Solution for USB to Fiber Optic Converter


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To introduce the solution for USB to fiber optic transceiver.

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  • Solution for U es Bee to Fiber Optic Converter
  • Welcome to the training module on Solution for USB to Fiber Optic Converter . To help with this, we will discuss U S B technology, Fiber Optic technology, Solution block diagram and Recommend parts.
  • The Universal Serial Bus (USB) is a common communication interface standard. USB supports hot-swap, which means it can be installed and removed without rebooting computers. This advantage makes it become the most popular connection standard for the consumer devices such as PCs, digital cameras, printers and media players. With the development of USB technology, its data transfer rate has increased from 1.5Mbit/s to 4.8Gbit/s. Additionally, the emergence of USB OTG (On-The-Go) technology makes it possible to realize communication between devices without any host, thus increasing the flexibility of USB applications. However, the limit on transfer distance of USB narrows its applications: the maximum cable length of USB1.1 is 5 meter for full speed. Even the USB 2.0 permits several levels of USB hubs in a long chain, the distance can’t be longer than 100 meters.
  • In recent years it has become apparent that fiber-optics are steadily replacing copper wire as an appropriate means of communication signal transmission. Fiber optic communication uses light pulses to transmit information through an optic fiber. The process of communicating using fiber-optics involves the following basic steps: Creating the optical signal involving the use of a transmitter, relaying the signal along the fiber, ensuring that the signal does not become too distorted or weak, receiving the optical signal, and converting it into an electrical signal. Using fiber optic cable, optical communications have enabled the communications links to be made over much greater distances and with much lower levels of loss in the transmission medium and possibly most important of all, fiber optic communications has enabled much higher data rates to be accommodated.
  • As we mentioned before, the biggest limitation of USB transmission is that its maximum range is 5 meters only. This USB to fiber optic converter boosts the connectivity of USB signals. This allows users to control cameras, printers, scanners, storage devices, and other USB devices remotely from computers through the use of fiber optics. Furthermore, many commercial and industrial environments present electrical noise and ground differential challenges, especially over long distances. Fiber optic links solve these problems by providing high bandwidth connections that are impervious to noise and ground differentials. The picture here illustrates the function of USB to Fiber Optic converter. The user can access different USB devices transparently, just like accessing them through USB cable.
  • In our solution, the USB-to-fiber optic converter is made up of USB physical interface, optical transceiver module and control module, as well as power supply and auxiliary circuit. USB interface converts USB differential signal into normal signal that can be processed by FPGA. Usually, a USB transceiver is used to achieve this function. Optical transceiver implements conversion between optical and electronic signals, and then sends out the converted signals. Control module is a FPGA chip used for packing the data from optical transceiver and unpacking the data from USB transceiver.
  • Our solution is based on FPGA design. Due to the limitation of USB specification, the USB electrical signal is unable to be converted into light signal directly through optic transceivers. However, the USB data packet has to be unpacked and re-processed by the FPGA; on the other direction, the FPGA analysis the signal from optic transceiver, pack the data and sends it to USB transceiver.
  • The Cyclone III family introduces a number of new milestones for the low cost FPGA industry. Number one, it is the first announced and available low cost 65nm FPGA in the industry. Number two, it is the first low cost FPGA which offers more than 100K logic elements, or about 2X the competing FPGAs. Number three, it is the first FPGA ever manufactured on a low power process. The power benefits of this engineering strategy are substantial, with up to 50% lower power than Altera’s previous architecture, and up to 75% lower power than competing low cost FPGAs. If you take the largest Cyclone III device, the EP3C120, its typical static power consumption at 85 degrees C is 170 milliwatts. If you compare this to the leading 90-nm competing device, you have a static power consumption of 480 mW for their largest device. However, you need two of them to implement the same functionality, so the total power of an equivalent solution is 960 mW. They are even more significant when you look at the unprecedented combination of power consumption, high functionality and low cost that come together in this architecture. By increasing the logic density to 120K logic elements, tripling the available RAM, and doubling the amount of dedicated multiplier circuitry in the device, you can now implement designs in low cost FPGAs that you never imagined possible.
  • One end of the USB transceiver is connected to USB connector for USB communication with the host PC. Another end is connected to FPGA for signal processing. The major function of the USB transceiver is to drive and receive USB differential signals on the USB cable. It is able to convert the differential voltage to digital logic signal levels which can be processed by FPGA. Meanwhile, it can also convert logic levels to different USB signals. The USB transceivers we selected are compliant with the Universal Serial Bus Specification Rev. 2.0. These devices can transmit and receive serial data at both full-speed (12-Mbit/s) and low-speed (1.5-Mbit/s) data rates.
  • The fiber optic transceiver interfaces with optical fiber cables and the FPGA. The fiber cables can be either signal mode or multimode. The transceiver includes both a transmitter and a receiver in the same component. These are arranged in parallel so that they can operate independently of each other. Both the receiver and the transmitter have their own circuitry so that they can handle transmissions in both directions. The transmitter transforms the electrical signal into fiber optic signal, and the receiver is used to convert the optical signal back to an electrical signal.
  • Here we list some recommendation for other functional blocks.
  • Thank you for taking the time to view this presentation on Solution for USB to Fiber Optic Converter. If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more design resources you may either visit the element14 site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit Element 14 e-community to post your questions.
  • Solution for USB to Fiber Optic Converter

    1. 1. Solution for USB to Fiber Optic Converter
    2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce the solution for USB to fiber optic transceiver. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>USB technology </li></ul></ul><ul><ul><li>Fiber Optic technology </li></ul></ul><ul><ul><li>Solution block diagram </li></ul></ul><ul><ul><li>Recommend parts </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>12 pages </li></ul></ul>
    3. 3. USB Communication <ul><li>Asynchronous serial wired communication </li></ul><ul><li>Easy connectivity </li></ul><ul><li>Allow hot swapping </li></ul><ul><li>Data Rate </li></ul><ul><ul><li>USB 1.0 (low speed mode): 1.5 Mbps </li></ul></ul><ul><ul><li>USB 1.1 (full speed mode): 12 Mbps </li></ul></ul><ul><ul><li>USB 2.0 (high speed mode): 480 Mbps </li></ul></ul><ul><ul><li>USB 3.0 (super speed mode): 4.8 Gbps </li></ul></ul><ul><li>USB transmits data differentially on a single pair of wires. </li></ul><ul><li>The maximum cable length is five meters or approximately 15 feet. </li></ul>
    4. 4. Fiber Optic Communication <ul><li>Fiber optic communication uses light pulses to transmit information through an optic fiber. </li></ul><ul><li>Fiber optic communication system consists of: </li></ul><ul><ul><li>Optic transmitter (light source): converts electrical signal into equivalently light pulses. </li></ul></ul><ul><ul><li>Optic fiber cable </li></ul></ul><ul><ul><li>Optic receiver (Detector): recovers the light signal to an electrical signal. </li></ul></ul><ul><li>Advantages of fiber optics </li></ul><ul><ul><li>Low signal attenuation </li></ul></ul><ul><ul><li>High bandwidth allows more data to be delivered </li></ul></ul><ul><ul><li>No interference </li></ul></ul><ul><ul><li>Total electrical isolation </li></ul></ul>Optic Fiber Optic Transmitter Optic Receiver Electrical Signal Light Output Electrical Signal Light
    5. 5. Why need USB to Fiber Optic Converter? <ul><li>Challenges of USB transmission: </li></ul><ul><ul><li>The maximum transmission range of USB is 5 meters. </li></ul></ul><ul><ul><li>Many commercial and industrial environments present electrical noise and ground differential challenges. </li></ul></ul><ul><li>Fiber Optics solution </li></ul><ul><ul><li>Support long distance transmission </li></ul></ul><ul><ul><li>Resistance to EMI/RFI and transient surges </li></ul></ul>Optic Fiber USB Cable USB Cable USB to Fiber Optic Converter USB to Fiber Optic Converter USB Cable USB Cable USB Cable
    6. 6. Recommend Solution
    7. 7. FPGA Selection Guide Manufacturer Part Number Serial No. of Logic Blocks No. of I/O Operating Frequency (MHz) Voltage Supply (V) Altera EP2C20F484C8N Cyclone II 18752 315 320 1.15-3.465 Altera EP2C20F256C8N Cyclone II 18752 152 320 1.15-3.465 Altera EP1C20F400C8N Cyclone 20060 301 275 1.4-3.6 Altera EP2C20Q240C8N Cyclone II 18752 142 320 1.15-3.465 Altera EP1C20F324C8N Cyclone 20060 301 275 1.4-3.6 Altera EP3C25E144C8N Cyclone III 24624 82 402 1.15-3.465
    8. 8. Altera Cyclone III FPGA <ul><li>Industry’s first 65-nm low-cost FPGAs </li></ul><ul><li>Low power </li></ul><ul><ul><li>TSMC’s 65-nm low-power (LP) process </li></ul></ul><ul><ul><li>Quartus II PowerPlay analysis and optimization technology </li></ul></ul><ul><ul><li>120K LEs under 0.5W static </li></ul></ul><ul><ul><ul><li>Compared to Stratix III device under 1.5W static </li></ul></ul></ul><ul><li>High functionality </li></ul><ul><ul><li>Broadest range of densities with the most memory and DSP resources </li></ul></ul><ul><ul><ul><li>Logic: 5K to 120K LEs </li></ul></ul></ul><ul><ul><ul><li>Memory: Up to 4 Mbits </li></ul></ul></ul><ul><ul><ul><li>DSP: Up to 288 18 x 18 multipliers </li></ul></ul></ul><ul><li>Low cost </li></ul><ul><ul><li>Low-cost architecture on 65-nm process </li></ul></ul>Low Power High Functionality Low Cost
    9. 9. USB Transceiver Selection Guide Manufacturer Part Number USB Version Speed Supply Voltage (V) ESD Protect (±kV) TI TUSB1105 USB 2.0 Full / Low Speed 3.3-5 ±15 TI TUSB1106 USB 2.0 Full / Low Speed 3.3-5 ±15 TI TUSB2551A USB 2.0 Full / Low Speed 3.3-5 ±15 Fairchild USB1T11A USB 1.1 Full / Low Speed 3.3 ±9 Fairchild USB1T20 USB 2.0 Full / Low Speed 3.3 ±9.5 Fairchild USB1T1105A USB 2.0 Full / Low Speed 3.3 ±15 Maxim MAX3346E USB 2.0 Full / Low Speed 4-5.5 ±15 Maxim MAX3345E USB 2.0 Full / Low Speed 4-5.5 ±15 ST-ERICSSON ISP1507 USB 2.0 High / Full / Low Speed 3-3.6 ±4 EXAR SP5301CY-L USB 2.0 Full / Low Speed 3.3-5  
    10. 10. Fiber Optic Transceiver Selection Guide Manufacturer Part Number Description Date Rate (MBd) Dominate Wavelength (nm) Output Optical Power (dBm) Input Optical Power (dBm) Fibre Type Avago AFBR-5103TZ MMF Transceiver for ATM and Fast Ethernet 125 1300 -16 -34.5 Multimode Avago AFBR-5803ATZ MMF Transceiver for Fast Ethernet (100Base-FX)/ATM/FDDI, 1x9 125 1300 -20 -33.9 Multimode Avago AFBR-5903Z Transceiver for Fast Ethernet (100Base-FX)/ATM/FDDI, 125 1300 -15.7 -34.5 Multimode Avago HFBR-57E0LZ SFP Transceiver for Fast Ethernet/ATM/FDDI and SONET OC-3 125/155 1300 -15.7 -30 Multimode Avago HFBR-5963LZ MMF Transceiver for Fast Ethernet / ATM / FDDI and SONET OC-3 125/155 1300 -15.7 -31 Multimode Avago HFBR-5961ALZ Multi Mode SFF Transceiver with LC connector 125/155 1300 -15.7 -30 Multimode
    11. 11. Peripheral Solution Block Farnell Newark Power Adaptor Click Click Fiber-Optic Click Click LDO Click Click LED Click Click
    12. 12. Additional Resource <ul><li>For ordering solution related products, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For more design resources go to </li></ul><ul><ul><li> </li></ul></ul><ul><li>Visit Element 14 to post your question </li></ul><ul><ul><li> </li></ul></ul><ul><li>For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility </li></ul>