CN1458751A - Multiple business two-way transmission optical terminal machine - Google Patents
Multiple business two-way transmission optical terminal machine Download PDFInfo
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- CN1458751A CN1458751A CN03116880A CN03116880A CN1458751A CN 1458751 A CN1458751 A CN 1458751A CN 03116880 A CN03116880 A CN 03116880A CN 03116880 A CN03116880 A CN 03116880A CN 1458751 A CN1458751 A CN 1458751A
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Abstract
This invention provides a multiservice two-way transmission light terminal machine for transmitting video and audio signals, Ethernet signals and low speed signals on one same platform. The sending part of the said terminal machine includes a premultiple device which multiple-connects digital audio signal and low speed data signal to premultiple signals, an Ethernet interface sending part converting the Ethernet signal into Ethernet parallel signal, and a multiple device multiplying the said signal to serial ASCII stream synchronizing to a same clock signal. The receiving part includes a demultiple device, an Ethernet interface receiving part and a depremultiple device, and the three parts synchronize to the sending-end clock signal.
Description
Technical field
The present invention relates to optical transmission device, be particularly related to a kind of equipment that carries out the multiple business transmission in fiber optic network, it carries out transmitted in both directions by the Digital Multiple Connection Technique multiple connection with video/audio signal, 10/100M ethernet signal and RS485/232 signal on an optical fiber.
Background technology
Along with development of internet technology, tradition also progressively needs to adopt the High Speed IP data transfer mode to look fields such as broadcasting and TV that audio transmission is main business, monitoring.Present solution is to look on the basis of audio transmission network existing, utilizes slack to make up the IP data network in addition, can take the fiber resource of a large amount of preciousnesses like this.So how to make full use of fiber resource, it is the major issue that industry is paid close attention to that multiple business is transmitted on identical platform always.These business comprise the traditional broadcast television business, based on the Network of Ethernet with based on low-speed data service of RS485/232 serial protocol etc.
What tradition broadcasting and TV transmission network was mainly transmitted is to simulate video/audio signal, in order to realize digital multiplexing, at first needs the simulation video/audio signal is sampled, quantized and encodes to convert the digital video-audio signal with binary code representation to.Compare with analog signal, digital signal is more suitable for through Optical Fiber Transmission, and this is because the antijamming capability of digital fiber transmission system is strong, receiver is sensitive high, and transmission range is long, requires low to the linearity of laser, system cost can be reduced, and the not damaged relaying can be realized.This makes system have higher transmission quality and reliability, is easy to make the video index to surpass the requirement of broadcasting first class.
The Fast Ethernet signal can be used as the B platform that Broadcasting Cable Network is set up the IP data, also can be used to transmit data such as IP-based compressing video frequency flow in special-purpose field such as public security, traffic monitoring.Low speed RS485/232 passage then can be used for transmitting signals such as cradle head control.
Summary of the invention
The purpose of this invention is to provide a kind of multi-business bidirectional transmission optical transceiver, it transmits multiple business signals such as video/audio signal, ethernet signal and low speed signal on identical platform.
For achieving the above object, the present invention adopts following technical proposals:
A kind of multi-business bidirectional transmission optical transceiver, comprise with the multiple business signal multiplexing being that the transmission part of serial code stream, the optical transmission module of modulated serial code stream, the wavelength division multiplexer that closes ripple processing modulation signal and partial wave processing received signal, demodulation partial wave signal are with Optical Receivers that obtains serial code stream and the receiving unit of separating multiple connection processing serial code stream, wherein
The sending part branch comprise with digital audio and video signals and low speed data signal multiplexing be the pre-multiplexer of pre-multiplexed signal, Ethernet interface that ethernet signal is converted to the Ethernet parallel signal send part and will and pre-multiplexed signal, digital video parallel signal and the multiple connection of Ethernet parallel signal of line output be the multiplexer of serial code stream, pre-multiplexer, Ethernet interface send part and multiplexer is synchronized with same clock signal;
Receiving unit comprises and recovers with the transmitting terminal clock signal synchronous and serial code stream is separated multiple connection is separating multiplexer, the Ethernet parallel signal being converted to the Ethernet interface receiving unit of ethernet signal and separating the pre-multiplexer of separating that multiple connection goes out digital audio and video signals and low speed data signal from pre-multiplexed signal of parallel output signal, separates the clock signal that pre-multiplexer, Ethernet interface receiving unit and multiplexer are synchronized with transmitting terminal.
In above-mentioned multi-business bidirectional transmission optical transceiver, described ethernet signal is the 10/100M ethernet signal, and Ethernet interface sends part and receiving unit is realized by a MII interface chip, and the frequency of described clock signal is 25MHz.
In above-mentioned multi-business bidirectional transmission optical transceiver, described MII interface chip conciliates multiplexer with the physical layer of multiplexer as the MII interface, and described Ethernet parallel signal is 5 parallel-by-bit signals, and wherein 4 is data-signal, and 1 is the data useful signal.
In above-mentioned multi-business bidirectional transmission optical transceiver, described MII interface chip also comprises exchcange core and buffer unit works in the 10/100M ethernet signal adaptively with realization.
In above-mentioned multi-business bidirectional transmission optical transceiver, described digital audio and video signals is the I2S format signal, described low speed data signal is the RS485/232 signal, and described digital video parallel signal is 10 parallel-by-bit signals, and the speed of described serial code stream is 500Mbps and comprises 4 bits of synchronization information.
In above-mentioned multi-business bidirectional transmission optical transceiver, described digital video signal is by sampling and the analog-to-digital conversion acquisition to composite video signal under described clock signal frequency, described digital audio and video signals is by sampling to simulated audio signal under the 48.83KHz frequency and analog-to-digital conversion obtains, and the sample frequency during the pre-multiple connection of described low speed data signal is 16 times of frequencies to described clock signal.
In above-mentioned multi-business bidirectional transmission optical transceiver, described pre-multiplexer reconciliation budget connects device and is realized by programmable logic array (CPLD).
In above-mentioned multi-business bidirectional transmission optical transceiver, described wavelength division multiplexer is common 1310nm/1550nm Coarse Wave Division Multiplexer.
Description of drawings
Fig. 1 is the The general frame of multi-business bidirectional transmission optical transceiver of the present invention.
Fig. 2 is the block diagram that sends part in the multi-business bidirectional transmission optical transceiver shown in Figure 1.
Fig. 3 is the block diagram of receiving unit in the multi-business bidirectional transmission optical transceiver shown in Figure 1.
Fig. 4 is the schematic diagram of Fast Ethernet MII interface.
Fig. 5 is the interface chip functional block diagram of Ethernet interface transmission and receiving unit among realization Fig. 2 and Fig. 3.
Embodiment
According to the The general frame of multi-business bidirectional of the present invention transmission optical transceiver as shown in Figure 1, look audio frequency (A/V) signal, ethernet signal and RS232/485 low speed signal that transmission part 1 will be imported are transformed to high-speed serial signals and export optical transmission module 2 to, light signal after optical transmission module 2 modulation is sent to Coarse Wave Division Multiplexer (WDM) 3, is closed by it and transmits in optical fiber after ripple is handled.The light signal of importing on the fibre circuit is handled the laggard Optical Receivers 4 of going into through WDM 3 partial waves, is sent to receiving unit 5 by the high-speed serial signals after its demodulation process.Optical transmission module 2 and light-receiving piece 4 can adopt the optical fiber transceiver module that is used for gigabit Ethernet, and WDM can adopt common 1310nm/1550nm Coarse Wave Division Multiplexer.Owing to be transmitted in both directions, so optical transceiver of the present invention does not have the branch of transmitting-receiving, same end is to make a start and is receiving end, and is identical on circuit, and just an end is that 1310nm transmission/1550nm receives on light path, and the other end is 1550nm transmission/1310nm reception.Receiving unit 1 and transmission part 5 are cores of the present invention, are further described below in conjunction with accompanying drawing.
Fig. 2 is the circuit block diagram that optical transceiver shown in Figure 1 sends 1 one preferred embodiments of part.As shown in Figure 2, analog composite video signal (VIDEO) is imported A/D (modulus) converter after clamper, is transformed to the parallel multiplexer 6 that exports to after the 10 bit digital vision signals by it.Two-way audio signal (AUDIO) is transformed to 20 bit digital audio signals and exports pre-multiplexer 7, simplified wiring so greatly to according to the serial code stream of an I2S form behind A/D.The RS485 of low speed and RS232 signal also export pre-multiplexer 7 to after interface is transformed to Transistor-Transistor Logic level.Pre-multiplexer 7 is realized that by programmable logic array (CPLD) its digital audio and video signals and multiple connection of low speed RS385/RS232TTL level signal with input is a Bits Serial signal at a high speed and delivers to multiplexer 6.The Ethernet transformer will be converted to the signal of appropriate level through the 10/100M ethernet signal of RJ45 port input and deliver to Ethernet interface and send part 8, be that 4 bit data (TXD[0-3]) and one digit number walk abreast according to useful signal (TXEN) back and export multiplexer 6 to by its signal transformation with these appropriate level.Multiplexer 6 can be realized that it is incited somebody to action and 10 bit digital vision signals, 5 Ethernet data signals and the multiple connection of 1 pre-multiplexer output signal of line output are highspeed serial data stream by programmable gate array (FPGA), and exports optical transmission module 2 transmissions to.The vision signal of optical transceiver adopts 10 bit sample can guarantee that the signal to noise ratio of vision signal surpasses 65dB, and audio signal adopts 20 bit sample can guarantee that the signal to noise ratio of audio signal reaches 70dB, and such audio-frequency index of looking has all surpassed the level of broadcasting first class.
Fig. 3 is the circuit block diagram of 5 one preferred embodiments of receiving unit in the optical transceiver shown in Figure 1, and as shown in Figure 3, the high-speed serial signals of Optical Receivers 4 outputs exports to after demodulation process separates multiplexer 9.To separate multiple connection be 16 parallel-by-bit data and export the corresponding subsequent processing unit to the serial signal of input to separate multiplexer 9.10 in the parallel signal is digital video signal, and it directly enters video d/a (digital-to-analogue) transducer to revert to composite video signal; A signal is separated serial digital audio signal and the low speed data signal of exporting the I2S form after pre-multiple connection is handled through separating pre-multiplexer 10, the former is converted to simulated audio signal output through audio D/A converter, the latter exports RS485, RS232 signal after the interface conversion, separate pre-multiplexer 10 and also realized by programmable logic array (CPLD); All the other 5 parallel-by-bit data are respectively 4 bit data RXD[0-3] and 1 bit data useful signal RXDV, they are transfused to Ethernet interface and send part 11, are transformed to the serial output signal and are converted to the 10/100Base-Tx signal after RJ45 output by the Ethernet transformer by it.It is worthy of note that for simplified structure, Ethernet interface sends part 8 and receiving unit 11 can be realized by same chip.
In above-mentioned transmission part 1, it is benchmark that the multiple connection process of multiplexer 6 is actually with the reference clock, signal on 16 position datawires of parallel input is read successively, and being transformed to speed is the high-speed serial data signal of reference clock integral multiple (being 20 times here), be that frequency is the serial signal of 500Mbps, 4 signals of here all the other are used to synchronously.Therefore in order to guarantee the synchronous of miscellaneous service, must make the work clock of the preceding each several part of multiple connection all be synchronized with reference clock.
In above-mentioned receiving unit 3, the multiple connection process of separating of separating multiplexer 9 is actually and recovers with the synchronous reference clock signal of transmitting terminal and be benchmark with this reference clock, with the signal transformation of serial input is on 16 position datawires and the signal of line output, and separates after the multiple connection work clock of each several part and all be synchronized with and recover the reference clock synchronous with transmitting terminal of coming out.
In this embodiment of the present invention, employing media independent interface (MII) is finished the conversion between ethernet signal and the parallel signal.Consider the interface rate of 100M Fast Ethernet, the reference clock signal frequency that the multiple connection process is conciliate in multiple connection is selected as 25MHz.Particularly, for the MII interface, as shown in Figure 4, its interface signal is divided into transmission and receives two groups, and wherein, the MII interface transmits the parallel 4 bit code groups that the 100Mbps serial data stream becomes 25M, so the clock signal frequency that Ethernet interface needs is 25MHz.
(TXCLK is the 25MHz external clock though standard MII interface also provides tranmitting data register TXCLK and receive clock RXCLK, RXCLK is by recovering in the data flow), but all provide by physical layer, because the data flow RXD[0-3 of physical layer interface chip output] be synchronized with RXCLK, if therefore directly the ethernet physical layer chip is received on the multiplexer by the MII interface, the reference clock of itself and multiplexer and asynchronous then is so can't realize synchronous multiplexing.
The present invention adopts the synchronous of output stream that the chip with following special construction realizes Ethernet interface and reference clock for this reason.As shown in Figure 5, this chip comprises ethernet physical layer interface function and MAC layer function, and comprises an exchcange core and data buffer storage unit.In this implementation, multiplexer 6 and separate the physical layer that multiplexer 9 all is regarded as the MII interface, the function of MAC layer realizes by this interface chip, so the clock signal of this chip has realized clock synchronization thus all by multiplexer 6 and separate multiplexer 9 and provide.After adopting this chip, the Ethernet interface of optical transceiver outside remains RJ45, and data will be through buffer memory and exchange after entering optical transceiver, and the exchcange core here can play the effect of isolating in-house network, and large capacity cache then can be realized speed conversion.Because MAC layer and multiplexer/the MII interface of separating multiplexer is full duplex work, therefore can save the holding wire that needs when half-duplexs such as TXER, RXDV, CRS, RXER, COL are done, make the holding wire that needs to transmit be reduced to TXD[0-3], TXEN, RXD[0-3] and 10 of RXDV etc.In addition, owing to comprise exchange and buffer unit, so can work in the 10/100M ethernet signal adaptively.
The primary reference clock of more than having determined multiple connection is 25MHz, can be obtained the work clock of each several part by this reference clock.The 25MHz reference clock can be directly adopted in the sampling of composite video, and attention should be selected the video a/d converter of sample rate greater than 25Mz for use.The present invention adopts delta sigma dual-channel audio A/D converter, chip internal with input clock 256 frequency divisions as sampling clock, in pre-multiplexer with after 25MHz reference clock 2 frequency divisions as the input clock of audio A/D, audio sampling frequency is about 48.83KHz like this, satisfies the requirement of sampling law.The multiple connection of low speed data is directly in pre-multiplexer the input low speed data to be carried out 16 samplings, and sampling clock also is to be got by the primary reference clock frequency division.
By above analysis, in sending part 1, the clock of all functions module all is synchronized with the 25MHz primary reference clock, just can finish the synchronous multiplexing of all functions like this in multiplexer.Equally, each functional module all works in and separates the 25MHz clock that multiplexer recovers in the receiving unit 5, and the clock synchronization that therefore receives and send can guarantee that each several part correctly recovers primary signal.
In order to realize synchronously, look the sampling of audio frequency and can adopt the non-standard sample frequency that satisfies sampling thheorem, because the multi-business bidirectional that the present invention realizes transmission optical transceiver can independently constitute a system, as long as so choosing of sample rate and quantization digit satisfy sampling thheorem and look audio-frequency index.
Though in above-mentioned preferred embodiment, ethernet signal is the 10/100M ethernet signal, and the frequency of described clock signal is 25MHz.But the present invention also can be applied to other ethernet signal, and the frequency of clock signal also can be got other numerical value according to the application employing of reality, these all are that those skilled in the art are easy to predict in reading above-mentioned specification, therefore do not give unnecessary details.
In above-mentioned preferred embodiment, the Ethernet parallel signal is 5 parallel-by-bit signals, wherein 4 is data-signal, 1 is the data useful signal, the digital video parallel signal is 10 parallel-by-bit signals, and the speed of serial code stream is 500KHz and comprises 4 bits of synchronization information that the sample frequency of vision signal is 25MHz, the sample frequency of audio signal is 48.83, and the sample frequency during the pre-multiple connection of low speed data signal is 16 times of frequencies to described clock signal.Choosing of above-mentioned these concrete numerical value depended on concrete application scenario and how to choose for those skilled in the art also be conspicuous, and therefore concrete numerical value should not be construed as the qualification to the present invention's spirit and protection range.
Claims (8)
1, a kind of multi-business bidirectional transmission optical transceiver, comprise with the multiple business signal multiplexing being that the transmission part of serial code stream, the optical transmission module of modulated serial code stream, the wavelength division multiplexer that closes ripple processing modulation signal and partial wave processing received signal, demodulation partial wave signal are with Optical Receivers that obtains serial code stream and the receiving unit of separating multiple connection processing serial code stream, it is characterized in that
The sending part branch comprise with digital audio and video signals and low speed data signal multiplexing be the pre-multiplexer of pre-multiplexed signal, Ethernet interface that ethernet signal is converted to the Ethernet parallel signal send part and will and pre-multiplexed signal, digital video parallel signal and the multiple connection of Ethernet parallel signal of line output be the multiplexer of serial code stream, pre-multiplexer, Ethernet interface send part and multiplexer is synchronized with same clock signal;
Receiving unit comprises and recovers with the transmitting terminal clock signal synchronous and serial code stream is separated multiple connection is separating multiplexer, the Ethernet parallel signal being converted to the Ethernet interface receiving unit of ethernet signal and separating the pre-multiplexer of separating that multiple connection goes out digital audio and video signals and low speed data signal from pre-multiplexed signal of parallel output signal, separates the clock signal that pre-multiplexer, Ethernet interface receiving unit and multiplexer are synchronized with transmitting terminal.
2, multi-business bidirectional transmission optical transceiver as claimed in claim 1, it is characterized in that, described ethernet signal is the 10/100M ethernet signal, and Ethernet interface sends part and receiving unit is realized by a MII interface chip, and the frequency of described clock signal is 25MHz.
3, multi-business bidirectional transmission optical transceiver as claimed in claim 2, it is characterized in that described MII interface chip conciliates multiplexer with the physical layer of multiplexer as the MII interface, and described Ethernet parallel signal is 5 parallel-by-bit signals, wherein 4 is data-signal, and 1 is the data useful signal.
4, multi-business bidirectional transmission optical transceiver as claimed in claim 3 is characterized in that described MII interface chip also comprises exchcange core and buffer unit works in the 10/100M ethernet signal adaptively with realization.
5, as claim 3 or 4 described multi-business bidirectional transmission optical transceivers, it is characterized in that, described digital audio and video signals is the I2S format signal, described low speed data signal is the RS485/232 signal, described digital video parallel signal is 10 parallel-by-bit signals, and the speed of described serial code stream is 500Mbps and comprises 4 bits of synchronization information.
6, multi-business bidirectional transmission optical transceiver as claimed in claim 5, it is characterized in that, described digital video signal is by sampling and the analog-to-digital conversion acquisition to composite video signal under described clock signal frequency, described digital audio and video signals is by sampling to simulated audio signal under the 48.83KHz frequency and analog-to-digital conversion obtains, and the sample frequency during the pre-multiple connection of described low speed data signal is 16 times of frequencies to described clock signal.
7, as claim 1 or 6 described multi-business bidirectional transmission optical transceivers, it is characterized in that described pre-multiplexer is conciliate pre-multiplexer and realized by programmable logic array (CPLD).
8, as claim 1 or 7 described multi-business bidirectional transmission optical transceivers, it is characterized in that described wavelength division multiplexer is common 1310nm/1550nm Coarse Wave Division Multiplexer.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031168809A CN1220346C (en) | 2003-05-13 | 2003-05-13 | Multiple business two-way transmission optical terminal machine |
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| CNB031168809A CN1220346C (en) | 2003-05-13 | 2003-05-13 | Multiple business two-way transmission optical terminal machine |
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| CN1458751A true CN1458751A (en) | 2003-11-26 |
| CN1220346C CN1220346C (en) | 2005-09-21 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101888273A (en) * | 2010-07-14 | 2010-11-17 | 南京泰通电子科技有限公司 | Optical transmitter and receiver with Ethernet function |
| CN101232361B (en) * | 2008-01-11 | 2011-03-16 | 北京邮电大学 | Method and apparatus for multiplexing multi-path same grade heterogeny data |
| CN102142949A (en) * | 2011-03-29 | 2011-08-03 | 中航光电科技股份有限公司 | Method for automatically and transparently transmitting two paths of serial signals in full-redundancy manner |
| CN1866803B (en) * | 2005-09-13 | 2012-05-30 | 华为技术有限公司 | Method for solving clock synchronization in total Ethernet |
| CN102523436A (en) * | 2011-11-30 | 2012-06-27 | 杭州海康威视数字技术股份有限公司 | Transmission terminal, receiving terminal, multi-channel video optical fiber transmission system and multi-channel video optical fiber transmission method |
| CN106301651A (en) * | 2016-08-09 | 2017-01-04 | 邦彦技术股份有限公司 | Data transmission method and device |
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| CN102740061B (en) * | 2012-06-14 | 2014-07-16 | 北京蛙视通信技术有限责任公司 | High-definition optical transceiver and multimedia video digital signal processing method |
| US9197697B2 (en) | 2014-03-10 | 2015-11-24 | Gazoo, Inc. | Cloud computing system and method |
| US9195429B2 (en) | 2014-03-10 | 2015-11-24 | Gazoo, Inc. | Multi-user display system and method |
| WO2015138487A2 (en) * | 2014-03-10 | 2015-09-17 | Gazoo, Inc. | Video streaming system and method |
| US9306744B2 (en) | 2014-03-10 | 2016-04-05 | Gazoo, Inc. | Video cryptography system and method |
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2003
- 2003-05-13 CN CNB031168809A patent/CN1220346C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866803B (en) * | 2005-09-13 | 2012-05-30 | 华为技术有限公司 | Method for solving clock synchronization in total Ethernet |
| CN101232361B (en) * | 2008-01-11 | 2011-03-16 | 北京邮电大学 | Method and apparatus for multiplexing multi-path same grade heterogeny data |
| CN101888273A (en) * | 2010-07-14 | 2010-11-17 | 南京泰通电子科技有限公司 | Optical transmitter and receiver with Ethernet function |
| CN102142949A (en) * | 2011-03-29 | 2011-08-03 | 中航光电科技股份有限公司 | Method for automatically and transparently transmitting two paths of serial signals in full-redundancy manner |
| CN102142949B (en) * | 2011-03-29 | 2014-09-10 | 中航光电科技股份有限公司 | Method for automatically and transparently transmitting two paths of serial signals in full-redundancy manner |
| CN102523436A (en) * | 2011-11-30 | 2012-06-27 | 杭州海康威视数字技术股份有限公司 | Transmission terminal, receiving terminal, multi-channel video optical fiber transmission system and multi-channel video optical fiber transmission method |
| CN102523436B (en) * | 2011-11-30 | 2014-01-15 | 杭州海康威视数字技术股份有限公司 | Transmission terminal, receiving terminal, multi-channel video optical fiber transmission system and multi-channel video optical fiber transmission method |
| CN106301651A (en) * | 2016-08-09 | 2017-01-04 | 邦彦技术股份有限公司 | Data transmission method and device |
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