JPS58164340A - Optical data way system - Google Patents

Abstract

PURPOSE:To eliminate the need for a leased telephone circuit for maintenance, etc., by multiplexing a voice and a data signal through an optical data way. CONSTITUTION:Digital equipments 121-12n such as a computer, data terminals, etc., are equipped to station devices 201-20n looped by the optical data way L. Further, telephone sets 131-13n for maintenance are equipped to the respective station device 201-20n. The station devices 201-20n mutliplex data signals from the equipped digital equipments and voice signals from the telephone sets into light signals, which are sent out to the optical data way L; and the light signals on the optical data way L are branched and demultiplexed into the data signals and voice signals, which are supplied to the digital equipments and telephone sets, respectively.

Description

[Detailed Description of the Invention] [Departure - O's Letter of Appointment] This publication is a series of multiple stages that are recorded in the path of the light meal.
The present invention relates to an optical r-toway system in which data is transmitted by optical signals between nodes (node) 1 and arbitrary stages.

[Technical background of the invention]

This type of optical data way system has a plurality of stages (hereinafter referred to as 8T) as shown in FIG. 1, for example.
111~1no are connected by a common optical transmission line, and each station 11~11. By connecting devices such as computers and terminal power equipment (hereinafter referred to as D) 121 to JJ (multiple devices may be connected to the BT) to the ST, during data transmission between the BTs, K is designed to perform data exchange between 0 and 0 at high speed. Such optical dataway systems are often implemented as in-house data networks (within a company), and have traditionally been used exclusively for the purpose of improving workability during system upgrades, periodic inspections, maintenance, etc. Telephone line network is separated from data network by 8 each.
It can be set in units of blocks. That is, as shown in Fig. 1, a dedicated telephone a
/ was installed. This], 1 each? JJ1-11.
Telephones (hereinafter referred to as TL) installed in 1j1~
JJ, nine calls were made over a dedicated telephone line,
Instructions for in-work IF can be given efficiently.

[Problems with background technology]

In this way, in the conventional O optical dataway system, when each stage and O installation position are relatively far apart, system upgrades, periodic inspections, maintenance, etc. (each stage,
The dedicated telephone line network has been softened and optical transmission lines have been installed to allow for efficient communication of work numbers and work progress information to workers stationed at the site or between workers. Since a dedicated telephone line is installed separately, the system has the disadvantage of being expensive.

[From 11iDIiii] This issue was made in view of the above circumstances, and from SooB,
By using multiple dedicated telephone networks connecting each stage and node, it is no longer necessary to install a dedicated telephone line for voice transmission, which significantly reduces system complexity. K provides an optical data way system.

[Summary of the invention]

The stages constituting the optical dataway system include an audio/electrical converter that converts one audio into a low frequency audio signal from which high frequency components have been removed, and a low frequency audio signal that is converted and output from the audio/electrical converter. A transmitting circuit is provided, which includes means for supplying at least nine modulated signals according to the output data signal to a rounded electric/optical converter that outputs the optical signal to the optical transmission line, and transmits the audio component to the optical transmission line. It is designed to send out an optical signal containing the

[Examples of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Note that the same parts as in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. Figure 111 shows the system configuration of the optical data way system, and 7171 to 201 are BT (
6 on the stage (n). aTJ), ~J#nK, TL131-13n are ***1 and gTJO, respectively.

~10. has the function of transmitting the audio signal input from the corresponding T via the optical transmission path, extracting the audio signal from the optical signal sent via the optical transmission path, and transmitting this audio signal to the corresponding T. It has the function of outputting to I.

Next KI? J#l ~10. The above-mentioned −0 function of
This figure shows the configuration of a transmitting circuit that has 11Ca common to each I3md I T J O , ~J o , and IIC (which may be provided at any arbitrary 8T depth).

In the figure, 3- is a 5 electric/optical converter, for example, a LED diode (hereinafter referred to as LD). 31 is a bias current l for driving LDJO.

2.Bias current supply ■J1 has a transistor 311, and the collector current flowing in response to the pace potential (pace current) K of this transistor 1110 is converted into a pie-ame current! , as LDJO
supply to.

Sl is the bias control path. Bias control circuit JJ
is an O optical/electrical changer *@ to monitor the previous output of LDJO.
, for example, a PIN diode (hereinafter referred to as PIND).

)321. The bias control circuit 32 is FIN
D It has a configuration of 5.

33 is low frequency audio No. 1 B from which high frequency components have been removed.
This is an audio/electrical converter that converts into

A low nonus filter (hereinafter referred to as L) that removes high frequency components of
(referred to as PF) 332. Voice conversion circuit 3
31 is 'l'LJ even if it contains TLJJl~13nK
It may be partially divided and included in jl~13° and BT201~20°. 34 is an adder circuit. The adder circuit has an amplifier 341 for adding the J4Fi signal, and performs all additions of the reference bias signal A output from the bias control circuit 32 and the low frequency audio signal B output from the audio/electrical converter 33. The summed output of the summation circuit 34 is supplied to the transistor 3110 pace within the 1+Iass current supply circuit 31.

This is a 35Fi output data signal generation circuit. The output data signal generation circuit 3j outputs an output data signal of a predetermined signal level based on the output data which is serial binary data, and its level inverted signal tube, and includes a scrambling circuit 35, a Norbel conversion circuit 352, and a well-known circuit. It has a structure. As is well known, the scramble circuit 35 is a circuit for preventing a continuation of a no-signal state. Further, the level conversion circuit ZSZ is a circuit that removes the DC component of the output of the scrambling circuit 351 and outputs an output data signal of a predetermined signal level and its O level inverted value * after iR conversion.

3# is l*OX V-ching transistor 36J.

This is a modulated current supply circuit having six. The modulation current supply circuit 1# supplies/stops the modulation current I to the LDjlO according to the logic state of the output data signal which is also output from the output data signal generation circuit 36.XaZ is the modulation current r
I/AIMO current source.

Figure 1114 shows the configuration of the receiving circuit that is commonly provided in each of the 8th and 20th sections to SOK (it may be provided only in any ST). In the figure, 40 is an electrical/optical converter, such as an avalanche photodiode (hereinafter referred to as A
(referred to as PD) 401. 4
1 is an audio signal extraction circuit. The audio signal extraction circuit 41 includes a metal coil 411 and a low pass filter (LPF) 412 for removing high frequency components of the detection signal output from the optical signal detection section 40 and extracting the audio signal. 42 is a data signal extraction circuit. Data signal extraction circuit 4j#i includes a round capacitor 421 and a low noise amplifier 422 that remove low frequency components of the detection signal output from the optical signal detection section 401 and extract the data signal. 43 is an amplifier that amplifies the audio signal extracted by the audio signal extraction circuit 41, and 44 is an electrical/audio converter. The electrical/audio converter 44 converts the output of the amplifier 41 into audio, and the electrical/audio quality @111'44 is, for example, fLJJl~7.
71, the electric/audio conversion section 44 and the audio conversion circuit 181 may be connected to 8 each.
T1t@~20 If installed in snow, 'rLJ11~1
1. becomes unnecessary. This is because the electrical/audio quality @@44 is ma1-11, such as speakers (similar acid earphones). This is because the audio converter circuit 131 has an audio output mechanism for resonating with the receiver of the receiver, and the audio conversion circuit 131 has an audio output mechanism for resonating with the transmitter of the telephone L111 to 11m, such as a four-screw microphone. .

41 is an AGC (iwtesgIati*Gala) that amplifies the data signal extracted by the data signal extraction circuit 41.
eBtm・l) amplifier, 4- is amplifier 4iK) b peak value detection #Aa path (hereinafter referred to as PM) that detects the peak value (or average value) of the output; 4gt) Vary the r-in according to the detection result, and
The level of the amplified output is controlled to be equal to a predetermined level. 41 is a daisymelization circuit. r4 digitization circuit 4
2 has a known circuit configuration for configuring output data based on the output signal of the ANZO 45. This digitization circuit 47 is generally equipped with a 7'4 scramble circuit (not shown) which operates inversely to the scramble circuit 351, that is, removes the 9--T message newly generated by the scramble circuit 351. Of course.

Next, the operation of one embodiment of the present invention will be explained. In general, LD (
When performing optical transmission using a radar diode), the fifth
As shown in the LD current (I) vs. optical output characteristic in the figure, the reference bias voltage fiI. (This current change is caused by the transistor 361. in the example shown in FIG. 1113.
362 pairs, and the amount of change is expressed as the modulation voltage f
A so-called IM variable hook method is adopted in which the optical signal (ILIM) is transmitted based on the on/off ratio of the optical output. Normally, the current (versus optical output ψ) characteristics of the LD change due to temperature changes, so the optical output of the LDIa is monitored by the bias control circuit 32, and the average value is determined so that the peak value coincides with a predetermined value. The reference bias current "1G" is controlled as follows.

In this embodiment, this reference bias current I, is used. The audio current ■it corresponding to the low-frequency line component OmiO audio signal is superimposed on the signal and is supplied to the LDIa. That is, in this embodiment, I,=I10+l□ is superimposed on the modulation current - as the bias current ■ and is supplied to the LDIa.

A worker at a certain 8T, for example l 'r j *, is working at 8T2.
0 ■ worker (or 8 choj O@ ~ @ T j).

) If you give a K instruction and it is round, you can say the contents of the instruction audibly. Alternatively, it is output directly to the audio alteration circuit ssi. In this case, the voice is converted into an audio signal. The high frequency signal is removed from the audio signal by LPF JJJ.
It is supplied to the adder circuit 114 as the low frequency audio signal 1.

- 10,000, /4 IAS control circuit xxFi, LDset) The optical output is divided into two, and the ΔIAS signal A is applied according to the difference so that the 7 ♂ data value weight or average value matches a predetermined value. Output. ζt) A ear signal is supplied to company A addition path 14. The adder circuit J4 adds the bias signal A and the low frequency audio signal 1 and supplies the added output to the pace of the transistor 311 (in the bias current supply circuit 31). As a result, a current corresponding to the addition output of the addition circuit 34 flows into the collector of the transistor 311. This IC current is the bias current fil, and this bias current! , is LD
Ia. As is clear from the foregoing description, the bias current 6tI is the reference bias current 2 corresponding to the bias signal A. is the sum of the audio signals [I, . . . and O corresponding to the low frequency audio signal B. That is, in this embodiment, as shown in FIG. 6←), the reference bias current 1. . The audio signal fi I corresponding to the K low frequency audio signal 1 is superimposed to produce a good signal (
The electric current fi) is used as the electric current R1 for LDIa. Note that, without using the adder circuit J4, the K
Bias current to LDJ#! ,. , audio electric current RI, , is supplied (same as the current supply circuit S1) 2'
)0 bias current supply circuit may be used.

On the other hand, since it is provided in the 5trO1a transmission circuit (see FIG. 3), it outputs the output data signal generation circuit No. 35 and its level inverted signal.

In the case of ζO, the fact that the output data signal does not become a no-signal state even when there is no output data can be easily understood from the fact that the output data signal RIK scramble circuit j5J is damaged.

Modulated current supply circuit 3-O) The transistor 161゜3#2 turns on and on depending on the logical state of the output data signal output from the output data signal generation circuit si. Depending on the transistor pxgzo on/off; the rectifier #ll is the modulation current! It is supplied to LDIa as one. As a result, LDIa has the above modulated current ! as shown in g s gt. Also, the bias current RI supplied by the bias current supply circuit 11, that is,
Reference bias voltage [1,. Voice current! 1. When a composite current I with ψ5 superimposed current (see Fig. 6 ←) is supplied, it becomes K.

The LD 30 outputs an optical signal having an intensity corresponding to the signal level of the composite current (2). Then, the optical signal output from the LD 30 is sent out to the optical transmission line, and each ST; 10. ~20
transmitted to. Now, it is assumed that the above optical signal is detected by the optical signal detection section 40 in the receiving circuit of the BT-20 (see Figure sI4) and converted into an electrical signal. This electric signal is the resultant current shown in Figure 6)! In other words, the transmitting side LD
It is clear that this corresponds to the nine current signals supplied to j#. Therefore, the electric signal includes a component of the low frequency audio signal (corresponding to the audio current !, . . . ) and a component of the output data signal (corresponding to the modulation current IM). Optical signal detection section 4
The electrical signals detected and output from 0 are supplied to an audio signal extraction circuit 41 and a data signal extraction circuit 42, each having a frequency characteristic (passage region) indicated by symbol AB in FIG. The high frequency component (corresponding to the component of the output data signal) is removed from the electrical signal by the audio signal extraction circuit 41, and a low frequency audio signal is extracted. This audio signal is amplified by an f4I, converted into audio by the electrical/audio converter 44, and output. As a result, 8〒2
The worker at -3 can listen to the nine-call voice sent from the worker at aTJ#l. And 8〒201 worker is B
If a voice response is returned to the operator of T201, the 8th 16. Of course, it is sufficient to transmit audio 1141 from the side. In addition, in this embodiment, the voice transmitted from Russia 201 is sent to other 8 stations JO~zO1 (IT having the 411th receiving circuit) K
Although it is said to be expensive, there is no problem in practical use as it is only necessary for workers who need to talk to each other (between 8R) to talk to each other selectively.

On the other hand, the data signal extraction circuit 4J4c removes the 70 yen (corresponding to the audio 4#O component) from the electrical signal detected and output from the optical signal detection 114-, thereby producing an output data signal. is extracted.

In addition, in the above-mentioned Il[IIA, L is used as an electrical/optical converter.
Although we have described the case where a LED diode (D) is used, for example, a light emitting diode (LED) may also be used. In this case, the current supplied to the light emitting diode according to the output data signal is generally the drive current. Therefore, it is clear that the concept of modulation current described in the claims includes the above drive current. In addition, in the above embodiment, a case was explained in which an APD (Alancier photodiode) 401 was used as an optical/electrical converter in the receiving circuit.
An IN diode or the like may also be used.

〔Effect of the invention〕

As detailed above, according to the unfired VSO optical dataway system, it is possible to use multiplexed dedicated communication networks connecting each stage and stage, so there is no need to install dedicated communication lines for voice transmission, and the system is easy to use. Therefore, the system price can be significantly reduced.

[Brief explanation of drawings]

Figure 111 is a system configuration diagram showing a conventional example, No. 2 is a system configuration diagram showing an embodiment of the present invention, Figure 113 is a configuration diagram of the message transmitting circuit in the above embodiment, and No. 4 #A is a diagram of the receiving circuit. Configuration diagram, #5! J is a diagram sms showing the operating thick layer of optical output
Figures (a) to f are rounded signal Wl diagrams to explain the operation.
FIG. 7 is a band separation diagram showing the frequency WJL number characteristic of the receiving circuit. ... LED diode (LD, electrical/optical converter), 3
1... Bias current supply circuit, JJ-... Bias control circuit, JJ-... Audio/electric conversion section, 34... Addition circuit, j#-- Modulation current supply circuit, 401... Avalanche, . Photodiode (PD, optical/electrical converter),
41-Audio signal extraction circuit, 42--Data signal extraction circuit, 44--Electrical/audio converter, 4r--Digitization circuit, L--Optical transmission line, L--Dedicated telephone-0 To the applicant's agent Suzue Takehiko Benshishi Figure 1 Figure 2 Figure 5 Figure 16 □ Figure 7

Claims (4)

[Claims] (1) In a multiplication dataway system equipped with a plurality of stations connected to an optical transmission line, an electrical/optical converter is used to output an optical signal to the optical transmission line, and an electric/optical converter is used to output an optical signal to the optical transmission line, and a Audio to convert into frequency audio signal/
A transmitter comprising: an electrical converter; and means for superimposing the low frequency audio signal converted and output from the audio/electrical converter on a modulated signal according to at least an output data signal and supplying the superimposed signal to the electrical/optical converter. □An optical dataway system characterized in that a circuit is provided in the above-mentioned stages. (2) The stage includes an optical/electrical converter that converts the optical signal on the optical transmission path into an electrical signal, and removes the low S* component of the electrical signal converted and output from the optical/electrical converter. 4111 is equipped with a data reproducing section for reproducing data, and an audio reproducing section for reproducing audio by removing high frequency components of the electrical signal converted and output from the optical/electrical converter. An optical data way system according to claim 1. (3) Claim 111(119) is the data way system according to claim 2, wherein the electrical/optical converter is a LED diode. (4) A means for detecting a Kutsuji average value of the optical signal O9- value outputted from the radar diode and comparing it with a reference value to output a reference bias current for the radar diode; The reference bias current is outputted by means and is configured to be superimposed on the low frequency audio signal and applied to the radar diode. dataway system.