JP4488602B2 - DSL splitter unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a splitter device that separates an audio signal and a data signal in DSL communication, particularly ADSL communication.
[0002]
[Prior art]
Development of DSL (Digital Subscriber Line) communication technology for performing digital data communication using a metallic cable, which is a telephone subscriber line, is active. DSL makes it possible to transmit digital data to an existing telephone subscriber line at a high speed using a band up to a frequency much higher than a band up to 4 kHz used in a telephone. In recent years, with the spread of the Internet, ADSL (Asymmetric DSL) with a high communication speed from the station to the subscriber side has attracted attention.
[0003]
FIG. 6 is a conceptual diagram of connection when ADSL communication is performed using an existing telephone line network. In the central office 600, an MDF (Main Distribution Frame) 604 is used to collect and connect subscriber lines from the home to the telephone exchange 602. In ADSL communication, an ADSL modem 608 is connected to the MDF 604 via a splitter device 606. The splitter device 606 superimposes the voice signal from the telephone exchange 602 (exchange MDF) and the data signal from the ADSL modem 608, and outputs them to the subscriber line through the subscriber MDF. A home splitter 610 is installed in each home, where the input signal is divided into a voice signal and a data signal and output to a data communication device such as a telephone or a computer. Also, the voice or data signal from the home is input to the splitter device 606 via the home splitter 610 and MDF 604, and if it is a voice signal, it is output to the telephone switch via the MDF 604 on the switch side. If it is a signal, it is output to a network such as a LAN via the ADSL modem 608.
[0004]
[Problems to be solved by the invention]
In ADSL communication, the splitter device 606 is usually installed in a rack 612 (hereinafter referred to as an ADSL rack or an ADSL rack) placed in a telephone office together with an ADSL modem. In the ADSL rack 612, a terminal board 614 has been conventionally used to connect the splitter device 606 to a number of lines in the MDF on the subscriber side and the exchange side.
[0005]
However, the connection between the splitter device using the terminal board and the MDF has the following problems.
(1) Since a very large number of connection cables corresponding to the number of lines are used to connect the terminal board and the splitter device, it takes a considerable amount of time to connect between them, and there is a possibility of causing incorrect wiring. it was high.
(2) A sufficient space is required for routing the connection cable, which hinders the downsizing of the ADSL rack.
(3) When the splitter device and the MDF are connected via the terminal board, it is difficult to check and isolate the cause when a communication failure occurs.
[0006]
Accordingly, an object of the present invention is to enable the splitter apparatus to be connected to the MDF without using the terminal board and its connection cable, thereby solving the conventional problems.
[0007]
[Means for Solving the Problems]
The present invention provides a DSL splitter unit including a plurality of splitter bases for separating an audio signal and a data signal and a casing that accommodates the plurality of splitter bases. In the DSL splitter unit, the housing includes a plurality of subscriber-side MDF connectors connected to the MDF on the telephone subscriber side and a plurality of switch-side MDF connectors connected to the MDF on the telephone switch side. The splitter board includes a modem connection terminal for connecting wiring for a predetermined channel from the DSL modem, a subscriber-side MDF connection terminal for connecting to the subscriber-side MDF connector of the casing, An exchange-side MDF connection terminal for connection to the exchange-side MDF connector, circuit wiring on a base for mutually connecting the modem connection terminal, the subscriber-side MDF connection terminal, and the exchange-side MDF connection terminal; and a signal separation means to isolate the said voice signal and the data signal passing through the circuit wiring on the board.
[0008]
When the DSL splitter unit having the above-described configuration is used, a terminal board is not required for connecting each splitter board to the subscriber side MDF or the exchange side MDF.
[0009]
In the present invention, the signal separation means allows the output of the audio signal from the subscriber side MDF connection terminal side to the exchange side MDF connection terminal side, and from the modem connection terminal side to the exchange side MDF connection terminal side. A signal filter for prohibiting the output of the data signal to the.
[0010]
Further, the signal separation means allows the output of the data signal from the subscriber side MDF connection terminal side to the modem connection terminal side, and the signal separation means from the subscriber side MDF connection terminal side to the modem connection terminal side. Includes a signal filter that prohibits the output of audio signals.
[0011]
In the present invention, a protection circuit against overvoltage may be provided on the circuit wiring.
[0012]
In a preferred embodiment, the circuit wiring includes signal lines for 20 channels.
[0013]
Further, in the present invention, the subscriber side MDF connector and the exchange side MDF connector of the casing press-fit the subscriber side MDF connection terminal or the exchange side MDF connection terminal of the splitter base, It is preferable to include a terminal insertion portion that maintains contact and a wiring connection portion that enables connection from the MDF on the subscriber side or the MDF on the exchange side.
[0014]
Further, each of the splitter infrastructure, in order to be able to monitor the state of the signals passing on the circuit wiring on the foundation, and the test circuit wiring which is branched from the circuit wiring, monitors the state of the signal It is preferable to provide a test connection terminal for connecting a device.
[0015]
In a preferred embodiment, each of the splitter boards is compliant with the ADSL communication method.
[0016]
The DSL splitter unit of the present invention further includes a splitter base conforming to the SDSL communication system, and the splitter base includes a modem connection terminal for connecting wiring for a predetermined channel from the DSL modem, and the casing. A subscriber-side MDF connection terminal for connecting to the subscriber-side MDF connector, and circuit wiring on a base for mutually connecting the modem connection terminal and the subscriber-side MDF connection terminal can be provided.
[0017]
The invention also relates to a DSL rack comprising the DSL splitter unit, which preferably comprises a DSL modem connected to each splitter board.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an ADSL rack equipped with a DSL splitter unit according to the present invention. The ADSL rack apparatus 100 is installed in a telephone office and accommodates equipment for realizing ADSL communication in a frame housing 102 thereof. Various units such as a power supply unit 104, an overvoltage monitoring unit 106, an ADSL modem unit 108, and a DSL splitter unit 110 according to the present invention are mounted on the frame housing 102 of the ADSL rack 100 as necessary. . In the figure, one in which two DSL splitter units 110 are accommodated is shown.
[0019]
FIG. 2 shows a perspective view of a DSL splitter unit according to the present invention. In the figure, the DSL splitter unit 110 includes a plurality of splitter bases 200 and a unit casing 202 that accommodates the splitter bases 200.
[0020]
The splitter base 200 realizes the function of the splitter device in ADSL communication. Here, the audio signal and the data signal in the communication path are separated and superimposed. A single splitter substrate 200 receives and processes signals for a plurality of channels (20 channels in the embodiment). Each splitter base 200 is configured to include electronic components for realizing its function on a printed wiring board, and a pair of connectors 204 and 206 are installed on the front side thereof.
[0021]
One connector 204 is connected to a connector (not shown) of a cable drawn from the ADSL modem unit 108 mounted in the ADSL rack 100 (hereinafter, this connector 204 is referred to as a modem connector 204). . Signals for a plurality of channels from the ADSL modem unit 108 are guided into the splitter board 200 via the modem connector 204.
[0022]
The other connector 206 can be connected to a signal monitoring device (not shown) for monitoring the transmission characteristics of signals transmitted through the splitter board 200 (hereinafter, this connector 206 is connected to the test connector 206). Called). By connecting a signal monitoring device via the test connector 206, it is possible to monitor the transmission characteristics of signals in the substrate prior to the operation of the splitter substrate. Note that the signal monitoring apparatus may be mounted in the ADSL rack apparatus 100 or may be used outside the rack. When measuring the signal, the signal monitoring device can be configured to be remotely controlled via a network.
[0023]
Each splitter base 200 includes four connection terminals 208 to 214 on the back side thereof. These connection terminals 208 to 214 are connected to the MDF in the telephone office via a connector of the unit housing 202 described later. That is, the connection terminals 208 and 210 are inserted into the connectors 216 and 218 on the unit housing 202 side connected to the MDF on the telephone exchange side when the splitter base 200 is mounted on the unit housing 202, and the connection terminals 212 are also connected. And 214 are inserted into connectors 220 and 222 on the unit housing 202 side connected to the MDF on the subscriber side. Hereinafter, the connection terminals 208 and 210 are referred to as an exchange-side MDF connection terminal, and the connection terminals 212 and 214 are referred to as subscriber-side MDF connection terminals.
[0024]
The connection terminals 208 to 214, the modem connector 204, and the test connector 206 are connected to each other by circuit wiring formed thereon on the splitter board 200. The wiring system on the splitter board 200 and the functional components on the circuit wiring will be described later.
[0025]
On the other hand, the unit housing 202 is attached to the frame housing 102 of the ADSL rack shown in FIG. 1 through the mounting ribs 224, and a plurality of (10 in the illustrated example) splitters are provided therein. The base 200 can be accommodated in a stacked form. Each splitter base 200 is inserted with its both side pieces along the rail 226 on the inner wall of the unit housing 202. Connectors 216 to 222 for inserting the connection terminals 208 to 214 of the splitter base 200 and maintaining the electrical connection are installed on the rear surface of the unit housing 202. For this purpose, each of the connectors 216 to 222 includes an insertion portion that holds the connection terminals 208 to 214 by press fitting and has electrodes that are in contact with the signal lines exposed on the surfaces thereof. Further, the connectors 216 to 222 are configured such that wiring from the MDF can be connected on the back side thereof, that is, on the side exposed to the outside from the unit housing 202. That is, a large number of wires from the MDF are drawn into the ADSL rack 100, and among them, the wires from the MDF on the telephone exchange side are connected to the corresponding connectors 216 and 218, and from the MDF on the subscriber side. The wiring is connected to the corresponding connectors 220 and 222. In one embodiment, the connectors 216 to 222 may have a V-shaped blade surface and maintain the connection by pressing the coated wiring here.
[0026]
FIG. 3 shows a front view of the DSL splitter unit 110 in a state where the splitter base 200 is accommodated. In the drawing, the connectors of the splitter base 200 housed in the unit housing 202, that is, the modem connector 204 and the test connector 206 are shown in an orderly arrangement. A plurality of cable connectors from the ADSL modem are connected to each of the modem connectors 204. Further, a cable from a test monitor device is connected to the test connector 206 as necessary.
[0027]
FIG. 4 shows a rear view of the DSL splitter unit 110. In the figure, connectors 216 and 218 for connecting wiring from the MDF on the exchange side and connectors 220 and 222 for connecting wiring from the MDF on the subscriber side are shown in an orderly manner. Yes.
[0028]
FIG. 5 shows a wiring system diagram on the splitter board 200. In the following, the circuit configuration on the splitter substrate and its function will be described with reference to this figure. As described above, the splitter board 200 includes the modem connector 204 connected to the ADSL modem, the test connector 206 that enables connection of the signal monitoring device, the switch MDF connection terminals 208 and 210 connected to the MDF on the switch side, and the subscriber. There are subscriber MDF connection terminals 212 and 214 connected to the MDF on the side. As shown in the figure, circuit wiring 230 for 20 channels is formed on the splitter substrate 200. The circuit wiring 230 includes a signal line 230a extending from the modem connector 204, a signal line 230b extending from the exchange MDF connection terminals 208 and 210, and a signal line 230c extending from the subscriber MDF connection terminals 212 and 214. Are connected to each other at a coupling point 232. The circuit wiring 230 also includes a signal line 230d extending from the test connector 206, which is connected to the signal line 230c.
[0029]
A DC blocking capacitor 234 is connected on the signal line 230a. The DC blocking capacitor 234 functions as a high-pass filter that works like a short circuit when the frequency of the input signal is high and cuts it when the frequency is low. That is, the DC blocking capacitor 234 passes only the data signal (high frequency component) by ADSL to the ADSL modem side among the signals input from the subscriber MDF or the exchange MDF to the splitter base 200, and transmits the voice signal (low frequency component). Block input to the ADSL modem.
[0030]
A low pass filter 236 is connected on the signal line 230b. The low-pass filter 236 allows only the audio signal to pass to the exchange MDF side, and the output of the data signal to the exchange MDF side is prohibited here. An overvoltage protection circuit 238 is provided on the signal line 230c. The overvoltage protection circuit 238 protects the circuit on the splitter board 200 against overvoltage such as lightning overvoltage and switching overvoltage.
[0031]
In the circuit configuration, an audio signal input from the MDF on the switch side to the signal line 230b via the switch MDF connection terminals 208 and 210, and a data signal input from the ADSL modem to the signal line 230a via the modem connector 204 Are superimposed at the coupling point 232 and output to the subscriber MDF connection terminals 212 and 214 from the signal line 230c. This signal is output from the connectors 220 and 222 to the MDF on the subscriber side through the cable, and is carried to the target house. As described with reference to FIG. 6, in the house, the audio signal and the data signal are separated by the in-house splitter and processed by the corresponding terminal (telephone or personal computer).
[0032]
On the other hand, signals input from the MDF on the subscriber side onto the splitter board 200 via the subscriber MDF connection terminals 212 and 214 are transmitted from the signal line 230c to the signal lines 230a and 230b. From the signal transmitted to the signal line 230a, only the high frequency component, that is, the data signal component is output to the modem connector 204 side by the DC blocking capacitor 234. As a result, only the data signal among the input signals is output to the ADSL modem connected here. In addition, the low-frequency component of the signal transmitted to the signal line 230b, that is, only the audio signal component, is output to the exchange MDF connection terminals 216 and 218 by the low-pass filter 236. As a result, only the audio signal among the input signals is output to the MDF on the exchange side connected here. As described above, the audio signal and the data signal are superimposed and separated on the splitter substrate 200.
[0033]
The DSL splitter unit 110 may include a splitter base conforming to SDSL (symmetric DSL) communication and a splitter base conforming to the ADSL communication. For example, the splitter base for SDSL communication can be configured not to transmit an audio signal. In this case, only the signal line connecting the ADSL modem and the subscriber MDF and the test signal line are wired.
[0034]
The embodiment of the present invention has been described with reference to the drawings. The scope of application of the present invention is not limited to that described in the above embodiment, and modifications and improvements can be made based on the description of the scope of claims. The DSL splitter unit of the present invention can also be configured in accordance with a DSL communication standard other than ADSL. Further, the DSL splitter unit according to the present invention can be installed in the intra-station MDF rack, and in this case, the connection wiring can be further simplified. Furthermore, in the present embodiment, the connector 204 for connecting the cable from the ADSL modem is provided on the splitter base 200, but this may be a connection terminal configuration similar to the MDF connection terminals 208 to 214.
[0035]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) In order to connect the splitter device and the MDF, a terminal board and a connection cable are not required, the connection work is remarkably simplified, and the possibility of causing erroneous wiring is extremely low.
(2) A space for routing the connection cable, which has been conventionally required, becomes unnecessary, and the space in the DSL rack can be used effectively.
(3) Since the connection configuration is simplified, it is easy to check and isolate the cause when a communication failure occurs.
(4) The number of parts required for connection can be reduced and cost reduction can be realized.
(5) In the present invention provided with test wiring on the splitter base, the operator managing the DSL rack can measure the line status at the time of the failure, and can quickly determine the failure and perform periodic diagnosis. Become.
[Brief description of the drawings]
FIG. 1 is a front view of an ADSL rack equipped with a DSL splitter unit according to the present invention.
FIG. 2 is a perspective view of a DSL splitter unit according to the present invention.
FIG. 3 is a front view of the DSL splitter unit in a state in which the splitter base is accommodated.
FIG. 4 is a rear view of the DSL splitter unit.
FIG. 5 is a wiring system diagram on a splitter board.
FIG. 6 is a connection conceptual diagram in the case of performing ADSL communication using an existing telephone line network.
[Explanation of symbols]
100 ADSL frame 102 Frame housing 104 Power supply unit 106 Monitoring unit 108 ADSL modem unit 110 Splitter unit 200 Splitter base 202 Unit housing 204 Modem connector 206 Test connector 208, 210 Exchanger MDF connection terminal 212, 214 Subscriber MDF connection terminal 216 218 Exchange side connector 220, 222 Subscriber side connector 224 Rib 226 Rail 230 Circuit wiring 230a-230d Signal line 232 Connection point 234 DC blocking capacitor 236 Low-pass filter 238 Overvoltage protection circuit 600 Telephone office 602 Telephone exchange 604 MDF
606 Splitter device 608 ADSL modem 610 In-home splitter 612 ADSL rack 614 Terminal board

Claims (11)

A DSL splitter unit comprising a plurality of splitter bases for separating an audio signal and a data signal, and a housing accommodating the plurality of splitter bases,
The housing is
A plurality of subscriber-side MDF connectors connected to the telephone subscriber-side MDF;
A plurality of exchange-side MDF connectors connected to the telephone exchange-side MDF;
Each splitter base is
A modem connection terminal for connecting wiring for a predetermined channel from the DSL modem;
A subscriber-side MDF connection terminal for connecting to the subscriber-side MDF connector of the housing;
An exchange-side MDF connection terminal for connecting to the exchange-side MDF connector of the housing;
Circuit wiring on a base for mutually connecting the modem connection terminal, the subscriber side MDF connection terminal and the exchange side MDF connection terminal;
A signal separation means to isolate the said voice signal and the data signal passing through the circuit wiring on the foundation,
DSL splitter unit with The signal separation means permits the output of the audio signal from the subscriber side MDF connection terminal side to the exchange side MDF connection terminal side, and the data from the modem connection terminal side to the exchange side MDF connection terminal side. The DSL splitter unit according to claim 1, further comprising a signal filter that inhibits signal output. The signal separation means allows the output of the data signal from the subscriber side MDF connection terminal side to the modem connection terminal side, and the audio signal from the subscriber side MDF connection terminal side to the modem connection terminal side. The DSL splitter unit according to claim 2, further comprising a signal filter for inhibiting the output of the DSL splitter unit. The DSL splitter unit according to claim 1, further comprising a protection circuit against overvoltage on the circuit wiring. The DSL splitter unit according to any one of claims 1 to 4, wherein the circuit wiring includes signal lines for 20 channels. The subscriber side MDF connector and the exchange side MDF connector of the casing are:
A terminal insertion part for press-fitting the subscriber-side MDF connection terminal or the exchange-side MDF connection terminal of the splitter base and maintaining contact of the contact;
A wiring connection section that enables connection from the MDF on the subscriber side or the MDF on the exchange side; and
The DSL splitter unit according to claim 1, comprising: Each splitter infrastructure, in order to be able to monitor the state of the signals passing on the circuit wiring on the foundation, and the test circuit wiring which is branched from the circuit wiring, the device for monitoring the state of the signal The DSL splitter unit according to claim 1, further comprising a test connection terminal for connection. The DSL splitter unit according to any one of claims 1 to 7, wherein each of the splitter bases conforms to an ADSL communication system. It further comprises a splitter base conforming to the SDSL communication method,
A modem connection terminal for connecting wiring for a predetermined channel from the DSL modem;
A subscriber-side MDF connection terminal for connecting to the subscriber-side MDF connector of the housing;
Circuit wiring on a base for mutually connecting the modem connection terminal and the subscriber side MDF connection terminal;
The DSL splitter unit according to claim 8, comprising: A DSL rack comprising the DSL splitter unit according to claim 1. The DSL rack according to claim 10, further comprising a DSL modem connected to each of the splitter boards.

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