JPH02162847A - Optical space transmission unit - Google Patents

Abstract

PURPOSE:To confirm the operation simply by providing a light emitting element lighted respectively when an optical pulse signal of a space transmission system and a transmission signal of a wired transmission system is received. CONSTITUTION:A transmission/reception gate control circuit 8 opens a transmission gate 9 when a transmission signal is sent via a line l and opens a reception gate 10 when a reception signal is sent. Then light emitting diodes LD1, LD2 lighted at the output of transmission reception gates 9, 10 of the transmission/ reception gate control circuit 8 are provided. Moreover, the color of the light emitting diodes LB1, LD2 is made different. Thus, in the case of normal transmission signal, whether or not the light emitting diodes LD1, LD2 are alternately lighted is confirmed to discriminate normal operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an optical space transmission unit of a data transmission system used in a local area network etc. in which a large number of personal computers etc. are connected and data is transmitted between them. It is. [Prior Art] Conventionally, a local area network (LAN) using a personal computer as a work stage has been developed.
), data was transmitted by connecting each work stage with a wired transmission line. In other words, the nearby work stage tank is connected with a transmission line such as R S 422 or R34B5 wired by floor wiring or desk wiring, and the work stage tank is connected to a work stage tank located a little further away or to a work stage tank on another floor. Data transmission is performed by connecting with a transmission line wired with ceiling wiring etc. between the two. However, when a wired transmission line is used in this way, the wiring work is time-consuming and the aesthetic appearance is also degraded. Therefore, the inventors of the present invention used optical space transmission for the vertical wiring between the floor or desk top and ceiling and the vertical wiring, thereby eliminating the vertical wiring and the vertical wiring, thereby saving the trouble of wiring work. We are proposing a data transmission system that does not spoil the aesthetic appearance. This data transmission system, as shown in FIG. 21.) is equipped with a plurality of workstation groups, each of which has a terminal space transmission unit (3z3□, 33...) for each 5-work stage group, and is connected to each other by a wired transmission line l. Units 31, 32, 3. ...
(a plurality of spatial transmission units for satellites corresponding one-to-one to each other) 1. ．． 1□, 1, ... are installed on the ceiling, and half-duplex data transmission is performed using optical pulse signals between the corresponding space transmission units (for example, 1, 3, etc.), and data transmission between workstation groups is performed. Data transmission is carried out via a wired transmission line on the ceiling, and all workstations 2 to 2
2 + p + 221 to 22:ll 231 to 2o . . . so that data can be transmitted to each other. [Problem to be Solved by the Invention 1] However, in such a data transmission system, as described above, the terminal space transmission unit 3 installed on a desk or the like is installed facing the satellite space transmission unit 1 installed on the ceiling side. However, since the terminal air/dark transmission unit 3 has sharp directivity, is it possible to use both space transmission units? ) It was difficult to align the optical axis of Is3. In other words,
In the past, data was transmitted from the work stage unit 1, which is a personal computer at the top of the room, and the confirmation operation was repeated by checking the display on the work stage 3 unit to see if it was operating normally. The optical axis was being aligned. For this reason, in the past, it took a lot of effort to check the operation and align the optical axes of the spatial transmission units 1 and 3. The present invention has been made in view of the above-mentioned points, and the specific invention aims to make it easy to confirm the operation, and the related invention aims to make it easy to align the optical axis. El! ! Means for Solving the Problem] In order to achieve the above object, in the specific invention, each output of the above interface means when receiving a transmission signal of a wired transmission system and a likelihood pulse signal of a space transmission system, r:1. It is equipped with a light-emitting display element that lights up. In addition, in order to achieve the above object, the related invention provides a test signal transmitting means for transmitting a test signal that can be distinguished from a normal transmission signal, and a reception level of a test signal transmitted from an optical space transmission unit on the other side. and a sounding body that sounds in response to the output of the reception level detection means. (Function) In the specified invention, the normal operation is achieved by lighting up the light emitting display element with the respective outputs of the interface means when receiving the transmission signal of the wired transmission system and the optical pulse signal of the spatial transmission system as described above. The operating state of the interface means during the operation can be displayed using a light emitting display element, thereby making it possible to visually confirm that the optical spatialization unit is operating normally. Furthermore, in a related invention, it is possible to audibly recognize whether or not the optical axis is aligned by using a sounding body that sounds in accordance with the reception level of the test signal. [Embodiment 11 FIG. 1 shows an embodiment of the specific invention, and the basic configuration of a data transmission system to which this specific invention is applied is the same as that shown in FIG. 5. The spatial transmission units 1 and 3 of this embodiment include an optical transmitting circuit 4 consisting of a light emitting element 41 and a transmitting driver 42, a light receiving element 51, a receiving amplifier 52, and a logic F! ! The optical receiving circuit 5 includes a conversion circuit 53, a line receiver 6, and a line driver buffer.
A transmission signal such as an NRZI signal transmitted from the optical transmission circuit 4 is converted into an optical pulse signal and transmitted, and an optical reception circuit 5 receives the optical pulse signal and demodulates it into a transmission signal.
This transmission signal is passed through the line driver buffer to the transmission line p.
Send to. Note that the logic conversion circuit 53 is the receiving amplifier 52.
This is to shape the waveform of the output. In addition, in the space transmission units 1 and 3, a transmission gate 9 is provided between the optical transmission circuit 4 and the line receiver 6, and a reception date 10 is provided between the optical reception circuit 5 and the line driver buffer. A transmission/reception date control circuit 8 controls the opening/closing of the transmission date 9 and reception gate 10 so that the transmission signal and the reception signal do not collide. Note that whether the space transmission unit is used for a terminal or for a satellite is selected by switching the switch S W +. The line receiver 6, the line driver buffer, the transmission date 9, the reception date 10, and the transmission/reception date control circuit 8 constitute an interface means, and the interface means reflects a transmission signal to become a reception signal. Alternatively, this is to prevent the original received signal from going around and becoming the transmitted M signal again. Here, work stages a2,1 to 2.3. I will briefly explain the basic data transmission method between... In addition, in the following explanation, Works Steel Silane 2□
The case of transmitting data from . 7-The transmission signal from the station 1in 211 is a transmission line! , the space transmission unit for the terminal 3. is converted into an optical pulse signal and transmitted to the corresponding satellite space transmission unit 11 on the ceiling side, and is also transmitted to the transmission line 11.
The data is sent to work stages 5 212 and 211 via . The spatial transmission unit 1 that received the optical pulse signal demodulates the transmission signal and sends it to the transmission line! Send to. Another satellite space transmission unit that captures the transmission signal sent through this transmission line 1) 12,1. operates in the same manner as the terminal space transmission unit 31 to convert the transmission signal into an optical pulse signal again, and the terminal space transmission unit 3□. 3. Send to. Then, the space transmission unit for the terminal that received this optical pulse signal) 3. ．． 3. operates in the same manner as the satellite spatial transmission unit 11, and sends the transmission signal to each work stage thin 221-2 through each transmission line 12+Is. ．． ．． 2□～21. send to In other words,
The transmission data transmitted by the work stage switch 2□ will be transmitted to all the work stage switches 212... Note that even if a wired transmission system and an optical space transmission system coexist as in this data transmission system, data transmission is performed normally because transmission and reception are performed in half duplex by the function of the interface means. By the way, the power of light emitted from the space transmission unit 1.3 is constant, and the received light power varies depending on the directionality of the terminal empty T11 transmission unit 3 and the distance of the space transmission unit 1.31 flll. The level is too high,
Alternatively, a transmission error may occur due to the received light level being too low. Therefore, in order to perform transmission while maintaining the optimum reception condition, the spatial transmission units 1 and 3 of this embodiment are provided with reception gain adjustment means for adjusting the gain of the reception amplifier. It should be noted that since it is inconvenient to change the receiving gains of both the satellite and terminal spatial transmission units 1 and 3, in this embodiment the gain of the receiving M7 amplifier of the terminal spatial transmission unit 3 is adjusted. Specifically, the reception gain adjustment means includes a reception level detection circuit 11 that detects the reception level from the output of the reception amplifier 52 shown in FIG. 1, a gain adjustment circuit 12 that adjusts the gain of the reception amplifier 52, and Reception level detection circuit 11
The signal processing circuit 13 is a microcomputer that determines the gain of the reception amplifier 52 which is adjusted by the gain adjustment circuit 12 from the output of the signal processing circuit 13 . The operation of the reception gain adjusting means will be explained below. In order to adjust the reception gain, a test signal shown in FIG. 3(b), which is different from the main transmission signal shown in FIG. 3(a), is used.
This reception gain adjustment is performed when the transmission signal is not being transmitted. Note that the test signal has a wider pulse width than the actual transmission signal, so that it can be easily distinguished from the transmission signal and the level f1 can be determined easily. When the power is turned on, the signal processing circuit 13 made up of a microcomputer is initialized and the written program is executed from the beginning. First, the signal processing circuit 13 turns off the transmission date 9 and the reception date 10,
This state is maintained so that transmission signals are not transmitted or received. Next, determine whether you are a satellite or a terminal. The settings for the satellite and for the terminal are performed by setting the switch SW described above. In the case of the satellite space transmission unit 1, the test signal created by the signal processing circuit 13 is sent to the terminal space transmission unit 3. and send. Thereafter, it waits for the terminal space transmission unit 3 to send back a confirmation signal indicating that the reception data has been adjusted based on this test signal. When the confirmation signal is received, the transmitting/receiving data (9.10) is released from the off state and enters a state in which normal transmission signals can be transmitted and received. On the other hand, in the case of the terminal spatial transmission unit 3, it waits for the test signal from the satellite spatial transmission unit 1 to be transmitted, and when the test signal is received, the reception level is detected from the output of the reception amplifier 52. The signal processing circuit 13 determines a value that optimizes the reception dein of the reception amplifier 52 according to the level detected by the circuit 11, and the gain adjustment circuit 12 adjusts the reception dein of the reception amplifier 52 based on the output of the signal processing circuit 13. conduct. After that, a confirmation signal indicating that the reception gain adjustment has been completed is sent to the satellite spatial transmission unit 1, and the transmission/reception data (9.10) is released from the off state, allowing normal transmission and reception of transmission signals. enter the state. Note that although the above description has been made regarding the time when the power is turned on, it is of course possible to perform the process when no transmission signal is being transmitted. By the way, the above-mentioned transmission/reception date control circuit 8 is shown in FIG.
) is sent via the transmission line l, the transmission date 9 is opened as shown in (b) of the same figure, and when the received signal shown in (c) of the same figure is sent, the same Figure (d)
It operates to open the received data) 10 as shown in FIG. Therefore, in this embodiment, light emitting diodes LD, LD2 are provided which emit light with the output to the wave transmitting/receiving date (9.10) of the wave transmitting/receiving date control circuit 8. Note that the colors of the respective light emitting diodes LD are different. Further, transistors Q, , Q are drive transistors. In this way, if the light-emitting diodes LD, LD2 are provided that emit alpha light when the wave transmitting/receiving data (9.10) is opened and closed, the above-mentioned opening transmission units 1 and 3 will be installed, and the normal transmission signal will be transmitted. When transmitting, the light emitting diode LD,
By checking whether the LD lights up alternately, it is possible to judge whether normal operation is being performed during normal operation or during maintenance, and the occurrence of this failure can be easily discovered. [Embodiment 21] In the above-described embodiment of the specific invention, the reception gain adjustment means adjusts the reception gain of the terminal space transmission unit 3 to an optimal state so that transmission and reception are performed satisfactorily;
Also, space transmission unit 1 for satellite and terminal
．． 3. Check whether the light emitting diode L is working normally.
Although it was possible to check from the lighting state of D, LD, it was not possible to check whether the optical axis was in the proper direction. Therefore, in this embodiment, which is an embodiment of the related invention, it is possible to confirm that the optical axes of the spatial transmission units 1 and 3 are optimized. In the above embodiment, the directivity of the satellite spatial transmission unit 1 on the ceiling side is widened, and the terminal spatial transmission unit 3
However, in this embodiment, the spatial transmission units 1 and 3 for both the cost and the ceiling side have narrowed directivity, that is, the spatial transmission unit 3 for the terminal is used for both. This applies to the data transmission system used. Note that in this case, optical axis alignment becomes a particular problem. The 3n circuit configuration of the terminal space transmission unit of this embodiment is shown in FIG. 4. In this embodiment, when receiving the test signal shown in FIG. 3(b), the to make the sounding body 18 sound to let you know whether the optical axis is currently on.
As shown in the figure, instead of the gain adjustment circuit 12 and signal processing circuit 13 of the first embodiment, a test signal generation circuit 14 that generates the test signal shown in FIG. 3(b) and a reception level detection circuit 11 are used. According to the output of
lffli sound 11 adjustment circuit 15 and logic conversion circuit 5
A pulse width detection circuit 16 detects that it is the test time based on the pulse width of the output of the pulse width control circuit 1. When the pulse width detection circuit 16 detects that the test time is in progress,
The sound generation control circuit 17 controls the drive of the sound generating body 18 according to the output of the sound generation control circuit 17. Note that the test signal generation circuit 14 outputs a test signal when the test switch SW2 is turned on. In this embodiment, when the test switch SW2 is turned on,
A test signal is output from the test signal generation circuit 14. In the other party's spatial transmission unit that received this test signal, the reception level detection circuit 11 detects the reception level from the output of the reception amplifier 52, and the pulse width detection circuit 16 detects the reception level from the pulse width of the output of the logic circuit 53. Detecting whether the signal is a test signal. In this case, since it is a test signal, the output of the reception level detection circuit 11 adjusted to the phoneme level is the sound 1llll! The output is output from the node circuit 15, and the sound generation control circuit 17 controls the sound generation body 18 according to this output.
sound. In other words, the volume level tells the person adjusting the optical axis whether the direction of the optical axis is good or bad. Therefore, the optical axis interposition can be recognized audibly and easily performed. In the above explanation, the volume of the sound generating body 18 is changed, but the same effect can be obtained by changing the interval between sounds depending on the reception level. Furthermore, since the space transmission unit is operated when optical axis alignment is performed in this way, it is also possible to simultaneously check whether the space transmission unit (20) is operating normally. [Effects of the Invention] As described above, the specified invention includes a light emitting display element that lights up with each output of the interface means when receiving a transmission signal of a wired transmission system and an optical pulse signal of a space transmission system. , when a transmission signal is present in the wired transmission system and when an optical pulse signal is received from the spatial transmission system, the light emitting display element is lit by each output of the interface means, so that the light emitting display element is lit during normal operation. The operating state of the interface means can be displayed on the light-emitting display element, and it can be visually confirmed that the upstream light spatialization unit is operating normally, which has the effect of making it easy to confirm the operation. Further, the related invention further includes a test signal transmitting means for transmitting a test signal that can be distinguished from a normal transmission signal, a receiving level detecting means for detecting the receiving level of the test signal transmitted from the optical space transmission unit on the other side, and Since it is equipped with a sounding body that sounds according to the output of the reception level detection means,
The sounding body that sounds in accordance with the reception level of the test signal makes it possible to audibly recognize whether or not the optical axis is aligned, which has the effect of making it easier to align the optical axis.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the circuit configuration of a space transmission unit according to an embodiment of the specified invention, Fig. 2 is an explanatory diagram of the same operation as above, and Figs. FIG. 4 is a block diagram showing a circuit configuration of a spatial transmission unit according to an embodiment of the related invention, and FIG. 5 is a configuration diagram of a data transmission system. 1 is a space transmission unit for satellite, 3 is a space transmission unit for terminal, 4 is an optical transmission circuit, 5 is an optical reception circuit,
8 is a transmission/reception date control circuit, 11 is a reception level detection circuit, 14 is a test signal generation circuit, 15 is a volume adjustment circuit, 1
6 is a pulse width detection circuit, 18 is a sounding body, LD, LD2
is a light emitting diode! is the transmission line. Agent Patent Attorney Ishi 1) Chief 7th Procedure Amendment M) Spontaneous 1. Indication of the case 1988 Patent Application No. 316868 2. Name of the invention Optical Space Transmission Unit 3. Person making the amendment Relationship to the case Patent Applicant Residence Address: 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Toshio Miyoshi 4 Agent postal code 530 5゜Date of amendment order Number of claims increased by voluntary amendment None Subject of amendment Ming #I

Claims (2)

[Claims] (1) An optical transmission circuit that receives a transmission signal transmitted via a wired transmission system, converts it into an optical pulse signal, and transmits it to the optical space transmission system, and an optical pulse signal that is transmitted via the optical space transmission system. An optical receiving circuit that receives a signal, demodulates it into a transmission signal of the wired transmission system, and sends it to the wired transmission system, and when receiving the transmission signal of the wired transmission system and the optical pulse signal of the spatial transmission system, these optical transmission circuits and In an optical space transmission unit that includes interface means for electrically connecting each receiving circuit to a wired transmission system, and is used in a data transmission system in which a wired transmission system and an optical space transmission system are mixed, transmission signals of the wired transmission system and An optical spatial transmission unit comprising a light emitting display element that lights up with each output of the interface means when receiving an optical pulse signal of a spatial transmission system. (2) An optical transmission circuit that receives transmission signals transmitted via a wired transmission system, converts them into optical pulse signals, and transmits them to the optical space transmission system, and optical pulses transmitted via the optical space transmission system. It consists of an optical receiving circuit that receives a signal, demodulates it into a transmission signal of the wired transmission system, and sends it to the wired transmission system, and an interface means that electrically connects these optical transmitting circuits and optical receiving circuits to the wired transmission system. In an optical space transmission unit used in a data transmission system in which a transmission system and an optical space transmission system are mixed, there is a test signal transmitting means for transmitting a test signal that can be distinguished from a normal transmission signal, and An optical space transmission unit comprising a reception level detection means for detecting the reception level of a transmitted test signal, and a sounding body that sounds in response to the output of the reception level detection means.