JPH0223312A - Method and switch for route switching - Google Patents

Abstract

PURPOSE:To form a by-pass route speedily at the time of trouble occurrence by connecting the negative-side terminal of a main line at a switching position and one of two terminals of a 1st loop line, and the other-side terminal and one of two terminals of a 2nd loop line respectively. CONSTITUTION:The negative-side terminal 12a of the main line 12 at the switching position and one of two terminals 13a and 13b of the 1st loop line 13, and the other terminal 12b and one of two terminals 14a and 14b of the 2nd loop line 14 are connected. Thus, the terminals are connected to form a by-pass route from the 1st loop line 13 to a trouble point of the main line 12 through a switching node 15 and a by-pass route from a station 11 to the main line 12 through the 2nd loop line 14 and switching node 15. Consequently, a break of communication at the time of the trouble occurrence can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a route switching method applied to a communication system using optical fibers and a route switching device used therefor.

(Prior Art and Problems to be Solved by the Invention) Recent optical communication systems, for example, as shown in FIG.
... is strung out, and optical cables 2.2°, 2
The optical fiber i< in ゛ is set to be withdrawn sequentially at each subscriber station.

By the way, in such an optical communication system, for example, if a failure occurs at the point marked with an X on the optical cable 2,
Joining stations closer to station 1 than this failure point are not affected, but
There is a problem in that communication with subscriber stations located far from the point of failure as seen from station 1 is interrupted. In order to deal with such a situation, each optical cable 2.2'', 2''...
A loop line is installed across each optical cable 2.
It has been proposed that a switching device be provided at the intersection of 2', 2'", . . . to form a detour route when the above failure occurs.

However, at present, the route switching method used for this detour route and the specific configuration of the optical switch used therefor are not known, and the development thereof is desired.

The present invention has been made in view of such conventional demands, and an object of the present invention is to provide a route switching method and a switching device used therein that can quickly form a detour route when a failure occurs in an optical communication system. do.

(Means for Solving the Problems) In order to solve the above problems, according to the first invention, the connection state between the main line and the first and second loop lines connected to this main line at the time of switching is switched. In the route switching method, one side terminal of the main line at the switching position and the first
The configuration is such that one of the two terminals of the loop wire, and the other terminal of the main wire at the switching position are connected to one of the two terminals of the second loop wire. Further, according to the second aspect of the present invention, the first block in which the negative side terminals of the main line, the first and the second loop lines at the switching position are arranged and fixed at equal intervals; and a second block in which terminals on the other side of the second loop wire are arranged and fixed at equal intervals, and the fitting pin is inserted into the long hole for the fitting pin formed in each of these two blocks. The first block and the second block are integrated, and when switching, the first and second blocks are relatively moved by one interval between the terminals.

(Function) At the time of switching, each loop is Form a detour route from the line to the main line. Also, a first block in which terminals on one side of the main line, first and second loop lines are arranged and fixed, and a second block in which terminals on the other side of the main line, first and second loop lines are arranged and fixed. 1, the main line, the 1st loop line, and the 2nd loop line are connected to each other by a switching device which is integrated with a mating pin, and when switching, both blocks are moved relative to each other by one interval, and the main line is A detour route is formed by connecting the side terminal and the loop wire.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIGS. 1 and 2 show a first embodiment of the route switching method according to the first invention, and show a case where signals flow in the same direction through the first and second loop lines, respectively. That is, in FIG. 1, the main line 12 is connected to the station 11, and at the same time, the first and second loops vA13 and 14 are connected. The loop lines 13, 14 intersect the main line 12, and a switching node 15 is arranged at the intersection. Figure 2 (a
) shows the connection state at the switching node 15 shown in FIG.
3a and the other side terminal 13b1 The one side terminal 14a and the other side terminal 14b of the second loop wire 14 are connected, respectively.

In FIG. 1, if a failure occurs at the point indicated by the cross on the main line 12, the switching node 15 is switched as shown in FIG. 2(b) to form a detour route. That is, Fig. 2 (
In b), one side terminal 12a of the main line 12 and one side terminal 13a of the first loop line 13 are connected, and the other side terminal 12b of the main line 12 and one side terminal 14a of the second loop line 14 are connected, respectively.

By establishing such a connection state, as shown by the arrows in FIG. Detour routes are formed to reach the main line 12 via the second loop line 14 and the switching node 15, thereby preventing communication interruption in the event of a failure.

FIGS. 3 and 4 show a second embodiment of the route switching method according to the first invention, and show a case where signals flow from different directions to the first and second loop lines, respectively. Note that the same components as in FIGS. 1 and 2 are denoted by the same reference numerals. That is, in FIG. 3, the main line 12 is connected to the station 11.
are connected, the first and second loop wires 13,
and 14 are connected. The loop lines 13, 14 intersect the main line 12, and a switching node 15 is arranged at the intersection. FIG. 4(a) shows the connection state at the switching node 15 shown in FIG. The side terminal 13a and the other side terminal 13b, and the one side terminal 14a and the other side terminal 14b of the second loop wire 14 are connected, respectively.

In FIG. 3, if a failure occurs at a point indicated by an X on the main line 12, a detour route is formed by switching the switching node 15 as shown in FIG. 4(b). That is, in FIG. 4(b), one side terminal 12a of the main line 12, the other side terminal 13b of the first loop line 13, and the other side terminal 12b of the main line 12
and one side terminal 14a of the second loop wire 14 are connected, respectively. By establishing such a connection state, as shown by the arrow in FIG.
A detour route is formed from the station 11 to the main line 12 via the second loop line 14 and the switching node 15', thereby preventing communication interruption in the event of a failure.

5 to 7 show embodiments of the switching device according to the second invention, - as an example, the switching node 15 shown in FIG.
The figure shows the switch used for

That is, in FIG. 5, the switch 20 is composed of blocks 21 and 22, and the block 21 has four optical nore bars corresponding to the main line and each loop line so that the end faces are exposed at equal intervals on one side of the block 21. is placed and fixed. Similarly, optical fibers corresponding to the main line and each loop line are arranged and fixed on one side of the block 22 so that their end faces are exposed at the same intervals as those of the block 21. Further, on both sides of each block 21.22, long holes 21a, 21b, 22a for fitting pins are provided in the longitudinal direction of the optical fiber.

22b are formed respectively. In addition, the long hole 21 for the fitting pin
a, 21b, 22a, 22b, each long sleeve is the main line 12
, and are formed so as to be arranged in the same direction as the arrangement direction of each optical fiber of the loop wires 13 and 14.

FIG. 6 is a plan view showing the details of this switch 20. In FIG. 6(a), the block 21 has one side terminal (bare fiber (the same applies hereinafter) 14a, one side terminal 1 of the main line 12
2a1 The other side terminals 13b of the first loop wire 13 are arranged horizontally at equal intervals in this order, and the one side terminals 13a of the first loop wire 13 are arranged in the corresponding block 22 from the right side toward the joint end surface. , the other side terminal 12b of the main line 12, and the other side terminal 14b of the second loop line 14 are arranged horizontally in this order at the same intervals as the block 21.
By bringing the end faces of and 22 into close contact as shown in the figure,
The main line 12 and the loop lines 13 and 14 are in a continuous state.

The long hole 21a of the block 21 and the block 22
The long hole 22a1 of the block 21 and the long hole 21b of the block 2
The two elongated holes 22b communicate with each other at the block joint surface, and fitting pins 23.24 are inserted into these elongated holes to integrate both blocks 21.22. These long holes 21a, 21b.

The width (major axis diameter) of 22a and 22b is set to a value that is the sum of the diameter of the fitting pin 23, 24 and the distance between the end faces of each optical fiber.

At the time of switching, as shown in FIG. 6(b), the block 22
, the elongated hole 22a of the fitting pin 23, 24 on the plink 22 side.
, 22b are inserted into the elongated holes 22a, 22, respectively.
Move it in the direction of the circular arrow until it touches the side wall of b. As a result, the one side terminal 14a of the second loop line 14 and the other side terminal 12b of the main line 12 are connected, and the one side terminal 13a of the first loop line 13 and the one side terminal 12a of the main line 12 are connected, respectively. Thus, a detour route as described above is formed.

Fig. 7 shows an example of wiring for realizing the connection state shown in Fig. 2(a), and in the figure, the same components as in Fig. 6 are denoted by the same reference numerals. be.

Although the above embodiment describes a switch for a single optical fiber, the switch is not limited to this.
For example, as shown in FIG. 8, multi-core tape optical fibers 31 are arranged in upper, middle, and lower three stages, and long holes 30a, 3 for fitting pins are arranged.
By using a pair of blocks 30 (only one block is shown) that are integrated by a fitting pin (not shown) inserted into It becomes possible to switch between a large number of sets of optical fibers, and it can also be applied to multi-core tape optical fibers.

(Effects of the Invention) As explained above, according to the first invention, in the route switching method for switching the connection state between the main line and the first and second loop lines connected to the main line at the time of switching, one of the terminals on one side of the main line and the two terminals of the first loop line at the position, and the terminal on the other side of the main line and either of the two terminals of the second loop line at the switching position. Since the configuration is such that the two loop wires are connected to each other, regardless of whether the signal directions of the two loop wires are the same or not,
It will be possible to form a detour route when a failure occurs on the main line.

Furthermore, according to the second invention, the main line at the switching position,
A first block in which one side terminals of the first and second loop lines are arranged and fixed at equal intervals, a main line at the switching position, and a first
and a second block in which terminals on the other side of the second loop wire are arranged and fixed at equal intervals, and the two blocks are integrated by inserting the fitting pin into the long hole for the fitting pin formed in each of these two blocks. , and at the time of switching, the first and second blocks are moved relative to each other by one interval of each terminal,
This method has the advantage that route switching can be performed with a simple configuration, and that it can be applied not only to single-core optical fibers but also to multi-core optical fibers.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing a first embodiment of the route switching method of the present invention, FIG. 2 is a diagram for explaining the switching state of the switching node in FIG. 1, and FIG. A wiring diagram showing a second embodiment of the route switching method of the present invention, FIG. 4 is a diagram for explaining the switching state of the switching node in FIG. 3, and FIGS. One embodiment of the switching device of the invention is shown, FIG. 5 is a perspective view of the switching device, FIG. 6 is a plan view of the switching device, FIG. 7 is a wiring diagram of the switching device, and FIG. 8 is a switching device of the present invention. FIG. 9 is a conceptual diagram showing a conventional optical communication system. 11... Station, 12... Main line, 13.14... Loop line, 12a, 12b, 13a, 13b, 14a, 14
b...Terminal, 15.15°...Switching node, 20
Phase switcher, 21.22.30--block, 21a,
21b, 22a, 22b, 30a, 30b--Elongated hole for fitting pin, 23.24... Fitting pin. Figure 1 Figure 2 (Q) (b)

Claims (2)

[Claims] (1) Main line and the first line connected to this main line when switching
and a route switching method for switching the connection state with the second loop line, one of the terminals on one side of the main line at the switching position and the two terminals of the first loop line, and the other side of the main line at the switching position. A route switching method characterized by connecting a terminal and either one of two terminals of the second loop line. (2) A first block in which terminals on one side of the main line, first and second loop lines are arranged and fixed at equal intervals in the switching position, and on the other side of the main line, first and second loop lines in the switching position It consists of a second block in which terminals are arranged and fixed at equal intervals, and the fitting pins are inserted into long holes for fitting pins formed in these two blocks to integrate them, and when switching, the first and second blocks are integrated. A route switching device characterized in that the blocks of No. 2 are relatively moved by one interval between the respective terminals.