KR940008776B1 - Communication system with optical fiber cable - Google Patents

Abstract

The system for identifying the individual line of the optical cable to replaceor connecting it between the subscriber (8a) and the optical distribution panel of the main station (FDF;2a) includes a communication line (30) included in the optical cable (3a), a portable communication apparatus connected to a communication line terminal (dz) of an optical terminal box (5a) for the field engineer, an FDF call responding apparatus connecting to a terminal (Oz) of the panel (2a), and a portable testing apparatus with an FDF jag (18a) connected to the FDF for the FDF engineer.

Description

Subscriber's optical cable core channel system

1 and 2 are schematic diagrams of a conventional fiber optic cable-conversion channel system.

3 is a diagram illustrating an embodiment of an optical cable core line communication channel system according to the present invention.

4 is a configuration diagram of an embodiment of a core line control channel system at the time of branching of an optical cable according to the present invention.

* Explanation of symbols for main parts of the drawings

la: exchanger or distribution system 2a: optical wiring board (FDF)

3a: optical cable 4a: cable core wire

5a: optical terminal box 6a: optical connection terminal

7a: Light incoming line 9a: Call line for FDF personnel

11: Calling device 18a: FDF jack

30: field agent dedicated call core 31,31: optical conversion converter

33: Portable tester for FDF personnel 34: FDF call answering device.

The present invention relates to the construction of a subscriber line system, and more particularly, to a telephony channel system for an optical cable core control test between an optical switchboard (FDF) of a central station and a subscriber in an optical subscriber system composed of pure optical cables.

After the construction of the subscriber's optical cable, the core control test for the replacement of the optical cable and the subscriber's hypothesis and core replacement is necessary.

Conventional copper wire cable operation in this core control operation, the field agent captures the effective line of the existing subscriber in the terminal box, using the valid line to call the test personnel in the laboratory, and the test personnel again MDF personnel In the case of conducting core wire coordination in the state of three-way communication between the field agent, the test agent and the MDF agent, but the pure fiber cable is introduced to the subscriber, the field agent is intercepted to find the effective line of the terminal box. This is almost impossible, and in particular, the centralized maintenance system requires a special call splitter (ACD) having a three-way call function, including an incoming line, in order to form a three-way call.

In addition, there were inconveniences that the idle line subscribers occupied by field agents could not use while occupied by field agents.

The prior art will be described in detail with reference to FIGS. 1 and 2 as follows.

In FIG. 1, 1 is an exchanger or distribution system in a central station, 2 is a main switchboard (MDF) and is composed of input terminals i1 to in and an output terminal of 01 to 0n, and an MDF input terminal is output from the distribution system 1. Connected with However, the number of MDF input terminals is typically greater than the number of outputs of the distribution system 1. The MDF output terminals are connected to each core 4 of the cable 3, and the number of MDF output terminals is typically larger than the total number of each core 4. 3 is a subscriber cable, in which a plurality of cable cores 4 exist in the subscriber cable. 5 is a terminal box, and there is a connection terminal 6 for connecting the gable core wire 4 and the subscriber lead wire 7 with each other. 7 is a subscriber line and 8 is a subscriber. 9 is a call line for connecting the distribution system 1 and the manual test bench 10. 10 is a manual test bench, 11 is a call apparatus inside the manual test bench 10, and is a device for transmitting a call signal to the call device 15 for the MDF personnel. 12 is a tester inside the manual test bench, which measures the state of the cable core 4 through the MDF jack, 13 is a three-way communication device, and 14 is a control panel inside the manual test bench. The manual test bench is also fixed in the operator's room and operated by the operator 22. 15 is a call device (telephone) for MDF personnel, and 16 is a call device (telephone) for operating personnel. 17 is a field phone call device. 18 is an MDF jack, which is connected to the tester 12 of the manual test bench, and is provided to connect the MDF input terminal or the output terminal in the MFD. 19 indicates that the subscriber is currently idle. 20 is an MDF agent, 21 is a field agent, and 22 is a test seat operator.

The operation of FIG. 1 will now be described.

First, the field agent 21 dispatched to the field is dispatched to the corresponding terminal box 5, which is already hypothesized, and is a portable field agent call device for finding a currently idle subscriber among dl ~ dj, one of the subscriber terminals 7 Use (17) to contact dj first and then eavesdrop.

When an idle subscriber line is detected and the field agent 21 calls the operating agent 22 using the dial dispensing device of the call device 17 in contact with the dj, the distribution system 1 connects the dj to the call line (9). ) And generate a call signal to the call device 16 for the operator.

Next, when the field agent 21 requests the operation agent 22 to call the MDF agent 20, the operation agent operates the call device 11 through the operation panel 14 to call the call device of the MDF agent. When the MDF agent 20 responds through the call device 15 for the MDF agent, the three-party call configuration value 13 is activated to operate the call device 17 and the operating agent 22 of the field agent 21. A three-way communication path is formed between the call device 16 of) and the call device 15 of the MDF agent 20.

Next, when the field agent 21 requests a core control test to the operating agent 22 and the MDF agent 20, the MDF agent 20 connects the MDF jack 18 to the corresponding MDF output terminal Ox. The operator 22 connects the tester 12 through the operation panel 14 and measures the state of the cable core 4 connected to Ox, which is an MDF output terminal.

At this time, when the field agent 21 opens and closes the dx, which is a terminal in the terminal box, the measured value of the tester 12 is changed. Therefore, the operating agent 22 provides the measured value to the field agent 21 and the MDF agent 20. The cable core control test is completed by indicating whether there is a change.

Thus, in the conventional method shown in FIG. 1, a field agent finds an idle cable core connected to an exchanger or a distribution device in a terminal box, and calls the operating agent using the cable core, and then the operating agent calls the MDF agent. After the call, establish a three-way channel and conduct a core control test using the operator's tester.

FIG. 2 installs an automatic line tester 23 which can be connected to a remote site instead of the manual test bench of FIG. 1, and in the remote site, a special automatic call distribution device (ACD) that can be configured as a three-way call with the central control unit 25. (26) is a schematic diagram of cable core control test in the case of centralized maintenance system where remote control center and special ACD accommodate multiple exchanges or distribution systems.

The operation of FIG. 2 is as follows.

First, the field agent 21 connects to the dj, which is one of the terminals 6, in the terminal box 5 using the field agent call device 17, and detects the idle subscriber 19, and then operates the remote operation agent 22. When the call is made, the exchange or distribution system 1 is connected to the dj call line 9 to extend to the special ACD 26 to call 16. When the remote operator 22 responds using the call device 16 for the operator, the field agent 21 requests a core control test from the operator 22, and the operator 22 receives a special ACD 26. MDF personnel 20 by connecting the dedicated call line 29 of the < RTI ID = 0.0 >) < / RTI > to the automatic line tester and driving the calling device 11 in the automatic line tester 23 through the central control unit 25 using the terminal 24. Call When the MDF agent responds using the call device 15, the operating agent 22 again operates the three-way call setup device 13 in the special ACD 26 to operate the field agent 21, the MDF agent 20, and the like. The three-way communication path between the operating personnel 22 is configured.

Next, when the field agent 21 requests the core control test from the operating agent 22 and the MDF agent 20, the MDF agent 20 connects the MDF jack 18 to the corresponding MDF output terminal Ox, The operating personnel extends the tester 12 of the automatic line tester 23 through the terminal 24 to the MDF jack 18 to measure the state of the cable core 4 connected to the MDF output terminal Ox.

At this time, when the field agent 21 opens and closes the terminal dx in the terminal box, the measured value of the tester 12 is changed. Therefore, the operating agent 22 provides the measured value to the field agent 21 and the MDF agent 20. Conduct the cable core control test by indicating the presence or absence of a change.

As described above, the conventional method shown in FIG. 2 is to install a special ACD at a remote location, and to control an automatic line tester at a remote location. After finding and using this cable core, call the operating personnel, and the operating personnel call the MDF personnel to build a three-way communication path, and conduct the core control test using a remote tester.

However, conventional structures such as FIGS. 1 and 2 have the following problems. First, the field agent must find the idle cable cores connected to the exchange or distribution device among the terminals in the terminal box, and a complicated three-way communication path must be formed by the involvement of the operating personnel for MDF agent calls and tester use. In particular, in the centralized preservation system as shown in FIG. 2, an expensive special ACD called a three-way call including a trunk line is required, and a three-way call is established between a remote special ACD and a central controller and an automatic line tester and an exchange or distribution system. A dedicated line connection was needed for overhaul and testing.

In addition, in the case where a pure optical cable is introduced to the subscriber cable, even if the field agent finds an idle cable core for the core control test, the above method cannot be applied due to the characteristics of the optical cable.

In order to solve this problem, different color coding is applied to each core of the optical cable so that the same color coded core wires are used for each cable connection for equal number of core wires or branches according to the necessity of cable extension in the same section. It is possible to connect only with each other, but all of these operations are performed by hand, and there is a risk of incorrect connection. As the number of cores in the cable increases, the probability of misconnection increases, especially when one cable core is defective. It becomes unusable and increases the cost of different color coding for each core.

As an alternative, it is possible to provide a field phone with a dedicated wireless phone, but the cost is very expensive, and due to the nature of their work, they occupy public wireless channels for a long time.

The present invention has been made to eliminate the above problems, and in order to reduce the operating costs and to be able to be used even when a subscriber optical cable is introduced, in particular, only the core wire color for field personnel in an optical cable having a plurality of optical fiber core wires is used. To provide a subscriber optical cable core control call system that installs coding (e.g. black fiber) and connects all cables in common even when branching cables. The purpose was to.

In order to achieve the above object, the present invention provides an optical fiber switchboard for a subscriber optical cable core line control channel system for optical cable replacement and subscriber hypothesis and core replacement between an optical switchboard (MDF) and an optical subscriber of a central station. A telephony core dedicated to at least one field agent assigned in at least one subscriber optical cable connected between an FDF and an optical terminal box for connecting a plurality of optical subscribers; A field communication portable communication means connected to the field agent dedicated call core connection terminal (dz) of the optical terminal box; FDF call answering means connected to the field agent dedicated telephone connection terminal (Oz) of the optical switchboard (FDF); And a portable test means for FDF personnel having an FDF jack connected to one connection terminal of the optical switchgear.

In addition, in the optical fiber cable system for the subscriber's optical cable core connection, at least one field core cable for field personnel should be installed in the optical cable between the optical switchgear (FDF) and the optical terminal box of the central station. Characterized in that the field personnel dedicated call core in common in a tree / branch form.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of FIGS. 3 and 4.

3 is a diagram illustrating an embodiment of an optical fiber core-conducting channel system according to the present invention, in which la is an exchanger or a distribution system, and 2a is an optical fiber for an optical cable instead of an MDF for a copper wire cable. MDF (hereinafter referred to as FDF) is used, 3a represents an optical cable, and 4a represents an optical cable core wire.

5a is an optical cable terminal box, and 7a is an optical lead wire for optical subscriber. 8a is an optical subscriber terminal, 9a is a call line for an FDF agent, 8 is a caller, 18a means an FDF jack (hereinafter referred to as an FDF jack), and 30 is a color coded core wire for a field agent. This is the only currency used for calls between field personnel and FDF personnel (20). That is, the optical cable 3a is composed of a plurality of subscriber optical cable core wires 4a and core wires 30 for field personnel.

31 is a device for converting an electrical signal of the portable communication device 17 into an optical signal as part of the portable communication device 17 of the field agent 21.

32 is a photoelectric conversion device constituting a part of the call answering device 34 for calling the FDF agent 20, and is used because the call line 9a and the field agent dedicated core 30 for the FDF agent are optical cable core wires. .

33 is a portable small tester which can be tested in the state of the optical cable core wire 30, and a known time-domain optical reflection wave measuring device (OTDR) is used.

34 is an FDF call answering device, which is fixedly installed similarly to the conventional manual test bench 10 and the automatic line tester 23, but does not include a tester, a three-way communication device, a computer interface, and only a photoelectric conversion device ( 32) and FDF agent call device 8 are present and are located in the FDF agent room and operated by FDF personnel.

Oz is a terminal to which the field agent-dedicated core line 30 and the FDF agent call line 9a are connected among the output terminals of the FDF, and dz is a terminal connected to the field agent-dedicated core line 30 in the terminal box.

As shown in the drawing, the present invention is an optical cable core cable call channel system, and the call path between the field agent and the FDF agent may be configured as follows for the core cable of the subscriber optical cable.

That is, the optical device for connecting the field device call device 17 and the photoelectric conversion device 31 which is part of the field device, the connection terminal dz in the terminal box and the field agent dedicated core 30 and the connection terminal Oz in the FDF. (9a), and the photoelectric conversion device 32 inside the FDF call answering device 34 and the call device 8 and the call device 15 of the FDF agent are connected.

In addition, the connection of the test apparatus for the core control test is configured by connecting the tester 33 carried by the FDF personnel and the FDF jack 18a for connecting the corresponding core wire in the FDF.

Referring to the operation and operation of the optical cable core cable call channel system of the present invention described above are as follows.

First, when the field agent 21 is dispatched to the terminal box 5a, the field agent 21 connects its portable communication device 17 and 31 to the terminal dz to which the field agent dedicated core wire 30 is connected. Then, when the call signal is generated by the portable communication device 17, the call signal is converted into an optical signal by the photoelectric conversion device 31, and the optical signal is transmitted through the field agent dedicated core wire 30 through the terminal dz of the terminal box. The photoelectric converter is transmitted to the output terminal (Oz) of the FDF, and this optical signal is transmitted to the call line (9a) connected to the FDF output terminal (Oz) and connected to the calling device (8) for calling the FDF agent. In 32), the signal is converted into a call signal again. The calling device 8 recognizes this calling signal and sends a ringing tone to the FDF agent calling device 15 for the calling signal to call the FDF agent.

When the FDF agent 20 recognizes the call tone and responds as the FDF agent call device 15, the call device 8 detects this and stops transmitting the call tone, and sends a response signal to the field agent again. By transmitting through), a call is made between the field agent 21 and the FDF agent 20 using the field agent-dedicated core wire 30 as a call path.

Next, when the field agent 21 requests a core control test to the FDF agent 20, the FDF agent 20 connects his portable small tester 33 (e.g., OTDR) to the FDF jack 18a and Connect the jack to the corresponding FDF output terminal Oz and measure the condition of the optical cable core (4a) connected to Ox. In this case, when the field agent 21 connects a terminator with a reflector to the terminal box dx, the measured value of the tester 33 of the FDF agent 20 appears to be changed (for example, a change in the reflection waveform). 20) The cable personnel control test is completed by informing the field agent 21 of the change of the measured value.

As shown above, FIG. 3 is a cable core-control test configuration in the case of adding the field agent-dedicated core to the subscriber optical cable, and FIG. 4 is connected to a plurality of terminal boxes by branching the optical cable 3a of FIG. In this case, an embodiment of connecting the field agent dedicated core wire is shown.

In FIG. 4, the same reference numerals as used in FIG. 3 denote components.

3b of FIG. 4 indicates an optical cable having a smaller core than the optical cable 3a (eg, 3b is 300 cores or 200 cores when 3a is 600 cores), and 3c is an optical cable having a higher quantity of core wires than the above 3b. 100-core). 5al to 5a5 are shown as different symbols because the same terminal box and installation place are different from those of the optical terminal box 5a. 35a denotes a branching point to which the cables 3a and 3b are connected, and 35b denotes a branching point to which the optical cables 3b and 3c are connected. The core cable for subscribers in 3a, 3b, and 3c is connected in a one-to-one correspondence as in the conventional method. Omitting the display, only the field agent dedicated core 30 is shown to indicate that the common connection to the tree / branch structure at all branch points.

Operation and operation thereof will be described as follows.

When the field agent 21 is dispatched to an arbitrary terminal box (e.g., 503), he / she connects to dz using his portable communication device (31, 17), and makes a call with the MDF agent (20). In 31), the voice signal is converted into an optical signal and transmitted from dz to 356. In 356, since 3b and 3c are commonly connected, signal attenuation occurs and is transmitted to 3b. At the branch point 35a where 3a and 3b are connected, Again signal attenuation occurs. Thereafter, after passing through 3a to Oz and 9a and passing through the photoelectric conversion device 32, the optical signal is converted into a voice signal and transmitted to the MDF agent 20.

In the above case, when the copper wire is used, the signal mismatch occurs due to the impedance mismatch and the noise induced by the electromagnetic waves, and the signal attenuation increases as the number of branch points increases. However, when the fiber optic cable is used, it is difficult to induce external signals without being affected by electromagnetic waves due to the characteristics of the optical fiber.In addition, although the information transmission capability of the optical fiber is much larger than that of copper wire (more than 10 ⁶ times), the actual information is used as voice information. (Voice call between FDF agent and field agent: 4KHz) As the number of branch points increases, it does not affect within the subscriber section.

As described above, according to the present invention, an FDF and a connection terminal of a field agent dedicated core line are added to each terminal box, and a field agent dedicated core line (eg, color coded) is added in an optical cable having a plurality of optical fiber core lines, In the case of branching, all of the above-mentioned pre-existing personnel-only cores are connected in common, and the cores can be used as a field line dedicated to field personnel, and the FDF agent directly responds to the call of the field personnel and conducts a line test of the cores with his portable tester. This eliminates the involvement of operating personnel, thus reducing manpower and work efficiency, and reduces costs by eliminating the need to occupy exchangers or distribution systems and idle tracks. Special ACD for shortened, three-way calls for core control tests at the time of the introduction of intensive maintenance systems Costs are reduced by eliminating the need for dedicated circuits and leased lines. In particular, the introduction of fiber-optic cables allows for core-contrast testing, and color coding for subscriber cores in the fiber-optic cable is unnecessary, reducing cable manufacturing costs and reducing subscribers during cable branching. The possibility of misconnection of the core wire is eliminated and the working efficiency is increased, and any good core wire of one cable can be connected to any good core wire of the opposite cable, thereby increasing the use efficiency.

Claims (4)

Optical switchboards connected to and controlled by a distribution system in a fiber optic cable-to-core call exchange system for the replacement of optical cables 3a and subscriber hypothesis and core replacement between the optical switchboard (FDF) 2a and the optical subscriber 8a of the central station. (FDF) 2a and a field agent dedicated call core 30 allocated at least one or more in the subscriber optical cable 3a connected between the optical terminal box 5a for connecting a plurality of optical subscribers; A portable communication means for the field agent, which is connected to the field agent dedicated call core connection terminal (dz) of the optical terminal box 5a; An FDF call answering means connected to a field core connection terminal (Oz) for field personnel of the optical switchboard (FDF); And an agent portable test means (33) having an FDF jack (18a) connected to one connection terminal of the optical switchboard (2a). 2. The portable communication means according to claim 1, further comprising: first photoelectric conversion means (31) connected to said connection terminal; And a first call means (17) connected to the first photoelectric means (31), wherein the FDF call answering means comprises: second photoelectric conversion means (32) connected to a field core connection terminal for field personnel of the optical switchgear; FDF agent call means (8) connected to said second photoelectric conversion means; And a second call means (15) connected to said FDF agent calling means. The system of claim 1 or 2, wherein the field agent dedicated call core 30 is colored in a specific color so as to be distinguished from the other cores 4a in the optical cable. . In the subscriber cable core line call channel system, at least one field agent-oriented communication core line is installed in the optical cable (3a) between the optical switchboard (FDF) 2a of the central station and the optical terminal box. The subscriber line optical fiber core line call channel system, characterized in that the branch line dedicated to the field personnel when the branch to a plurality of small-capacity optical cable (3b, 3c) in common connection in a tree / branch form.