor 1108; Keep watch on and control unit 1109; Power supply 1110 and transmission line S1101; S1102; S1103; S1104; S1105; S1106; S1107; S1108 forms.Wherein 1111 is case front panel.
In order to reduce bulk delay; Transceiver channel layout of replying system TAP by cable according to the invention has following characteristic: M road transceiver 1101 is positioned at the middle part of case front panel 1111; N1 road transmitter and N2 road transmitter lay respectively at 1101 both sides, and the quantity of N1 and N2 about equally.This layout can avoid transmission line almost to need the situation of cross-domain whole cabinet; Under the situation of M=2, can guarantee half the less than case front panel 1111 width of air line distance between all output channels and the input channel.
The characteristics of M road transceiver 1101 are can be the transmitting-receiving port of optical module or electricity, include: M road receiver 1101a can receive light or electric input signal; M road transmitter 1101b can send light or electric output signal.
The equalizer of M road band enlarging function and the characteristics of clock data restorer 1102 are equalizer 1202, clock data restorer 1203 and the preemphasis differential driver 1204 that comprises variable gain amplifier VGA (Variable Gain Amplifier) 1201, CTLE (ContinuousTime Linear Equalization), FFE (Feed Forward Equalization) or DFE (Decision Feedback Equalization) type, and are shown in figure 12.The characteristics of 1102 installation site are near M road receiver 1101a, and this distance that can guarantee the transmission line S1101 between the two is the shortest.According to described transmission line model of Fig. 8 and dielectric loss characteristic shown in Figure 7; The shortest transmission line has optimum transfer function; And the shortest transmission line makes the possibility of its induced noise voltage reduce greatly, reaches 1102 signal near the primary signal of 1101a output thereby make.
Send into clock data restorer 1203 through the signal after 1202 equilibriums and extract bit clock, and use this clock when resetting, therefrom recover the differential driver 1204 that correct binary digital signal is sent into band preemphasis (pre-emphasis).Thereby 1204 preemphasis function can promote on the high fdrequency component compensation transmission line of output signal the loss with frequency dependence in advance according to the pcb board material in the decay of high band.Through using the equalizer and the clock data restorer 1102 of band enlarging function; Can be with reaching M: (Ni+N2+M) shake of the high-speed serial data before the circuit-switched data distributor 1108 drops to minimum; Thereby prevent to shake accumulation with intersymbol interference; This can improve the reliability of communication greatly, satisfies the demand of cascade.
The equalizer of band enlarging function and clock data restorer 1102 can also get into receiver 1101a decay before by compensating signal, and eliminate its shake.This function comprises but is not limited to channel and the copper cable that single mode or multimode fiber and optical module are formed.M: (N1+N2+M) circuit-switched data switch 1108 is responsible for forwarding of data and route control, and its output channel number is N1+N2+M, and the input channel number is M.Send into M from the digital signal that the equalizer and clock data restorer 1102 recoveries of M road band enlarging function are come out through transmission line S1103: (Ni+N2+M) the circuit-switched data switch 1108, distinguish again: 1, duplicate to the M road is balanced through transmission line S1104 and be sent to the M road transmitter 1101b in the M road transceiver 1101 with pre-emphasis driver 1103; 2, duplicate to the N1 road is balanced through transmission line S1105 and be sent to N1 road transmitter 1104 with pre-emphasis driver 1105; 3, duplicate to the N2 road is balanced through transmission line S1107 and be sent to N2 road transmitter 1106 with pre-emphasis driver 1107.
The balanced structure with pre-emphasis driver 1103,1105 and 1107 of multichannel is shown in figure 13, comprises equalizer 1301, clock data restorer 1302 and the preemphasis differential driver 1303 of CTLE (ContinuousTime Linear Equalization), FFE (Feed Forward Equalization) or DFE (Decision FeedbackEqualization) type.Equalizer 1301 can compensate the decay of transmission line S1104, S1105 and S1107 respectively; When clock data restorer 1302 can reset the high-speed-differential data, eliminate shake; Preemphasis differential driver 1303 can compensate the decay of S1102, S1106 and S1108; Cooperate 1103,1105 and 1107 installation site respectively near its corresponding transmitter 1101b, 1104 and 1106 characteristic; Can make the distance of transmission line S1102, S1106 and S1108 the shortest; Thereby reduce the loss on these road strength to greatest extent, make reach transmitter 1101b, 1104 and 1106 signal quality is best, reduces error code.
M: (N1+N2+M) circuit-switched data switch 1108 can be realized multiple replication topology according to the configuration of keeping watch on control unit 1109: a certain road signal that 1, M road receiver 1101a is received duplicates to equilibrium of M road and pre-emphasis driver 1103 simultaneously, the equilibrium of N1 road is with pre-emphasis driver 1105 and the N2 road is balanced and pre-emphasis driver 1107, exports afterwards again; 2, a few roads signal that M road receiver 1101a is received duplicates balanced and pre-emphasis driver 1103 and/or the equilibrium of N1 road and pre-emphasis driver 1105 and/or equilibrium of N2 road and pre-emphasis driver 1107 to the M road respectively, exports afterwards again; 3, in aforementioned two kinds of replication topologies, can the untapped output channel of closed portion, to reduce Overall Power Consumption.
Keep watch on control unit 1109 and have an Ethernet interface, and in have the webserver (Web Server), this webserver includes and shows the webpage that the TAP operating state is set.The user can use these webpages of browser access so that keep watch on the operating state of TAP, also can revise the mode of operation of TAP through webpage, and M is set: (N1+N2+M) replication topology of circuit-switched data switch 1108, or close untapped output port to cut down the consumption of energy.
More than combine accompanying drawing that the preferred embodiment for the present invention is described in detail; But the invention is not restricted to above-mentioned execution mode; In the ken that those of ordinary skills possessed, can also under the prerequisite that does not break away from spirit of the present invention, make various variations.
Claims (4)
1. reply system TAP by cable for one kind; Comprise equalizer and clock data restorer, the M road of M road transceiver, M road band enlarging function balanced with pre-emphasis driver, N1 road transmitter, the N1 road is balanced with pre-emphasis driver, N2 road transmitter, the N2 road is balanced and pre-emphasis driver, M: (N1+N2+M) circuit-switched data switch, supervision and control unit, power supply and plurality of transmission lines is characterized by:
Said M road transceiver is positioned at the middle part of case front panel, the both sides that N1 road transmitter and N2 road transmitter lay respectively at, and the quantity of N1 and N2 is about equally.
2. the system TAP that replies by cable as claimed in claim 1; The equalizer of M road band enlarging function and the characteristics of clock data restorer are equalizer, clock data restorer and the preemphasis differential driver that comprises variable gain amplifier VGA, FFE or DFE type; It is characterized by
The characteristics of the equalizer of said M road band enlarging function and the installation site of clock data restorer are near M road receiver, can guarantee that the distance of the transmission line between the two is the shortest
3. the system TAP that replies by cable as claimed in claim 1, wherein said M: (N1+N2+M) the circuit-switched data switch is responsible for forwarding of data and route control, and its output channel number is N1+N2+M, and the input channel number is M.The digital signal that the equalizer of band enlarging function and clock data restorer recover out from the M road is sent into M through transmission line: (N1+N2+M) circuit-switched data switch, distinguish again:
Duplicate to the M road is balanced through transmission line and to be sent to the M road transmitter in the transceiver of M road with pre-emphasis driver;
Duplicate to the N1 road is balanced through transmission line and to be sent to N1 road transmitter with pre-emphasis driver;
Duplicate to the N2 road is balanced through transmission line and to be sent to N2 road transmitter with pre-emphasis driver.
4. the system TAP that replies by cable as claimed in claim 1 wherein keeps watch on control unit and has an Ethernet interface, and in have the webserver (Web Server), this webserver includes and shows the webpage that the TAP operating state is set.The user can use these webpages of browser access so that keep watch on the operating state of TAP, also can revise the mode of operation of TAP through webpage, and M is set: (N1+N2+M) replication topology of circuit-switched data switch, or close untapped output port to cut down the consumption of energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101425207A CN102684945A (en) | 2012-05-10 | 2012-05-10 | Test access port (TAP) equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101425207A CN102684945A (en) | 2012-05-10 | 2012-05-10 | Test access port (TAP) equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102684945A true CN102684945A (en) | 2012-09-19 |
Family
ID=46816338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101425207A Pending CN102684945A (en) | 2012-05-10 | 2012-05-10 | Test access port (TAP) equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102684945A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297590A (en) * | 2014-09-30 | 2015-01-21 | 东南大学 | Parallel test device based on electric signals |
| CN104316784A (en) * | 2014-09-30 | 2015-01-28 | 东南大学 | Parallel testing apparatus based on photoelectric mixed signals |
| CN109076032A (en) * | 2016-02-23 | 2018-12-21 | 华为技术有限公司 | Calibration phase offset and the FFE auxiliary CDR for improving Baudrate sampling phase-sensitive detector gain |
| CN109246037A (en) * | 2018-08-13 | 2019-01-18 | 上海奥令科电子科技有限公司 | Driver and HSSI High-Speed Serial Interface transmitter for high-speed serial data transmission |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7206337B2 (en) * | 2002-07-22 | 2007-04-17 | Broadcom Corporation | Bit stream conditioning circuit having output pre-emphasis |
| US20080310569A1 (en) * | 2007-06-01 | 2008-12-18 | Nec Electronics Corporation | Input/output circuit |
-
2012
- 2012-05-10 CN CN2012101425207A patent/CN102684945A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7206337B2 (en) * | 2002-07-22 | 2007-04-17 | Broadcom Corporation | Bit stream conditioning circuit having output pre-emphasis |
| US20080310569A1 (en) * | 2007-06-01 | 2008-12-18 | Nec Electronics Corporation | Input/output circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297590A (en) * | 2014-09-30 | 2015-01-21 | 东南大学 | Parallel test device based on electric signals |
| CN104316784A (en) * | 2014-09-30 | 2015-01-28 | 东南大学 | Parallel testing apparatus based on photoelectric mixed signals |
| CN109076032A (en) * | 2016-02-23 | 2018-12-21 | 华为技术有限公司 | Calibration phase offset and the FFE auxiliary CDR for improving Baudrate sampling phase-sensitive detector gain |
| CN109076032B (en) * | 2016-02-23 | 2020-09-25 | 华为技术有限公司 | FFE assisted CDR to calibrate phase offset and improve baud rate sample phase detector gain |
| CN109246037A (en) * | 2018-08-13 | 2019-01-18 | 上海奥令科电子科技有限公司 | Driver and HSSI High-Speed Serial Interface transmitter for high-speed serial data transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9077452B2 (en) | QSFP+ to SFP+ form-factor adapter with signal conditioning | |
| US9065644B2 (en) | Full duplex transmission method for high speed backplane system | |
| US20140056346A1 (en) | High-speed parallel decision feedback equalizer | |
| CN111343112A (en) | Method and apparatus for receiving data from a multi-point communication channel | |
| TW202143665A (en) | Optimal equalization partitioning | |
| CN102684945A (en) | Test access port (TAP) equipment | |
| Xie | Datacenter optical interconnects: Requirements and challenges | |
| Almogahed et al. | Performance improvement of mode division multiplexing free space optical communication system through various atmospheric conditions with a decision feedback equalizer | |
| US8379710B2 (en) | Transmitter control in communication systems | |
| Rebola et al. | 10 Gbps CPRI signals transmission impaired by intercore crosstalk in 5G network fronthauls with multicore fibers | |
| CN202563375U (en) | Back panel | |
| CN105450309A (en) | High-speed signal frequency equalization and chirp management method based on single optical filter | |
| Tsunoda et al. | 25.78-Gb/s VCSEL-based optical transceiver with retimer-embedded driver and receiver ICs | |
| WO2023000128A1 (en) | Photoelectric module, communication method, and related device | |
| CN105392071A (en) | Optical line intersection system architecture based on circuit domain | |
| Watanabe et al. | CMOS optical 4-PAM VCSEL driver with modal-dispersion equalizer for 10Gb/s 500m MMF transmission | |
| CN102624617B (en) | Data exchange system and data exchange method | |
| CN205304805U (en) | Physics isolated form giga multi -service optical fiber transmission equipment | |
| CN205249429U (en) | Optical link is system architecture alternately based on circuit territory | |
| US9398354B2 (en) | Integrated assembly for switching optical signals | |
| JP5026355B2 (en) | Electric dispersion equalization circuit | |
| CN211787486U (en) | Remote data information transmission system based on adjustable amplitude encoder | |
| KR100347053B1 (en) | High speed and long distance transmission apparatus for exchange system | |
| Lin et al. | Scalability analysis methodology for passive optical interconnects in data center networks using PAM | |
| Kochumman et al. | Comparison of PMD Compensation in WDM Systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120919 |