JP2636600B2 - Data transmission system and communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a point-to-multipoint transmission system, which sets a burst signal transmission timing from a multipoint, controls a signal output level between communication devices, and a variable gain amplifier for a signal reception circuit of the communication device. The present invention relates to a circuit gain control device.

[0002]

2. Description of the Related Art FIGS. 8, 9 and 10 show, for example, IE
EE JOURNAL OF LIGHTWAVE T
ECHNOLOGY. VOL. 7. NO. 11. NOV
FIG. 7 is a diagram for explaining the conventional communication device shown on pages 1741 to 1751 of EMBER 1989. FIG. 8 is a network configuration diagram. In the figure, 81 is a telephone office, 82 is a passive optical branch circuit, 83 is a passive optical branch circuit, and 84 is a user's home. FIG. 9 is a system configuration diagram, in which 85 is an intra-office device in the telephone office 81,
86 is a network adapter, 87 is a bit transmission system on the local device side, 88 is an optical interface circuit, 89 is an optical fiber network, 90 is a home device in the user home 84, 91 is an optical interface circuit, and 92 is a bit transmission system on the home device side. , 93 are network termination circuits. FIG. 11 is a diagram showing a frame configuration, in which 103 is an area for maintenance / synchronization and uplink arrangement, 104 is a basic frame, 105 is a transmission bit, 106 is a management bit,
107 is an auxiliary bit. FIG. 10 is a configuration diagram of the intra-office device side bit transmission system 87 and the in-home device side bit transmission system 92. In FIG. 10, reference numeral 94 denotes a downstream frame generation circuit of the intra-station device bit transmission system 87, 95 denotes a transmission delay measurement circuit, 96 denotes a pulse detection circuit, and 97 denotes an upstream reception termination circuit of the intra-office device bit transmission system 87. , 98 are a receiving termination circuit in the down direction of the in-home device side bit transmission system 92, 99 is a memory,
00 is a pulse transmission circuit, 101 is a transmission timing setting circuit, 102 is an uplink frame generation circuit, A is downlink data, B is uplink data, C is an in-station apparatus side pulse transmission command, M is a transmission frame head phase, N is a transmission delay amount, 0 is a detection pulse, P is a pulse signal for sending a pulse to the home device,
Q is the transmission delay amount, and R is the transmission timing from the memory.

Next, a conventional example will be described with reference to FIGS. 9, 10 and 11. FIG. The in-station device 85 of the telephone office 81
Located on the point side of point / multipoint transmission,
It comprises a network adapter 86, an intra-office device side bit transmission system 87, and an optical interface circuit 88.
The interface with the exchange is a network adapter 86
The interface with the optical fiber network 89 is performed via an optical interface circuit 88. The home device 90 of the user home 84 is located on the multipoint side (home device side), and the optical interface circuit 91,
It is composed of a home device side bit transmission system 92 and a network termination circuit 93. Optical fiber network 89
The interface with the terminal device is performed via an optical interface circuit 91, and the interface with the terminal device is performed via a network termination circuit 93.

[0004] As shown in FIG. 10, an intra-station-unit-side bit transmission system 87 uses a frame generation circuit 94 in FIG.
The frame shown in is generated. The frame includes a maintenance / synchronization bit 103 and a plurality of basic frames 104. The basic frame further includes a transmission bit 105, a management bit 106, and an auxiliary bit 107. The maintenance / synchronization bit 103 exists only in the down direction, and becomes a no-signal area in the up direction. The frame generation circuit 94 requests the home device 90 of any user to transmit a transmission delay measurement pulse or pattern using the management bit 106 in accordance with the pulse transmission command C. Home device side bit transmission system 92
Detects the basic frame allocated by the reception termination circuit 98, and when a transmission delay measurement pulse or pattern transmission is requested by the management bit 106, an arbitrary bit from the leading phase of the downlink reception frame is transmitted by the pulse transmission command P. A pulse or a pattern O for transmission delay measurement having a width is transmitted from the pulse transmission circuit 100. The intra-station-unit-side bit transmission system 87 detects a transmission delay measuring pulse or pattern O in a pulse detection circuit 96, compares the detected pulse or the pattern O with the head phase M of a downstream frame, and measures a transmission delay amount N by a transmission delay measurement circuit 95. At the same time, the reception termination circuit 97 terminates the upstream signal from each home device. Or transmission measurements of delay to complete the to the transmission delay amount N write normal downlink frame to the management bit 106 of the base frame temple allocated to each home device ends as. Held at customer premises in the apparatus detects the transmission delay amount Q that is written to the management bit 106 of the base frame allocated Terra memory 99, at transmission timing setting circuit 101 on a frame generated by the frame generation circuit 102 The transmission timing R corresponding to the transmission delay amount is added to complete the basic frame in the uplink direction, and normal point-multipoint transmission is performed without interference with other users.

[0005]

Since the conventional communication apparatus is configured as described above, the in-home-apparatus-side bit transmission system 92 requires a memory for holding the transmission delay amount and a component associated therewith. There was a problem. Also, the conventional signal transmission circuit of a communication device outputs a constant signal output level regardless of the transmission distance, so that low power consumption of the signal transmission circuit cannot be expected, and the reception circuit of the communication device requires a large dynamic range. There was a problem to do. Further, the conventional gain control of the signal receiving circuit of the communication device gives feedback control to the variable gain amplifier circuit so that the signal level after amplification approaches a target value, so that the response time is long and complicated control is required. There was a point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a good point-to-multipoint transmission without requiring a memory for holding a transmission delay amount in a bit transmission system on the user premises equipment side. Is provided. Further, a signal transmission circuit of a communication device provides a signal output level control device capable of reducing power consumption and reducing a dynamic range of a reception signal required for a communication device signal reception circuit. Furthermore, a signal receiving circuit of a communication device does not perform complicated feedback control by a variable gain amplifier circuit, and provides a gain control device capable of shortening a response time.

[0007]

In order to solve the problems] engagement Ru data heat transfer to the present invention
The transmission system transmits the transmission delay amount to the point-side communication device.
Transmission of measurement signals used for
Request signal transmitting means for transmitting a request signal requesting a communication device
And the measurement signal transmitted from the multipoint side communication device.
Measuring means for receiving a signal and measuring a transmission delay amount;
Sign to the phase according to the transmission delay measured by the measuring means
The signal with the violation is sent to the multipoint communication device.
Transmission delay means for transmitting, the multi-point side
A request signal transmitted from the request signal transmitting means to the communication device;
A measuring signal transmitting means for transmitting a measuring signal in accordance with
Transmission rule
Of the frame to be detected and transmitted to the point side communication device.
Timing setting means for setting transmission timing.
It is a thing.

Further , a data transmission system according to the present invention
Are both the point-side communication device and the multipoint-side communication device.
And the point-side communication device and the multipoint
Data communication is performed between the communication devices on the client side,
This point-side communication device uses the measurement used for phase measurement.
Request the transmission of the fixed signal from the multipoint communication device
Request signal transmitting means for transmitting a request signal
Receiving the measurement signal transmitted from the communication device
Where the phase of the measurement signal is divided into arbitrary regions.
Phase region detection to detect which region in the phase adjustment region belongs
Output means and an area detected by the phase area detection means.
Is transmitted to the multipoint-side communication device.
Phase signal transmitting means for
The communication device transmits the request transmitted from the request signal transmitting unit.
Transmitting the measurement signal in accordance with the signal
Means and a phase signal transmitted from the phase signal transmitting means
Frame to be transmitted to the point-side communication device based on
Timing setting means for setting the transmission timing of the
The point-side communication device further includes
Until the measured phase difference reaches the optimum value.
Transmission of the request signal from the signal transmission means.
is there.

[0009] A communication device according to the present invention provides a communication destination.
Transmitting means for transmitting a data signal to the device;
Control means for controlling the transmission output level of each stage,
Detection means for detecting the amount of transmission delay between the
That is, the control means detects
Controlling the transmission output level according to the transmission delay amount
Things.

[0010] A communication device according to the present invention is a communication device of a transmission source.
Receiving means for receiving a data signal from the device;
Control means for controlling the reception level and whether the communication device is the transmission source
Detection means for detecting the amount of transmission delay of a signal transmitted from
The control means comprises a transmission detected by the detection means.
The reception level is controlled according to the delay amount.

[0011]

The communication device according to the present invention notifies each multipoint of the amount of transmission delay by adding a coding rule violation (CRV) to the phase reflecting the amount of transmission delay of each multipoint during the downstream transmission frame. As a result, each multipoint transmits an upstream burst signal at an appropriate timing.

In the communication apparatus according to the present invention, for a phase adjustment pattern transmitted by an arbitrary multipoint designated by a point, the point is compared with an optimum reception phase to "advance" the reception phase of the phase adjustment pattern. , “Delay” or “match” is determined. The multipoint notified of the determination result repeatedly adjusts the transmission timing of the phase adjustment pattern so that the point obtains the optimum reception phase.

The transmission distance is recognized based on the transmission delay amount recognized by the communication device, and the control circuit controls the signal output level of the signal transmission circuit in accordance with the signal level attenuation resulting from the recognition.

The gain control device recognizes the transmission distance based on the transmission delay amount recognized by the communication device, and performs control for variably setting the amplification gain of the received signal in accordance with the signal level attenuation resulting therefrom.

[0015]

[Embodiment 1] Hereinafter, embodiments of the present invention will be described. The point corresponds to the station side, and the multipoint corresponds to the user premises equipment or terminal, and adopts a time-division directional control transmission method in which bidirectional transmission is time-divisionally performed on one transmission path. FIG. 1 is a block diagram of a communication apparatus according to an embodiment of the present invention, and shows a configuration of a system corresponding to the intra-office apparatus side bit transmission system 87 and the in-home apparatus side bit transmission system 92 shown in FIG.
In the figure, reference numeral 26 denotes an intra-station-unit-side bit transmission system according to the present invention, 2 a frame generation circuit for generating a frame for downlink data, 3 an encoding circuit, and 4 a CRV setting circuit for adding a CRV to downlink data. 5 is a measurement of the transmission delay from the head phase of the downlink data to the uplink data.
A transmission delay measuring circuit for detecting a transmission delay up to a regular pulse or a pattern leading phase, a pulse detecting circuit 6 for detecting a leading phase of uplink data, a receiving terminating circuit 7 for terminating an uplink frame, and a decoding circuit 8 Circuit. 2
7 is a bit transmission system at the home device side to which the present invention is applied,
Reference numeral 10 denotes a decoding circuit, 11 denotes a reception terminating circuit for terminating a downlink frame, 12 denotes a CRV detection circuit that detects a CRV in downlink data, and 13 denotes a time slot previously assigned to the home device 90 of each user. A basic frame setting circuit for setting a basic frame in the uplink direction, a transmission timing detection circuit for detecting a transmission timing of uplink data from the detected CRV, and a pulse transmission for transmitting a transmission delay measurement pulse or pattern at the time of transmission delay measurement. A transmission circuit 16; a transmission timing setting circuit 16; a frame generation circuit 17 for generating a frame for uplink data; and an encoding circuit 24. FIG. 2 shows a frame configuration of a communication apparatus according to an embodiment of the present invention. Reference numeral 18 denotes a maintenance / synchronization bit in the downlink direction and a non-signal arrangement area in the uplink direction; 19, a basic frame; CRV pulse that exists only in the direction, 21 is a bit for transmission,
Reference numeral 22 denotes a management bit, and reference numeral 23 denotes an auxiliary bit which is a no signal in uplink data.

Next, the operation will be described with reference to FIGS. In FIG. 1, the intra-station device bit transmission system 26 generates the frame shown in FIG. 2 in the frame generation circuit 2 and encodes the frame in the encoding circuit 3. The frame generation circuit 2 requests transmission of a transmission delay measurement pulse or pattern using the management bit 22 allocated to the home device 90 of an arbitrary user by the pulse transmission command c. Home device side bits transmission system 27 is decrypted by the decoding circuit 10 the received data, it detects the base frame 19 assigned thereto by the receiving terminal circuit 11. When a transmission delay measurement pulse or a pattern is requested to be transmitted to the management bit 22 in the detected basic frame 19, a transmission delay measurement pulse or an arbitrary bit width from the leading phase of the downlink reception frame is transmitted by the pulse transmission command g. The pattern is sent from the pulse sending circuit 15. Station apparatus side bits transmission system 26 Goshi restored in the decoding circuit 8 the uplink data, but terminates at the receiving end circuit 7 detects a pulse or pattern for transmission delay measurement in the pulse detection circuit 6 at the same time, downlink frame The transmission delay amount f is measured by the transmission delay measuring circuit 5 in comparison with the leading phase d. When the measurement of the transmission delay of each in-home device is completed as described above, the CRV is set by the CRV setting circuit 4 to a phase that reflects the amount of transmission delay f from the leading phase of the basic frame 19 for each in-home device in the downstream frame. Is set.
The phase of the CRV indicates the transmission timing at which the frames of the respective upstream burst signals are optimally transmitted without interfering with each other at the in-house device reception point when viewed from each home device.

In each in-home device 90, the CRV detection circuit 12 detects the CRV, detects the amount of transmission delay f based on the phase thereof, sets the basic frame to be transmitted, and compares the detected CRV with the upstream data. (14) The transmission timing i is input to the transmission timing setting circuit 16. The upstream data is subjected to necessary adjustment of the output frame of the frame generation circuit 17 by the transmission timing i in the transmission timing setting circuit 16 and transmitted to the encoding circuit 24. With the above operation, even in a multi-star connected network composed of passive nodes, it is possible to notify each user's home device of the data transmission timing and provide point-to-multipoint transmission without mutual interference.

In the first embodiment, an optical fiber network is used. However, a metallic cable network may be used.

Also, the present invention can be applied to the case where the same transmission path is used for uplink and downlink communication and the case where different transmission paths are used.

Embodiment 2 FIG. Next, an embodiment according to claim 2 will be described. A time-division directional control transmission method in which bidirectional transmission is performed in a time-division manner on one transmission line of a network is adopted. FIG. 3 is a block diagram showing an embodiment of the present invention relating to a system corresponding to the intra-station device bit transmission system 87 shown in FIG.
Reference numeral 8 denotes an intra-office device side bit transmission system according to the present invention;
Reference numeral 4 denotes a frame generation circuit for generating a frame for the downlink data transmission signal; 35, an encoding circuit for transcoding the downlink transmission frame signal; and 36, a transmission circuit for performing electrical / optical conversion of the encoded transmission frame signal. , 37 are receiving circuits for performing optical / electrical conversion of optical signals from the multipoint,
Decoding circuitry for decoding the uplink reception frame signal 38, the frame termination circuit for terminating the uplink frame signal decrypted is 39, 40 pattern detecting circuit for detecting a phase adjustment pattern from multipoint, Reference numeral 41 denotes a determination circuit that compares the detected area with the phase adjustment area and determines the reception phase of the pattern. FIG. 4 shows FIG.
Of the home device side bit transmission system 29 according to the embodiment of the present invention.
42 is a receiving circuit for performing optical / electrical conversion of a downstream optical signal from a station device, 43 is a decoding circuit for decoding a downlink received frame signal, and 44 is a decoding circuit for decoding the decoded received frame signal. Terminating frame termination circuit, 45
Is a phase control circuit that performs phase control using control bits in the basic frame allocated to the multipoint, 46 is a phase adjustment pattern transmission circuit that transmits a phase adjustment pattern in accordance with an instruction from the station device, and 47 is uplink transmission. A burst generation circuit for generating a burst signal with respect to the signal, an encoding circuit 48 for transcoding the transmission burst signal, and a transmission circuit 49 for electrically / optically converting the encoded transmission burst signal and transmitting an optical signal. .

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. 3, 4 and 5. FIG. FIG. 5 shows a time-division multiplexed downlink frame 51 and a burst signal 56 in which each multipoint is transmitted to a preset time slot.
Are shown in the upward direction. The downlink frame 51 includes a preamble, a frame pattern, a frame bit 52 including a management bit, a basic frame 53 allocated to each multipoint including a data bit and a control bit, and a non-signal phase adjustment area 54.
Consists of The non-signal phase adjustment region 5
4, a phase adjustment pattern 55 composed of a preamble from an arbitrary multipoint and a unique word or an identification number during a phase adjustment period exists with a phase difference due to an arbitrary transmission line delay. Pattern 55
The reception determination phase 57 for comparing the phase with the reception determination phase 57 is set. The reception determination phase 57 is an optimal reception phase of a signal from the home device 90. The frame in the upstream direction includes a burst signal 56 from a multipoint, and is composed of a preamble, a frame pattern, and control bits.

The in-station device 85 instructs the in-home device side bit transmission system 29 to transmit the phase adjustment pattern 55 using the control bits in the basic frame 53 of the downstream frame 51 for the arbitrary in-home device 90.

When the in-home device side bit transmission system 29 separates the basic frame 53 by the frame terminating circuit 44 and detects the instruction ss from the in-station device 85, it instructs the phase adjustment pattern sending circuit 46 to send the phase adjustment pattern 55. Then, after receiving the last basic frame 53 of the received downlink frame 51, a phase adjustment pattern tt of the phase adjustment pattern tt is transmitted after a predetermined time so that the transmission phase adjustment pattern does not overlap the received optical signal nn at the multipoint receiving point. Send out.

In the local station side bit transmission system 28, the phase adjustment pattern 55 is detected from the home equipment 90 by monitoring the phase adjustment area 54.
Performed with 0. The detection phase kk of the pattern is determined by
The delay is determined by the transmission path delay between the home device 90 and the home device 90. However, when there is no transmission delay, the determination
Reception determination phase 57 which becomes the optimal reception phase received at 5
LL (delay determination signal), mm (lead determination signal)
Is set in the control bit in the basic frame corresponding to the home device 90, and the home device side bit transmission system 29 is notified.

The phase control circuit 45 of the bit transmission system 29 on the home side detects the judgment result of "advance", "delay" and "coincidence" based on the control bits in the basic frame, and the judgment result is LL or mm. Depending on this, the transmission timing of the phase adjustment pattern 55 is moved forward or backward by an arbitrary fixed phase, and transmitted to the intra-office device 85 again via the delay adjustment pattern transmission circuit 46 to be transmitted to the intra-office device 85.
Wait for the judgment result from. This series of adjustments is performed by the in-station device 85.
The phase control circuit 45 of the home-apparatus side bit transmission system 29 recognizes the optimum transmission phase vv of the uplink burst signal by repeatedly performing until the determination result of “match” is obtained. By the above operation, in the multi-star connected network composed of the passive nodes, the burst data from each user's home 84 is transmitted to the telephone station 8 at the receiving point.
1 can provide good point-to-multipoint transmission without interfering with each other.

In the second embodiment, the transmission timing of the phase adjustment pattern 55 of the in-home device 90 is adjusted only by a fixed fixed phase.
An arbitrary adjustment amount may be increased or decreased at a time by further dividing the phase adjustment area 54 for detecting the phase adjustment pattern 55 from 0 into any area.

Further, in the second embodiment, the phase adjustment area 54 is fixedly assigned to the downlink frame signal. However, the in-home device 90 is used to transmit the uplink burst signal during the phase adjustment period. By allocating the area to the phase adjustment area of each in-home device 90, the phase adjustment area 54 of the downlink frame signal can be deleted, and the time space can be effectively used.

Although this communication system is constituted by an optical fiber network, it may be a network of a metallic cable.

Also, the present invention can be applied to the case where the same transmission path is used for uplink and downlink communication and the case where different transmission paths are used.

Embodiment 3 FIG. Next, an embodiment according to claim 3 will be described. FIG. 6 is a block diagram showing an embodiment of a light output level control device according to the present invention. Reference numeral 61 denotes a light emitting element driving circuit for generating a driving current for the light emitting element, 62 denotes a light emitting element, and 63 denotes a light output level fluctuation. The output stabilization circuit 64 to be removed is a drive current control circuit of the present invention.

Next, the operation of one embodiment of the optical output level control device will be described with reference to FIG. The transmission signal T is input to the light emitting element driving circuit 61 and is converted into a driving current U for driving the light emitting element 62. The light emitting element 62 sends out the optical output signal V. The output stabilizing circuit 63 monitors the optical output signal V and controls the light emitting element driving circuit 61 so as to eliminate fluctuations in the output level. At the same time, the drive current control circuit 64 converts the transmission distance detection signal X corresponding to the transmission delay amount recognized by the in-home device 90 into a drive current control signal Y, and controls the light emitting element drive circuit 61 to thereby control the drive current. The light output level V is set via U. By the above operation, the dynamic range of the optical receiving circuit of the in-station device can be reduced, and the power consumption of the optical transmitting circuit of the in-home device can be reduced.

In the third embodiment, the control is applied to the drive current U of the light emitting element. However, the output level may be controlled by inserting an optical attenuator into the fixed level optical output signal.

Embodiment 4 FIG. Next, an embodiment according to claim 4 will be described. FIG. 7 is a block diagram showing an embodiment of a gain control device according to the present invention, wherein 71 is a light receiving circuit for converting an optical input signal into an electric signal, 72 is a variable gain amplifying circuit for amplifying a weak electric signal, and 73 is This is a gain control circuit that sets a gain in the variable gain amplifier circuit 72 according to the transmission distance.

Next, the operation of the embodiment of the gain control device will be described with reference to FIG. The light input signal α is converted by the light receiving circuit 71 into a light receiving electric signal β corresponding to the reception level of the light input signal. This electric signal is amplified to a desired level by the variable gain amplifier circuit 72 and output as a received signal γ. At this time, the in-station device 85 can recognize the transmission distance of each user premises device 90 from the measurement of the transmission delay amount, and can predict the reception level of the optical input signal in advance using the transmission distance detection signal ε. The gain control circuit 73 sets the optimum gain by giving the gain control signal δ to the variable gain amplifier circuit 72 in consideration of the reception level of the optical input signal based on the transmission distance detection signal ε. By the above operation,
A relatively simple optical receiving circuit that does not give complicated feedback control to the variable gain amplifier circuit can be realized.

[0035]

As described above, according to the present invention, the transmission timing of the uplink burst data can be easily notified to each user's premises equipment. Therefore, the premises equipment side bit transmission system requires a memory and its attached parts. Good point-to-multipoint transmission can be provided. Also, since the transmission distance is recognized based on the measurement result of the transmission delay amount between the communication devices, the communication device on the signal transmission side can set and output the signal output level variably in anticipation of the attenuation of the signal level due to the transmission distance. This has the effect of reducing power consumption and not requiring a large dynamic range in the receiving circuit. Also provided is a gain control that can similarly recognize the transmission distance corresponding to the transmission delay amount measurement result and control the gain of the variable gain amplifier circuit of the receiving-side receiving circuit in anticipation of signal level attenuation due to the transmission distance. However, there is an effect that the response time can be shortened and complicated control is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a bit transmission system of a communication device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a frame configuration of a communication device according to an embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of an intra-office device side bit transmission system according to an embodiment of the present invention;

FIG. 4 is a block diagram illustrating a configuration of a home-apparatus-side bit transmission system according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a frame configuration in point-to-multipoint transmission of a communication device according to an embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of an optical output level control device according to one embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a gain control device according to one embodiment of the present invention.

FIG. 8 is a network configuration diagram for providing point-multipoint transmission.

FIG. 9 is a system configuration diagram for providing point / multipoint transmission.

FIG. 10 is a block diagram showing a conventional bit transmission system for point / multipoint transmission.

FIG. 11 is a diagram illustrating a frame configuration in conventional point-multipoint transmission.

[Explanation of symbols]

2 Frame generation circuit 3 Encoding circuit 4 CRV setting circuit 5 Transmission delay measuring circuit 6 Pulse detection circuit 7 Reception termination circuit 8 Decoding circuit 10 Decoding circuit 11 Reception termination circuit 12 CRV detection circuit 13 Basic frame setting circuit 14 Transmission timing detection Circuit 15 Pulse transmission circuit 16 Transmission timing setting circuit 17 Frame generation circuit 18 Maintenance / synchronization bit 19 Basic frame 20 CRV pulse 21 Transmission bit 22 Management bit 23 Auxiliary bit 24 Coding circuit 26 Local unit side bit transmission system 27 Home device Side bit transmission system 28 Intra-office device side bit transmission system 29 Home device side bit transmission system 34 Frame generation circuit 35 Encoding circuit 36 Transmission circuit 37 Reception circuit 38 Decoding circuit 39 Frame termination circuit 40 Pattern detection circuit 4 Judgment circuit 42 Receiving circuit 43 Decoding circuit 44 Frame termination circuit 45 Phase control circuit 46 Delay adjustment pattern sending circuit 47 Burst generation circuit 48 Encoding circuit 49 Transmission circuit 51 Downstream frame signal 52 Frame bit 53 Basic frame 54 Phase adjustment area 55 Phase Adjustment Pattern 56 Upward Burst Signal 57 Reception Judgment Phase 61 Light Emitting Element Drive Circuit 62 Light Emitting Element 63 Output Stabilization Circuit 64 Drive Current Control Circuit 71 Light Receiving Circuit 72 Variable Gain Amplifier Circuit 73 Gain Control Circuit 81 Telephone Station 84 User House 85 In-station equipment 87 In-station equipment bit transmission system 90 In-home equipment 92 In-home equipment bit transmission system

Claims (4)

(57) [Claims] 1. A point-side communication device and a multi-point side
Communication device, the point-side communication device and the
Data used for data communication between multipoint communication devices
In the data transmission system, the point-side communication device transmits a measurement signal used for measuring a transmission delay amount.
Sends a request signal to the multipoint side communication device.
Request signal transmitting means, and the measurement transmitted from the multipoint-side communication device.
Measuring means for receiving a signal for use and measuring a transmission delay amount, and a phase according to the transmission delay amount measured by the measuring means.
To the multipoint communication
Transmission delay transmitting means for transmitting to the device, the multi-point side communication device , according to the request signal transmitted from the request signal transmitting means
Measuring signal transmitting means for transmitting the measuring signal, and the code from the signal transmitted from the transmission delay transmitting means
Rule violation and sends it to the point-side communication device.
Timing setting means for setting the frame transmission timing
A data transmission system comprising: 2. Point-side communication device and multipoint
Side communication device.
Data communication is performed between the multipoint-side communication devices.
In the data transmission system, the point-side communication device transmits the measurement signal used for measuring the phase to the multi-point.
Request to send a request signal to the point-side communication device
Signal transmission means, and the measurement transmitted from the multipoint-side communication device.
Signal, and the phase of the measurement signal is
Detect which region of the divided phase adjustment region belongs
Phase region detecting means, and a phase indicating a region detected by the phase region detecting means.
A phase signal for transmitting a signal to the multipoint communication device.
And a No. transmitting unit, the multipoint communication system, depending on the request signal transmitted from the request signal transmitting unit
Measuring signal transmitting means for transmitting the measuring signal; and a measuring signal transmitting means for transmitting the measuring signal based on the phase signal transmitted from the phase signal transmitting means.
Transmission of a frame to be transmitted to the point side communication device
Timing setting means for setting timing.
Further, the point-side communication device may
Transmitting the request signal until the measured phase difference reaches an optimal value
Repeating the transmission of the request signal from the means.
Data transmission system. 3. A data signal is transmitted to a destination communication device.
Transmitting means for transmitting, and a transmission output level of the transmitting means.
Between the control means for controlling and the communication device of the transmission destination.
Detecting means for detecting an amount of transmission delay, wherein the control means
Is the transmission delay amount detected by the detection means.
A communication device that controls the transmission output level in response to the transmission output level . 4. A data signal is received from a transmission source communication device.
Receiving means for controlling the receiving level of the receiving means
Control means and a signal transmitted from the transmission source communication device
Detecting means for detecting the amount of transmission delay of the control means.
The stage is the transmission delay amount detected by the detection means.
A communication device that controls the reception level according to