JP4665057B1 - Optical drop cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical drop cable and a laying method thereof capable of reliably and quickly performing a pulling operation at a site where a plurality of optical drop cables are arranged side by side and managing an optical drop cable after laying. To do.
An optical drop cable (1) includes a support line part (10) mainly composed of a support line (11) protected by a covering member (12) and a cable part (20) connected to the support line part (10). The cable portion 20 includes a first optical fiber unit 30 that incorporates a first tension member 31 and a first optical fiber core wire 32 and is integrated with the lower portion of the support wire portion 10 via a connection portion 51. And a second optical fiber unit 40 that incorporates a second optical fiber core wire 41 and a second tension member 42 and is separable and integrated with the first optical fiber unit 30. On the outer surface of the covering member 12, a unique identification mark 13 including the year of manufacture, the length from the end, and the serial number is provided.
[Selection] Figure 1

Description

TECHNICAL FIELD The present invention relates to an optical drop cable , and more particularly, an optical drop capable of reliably and quickly carrying out lead-in wiring to an office, a general subscriber's house, etc. by branching an optical fiber via a connection material such as a closure. Regarding cables .

  In recent years, FTTH (Fiber To The Home) has rapidly spread, and an optical drop cable is used for drawing an optical fiber into a general home. The drawing of the optical drop cable into the house is performed, for example, as shown in FIG. First, utility poles 105A to 105D are erected at predetermined intervals in the vicinity of subscriber homes 101 to 104, and a trunk cable 106 is laid in advance on the utility poles 105A to 105D. A branch closure 107 is installed on the utility pole 105A, and a drop closure 108 is installed on the utility pole 105B. An optical drop cable (or small optical fiber cable) 109 is installed between the branch closure 107 and the drop closure 108, and one end thereof is optically connected to the trunk cable 106 via the branch closure 107. On the other hand, drop cables 110 to 113 (both having one or two optical fibers built in) are connected to the drop closure 108, and the drop cables 110 to 113 are individually drawn into the subscriber houses 101 to 104. ing. A spiral hanger 114 is mounted on the trunk cable 106, and the drop cables 110 to 113 are installed in the spiral hanger 114 in a state along the trunk cable 106.

  It is desirable for a communication contractor to lay the drop cables 110 to 113 quickly and efficiently. As an example, an optical drop cable that drops an optical drop cable to a subscriber's house or the like using an existing 100V lead-in line. A spiral pipe is wound around a holding structure and a withdrawal method (see Patent Document 1) and a DV (power draw-in vinyl wire) laid between the house and the nearest utility pole, and on the utility pole side of this spiral pipe There is known a laying method (see Patent Document 2) in which an optical drop cable is installed by attaching a line drive means and sending the optical drop cable into a helical pipe by compressed air.

  The above-described drop cables 110 to 113 are cases in which each optical fiber has a single core. Therefore, conventionally, one optical drop cable has been drawn from the drop closure 108 for each subscriber house. On the other hand, an optical drop cable having two or more optical fibers has also been proposed. Next, a conventional laying method of an optical drop cable having two optical fibers will be briefly described.

  FIG. 6 shows a conventional laying method using an optical drop cable having two optical fibers. For example, in the conventional optical drop cable 202 disclosed in Patent Document 3, tension members 213a and 213b are arranged outside the two optical fibers 202a and 202b arranged in parallel as shown in FIG. They have a structure in which they are integrally covered with a jacket 211 and a support wire 220 covered with a covering material 221 is arranged on the outer side of the tension member 213b on one side. Further, notches 215 and 215 for taking out the two optical fibers 202a and 202b are formed on the left and right. Then, as shown in FIG. 6A, the core 202a branched from the optical drop cable 202 connected to the trunk cable (not shown) is first drawn down to the subscriber's home 203 via the utility poles 201A and 202B. Next, when a new optical drop cable is to be withdrawn from the subscriber home 204, the core 202b branched from the optical drop cable 202 is transferred to the subscriber home 204 as shown in FIG. Be withdrawn. When a new subscriber (subscriber's house 205) appears, a new optical drop cable 206 having the same structure as the optical drop cable 202 is connected to the utility poles 201A to 201C as shown in FIG. Then, the core 206a of the optical drop cable 206 is pulled down to the subscriber house 205. Then, when the subscriber home 207 appears again and the optical drop cable is pulled down, the core 206b is pulled down to the subscriber home 207 as shown in FIG.

  On the other hand, when there are a large number of users such as high-rise buildings and high-rise condominiums, slot-type optical fiber cables formed by twisting multi-core optical fibers spirally in one direction have been used. The conventional slot-type optical fiber cable has no slack in the spirally twisted optical fiber when the optical fiber core is branched and taken out, so it is difficult to take out the optical fiber core. Had to cut. Therefore, an SZ cable using an SZ twist slot in which optical fiber core wires are alternately twisted has been proposed (Patent Document 4). As shown in FIG. 8, the SZ cable 300 has a slack in the optical fiber core wire 301 to be taken out because the twist direction of the SZ twist slot 305 for guiding the optical fiber core wire 301 is alternately reversed. Therefore, the intermediate branching operation can be greatly simplified.

Japanese Patent Laid-Open No. 2002-148496 JP 2001-251717 A JP 2008-129062 A JP-A-11-133279

  However, in the above-described conventional optical drop cable, the optical fiber core wires are arranged close to each other, and if the optical fiber core wire 202b is branched after the middle, the optical fiber core wire 202a is also exposed. There was a problem that. Therefore, it has been necessary to reconnect the optical fiber core wires 202a and 202b to a single optical fiber cable.

  In the conventional optical drop cable described above, as shown in FIG. 6C, two optical drop cables are installed between the same utility poles. In this case, the optical drop cables are usually the same. Because of the specifications, it is not easy to distinguish the first optical drop cable 202 from the second optical drop cable 206. Therefore, for example, as shown in FIG. 6D, the core wire 206b should be pulled down from the second optical drop cable 206 to the subscriber's home 207, but the core wire 202b is pulled down from the first optical drop cable 202. There is a problem of fear.

  Furthermore, when the SZ cable is used to branch after the middle, the optical fiber core wire is easy to be taken out, but there is a problem that the taken out optical fiber core wire is slack and hangs down. Moreover, since the cross-sectional area of the SZ cable is large, there is a problem that the number that can be inserted into the spiral hanger is limited.

  On the other hand, if the number of subscribers increases and it is no longer possible to meet the demand due to the follow-up of two optical drop cables, it will be possible to respond by installing a new trunk cable. The plurality of installed optical drop cables will be removed. Needless to say, the removed optical drop cable should be disposed of properly. However, the conventional optical drop cable does not have any unique identification mark to distinguish it from the additional optical drop cable. was there.

Therefore, the present invention has been made in view of such problems, and can easily perform an intermediate post-branching operation of an optical fiber so that a plurality of optical drop cables arranged side by side can be easily identified in the field. Accordingly, it is an object of the present invention to provide an optical drop cable that enables the pulling operation to be performed reliably and quickly, and enables traceability management of the optical drop cable after installation.

In order to solve the above-mentioned problems, the invention according to claim 1 is a configuration in which a plurality of optical fiber units in which an optical fiber core wire and a tension member are covered with a sheath are arranged in parallel so that the optical fiber core wires face each other. An optical drop cable comprising a plurality of optical fiber units integrally covered with a sheath, and an optical drop cable formed by being coupled to a support line, wherein the optical drop cable is connected between each optical fiber unit. Each optical fiber unit is formed on both sides of the outer sheath along the boundary of the outer sheath and covered with the outer sheath so that the optical fiber cores arranged in the respective optical fiber units after separation are not exposed. and separating notch which is separation possible to each other, from each of the corners of the envelope of the four corners of a substantially rectangular cross-sectional shape of the optical drop cable And a and optical fiber core wire drawer notch formed in the jacket so as to reach the vicinity of without optical fiber is positioned on its extension by forming toward the surface center, The identification mark for identifying the additional optical drop cable along the longitudinal direction of the optical drop cable is fixed on the surface of the optical drop cable in order to enable identification with the additional optical drop cable installed later in the same place. It is characterized by being described at every interval.

  In order to solve the above-mentioned problem, the present invention described in claim 2 is the optical drop cable according to claim 1, wherein the identification mark indicates the year of manufacture of the optical drop cable and the distance from one end at regular intervals. And a serial number which is a unique identification symbol.

  In order to solve the above-mentioned problems, the present invention described in claim 3 is the optical drop cable according to claim 1 or 2, wherein the identification mark further includes the type, manufacturer name, and material of the covering material of the optical drop cable. It is characterized by including at least one of these.

  In order to solve the above-mentioned problem, the present invention according to claim 4 is the optical drop cable according to any one of claims 1 to 3, wherein the identification mark is indicated by an appropriate color, so that the other color is indicated. The optical drop cable can be identified.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is the optical drop cable according to any one of claims 1 to 3, wherein the identification mark is displayed between the identification marks written at regular intervals. The surface of the optical drop cable on which nothing is marked is painted with an appropriate color so that it can be distinguished from other optical drop cables by the color.

According to the optical drop cable according to the present invention, it is possible to easily identify a plurality of optical drop cables arranged side by side with an identification mark in the field. is there.

Further, according to the optical drop cable of the present invention, the optical drop cable there is an effect that allows the laying after traceability management for optical drop cable by subjecting the unique identification label. As a result, it becomes possible to perform a follow-up investigation when an appropriate disposal process such as illegal dumping of an optical drop cable has not been performed, so that a deterrent effect such as illegal dumping can be expected.

Furthermore, according to the optical drop cable according to the present invention, in the case where the optical fiber core wire is branched from the installed optical drop cable in the middle, the optical fiber core wire can be branched in a covered state. Thus, there is no need to connect the branched optical fiber to another optical cable. Therefore, there is an effect that workability at the time of pulling down is greatly improved.

1 is a front view showing a preferred embodiment of an optical drop cable according to the present invention. It is a front view of the optical drop cable which shows coloring between identification marks. It is the sectional view on the AA line of the optical drop cable shown in FIG. It is a perspective view which shows other embodiment. It is a figure explaining the laying example of the drawing-in wiring of an optical drop cable. It is a figure explaining the other installation example of the drawing-in wiring of an optical drop cable. It is sectional drawing of the conventional optical drop cable. It is a partial side view of an SZ cable.

<< First Embodiment >>
[Configuration of optical drop cable]
Hereinafter, an optical drop cable according to the present invention will be described in detail based on a preferred embodiment. FIG. 1 is a front view showing a preferred embodiment of an optical drop cable according to the present invention, and FIG. 3 is a cross-sectional view taken along line AA of the optical drop cable shown in FIG. The optical drop cable 1 generally includes a cylindrical support line portion 10 and an optical fiber, and is connected to a lower portion of the support line portion 10 via a narrow connection portion 51, and as a whole. A cable portion 20 having a rectangular shape is provided. The illustrated optical drop cable 1 has, for example, the same outer dimensions of 2 mm × 5 mm (width × height) as a conventional optical drop cable.

[Configuration of support line]
First, the support wire portion 10 includes a support wire 11 formed of a steel wire (for example, 1.2 mmφ) that serves as a support medium when laid between utility poles, and covers the outer surface of the support wire 11 with a predetermined thickness. It is formed so as to be covered with a covering member 12 made of a synthetic resin such as flame retardant polyethylene. As shown in FIG. 1, an identification mark 13 is printed on the outer surface (for example, one side surface) of the covering member 12 by printing, engraving, attaching a printing tape, or the like. For example, the identification mark 13 is written as follows.

(Table 1)

“2SM (R15) KITANIHON 2010 FRPE 0717M No.00002”

  Here, “2SM (R15)” indicates the type of the optical drop cable 1, “KITANIHON” indicates the name of the manufacturer, and “2010” indicates 2010, which is the year of manufacture of this optical drop cable 1. "FRPE" indicates a material. Further, “0717M” indicates how long the portion where this identification mark is written is located from one end (starting end). For example, “0717M” indicates that the position (distance) is “717 m” from the start end. The length is written at regular intervals, in the case of this embodiment, every 1 m. “00002” shown next to the length is a serial number, and a different number is written for each turn of the optical drop cable 1. The type, manufacturer name, year of manufacture, material, and serial number are also displayed at regular intervals as well as the lengths displayed at regular intervals. In the case of the present embodiment, it is written in units of 1 m. Since the support wire portion 10 is not cut in principle when the optical fiber is pulled down, the identification mark 13 is preferably written on the surface of the support wire portion 10, but the side surface, the lower surface, etc. of the cable portion 20. Can also be written. The optical drop kale 1 is usually manufactured with a length of about 2,000 m per roll.

  Moreover, it can also be made distinguishable from the other optical drop cable 1 with the color by indicating the identification mark 13 with a suitable color. That is, the identification mark 13 of the optical drop cable 1 manufactured in a certain year (for example, 2010) is written in red, and the next year (2011) is written in blue. Thus, the difference in the optical drop cable 1 can be discriminated at a glance from the difference in color.

  In addition, as described above, the identification mark 13 is continuously written at an interval of about 1 m, but there is a portion where nothing is described between the identification mark 13 and the next different sign 13 to be recognized. To do. Therefore, it is possible to function as the identification mark 13 by forming the colored portion 15 colored with an appropriate color at least between the identification mark 13 and the next identification mark 13. That is, as in the case where the above-described identification mark 13 is colored and displayed, the adjacent optical drop cables 1 and 1 can be instantly distinguished by color. Of course, not only the color between the identification mark 13 and the next identification mark 13 but also the entire optical drop cable 1 may be colored. In this case, it is preferable to carefully examine the color of the identification mark 13 and the color to be colored on the surface of the optical drop cable 1 so that the identification mark 13 does not become the same color system so as to stand out.

  Since the unique identification mark 13 is written on the surface of the optical drop cable 1, it is easy to add additional light even when the additional optical drop cable 1 is later chased at a place where the optical drop cable 1 is already installed. It can be identified from the drop cable, and misidentification in the pulling operation can be prevented. Even if the optical drop cable 1 having the same serial number (“No. 00002”) is laid in the same system, the length display is always different, so that it can be distinguished from the additional optical drop cable. Further, when the length display is the same, the serial numbers are always different, so that the optical drop cables arranged in parallel can be easily identified.

[Configuration of cable section]
Next, the configuration of the cable unit 20 will be described. The cable portion 20 includes a first tension member 31 and a first optical fiber core wire 32, and a first optical fiber unit 30 integrated with a lower portion of the support wire portion 10 via a connection portion 51. A second optical fiber unit 40 including a second optical fiber core wire 41 and a second tension member 42, and being integrated with the first optical fiber unit 30 via a connecting portion 52. Yes.

The first and second optical fiber units 30 and 40 can be manufactured integrally with the covering member 12 by extrusion molding or the like. The covering member is made of, for example, flame retardant polyethylene, and the first tension member 31, the first optical fiber core wire 32, the second optical fiber core wire 41, and the second tension are included in these members. The member 42 is disposed so as to be parallel to the vertical direction, and the first and second optical fiber core wires 32 and 41 are disposed so as to face each other with the connecting portion 52 as the center. A cover 21 made of a synthetic resin material such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, or ethylene-propylene copolymer is provided so as to cover these. The first and second optical fiber cores 32 and 41 are, for example, optical fibers made of an ultraviolet curable resin-coated single core, and the periphery thereof is a silicone resin, an ultraviolet curable resin, a thermoplastic elastomer, or the like. It may be covered with. The first and second tension members 31 and 42 are made of FRP (glass fiber reinforced plastic) or the like.

  In addition, the outer jacket 21 is provided with a countermeasure against the bear seminar. Kuma-zemi has the habit of laying eggs in dead trees. It is known that the optical fiber core wire arranged at the tip of the wire will be disconnected. Therefore, in the present embodiment, V-shaped first and second notches (first optical fiber unit 30 to be described later) that are provided on both sides of the central portion in the cross section of the jacket 21 to form the connecting portion 52. And notches 22A and 22B for separating the second optical fiber unit 40 and the second optical fiber unit 40, and third grooves having a long groove shape formed from the corners of the four corners of the outer cover 21 in the substantially rectangular cross-sectional shape toward the center of the cross-section. Similarly, there are provided fourth notches 23A and 23B, and fifth and sixth notches 24A and 24B in the shape of long grooves provided from the additional corners of the jacket 21 toward the center of the cross section.

  The third, fourth, fifth, and sixth notches 23A, 23B, 24A, and 24B are pull-out notches for taking out the first and second optical fiber core wires 32 and 41, and the leading ends thereof are respectively provided. The first and second optical fiber cores 32 and 41 are formed in the vicinity of the first and second optical fiber cores 32 and 41, and the outer cover 21 is peeled off along the pull-out notches. Can be pulled out. When the first and second optical fiber cores 32 and 41 are pulled out, the first and second optical fiber cores 32 and 41 are covered with the jacket 21 respectively. Therefore, the second optical fiber unit 40 branched after the middle can be pulled down as it is, and an optical fiber cable (not shown) is used to pull down the optical fiber core 41 one by one. There is no need to connect. Therefore, it becomes possible to carry out the withdrawal operation very simply.

  Here, the third, fourth, fifth, and sixth notches 23A, 23B, 24A, and 24B have no first and second optical fiber cores 32 and 41 on their extension lines, and It is formed so as to reach the vicinity of the first and second optical fiber core wires 32 and 41. The tip ends of the third and fourth notches 23A and 23B and the fifth and sixth notches 24A and 24B are refracted so as to face the first and second optical fiber cores 32 and 41, respectively. Is formed. As a result, even if the oviposition tube of the bearfish is inserted into the third and fourth notches 23A and 23B or the fifth and sixth notches 24A and 24B and enters the outer casing 21 as it is, Since the first and second optical fiber cores 32 and 41 are not arranged, there is no possibility that the first and second optical fiber cores 32 and 41 may cause a disconnection accident.

[How to use optical drop cable]
Next, the usage method of the optical drop cable 1 mentioned above is demonstrated. As shown in FIG. 5, the optical drop cable 1 according to the present embodiment can be used for individually dropping from the drop closure to each subscriber's house. The optical fiber cores 32 and 41 can be used to drop to two subscriber houses. When it is necessary to separate the first optical fiber core 32 and the second optical fiber core 41, the cable portion 20 is positioned at a predetermined portion of a tool called a drop separator, and the first and second The first optical fiber unit 30 and the second optical fiber unit 40 are separated by applying the upper and lower blades of the drop separator to the notches 22A and 22B and grasping the lever, thereby separating the first optical fiber unit. 30 and the second optical fiber unit 40 can be withdrawn to two different subscriber houses. At that time, the second optical fiber unit 40 branched after the middle can be pulled down as it is, and there is no need to connect the optical fiber core wire 41 to another optical fiber cable.

  Further, in the optical drop cable 1, as described above, the identification mark 13 is printed on the outer surface of the covering member 12 of the support wire portion 10 and / or the coloring portion 15 is provided between the identification mark 13 and the identification mark 13. It has been. As shown in FIG. 5, the optical drop cable 1 is mounted on the spiral hanger 114. However, when the number of subscribers increases, another optical drop cable is attached to the spiral hanger 114. When the optical fiber core wire is pulled down to a new subscriber's house after installation, the operator of the laying work confirms the colors of the identification mark 13 and the coloring portion 15 printed on the optical drop cable 1 in advance. . If it is confirmed that the second optical drop cable is to be pulled down based on the color of the identification mark 13 or the colored portion 15, the optical fiber core is pulled from the optical drop cable. .

  In addition, when the number of optical fiber subscribers increases and the optical drop cable 1 cannot be dealt with alone, a multi-core optical cable is separately installed in that portion, and the optical drop cable previously installed is removed and removed. The optical drop cable is discarded. In this case, the waste must be disposed of properly without being dumped illegally. Even if the optical drop cable 1 is illegally dumped, the identification mark 13 or the colored portion 15 is provided, so that the serial number or the like is the optical drop cable installed in the place, It is possible to easily identify which construction contractor has removed and discarded it. Accordingly, the trend of the optical drop cable 1 can be tracked and investigated, so that a deterrent effect against illegal dumping is exerted, which greatly helps prevent illegal dumping.

[Effect of the first embodiment]
As described above, according to the optical drop cable 1 according to the first embodiment, even if the optical fiber units 30 and 40 are branched, the first and second optical fiber core wires 32 and 41 are respectively covered with the jacket 21. Therefore, the optical drop cable can be pulled down as it is, and the individual optical drop cable can be easily identified by the unique identification mark 13 and the coloring portion 15 for specifying the installed optical drop cable 1. There is an effect that the withdrawal operation can be performed reliably and quickly.

  In addition, even when the existing optical drop cable 1 is removed for disposal by replacement or the like, the installation location, construction contractor, disposal contractor, etc. can be easily traced and identified based on the identification mark 13 or the colored portion 15. Therefore, there is an effect that illegal dumping can be prevented in advance.

<< Other embodiments >>
[Configuration of optical drop cable]
Next, another embodiment will be described. Figure 4 is a perspective view showing another embodiment of an optical drop cable according to the present invention. The optical drop cable 2 is the same as the optical drop cable 1 according to the first embodiment described above, except that the first and second tension members 31 and 42 are covered with a jacket 21 in a substantially rectangular cross section (the identification described above also in this embodiment). And the first and second optical fiber core wires 32 and 41 with respect to the first and second tension members 31 and 42. The outer covering of the optical drop cable 2 in a substantially rectangular cross-sectional shape along the boundary between the first and second optical fiber units 30 and 40. Ninth and tenth notches (separation notches for the first and second optical fiber units 30 and 40) 26A and 26B are formed obliquely from two opposite corners of the 21 corners toward the center of the cross section. Then both The connecting portion 28 is formed between the ninth and tenth notches 26A and 26B, and the side surface of the outer jacket 21 at a position facing each other across the first and second optical fiber core wires 32 and 41, respectively. The inner surfaces of the ninth and tenth notches 26A and 26B are V-shaped eleventh and twelfth notches 27A and 27B and seventh and eighth notches 25A, respectively, which are notches for drawing out the core wire having a V-shaped cross section. , 25B, and other configurations are substantially the same as those of the first embodiment.

  A first optical fiber unit 30 located on the left side in FIG. 4 is formed by the ninth and tenth notches 26A and 26B, and a second optical fiber unit 40 located on the right side in FIG. 4 is formed. . The first and second optical fiber core wires 32 and 41 are covered with the outer sheath 21 so that they are not exposed even after the first and second optical fiber units 30 and 40 are separated. 1, the second optical fiber unit 30 and 40 are arranged in the second optical fiber unit 30 and 40, the second optical fiber unit 40 branched after the middle can be pulled down as it is, and an optical fiber (not shown) is used to pull down the optical fiber core wire 41 one by one. The point that it is not necessary to connect with a cable is the same as that of the first embodiment.

The first and second tension members 31 and 42 and the first and second optical fiber core wires 32 and 41 provided in the first and second optical fiber units 30 and 40 are arranged eccentrically with respect to each other for separation. Each optical fiber unit divided by the notch has a substantially triangular cross-sectional shape and is integrated by a connecting portion 28 formed at the tip of the ninth and tenth notches 26A and 26B which are separation notches. Therefore, by separating the first optical fiber unit 30 and the second optical fiber unit 40 by the ninth and tenth notches 26A and 26B, each light is separated from the eleventh and twelfth notches 25A and 25B. Since it becomes easy to fold the fiber units 30 and 40 in two, it is possible to easily make a crack in the direction of the first and second optical fiber core wires 32 and 41.

  In FIG. 4, the optical drop cable 2 includes a first optical fiber unit 30 by twisting the second optical fiber unit 40 by hand with respect to the first optical fiber unit 30 or cutting the connecting portion 28 with a dedicated tool. The second optical fiber unit 40 can be separated from the fiber unit 30. Further, when a force is applied by hand from the seventh notch 25A to the eleventh notch 27A or the jacket 21 is cut by a dedicated tool, the first optical fiber core wire 32 can be pulled out. Similarly, the second optical fiber core wire 41 can be pulled out by applying a force by hand from the eighth notch 25B to the twelfth notch 27B or cutting the jacket 21 with a dedicated tool. Further, when the connecting portion 51 is cut by applying a force by hand or using a dedicated tool, the support wire portion 10 and the cable portion 20 can be separated. In addition, since the laying method of this embodiment is substantially the same as that of the first embodiment, the description thereof is omitted.

[Effects of other embodiments]
According to the optical drop cable in another embodiment, the number of notches can be reduced as compared with the first embodiment, and the separation positions of the first optical fiber unit 30 and the second optical fiber unit 40 and the first and first optical fiber cables can be reduced. There is an effect that the drawing positions of the two optical fiber core wires 32 and 41 can be made clearer. The other effects are the same as those of the first embodiment.

  As described above, the preferred embodiments have been described. However, the optical drop cable according to the present invention can be applied to all optical drop cables that are installed in parallel regardless of the shape thereof.

DESCRIPTION OF SYMBOLS 1 Optical drop cable 2 Optical drop cable 10 Support line part 11 Support line 12 Cover member 13 Identification mark 15 Colored part 20 Cable part 21 Outer sheath 22A First notch 22B Second notch 23A Third notch 23B Fourth notch 24A 5th notch 24B 6th notch 25A 7th notch 25B 8th notch 26A 9th notch 26B 10th notch 27A 11th notch 27B 12th notch 28 Connecting part 30 1st optical fiber unit 31 1st tension member 32 1st optical fiber core line 40 2nd optical fiber unit 41 2nd optical fiber core line 42 2nd tension member 51 connection part 52 connection part

Claims (5)

What optical drop cables der formed by arranging in parallel a plurality as an optical fiber unit in which an optical fiber and a tension member covered with the outer skin the optical fiber to each other relative, the skin is more In the optical drop cable formed integrally with the optical fiber unit and combined with a support line ,
The optical drop cable is formed on both side surfaces of the jacket along the boundary between the optical fiber units, and the optical fiber cores arranged in the optical fiber units after separation are exposed. and separating notches of each said light phi Bayunitto are separable to each other in a state that the outer coated with the as not,
The optical fiber core wire is not positioned on the extension line by forming from the corners of the four corners of the jacket in the substantially rectangular cross-sectional shape of the optical drop cable, and the optical fiber is not positioned on the extension line. A notch for drawing out the core wire formed in the outer jacket so as to reach the vicinity of the core wire,
With
Identification for distinguishing the additional optical drop cable along the longitudinal direction of the optical drop cable on the surface of the optical drop cable in order to enable identification with an additional optical drop cable installed later in the same place An optical drop cable characterized by markings at regular intervals. The optical drop cable according to claim 1.
The identification mark is
The year of manufacture of the optical drop cable,
The cable length that describes the distance from one end at regular intervals,
A serial number, which is a unique identifier,
An optical drop cable comprising: The optical drop cable according to claim 1 or 2,
The identification mark further includes at least one of a type of the optical drop cable, a manufacturer name, and a material of the covering material. The optical drop cable according to any one of claims 1 to 3,
An optical drop cable characterized in that the identification mark is indicated by an appropriate color so that it can be distinguished from other optical drop cables by the color. The optical drop cable according to any one of claims 1 to 3,
By distinguishing the surface of the optical drop cable that is not marked between the identification mark written at regular intervals with the appropriate color, it can be distinguished from other optical drop cables by the appropriate color. An optical drop cable characterized by that.

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