JPS62117494A - Optical exchange system - Google Patents

Abstract

PURPOSE:To remove an invalid communication by inputting a receipt enable display signal light as well as a communication data signal light to respective communication paths and monitoring both the signal lights. CONSTITUTION:Respective terminals have means B1-B4 for outputting a display signal indicating whether the receipt can be performed or not and means M1-M4 for monitoring the communication data signal lights I1-I4 and the receipt enable display signal lights B1-B4 by using the branching function of a communicating optical switch. The respective terminals T1-T4, in the case of being idle, namely, the receipt enable, transmits the direct current light of a constant level to the idle and busy state display outputs B1-B4. On the other hand, when information is received from the busy, or other terminal, or when the optical exchange of the present invention is used for the communication between processors, if a certain terminal is occupied since it uses the processor, the terminal does not output to the corresponding idle and busy state display outputs (B1, B2, B3 or B4).

Description

[Detailed Description of the Invention] [Required] An optical switch having three states of "open", "closed" and "branched" is arranged in a lattice consisting of N rows and N columns. In an optical switching system, the transmission of a signal light indicating that a terminal is ready to receive a call and the state of the other party's terminal are monitored, and invalid communication is eliminated by knowing the state of the other party's terminal in advance.

[Industrial application field]

The present invention provides LAN, multiprocessor communication, exchange 1
The present invention relates to optical switching systems used in FFI channels, etc., and particularly relates to improvements in optical switching systems that enable complete distributed control at terminals and eliminate invalid communication.

In conventional optical switching equipment, it was possible for each terminal to identify whether the other terminal was busy or not, but for example, when used for multi-channel communication between 1':1 processors, it was possible to identify whether the other terminal was busy or not. It was not possible to know in advance if the other party's terminal was occupied and the call could not be received.

For this reason, there is a possibility that ineffective oil immersion may occur, and there has been a demand for the development of a means to eliminate this.

[Conventional technology]

In a conventional switchboard, the optical information on optical fibers is converted into electrical signals, then the electrical signals are exchanged, and the exchanged electrical signals are converted back into optical information and transmitted.
It was common. For this reason, there has been a problem in that the characteristics of optical transmission, such as broadband, high speed, and resistance to external noise, are impaired in the exchange.

In addition, there is an optical/electrical converter (hereinafter referred to as 0/
Since it requires an electrical/optical converter (hereinafter referred to as E10 converter) that converts the electrical signal after exchange into light (hereinafter referred to as E10 converter), the problem is that the equipment is large and expensive. There was also.

Furthermore, since the switching equipment was centrally controlled by a central processing unit, there was also the problem that switching control was complicated.

To solve this problem, Honkawa 1! Ji'i A,t
; Item II') September 2211 Application No. 1, Y Application No. 5
11-17, 101i0 issue ('1.'i-Kaiaki (10-
No. 66596), as shown in Figure 2, ◇;

In Figure 2, there are four +, :j
j not T1 ~ 1゛4 are connected by optical fiber -(
There is.

The following explanation will be given using an example in which these four terminals are accommodated.
The invention is not limited to this number of terminal connections.

The optical exchange 50EX includes a communication grid CL consisting of four rows C1 to C and four columns I to R, and a detection grid 1) L consisting of a row C5 and one column R5.
A multiplex counter M, an optical splitter (hereinafter referred to as a divider) IV, and a demultiplexer (I) M+, , DM are included.

At the intersection of each row and each column of the 1ffi credit rating I'CI, optical switches S, , l, S, , U, P, S+, 4 having an optical branching function are arranged.

Detection grating 1) L is a detection grating inch Sj having a light beam m1lQ capability arranged at the intersection of the fifth row C and each column.
, ,Sk,x,Sr,j,Sr,+, and the fifth column R,
and a detection optical switch S, 14.5211, Ss, r-S4. having an optical branching function arranged at the intersection of each row. It is equipped with r.

The detection grating T:1L is further provided with a dummy optical switch for inserting a start signal and a stop signal, which will be described later, on the fifth row CI.

FIG. 3 is a diagram showing the structure of a waveguide type optical switch as an example of a device used in the invention.

Waveguide optical switches are well known, for example LiN
A substrate type upper wave path 2 is formed on the bO3 substrate I by Ti diffusion. By changing the driving voltage ■, the input line #
A waveguide is formed between the output lines #1 and #2 and the output lines #1 and #2.

FIG. 4 shows a state diagram of the era switch. By the driving voltage V applied to the optical switch, as shown in FIG.
In the "open" state, in other words, incoming line #1 is connected only to outgoing line #1, and incoming line #2 is connected only to outgoing line #2.

In the figure (h) when V-V is in the "branch 1" state, that is, incoming line #1 is connected to outgoing line #1 and outgoing line #2.

Figure (c) When V = V,', "min + II
i2'' state, that is, incoming line #2 is connected to outgoing line #1 and then to outgoing line #24.

Figure (d) When V=V, “closed” state, that is, input line #
1 is connected to outgoing line #2, and incoming line #2 is connected to outgoing line #I.

Note that the "closed" state in (d) above is defined in the invention (Japanese Patent Application No. 1983-
174080), but it is used in the present invention, which will be described later.

Demultiplexer DM,'(i-1,2,3'(,
Or 4) is the multiplex switch control signal +Tj (i.e. switch drive voltage [') from the terminal '1'i, as shown in FIG.
It is distributed and added to each control input of i, st, S, Si, and 4.

In the example shown in FIG.
The control signal output from the optical switch Si,1 is set to “
Branch 1” state is reached and optical information is distributed to column I 111A.
L, other optical switch S7. l, Si, j and Sj, 4
It is in the "open" state at L and l, and only in the force direction of row Cj)
Let jWI pass the v4 favor.

The multiplex switch control signal from terminal Tj includes the fifth [R
1, a start signal ST and a stop signal S
1) are added to each.

As shown in FIG. 6, the multiplex counter M sequentially detects the detection optical switches S, .
r, , Sr, s, 57Al to "branch 2" mode, and detection optical switch S5. ri, Ss, x,, 5tt-
S4. Control r to "branch 1" mode.

In FIG. 6, for example, when optical information is sent to column R4, the detection optical switch S! , now is set to "branch 2"mode; the light information that has passed through column R now is placed in row C. 1. ζ branched, C! The column Rr-1 connected in series with inn
'l, input to the divider DIV.

On the other hand, if the optical information just sent to n11 R is, for example, the terminal T
, the detection optical switch S,
, k is set to "branch 1" mode, optical information is branched to Rr-h and sent to the divider.

The divider I')lV equally distributes the input optical information +U sequence as described above, for example, and returns it to each terminal.

That is, the output 1)i, which is a series of row and column information of the divider I)IV, indicates that the communication grid is "open" or "branch 1" (
or "minute + l + 12") state 4 shows U7 and the output F) i is manually input to the terminal T,' V), :'l1ii 1゛i is the desired destination terminal '1' (Here, with special (5, - not specified)) It is determined whether the m communication is +jl function or not.

The multiplex switch M also controls the dummy optical switch Sr, within the predetermined period, to form a "branch 2'", and from C, 2, FIG. As shown in , columns r < i to I'< 4 and rows 01 to C do not indicate the current usage status, and a start signal ST is placed before and after the information column.
and a stop signal SP are added.

Specifically, for example, the light emitting element that constantly outputs light is connected to the S section, and the light switch ST and o are set to "branch 2 mode 1".

Star Tobisoto vs. 1+r;-4' in the evening and early evening, S, 1. If you shift the lens to "open", the fourth section of the terminal receiver will be able to detect the change in light output from continuous light output as the starting focus. After a predetermined number of times has elapsed since the start bit, Sr. Set o to “minute ibQ 'l” mode F,)
Send V- continuously.

For example, terminal T. - is the other party's terminal T7 (J - ]
, 2, 3, or 4), divider I)
If it is determined from the output 1'17 from IV that the other terminal Ti is not busy, the terminal Tj controls the demultiplexer DM,: to change the state of the optical switch S=,i from the "open" mode to the 6-branch 1" By changing the mode, the optical information from the terminal Tj is branched by the optical switch Sj, and passes through the column Ri to become the output Oi of the communication grid and input to the other terminal Ti.

The optical information from the opposite terminal 'I''i is transmitted by Ti to the terminal Tj via the optical switch 37,zo by setting the optical switch S,°.; in the "branch 1" mode by the demultiplexer DMi.
is input. In this way, a communication path between terminals is established.

(The problem that the invention seeks to solve)However,
- With the distributed control method described above, for example, when used for multiprocessor communication, it is not possible to know in advance that the other terminal is busy using the iB processor and cannot receive a call. Invalid communication due to incident 7
There was a problem that there was a possibility that 1~.

[Means for solving problems]

The problem described in Section 1-1 is in an optical switch with an optical I111 signal path in which optical switches with three states, ``open,''``closed,'' and ``minutes'' are arranged in a lattice consisting of N rows and N columns. , a means for inputting the incoming call 11 (front signal) V of each terminal from each terminal connected to this communication path to each illumination signal path in addition to the communication data signal Gekko; This problem is solved by the present invention, in which each terminal is equipped with a branching function to monitor the incoming data signal light and the incoming K11T display signal light.

[Effect]

By equipping each terminal with a means for inputting a call-ready indicating signal light from each terminal to each communication path, and a means for monitoring the communication data signal light and call-ready indicating signal light by means of the branching function of an optical switch in each terminal, each terminal can achieve Check whether the other party's terminal is busy or not, and even if it is not busy, for example, when using it for communication between multiple processors, if the other party's terminal is using the processor alone, the phase T', It can autonomously determine if the terminal is busy and cannot receive calls, so it can eliminate invalid communications.

〔Example〕

Hereinafter, the gist of the present invention will be explained in detail with reference to the embodiment shown in FIG.
Explain. The same symbols throughout the figures indicate the same objects.

In FIG. 1, the optical exchange ogxf indicated by the chain line has 4 (
1^1 terminals Tl to T+ are connected by optical fibers. Although an example in which these four terminals are accommodated will be explained below, the present invention is not limited to this number of terminals connected.

Thu) V'; Exchange oExf is 4 lines 01 to C now and 4
It is provided with a communication grid CL consisting of columns R1 to R, and a switch driving device 1) 1) to DV. This is the same as the above-mentioned Japanese Patent Application No. 174080/1980.

The present invention is directed to the above-mentioned patent application No. 511-174i1110,
In the present invention, the point number 11, 1.1 does not have "(C3[detection bar[)11, maroop fp1 nox counter M, and divider I]IV".

and instead &) outputs a display signal to each terminal indicating whether the call can be received or not -114 and i
ll Ia j III >'+1 former data transmission using the branch function of the tr switch'))'C11~I now and arrival (1
The means for monitoring the II display signals 131 to 13 is provided.

First, if 1llll (, -X is not performed between any terminals, all switches S1, 1 to S4.
Switch drive device connected to 5jij bundle '1''1 to T+ 1) Vl to 1) ■ Set to "open" state by +.

If each terminal Tl-T+ is "empty" or can receive a call, it sends out a DC light with an empty/busy state display output Ill-a46, knee, and fixed bell.

Conversely, when a terminal is receiving information from another terminal immediately or when the optical switch is used for communication between Broseno and Suma, the terminal is using the V1 processor alone and When the terminal is occupied, the terminal outputs nothing to the empty state display output (B, , B, , T (3, or B now) for pair 1, 1-1.

- As an example, a case will be explained in which the terminal T sends information to the terminal T.

,) jjj end゛1゛yu first switch 8□2 now, D
V u causes the “open” state to the “branch” state (hereinafter the fourth
The states of "branch 1" and "branch 2" in the figure are both set to "branched ILu" and the monitor MS is monitored.

(1) If nothing is detected on monitor M2, the terminal] 'The current 13D output is not outputting anything, and the terminal'
I' For example, the processor cannot be received because the processor is being used alone, or the terminal has a lower priority than terminal T, that is, it is an older terminal (
In this case, Ts) is already communicating with terminal Ts, so we will try again later.

(2) When the modulated light is detected on monitor MJ, a terminal with a higher priority than terminal 'I''2, that is, a terminal with a lower number (terminal Tl in this case) is already communicating with terminal Tl, so it will be sent later. Try m.

In either case of ratio (2), the switch S1. is returned to the "open" state.

(3) If unmodulated light is detected on monitor M2, it is because the countercurrent output light from the other terminal has been detected, and the terminal ``+'4 is an incoming call 11■, so the optical switch S... Sets the current state from the "branch" state to the "closed state" and outputs information 1. In order to avoid collision when two or more terminals access the same terminal at the same time, the monitor is monitored by sending an idle pattern such as an alternating signal of "0" and "1'."

(a) Detects the light modulated by monitor M; (if it is -7, it means that there is a conflict with a terminal with a higher priority than itself (TI in this case), so switch S2 and 4 is set to the "attack state". , and completely stop sending out idle patterns 1 (7, retry later.

(l]) Otherwise, the jm with the companion terminal'l゛now
Now that trust has been established, data is sent. After sending the data, return the Kichi switch to the "open" position.

The terminal on the receiving side ('1 in this case) modulates information other than the incoming call re-information issued by the DC destination in the information input) V4, that is, the incoming call from the other party's terminal (in this case '+゛2) When this is detected, the transmission of the incoming call information 10 is stopped.

In order to facilitate the detection, i.e., to facilitate the discrimination between the output data and the incoming 6.
Does the no-signal level continue, such as with MI codes? Use 1 inch.

In this way, according to this embodiment, each terminal autonomously
Ill communication can be controlled, and Zuroko J- can be done without invalid communication.

Furthermore, unlike the optical invention (Japanese Patent Application No. 5,847,4080), it does not have a dedicated detection grating, so it is advantageous in terms of the number of optical switches and insertion loss.

〔Effect of the invention〕

As explained above, in the optical switching system according to the present invention,
1 for the earlier invention of optical switching equipment (Japanese Patent Application No. 58474080)
1-Be, each terminal sends an incoming call indication signal to the communication channel,
Monitoring this has the effect of eliminating invalid communications.

4. Explanation of the node fit in Figure 10T Figure 1 shows the light and horizontal machine circuits A and Z according to the embodiment of the present invention, and Figure 2 shows the 119 control nodes 1-2 of the 4L bundle example. , FIG. 3 is a structural diagram of an example waveguide type optical switch used in the present invention C1, and FIG. FIG. 2 is a diagram for explaining a view of the operation state f1.

FIG. 5 shows an example of the demultiplexer DMi in FIG.
6171 is a diagram for explaining the control of the optical switch of the detection case Y by the multiplex counter M in FIG. 2 of the example. .

or=x,,rBi:X! is an optical switch, C1 is a communication grid, D L is a detection grid, DMI ~1) M4 is a Dan Luna Brekna, M is a Maru f Prekska 1 linter, DIV is a divider, [], ~I] is now a divider output , ■１ ～■Now is love! Output, 01 -0 Now input information, Sl, +, S14, ~, s4. Now, the communication optical switch, Sr, 11St, as Sr, a, Sr, + and S,..., Sa, j, Sj, *, S4, ri is the detection optical switch, "Fl -T+ is the terminal, I) Vl -DV now switch voltage driver, F3.
-B now shows the vacancy state display signal output, Ml to M now shows the monitor signal.

;　　　　　　　　　　　　　4 Soyin ~

Claims (1)

[Claims] In an optical exchange having an optical communication path in which optical switches each having three states of "open", "closed", and "branch" are arranged in a lattice consisting of N rows and N columns, the communication path From each terminal connected to one end of each row,
In addition to the communication data signal light, the communication data signal light and the call availability display signal light are transmitted to each terminal by means of inputting the call availability indicating signal light of each terminal into each communication path, and by using the branching state of the optical switch at each terminal. An optical switching system characterized in that each terminal is equipped with a monitoring means so that each terminal can autonomously determine whether other terminals can receive calls.