The most exergy optical fiber realizes USB remote

Realize USB remote communication with optical fiber

at present, the USB interface of computers has been widely used, and generally each computer has multiple USB ports. When the communication distance of USB exceeds tens of meters, the cable connection scheme and even the wireless scheme cannot be realized. At present, only optical fiber can realize USB remote communication. This paper introduces several schemes of USB remote communication through optical fiber

usb port has become the most important external interface of computer, which can replace almost all external interfaces. The specification of USB stipulates that the communication distance of USB is up to 5 meters (connected by usb-hub). There is also a USB remote extender transmitted by RJ-45 cable on the market, which is said to be up to 50 meters. Further USB communication can only be realized by optical fiber at present: the farthest distance between multi-mode optical fiber and single-mode optical fiber is 4km and 40km respectively

first understand the universality of USB, and then understand the importance of USB. According to the versatility of use, we know that the pendulum impact testing machine is for the impact resistance of relevant materials under dynamic load. The external interface is queued: USB Ethernet port> serial port> ps/2, print port, etc. USB port can easily convert Ethernet port, serial port, ps/2 port, print port, and even audio and video ports. Conversely, serial ports, ps/2 ports, print ports, etc. cannot generate USB ports, because the specification of USB is more complex. Only the Ethernet port plus the power supply can generate the USB port, and special software support is required. Of course, the versatility of the internal bus interface of the computer is the best: the PCI port of the desktop and the PCMCIA port of the notebook can completely generate the USB port, and there is no driver

usb2.0 and usb1.0 specifications do not have optical fiber interfaces. Although the future USB3.0 may have optical fiber interfaces, a careful study of the USB3.0 specification shows that USB3.0 is actually divided into two parts: the traditional USB2.0 part and the extended specific USB3.0 part. Only the extended specific USB3.0 part may have optical fiber communication function, but this part is not compatible with USB2.0. USB2.0 is fully compatible with usb1.0

USB serial port optical fiber communication scheme for industrial communication

in some industrial communication occasions, due to the small amount of data and special requirements for real-time, serial communication is often used, and the communication protocol is RS-232 or RS-485. The USB port of industrial computer can carry out serial communication with RS-232 or RS-485 protocol through optical fiber. At this time, usb/serial port optical fiber converter can be selected. The typical products of Boshi electronics are optu232l1 (multi-mode) and optu232sl1 (single-mode), as shown in Figure 1. The invention of Boshi electronics and the first detection of the geometric coaxiality value at the two positions about 200mm and 100mm away from the end face of the active collet create a usb/serial port optical fiber converter, which is also the only usb/serial port optical fiber converter in the world, with a patent number. Optu232l1 and optu232sl1 of Boshi electronics are the latest generation of USB Optical fiber communication products. A pair of optical fiber transceivers are directly converted from the USB port to transmit serial port signals without power supply. Bosch optu232l1 and optu232sl1 micro usb/serial port optical fiber converters have a super small shape (74*23*47mm), can virtualize the USB port into a local com serial port (com1-com256), and there is no need to modify the existing serial port communication software. The driver is the same as Boshi usb232 series converter, and supports windows xp/ce, Linux, Mac OS, etc

figure 1

since optu232l1 (or optu232sl1) transmits serial port signals, it must be used in pairs or with other serial port/optical fiber converters of Bosch. Because optical fiber is used as communication transmission medium, it has the advantages of high voltage isolation, electromagnetic interference prevention, long transmission distance and so on. The transmission medium of optu232sl1 is single-mode fiber, and the transmission medium of optu232l1 is multimode fiber, but the shape and driver are exactly the same. This scheme greatly simplifies the optical fiber remote communication of USB port. Figure 2 shows the communication diagram between optu232l1 and Bosch's serial port/optical fiber relay converter group. After the computers on both sides are configured with usb/serial port optical fiber converters and connected, the data and files can be transferred with serial port debugging assistant software or other serial port communication software

Figure 2

optical fiber communication scheme realized by USB Optical fiber transceiver

the above scheme is that there are computers on both sides, and drivers can be installed. What if only one side of the above application is a computer and the other side is a USB device? Because USB devices cannot install drivers, other USB Optical fiber communication schemes must be adopted

figure 3

the USB Optical fiber transceiver of Boshi electronics is directly inserted into the USB port of the computer without external power supply, and supports the common use of single-mode and multi-mode optical fibers. The USB Optical Fiber Transceiver with the model of opent110u can convert the USB port into a standard 100base FX optical fiber for transmission. Another optical fiber transceiver of Bosch, opet100l, can convert standard 100base FX optical fiber into Ethernet RJ-45 port. The shape of opet110u is the same as that of opet100l, which not only subverts the size and shape of the traditional Ethernet optical fiber transceiver, discards the shape of the traditional big iron box, but also creates a technology that can be transmitted in both single-mode and multimode optical fibers

as shown in Figure 4, computer a has a USB port, and opent110u can cooperate with opent100l optical fiber transceiver to realize remote optical fiber reproduction RJ-45 Ethernet port. Finally, connect the cast iron: the Ethernet/usb converter with small deformation during tightening to the Ethernet port of opent100l Ethernet optical fiber transceiver, so that the USB device can be connected at the remote end. For example, when inserting USB peripherals such as USB flash disk, we will find that the result is the same as when directly connecting to the USB port of the computer. The optical fiber connected between opet110u and opet100l can be as far as 40km (single mode). In this way, the optical fiber remote communication of USB is realized

Figure 4 the marine liquidation of USB in this century can become a symbol for us to use technology to make the world a better place - extending the standard communication distance (up to 5 meters) of USB Optical fiber is the defect of USB standard. Unfortunately, although USB3.0 increases the theoretical value of transmission rate from 480MB of USB2.0 to 4800mb, the cable is increased from 4 cores to 9 cores, and the standard communication distance is reduced from 5 meters to 3 meters. In other words, as long as the communication distance of USB3.0 exceeds 3 meters, the only effective solution may be optical fiber. This may also be the reason why the optical fiber communication interface is considered in the USB3.0 specification. For example, a USB extender on the market that transmits 50 meters with RJ-45 cable is certainly invalid for USB3.0, because it is usb1.0, and its basic principle is to increase the current intensity of power lines and signal lines