JP2788808B2 - Switch position determination system in CATV system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for determining a position of a branching device in a CATV system, and more particularly to a system for determining a position of a branching device used in a CATV system for automatically and automatically determining the position of a tap-off which is a branching device in a CATV system. .

[0002]

2. Description of the Related Art In a conventional tap-off layout design, first, a map input device is used to trace and input a house map and a pillar map of a CATV service area, and the position of roads, houses, and the like is determined.
The figure data of the shape, the placement position, and the placement route are obtained.

[0003] The graphic data is displayed on a display device, and based on the display drawing, a designer considers the function and economy of the CATV transmission line and finds out the optimum tap-off arrangement position by repeating trial and error. It has become.

[0004] Such conventional methods often depend on the experience and skill of the designer, and the results obtained are not always optimal.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to automatically and accurately determine an optimum tap-off position by using a CAD technique. It is another object of the present invention to provide a switch placement position determining system in a CATV system.

[0006]

According to the present invention, there is provided a system for determining a position of a turnout in a CATV system according to the present invention. Subscriber home position data indicating each home position, and further, a means for calculating the sum of the linear formula and the distance from each of the subscriber home positions to the pillar position, for each of the pillar positions. Means for determining a pole position at which the sum is minimized, and determining the pole position as a switchboard arrangement position with respect to the designated number of subscriber homes.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the present invention. The keyboard 1 instructs graphic processing,
The graphic input device 2 is a device for reading graphic data.

The storage unit 3 is a memory for storing graphic data subjected to graphic processing, and the graphic processing unit 4 is a characteristic part of the present invention.
And a comparison determining unit 43.

[0010] The arrangement route determination unit 41 is provided with the graphic input device 2.
Data from the house and pole layouts entered from
A pillar arrangement route is extracted, and a straight line expression on the xy coordinates of the pillar arrangement route is calculated and determined. The pillars are located along the road,
This road can be approximated by a straight line.

The distance calculation unit 42 calculates the distance between each of the designated number of homes that can be branched by one tap-off (for example, described below as four homes) and each of the pillars on the pole route. The sum of the calculated distances is obtained.

The comparison and determination section 43 determines the smallest one of the sums of the distances thus determined, and sets the mounting position corresponding to the minimum as the optimum mounting position.

The automatic drafting machine 5 is for outputting drawings, the display unit 6 is a display device for displaying graphics, and the control device 7 is a CPU for controlling all the above-mentioned parts.

Hereinafter, the operation of the embodiment of the present invention will be described assuming that the pillar arrangement route can be approximated by a straight line using a tap-off of four branches.

First, referring to FIG. 3, on the plane of the absolute coordinates xy, the columns P0 to P3, Q0 to P0 along the column arrangement routes 31, 32 represented by a0 x + b0 y + c0 = 0.
Q3 is arranged.

In this case, assuming a certain subscriber's house from among the subscribers and the position is represented by A (x1, y1), the subscriber passes through the subscriber's house A and follows a postal route 31. The point at which the orthogonal straight line intersects the route 31 is defined as A1 (x3, y
3). If the position of one pillar P1 on the route 31 is (x2, y2), the distance A-A1
, A1-P1 is, A-A1 = | a0 x1 + b0 y1 + c0 | / (a0 2 + b0 2) 1/2 ... (1) A1 -P1 = | b0 (x3 -x2) -a0 (y3 -y2) | / (a0 ² + b0 ²⁾ is ^half ... (2).

All of the columns P0 to Pn on the column arrangement route 31
Similarly, the distance from the subscriber home A is calculated. Further, the distance from the subscriber home A to the pillars Q0 to Qn on the other pillar arrangement routes 32 is calculated.

When the smallest one of these distances is obtained, it can be seen that the shortest distance pole among the poles on the routes 31 and 32 can be specified from the subscriber home A.

The tap-off position of the shortest distance calculated based on the above concept can be determined.

Thus, the operation flow of the embodiment of the present invention as shown in FIG. 2 is obtained. In the graphic input step 21, the subscriber's house position data and the mounting position data are read by the coordinate reading device. When all data of the service target area is obtained, the data is stored in the next step 23.

Next, in the graphic processing step 4, a process of determining an optimum tap-off position is performed. For example, subscriber house position data is read from the house map as shown in FIG. 4 by the graphic input device 2 as position coordinates of each of the subscriber houses A to D.

Further, the straight line formulas of the routes 31 to 33 and the coordinate values of the pole positions P0 to Pn, Q0 to Qn, and R0 to Rn are obtained from the pillar arrangement route diagram shown in FIG. (Step 41).

Here, assuming that the mounting position of the four subscribers A to D branched by one tap-off is the position P1 on the route 31 shown in FIG. The distances from the subscriber homes A to D to P1 are calculated (step 42).

The sum of the calculated distances is calculated, and if the sum is minimized, the position P1 on the route 31 becomes the optimum tap-off position for the four subscriber homes A to D. Whether or not the sum is the minimum is determined by the other mounting position P0
The sum of the distances for .about.Pn is obtained and compared (step 43).

Next, when the designer wants to make a partial correction, the data is corrected using the keyboard 1 and the graphic input device 2 in a data correction step 25.

The data subjected to the graphic processing is displayed in a display step 26.
The drawing is made by the automatic drafting machine 5 in the figure making step 27. Further, the layout data is stored in the layout data storing step 28.

[0027]

According to the present invention, the arrangement position of the tap-off can be automatically and accurately obtained, so that there is an effect that an optimal arrangement design without variation due to human factors can be realized.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a diagram for explaining the principle of the present invention.

FIG. 4 is an example of a house map showing subscriber house positions used in the embodiment of the present invention.

FIG. 5 is a diagram showing each example of a pillar arrangement route and a mounting position used in the embodiment of the present invention.

FIG. 6 is a diagram showing an example of a case of searching for an optimum mounting position based on each data of FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard 2 Graphic input device 3 Storage part 4 Graphic processing part 5 Automatic drafting machine 6 Display part 7 CPU

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Yamagishi 5-37-8 Shiba, Minato-ku, Tokyo Japan Cable Media Engineering Co., Ltd. (56) References Sumitomo Electric No. 127 pages 43-51 Shozo Ueda Others “CAD & CAE system for urban CATV network design” (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 17/50 JICST file (JOIS)

Claims (1)

(57) [Claims] 1. A means for determining a straight line formula for a plumbing route;
The pillar position data indicating the pillar position on the straight line and the subscriber house position data indicating each position of the designated number of subscriber houses, and further the pillar position from the linear formula and the position of the subscriber house. Means for calculating the sum of the distances to each of the pole positions, and determining the pole position at which the sum is the minimum to determine the pole position as the switchboard arrangement position for the designated number of subscriber homes. CAT comprising means for determining
A switch position determination system in a V system.