JP4207648B2 - Optical subscriber line connection unit and residential termination equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides an optical subscriber line.ContactMore specifically, the connection unit and the home termination device are intended to reduce the construction burden at the subscriber's home when subscribing to the optical subscriber line.
[0002]
[Prior art]
Currently, connection systems such as ISDN (Integrated Services Digital Network), ADSL (Asymmetric Digital Subscriber line), and FTTH (Fiber to the Home) are known as subscriber communication systems. Among them, FTTH has a high communication speed. It has become popular year after year because of its high communication stability. FIG. 8 shows a configuration of a passive optical network (PON) based on FTTH, which includes an optical line terminal (OLT) 1 and a plurality of optical network units (ONUs) 2 arranged in each home. The multi-branch connection is made by an optical fiber cable 3 through a coupler. The transmission frame control system for optical data lines uses a time division multiplexing (TDM) system for downstream frames, while avoiding signal collision by allocating appropriate time slots for upstream frames according to the amount of traffic on the subscriber side. Etc., and the best-effort type communication with a maximum communication speed of 100 Mbps is performed.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-57685
[0004]
[Problems to be solved by the invention]
However, in the current FTTH configuration as shown in FIG. 8, since the optical network unit (ONU) 2 is installed in the subscriber's home, it is necessary to enter the home in order to draw the optical fiber cable 3 into the home. There is a problem that has hindered the spread of detached houses. Although it is conceivable to install the optical network device 2 outside the house, in that case, it takes a lot of work to supply power to the optical network device 2, so the optical network device 2 is also installed in the house. The current situation is that the optical fiber cable 3 has to be pulled into the house.
Further, when the optical fiber cable 3 is pulled into the house, troubles such as making a hole for inserting the cable in the outer wall of the house or drawing the optical fiber cable 2 along the outer wall to the hole for inserting the duct of the air conditioner occur. At the same time, when a hole is made in the outer wall, there is a trouble that the subscriber must obtain an understanding beforehand.
Further, except for new houses where LAN wiring is laid in advance, cable wiring in the house must be exposed wiring, which is not preferable from the viewpoint of appearance and function.
[0005]
Therefore, it is desirable to use existing wiring for in-home transmission. Such can be power lines and telephone lines. As for the power line, a high-speed transmission system suitable for FTTH has not yet been legally approved, and a telephone line is promising. In the case of a telephone line, it is necessary to be able to coexist with an existing analog telephone, and ADSL and VDSL are known as methods for coexisting an analog telephone and data transmission using the existing telephone line. However, even if these methods using only the splitter are adopted, the problem that the power supply to the optical network device 2 installed outside the house is very troublesome is not solved.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily join an optical subscriber line without carrying out home construction.
[0007]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention provides:Installed in the subscriber's home, connected to the optical fiber cable wired from the master station to the subscriber's home, and interposed in the telephone line connecting the subscriber's home and the telephone station, A connection unit that relays
  The connection unit is connected to an optical fiber cable to perform an O / E / E / O conversion;
  A telephone line modulation / demodulation unit that is connected to the photoelectric conversion unit on one side and connected to the telephone line side on the other side to modulate / demodulate data;
  DC power supplied from the power source in the subscriber's home through the home telephone line is separated, and a DC separator for supplying power to the photoelectric converter and the telephone line modem is provided.
  In addition, a DC blocking unit that detects that power is supplied from the in-house telephone line and blocks the DC component from the outside telephone line while allowing an AC component to pass therethrough is provided. Optical subscriber line connection unitIs provided.
[0008]
  UpOConnection unit with photoelectric conversion unit that performs E / E conversionofOutsideOutdoor such as wallsInstall inWhenThe optical fiber cable does not need to be pulled into the subscriber's home, and the connection unit can communicate with the home terminal device via the home telephone line, so there is no need to make a hole in the outer wall of the subscriber's home and No on-site construction is required.
  In addition, the power source for operating the connection unit is supplied from the inside of the house using a home telephone line as a signal line between the connection unit and the home terminal device. It is possible to eliminate the need for construction.
[0009]
Since the above-mentioned home telephone line is an existing telephone line, it can be wired without exposing the cable in the house, and both the appearance and the function are good.
[0010]
The connection unit is connected to an external telephone line connected to a telephone station, and the telephone connected to the home terminal device can use an analog telephone through the external telephone line.
[0011]
With the above configuration, conventional analog telephone calls can be used as they are, and subscribers can use IP telephones with good cost performance and analog telephones with stable call quality, depending on the situation. Improves.
[0012]
The present invention is a connection unit that is installed in a subscriber's house and connected to an optical fiber cable wired from the master station to the subscriber's house,
A photoelectric conversion unit connected to the optical fiber cable for O / E / E / O conversion;
A telephone line modulation / demodulation unit that is connected to the photoelectric conversion unit on one side and connected to the telephone line side on the other side to modulate / demodulate data;
A DC separation unit for separating DC power supplied from the power source in the subscriber's home via the home telephone line and supplying power to the photoelectric conversion unit and the telephone line modulation / demodulation unit; An optical subscriber line connection unit is provided.
[0013]
With the above configuration, when an optical signal is transmitted downstream from the master station, the optical signal from the optical fiber cable is O / E converted into a digital electric signal in the photoelectric conversion unit, and the modem for the telephone line A digital electrical signal can be modulated and transmitted to a home phone line. (The reverse is true for uplink transmission.)
Further, the DC separation unit can separate the DC power supplied from the power source in the subscriber's home via the home phone line from the home phone line and supply the driving power to the photoelectric conversion unit and the wire modulation / demodulation unit. It is possible to eliminate the need for work for securing the power supply outside.
[0014]
  Furthermore, as described above, the connection unit of the present invention isIt is installed in a telephone line connecting the telephone office and the above subscriber's house to relay the telephone line inside the house and the outside telephone line.,
  A DC blocking unit is provided that detects that power is supplied from the home telephone line and blocks the DC component from the outside telephone line while allowing the AC component to pass therethrough.
[0015]
With the above configuration, when DC power is supplied from the home phone line, the DC power supplied from the outside phone line is blocked by the DC blocking unit. It is possible to prevent the DC power from colliding.
Further, since the direct current blocking unit blocks only direct current and allows alternating current for transmitting and receiving voice signals and the like to pass therethrough, it is possible to make a call using an analog telephone line.
[0016]
The DC blocking unit includes a DC blocking circuit interposed between the outside telephone line and the inside telephone line;
A bypass circuit that bypasses the DC blocking circuit and connects the outside telephone line and the inside telephone line;
The bypass circuit is provided in the bypass circuit, detects that power is supplied from the home telephone line, and turns off (opens) the bypass circuit, and converts the DC power from the home telephone line to the photoelectric conversion unit and the modem for the telephone line. And a relay circuit that can be switched to supply power to the unit.
[0017]
With the above configuration, when the power supply from the home telephone line is detected, the DC power supplied from the external telephone line is cut off by the DC cut-off circuit by turning off (opening) the bypass circuit by the relay circuit. Can do. At the same time, by switching off (opening) the bypass circuit by the relay circuit, it is possible to supply the DC power supplied through the home telephone line to the photoelectric conversion unit and the telephone line modulation / demodulation unit.
[0018]
A polarity reversing circuit for detecting reversal of the current polarity flowing through the telephone line;
A ringer circuit for detecting a call signal from the outside telephone line;
A hooking dial pulse circuit for generating on-hook, off-hook and dial pulses of a telephone connected to the terminal side of the home telephone line;
When the DC component from the outside telephone line is cut off, the polarity inversion circuit, the ringer circuit and the hooking dial pulse circuit are turned on (closed).
[0019]
With the above configuration, the polarity inversion function, ringing function, hooking function and dial pulse function on the telephone side are stopped when the DC supplied from the outside telephone line is interrupted by the DC cutoff circuit. By providing a circuit, a ringer circuit, and a hooking dial pulse circuit, it becomes possible to provide a conventional telephone function by substituting each function.
[0021]
With the above configuration, analog electrical signals can be transmitted / received to / from the connection unit through the home telephone line, and data can be modulated / demodulated by the telephone line modulation / demodulation unit to exchange digital electrical signals with the information communication device. Then, a DC power supply circuit serving as a power source is provided in the home terminal device, and DC power is superimposed on the home phone line by the DC superimposing circuit, so that DC power is supplied to the connection unit using the existing home phone line. can do.
[0022]
Further, the present invention is a home terminal device connected to the connection unit via the home telephone line,
A telephone line modulation / demodulation unit that performs modulation / demodulation of data by connecting to the residential telephone line side;
A DC supply circuit serving as a power supply source to the connection unit;
A DC superposition circuit that superimposes DC power from the DC supply circuit on the home telephone line superimposed on an AC electrical signal for data communication;
A ringing circuit for sending a telephone ringing signal received through the outside telephone line, the connection unit, and the telephone line to the telephone;
A call / disconnect / dial pulse detection circuit that detects a call / disconnect / dial pulse signal from the telephone and transmits the signal to the connection unit, and is arranged inside the subscriber's house. It provides a home terminal device for optical subscriber lines.
[0023]
With the above configuration, the telephone ringing signal received through the telephone line from the connecting unit connected to the telephone line connected to the telephone station can be transmitted to the telephone side as a ringing signal suitable for the telephone by the ringing circuit.
In addition, since the call signal and the disconnection signal are detected by the call / disconnect / dial pulse detection circuit and transmitted to the home phone line, the call signal and the disconnect signal suitable for the telephone station side at the connection unit The dial pulse can be sent to the outside telephone line.
[0024]
A current limiting circuit for limiting an upper limit value of the current supplied from the DC supply circuit to the home telephone line;
[0025]
It is difficult to fully grasp the laying state of the home phone line for each subscriber, and there is a risk of causing trouble if power is supplied to the home phone line without limitation. For example, a fail-safe function can be provided by limiting the upper limit to 100 mA at DC 48V.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described with reference to the drawings.
  Figure 1referenceThe embodiment is shown and the schematic block diagram in the subscriber house 10 used as the termination | terminus side of the passive optical network (PON: Passive Optical Network) which is an optical subscriber type | system | group communication system is represented. The PON uses a PDS (Passive Double Star) optical data line, and performs access control of single-core bidirectional communication by time division multiplexing or wavelength multiplexing.
[0027]
A connection ONU (Optical Network Unit) 11, which is a connection unit connected by an optical fiber cable O via a star coupler (not shown) and an OLT (Optical Line Terminal) (not shown) installed on the master station side, It is installed outside 10 homes. The connection ONU 11 is connected to the in-home telephone line W1 of the existing telephone lines W1 and W2, but is disconnected from the outside telephone line W2.
A home terminal device 12 is connected to the end of the home telephone line W1, and the home terminal device 12 is connected to the personal computers P1 and P2 by wire or wirelessly and integrates an analog signal and a digital signal. Integrated Access Device) Wirelessly connected to the telephone T via Ta.
[0028]
As shown in FIG. 2, the connection ONU 11 is connected to an optical fiber cable O to perform an O / E / E / O conversion, and a telephone is connected to the photoelectric conversion unit 13 to perform data modulation / demodulation. A line modulation / demodulation unit 14, a hybrid circuit 15 connected to the telephone line modulation / demodulation unit 14 for transmission / reception separation of electrical signals, a DC separation circuit 16 for separating DC power supplied from the home terminal device 12, and a DC separation A power circuit 18 connected to the circuit 16 and driving the photoelectric conversion unit 13 and the telephone line modem unit 14 is provided.
[0029]
The home terminal device 12 includes a DC supply circuit 23 that supplies DC power to the connection ONU 11, a DC superposition circuit 22 that superimposes a DC power source on an analog electric signal for data communication, a DC superposition circuit 22, and a home telephone line. A current limiter circuit 21 that is a limiter that is provided between W1 and that limits a current upper limit value for energization to 100 mA at 48 V DC, a hybrid circuit 24 that performs transmission / reception separation of electric signals, and a telephone line modem unit that performs data modulation / demodulation. 25, a control circuit 26, and a communication circuit 27 serving as a connection interface to a personal computer or the like.
[0030]
Next, the flow of data signals in the connection ONU 11 and the home terminal device 12 will be described.
For the down signal, the optical signal from the optical fiber cable O is O / E converted by the photoelectric conversion unit 13 of the connection ONU 11 to be converted into a digital electric signal, and the digital electric signal is converted by the telephone line modulation / demodulation unit 14 into a modulation signal for the telephone line. Convert to The modulated signal is transmitted downstream by the hybrid circuit 15, and the modulated signal that is alternating current passes through the direct current separating circuit 16 and is transmitted to the home telephone line W1 through the security circuit 17.
[0031]
On the home terminal device 12 side, the modulated signal received from the home telephone line W1 is transmitted through the current limiting circuit 21 and the DC superimposing circuit 22 and transmitted down to the telephone line modem 25 by the hybrid circuit 24. The telephone line modulation / demodulation circuit 25 converts the received modulation signal into a digital electrical signal and transmits it to the control circuit 26. The communication circuit 27 transmits data to the personal computer PC1, PC2 and / or the IAD of the telephone T via a wireless or LAN cable. Send.
Note that the upstream signal is the reverse of the downstream signal flow, and therefore the description thereof is omitted. The data communication through the optical fiber cable O is also used for transmission / reception of voice data signals of IP telephones.
[0032]
Next, the flow of power supply from the home terminal device 12 to the connection ONU 11 will be described.
The home terminal device 12 converts the power obtained from the power outlet of the subscriber's home 10 from AC to DC by the DC supply circuit 23, and the DC superimposing circuit 22 superimposes the DC power on the line where the data signal is transmitted and received. For example, the DC power is sent to the home telephone line W1 through the current limiting circuit 21 when the current upper limit value is DC48V and 100 mA or less, and when exceeded, it is blocked by the current limiting circuit 12. It is not sent to the home phone line W1.
The DC power supplied from the home telephone line W1 to the connection ONU 11 is separated from the line through which data signals are transmitted / received by the DC separation circuit 16 through the safety circuit 17 and supplied to the power supply circuit 18 from the power supply circuit 18 to the photoelectric conversion unit. 13 and the telephone line modem 14 are supplied as drive power.
[0033]
With the above configuration, since the connection ONU 11 having the photoelectric conversion unit that performs O / E / E / O conversion is installed outside the subscriber's home 10, it is not necessary to draw the optical fiber cable O into the subscriber's home 10. At the same time, since the connection ONU 11 can communicate with the home terminal device 12 via the home telephone line W1, there is no need to make a hole in the outer wall of the subscriber home 10 or to enter the subscriber home 10. it can.
In addition, since the operating power of the connection ONU 11 is supplied by sharing the home telephone line W1 that is a signal line between the connection ONU 11 and the home terminal device 12, no work for securing the power supply outside the house is required. it can. In addition, since the home telephone line W1, which is an existing telephone line, is used, the cable can be wired in the subscriber's house 10 without exposing it, so that the appearance is good and the functionality is excellent.
Needless to say, the DC supply unit 23, the DC superimposing circuit 22 and the current limiting circuit 21 built in the home terminal device 12 may be externally attached.
[0034]
  3 to 6 show the first1An embodiment is shown.
  Reference aboveThe difference from the embodiment is that the connection ONU 30 is also connected to the outside telephone line W2.
[0035]
As shown in FIG. 3, the connection ONU 30 is connected to an optical fiber cable O to perform an O / E / E / O conversion, a photoelectric conversion unit 31, and a telephone line that is connected to the photoelectric conversion unit 31 to modulate / demodulate data. Modulation / demodulation unit 32, control unit 33 that controls various circuits, a hybrid circuit 35 that is connected to the telephone line modulation / demodulation unit 32 and transmits / receives and separates electric signals, and an HPF that passes high-frequency components of analog electric signals (High pass filter) 36.
[0036]
Further, at a relay position between the home phone line W1 and the outside phone line W2, a DC cutoff circuit 40 that cuts off DC power supplied from the outside phone line W2 and passes AC, and a DC cutoff circuit 40 The bypass circuit 45 that bypasses the relay circuit R1, the relay circuit R1 that turns the bypass circuit 45 on (closed) and off (open), and the relay telephone R1 that is turned off (open), is electrically connected to the home phone line W1 side and separates and extracts DC power And a power supply circuit 42 that is connected to the DC separation circuit 41 and supplies power to the central processing unit 46 including the photoelectric conversion unit 31, the telephone line modulation / demodulation unit 32, and the control unit 33.
[0037]
On the lower side of the DC separation circuit 40, an LPF (low pass filter) 37 that passes the low-frequency component of the analog electric signal and DC power and a home telephone line W 1 on the lower side of the LPF 37 are branched, and a home terminal to be described later The BPF (band pass filter) 38 that passes a specific frequency component transmitted from the device 50, and the opening / closing drive of the relay circuit R1 are controlled by a signal that has passed through the BPF 38. A relay signal detection / drive / loopback circuit 39 is provided to send back to the device 50 side.
[0038]
On the upper side of the DC separation circuit, a polarity / ringer detection circuit 44 that detects reversal of the polarity of the current flowing through the telephone lines W1 and W2 and detects a call signal from the outside telephone line W2, and a home termination described later Hooking dial pulse circuit 43 for generating on-hook and off-hook dial pulses of a telephone connected to the terminal side of device 50, and a relay circuit for turning on / off conduction between hooking dial pulse circuit 43 and outside telephone line W2 R2 and a relay circuit R3 for turning on / off the conduction between the polarity / ringer detection circuit 44 and the outside telephone line W2.
[0039]
Next, as shown in FIG. 4, the home termination device 50 includes a DC supply circuit 53 that supplies DC power to the connection ONU 30, and a DC superposition circuit 52 that superimposes a DC power supply on the electrical signal for data communication. A current limiting circuit 31 provided between the DC superimposing circuit 52 and the home telephone line W1 for limiting the energized current limit to, for example, 100 mA at 48 V DC, and an HPF (high pass filter) that allows a high frequency component of the analog electric signal to pass through. ) 54, a hybrid circuit 55 that performs transmission / reception separation of electric signals, a telephone line modulation / demodulation unit 56 that modulates and demodulates data, a control circuit 59 that controls various circuits, and a communication that serves as a connection interface to a personal computer or the like Circuit 63.
[0040]
Further, a low-pass filter (LPF) 60 that passes through a low-frequency component and a DC component that are branched and connected on the upper side of the HPF 54 and an incoming call signal that is connected to the lower side of the LPF 60 and received from the connection ONU 30 are detected and the telephone set. A ringing circuit 61 for sending an incoming call signal conforming to the above, a call / disconnect signal connected to a lower level of the ringing circuit 61, a call / disconnect signal to the connection ONU 30 through the control circuit 59 by detecting a dial pulse, A calling / disconnecting / dial pulse detecting circuit 62 for transmitting a dial pulse is provided.
The call / disconnection / dial pulse detection circuit 62 is connected to the telephone by a cable W3 via a relay circuit R4, and the communication between the call / disconnection detection circuit 62 and the telephone is turned off (opened) by the relay circuit R4. In this case, a bypass circuit 64 that bypasses the ringing circuit 61 and the call / disconnect detection circuit 62 and connects the cable W3 and the LPF 60 is provided.
[0041]
Also, a BPF (band pass filter) 57 that passes a specific frequency component branched and connected on the upper side of the HPF 54, and a relay signal detection / drive / loopback circuit 39 of the connection ONU 30 that is connected to the lower side of the BPF 57, The relay signal transmission / reception part 58 which transmits / receives a signal between is provided.
[0042]
Next, the flow of signals in the connection ONU 30 and the home terminal device 50 in data communication through the optical fiber cable O will be described.
For the down signal, the optical signal from the optical fiber cable O is O / E converted by the photoelectric conversion unit 31 of the connection ONU 30 to be converted into a digital electric signal, and the digital electric signal is converted into a high-frequency modulation signal by the telephone line modulation / demodulation unit 32. To do. The modulated signal is transmitted downstream by the hybrid circuit 35 and transmitted through the HPF 36 to the home telephone line W1.
In the home terminal device 50, the modulated signal received from the home phone line W 1 is passed through the current limiting circuit 51 and the DC superimposing circuit 52, passes through the HPF 54, and is transmitted to the telephone line modem 56 by the hybrid circuit 55. Is done. The telephone line modulation / demodulation circuit 56 demodulates the received modulation signal into a digital electric signal and transmits it to the control circuit 59, and transmits data to the personal computer from the communication circuit 63 via a wireless or LAN cable.
As for the upstream signal, the description is omitted because it is just the reverse of the downstream signal flow. The data communication through the optical fiber cable O is also used for transmission / reception of voice data signals of IP telephones.
[0043]
Next, the flow of power supply from the home terminal device 50 to the connection ONU 30 will be described.
First, when power is supplied to the home terminal device 50, as shown in FIG. 4, the control circuit 59 transmits a notification signal notifying the start of power supply to the home telephone line W1 from the relay signal transmitting / receiving unit 58. The notification signal is a signal of a set frequency that the BPF 58 and the BPF 38 pass, and is received by the relay signal detection / drive / loopback circuit 39 of the connection ONU 30 and relays from the state shown in FIG. 3 to the state shown in FIG. The circuit R1 is switched.
[0044]
Then, the relay signal detection / drive / loopback circuit 39 loops back and sends a completion notification notifying that the switching of the relay circuit R1 is successful to the home telephone line W1. The home terminal device 50 receives the completion notification through the BPF 57 by the relay signal transmission / reception unit 58, and a trigger signal for starting power supply is transmitted from the control circuit 59 to the DC supply circuit 53, and the relay circuit R4 is connected to the relay circuit R4 in FIG. Switch to state.
[0045]
The DC supply circuit 53 converts the power obtained from the power outlet at the subscriber's home from AC to DC and supplies the DC superimposing circuit 52 with power, and the DC superimposing circuit 52 superimposes DC power on the line where data signals are transmitted and received. To do. The DC power is sent to the home telephone line W1 through the current limiting circuit 51 when the current upper limit value is, for example, DC48V and 100 mA or less, and when it exceeds that, the DC power is cut off by the current limiting circuit 51. It is not sent to the home phone line W1.
The DC power supplied from the home telephone line W1 to the connection ONU 30 passes through the LPF 37, is separated into DC components by the DC separation circuit 41 via the bypass circuit 45 and the relay circuit R1, and is supplied to the power supply circuit 42. Thus, power is supplied to the central processing unit 46, and the relays R2 and R3 are turned on (closed) as shown in FIG.
[0046]
Next, a description will be given of a flow when an incoming analog phone call is received in a state where power is supplied from the home terminal device 50 to the connection ONU 30.
As shown in FIG. 5, an incoming call signal from the outside telephone line W 2 is detected by the polarity / ringer detection circuit 44, and the incoming call detection signal is transmitted to the control unit 33. An incoming call signal is transmitted from the control unit 33 to the home telephone line W1 in the order of the telephone line modulation / demodulation unit 32 → the hybrid circuit 35 → the HPF 36.
In the home terminal device 50, as shown in FIG. 6, the incoming call signal flows in the order of current limiting circuit 51 → DC superposition circuit 52 → HPF 54 → hybrid circuit 55 → telephone line modem unit 56. The ringing signal 61 is demodulated by 56 and transmitted to the cable W3 via the control circuit 59 and to the cable W3.
[0047]
When the handset of the telephone connected to the terminal side of the cable W3 is lifted to be in an off-hook state, an off-hook signal is generated by the call / disconnect / dial pulse detection circuit 62 → the control circuit 59 → the telephone line modulation / demodulation unit 56 → the hybrid circuit. 55 → HPF 54 → DC superposition circuit 52 → current limiting circuit 51 → home phone line W1 → HPF 36 → hybrid circuit 35 → telephone line modulation / demodulation unit 32 → control unit 33 → hooking dial pulse circuit 43 An off-hook signal suitable for the telephone station side is sent to the outside telephone line W2 so that a call can be made. A voice signal (AC) during a call flows from the outside telephone line W2 through the DC blocking circuit 40 to the inside telephone line W1, and in the home terminating device 50, the current limiting circuit 51 → DC superposition circuit 52 → LPF 60 → Ringing circuit 61 → calling / disconnecting / dial pulse detection circuit 62 → cable W3 flows to the telephone and can talk. Polarity inversion for notifying billing information during a call is detected and output by a polarity / ringer detection circuit 44.
[0048]
Next, a flow at the time of outgoing of an analog telephone in a state where power is supplied from the home terminal device 50 to the connection ONU 30 will be described.
When the telephone handset is lifted and is in an off-hook state, an off-hook signal is generated by the call / disconnect detection circuit 62 → control circuit 59 → telephone line modulation / demodulation unit 56 → hybrid circuit 55 → HPF 54 → DC superposition circuit 52 → current limiting circuit 51 → home Telephone line W1 → HPF 36 → Hybrid circuit 35 → Telephone line modulation / demodulation unit 32 → Control unit 33 → Hooking dial pulse circuit 43 is transmitted, and an off-hook signal is sent to the outside telephone line W2, and an off-hook sound is generated in the telephone. Is done.
[0049]
Similarly, when the destination number is dialed, the calling / disconnecting / dial pulse detection circuit 62 → control circuit 59 → telephone line modulation / demodulation unit 56 → hybrid circuit 55 → HPF 54 → DC superposition circuit 52 → current limiting circuit 51 → When the home telephone line W1 → HPF 36 → hybrid circuit 35 → telephone line modulation / demodulation unit 32 → control unit 33 → hooking dial pulse circuit 43 is transmitted, the calling signal is sent to the outside telephone line W2 and the other party leaves. The voice signal (alternating current) passes from the outside telephone line W2 through the direct current cut-off circuit 40 to the in-home telephone line W1 and can make a call.
[0050]
When the telephone handset is put on the hook state, the disconnection signal is transmitted to the calling / disconnecting / dial pulse detecting circuit 62 → control circuit 59 → telephone line modulation / demodulation unit 56 → hybrid circuit 55 → HPF 54 → DC superposition circuit 52 → current. The restriction circuit 51 → home telephone line W1 → HPF 36 → hybrid circuit 35 → telephone line modulation / demodulation unit 32 → control unit 33 → hooking dial pulse circuit 43 is transmitted, and the call termination is sent to the external telephone line W2.
[0051]
Next, a signal flow in a state where power supply from the home terminal device 50 to the connection ONU 30 is stopped and only an analog telephone can be used will be described.
When the power supply from the home terminal device 50 is stopped, the relay circuit R1 of the connection ONU 30 is in the state shown in FIG. 3, and the relay circuit R4 of the home terminal device 50 is in the state shown in FIG. It has become.
[0052]
That is, between the outside telephone line W2 and the cable W3 connected to the telephone, the downside telephone line W2 → bypass circuit 45 → LPF 37 → inside telephone line W1 → current limiting circuit 51 → DC superposition circuit 52 → Energization is performed in the flow of LPF 60 → bypass circuit 64 → cable W3. (The reverse is the reverse)
Therefore, even if the power supply to the home terminal device 50 and the connected ONU 30 is stopped when the power of the home terminal device 50 is not turned on or in the event of a power failure, the conventional analog telephone can be used. It is secured.
[0053]
  FIG.2An embodiment is shown.
  First1The difference from the embodiment is that the connection position of the bypass circuit 45 ′ of the connection ONU 30 ′ is changed. (The home terminal device 50 is1The same as in the embodiment. )
[0054]
The bypass circuit 45 'bypasses not only the DC cutoff circuit 40 but also the hooking / dial pulse circuit 43 and the polarity / ringer detection circuit 44, and the bypass circuit 45' is connected to the upper side of the bypass circuit 45 'and the outside telephone line W2. A relay circuit R5 is provided at the connection portion.
When power is not supplied to the connection ONU 30 ′ from the home terminal device via the home telephone line W1, the bypass circuit 45 ′ is closed by the relay circuits R1 and R5 as shown in FIG. Outside telephone line W2 → Bypass circuit 45 ′ → LPF 37 → Home telephone line W1 → Current limiting circuit 51 → DC superimposing circuit 52 → LPF 60 → Bypass circuit 64 → Allowed to make an analog telephone by the flow of cable W3. Yes.
[0055]
  On the other hand, when power is supplied to the connection ONU 30 ′ from the home terminal device via the home phone line W 1,1Similarly to the embodiment, the relay circuit R1 is switched by the relay signal detection / drive / loopback circuit 39 to turn off (open) the bypass circuit 45 ', and the relay circuit R5 is switched to connect to the outside telephone line W2. The polarity / ringer detection circuit 44, the hooking / dial pulse circuit 43, and the DC cutoff circuit 40 are energized.
  Other configurations are1Since it is the same as that of embodiment, description is abbreviate | omitted.
[0056]
【The invention's effect】
  As is apparent from the above description, according to the present invention, a connection unit including an optoelectric conversion unit that performs O / E / E / O conversion is provided to a subscriber.Outdoor such as the outer wall of the houseInstallWhenThe optical fiber cable does not need to be pulled into the subscriber's home, and the connection unit can communicate with the home terminal device via the home phone line. Therefore, it is necessary to make a cable insertion hole in the outer wall of the subscriber's home. Eliminates the need for on-site construction. In addition, since the operating power of the connection unit is supplied from the inside of the house using a home telephone line that is a signal line between the connection unit and the home terminal device, it is possible to eliminate the need to secure power outside the house. .
[Brief description of the drawings]
FIG. 1 of the present inventionreference1 is a configuration diagram of an optical subscriber line wiring system according to an embodiment. FIG.
[Figure 2]referenceIt is a circuit block diagram of the connection unit and home terminal device of an embodiment.
[Figure 3]1It is a circuit block diagram of the connection unit of embodiment.
FIG. 41It is a circuit block diagram of the home termination apparatus of embodiment.
FIG. 51It is the circuit block diagram by which the relay circuit of the connection unit of embodiment was switched.
FIG. 61It is the circuit block diagram by which the relay circuit of the home termination apparatus of embodiment was switched.
FIG. 72It is a circuit block diagram of the connection unit of embodiment.
FIG. 8 is a diagram showing a conventional example.
[Explanation of symbols]
10 Subscriber's house
11, 30 Connection ONU (connection unit)
12, 50 Home terminal equipment
13, 31 Photoelectric converter
14, 32, 56 Telephone line modem
15, 24, 35, 55 Hybrid circuit
16, 41 DC separation circuit
18, 42 Power circuit
21, 51 Current limit circuit
22, 52 DC superposition circuit
23, 53 DC supply circuit
26, 59 Control circuit
27, 63 Communication circuit
39 Relay signal detection / drive / loopback circuit
40 DC cutoff circuit
43 hooking dial pulse circuit
44 Polarity / Ringer detection circuit
45, 64 Bypass circuit
61 Ringing circuit
62 Calling / disconnecting / dial pulse circuit
R1, R2, R3, R4 Relay circuit
O Optical fiber cable
T telephone
W1 Home phone line
W2 Outside phone line

Claims (4)

Installed in the subscriber's home, connected to the optical fiber cable wired from the master station to the subscriber's home, and interposed in the telephone line connecting the subscriber's home and the telephone station, A connection unit that relays
The connection unit is connected to an optical fiber cable to perform an O / E / E / O conversion;
A telephone line modulation / demodulation unit that is connected to the photoelectric conversion unit on one side and connected to the telephone line side on the other side to modulate / demodulate data;
DC power supplied from the power source in the subscriber's home through the home telephone line is separated, and a DC separator for supplying power to the photoelectric converter and the telephone line modem is provided.
In addition, a DC blocking unit that detects that power is supplied from the in-house telephone line and blocks the DC component from the outside telephone line while allowing an AC component to pass therethrough is provided. An optical subscriber line connection unit . The DC blocking unit includes a DC blocking circuit interposed between the outside telephone line and the inside telephone line;
A bypass circuit that bypasses the DC blocking circuit and connects the outside telephone line and the inside telephone line;
The bypass circuit is provided in the bypass circuit, detects that power is supplied from the home telephone line, and turns off (opens) the bypass circuit, and converts the DC power from the home telephone line to the photoelectric conversion unit and the modem for the telephone line. The optical subscriber line connection unit according to claim 1, further comprising: a relay circuit that can be switched to supply power to the unit . A polarity reversing circuit for detecting reversal of the current polarity flowing through the telephone line;
A ringer circuit for detecting a call signal from the outside telephone line;
A hooking dial pulse circuit for generating on-hook, off-hook and dial pulses of a telephone connected to the terminal side of the home telephone line;
3. The polarity inversion circuit, the ringer circuit, and the hooking dial pulse circuit are turned on (closed) when a DC component from the outside telephone line is cut off. Optical subscriber line connection unit. A home termination device connected to the connection unit according to any one of claims 1 to 3 via the home telephone line,
A telephone line modulation / demodulation unit that performs modulation / demodulation of data by connecting to the residential telephone line side;
A DC supply circuit serving as a power supply source to the connection unit;
A DC superposition circuit that superimposes DC power from the DC supply circuit on the home telephone line superimposed on an AC electrical signal for data communication;
A ringing circuit for sending a telephone ringing signal received through the outside telephone line, the connection unit, and the telephone line to the telephone;
A call / disconnect / dial pulse detection circuit that detects a call / disconnect / dial pulse signal from the telephone and transmits the signal to the connection unit, and is arranged inside the subscriber's house. A terminating device for optical subscriber lines.

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