JP2005341614A - Communications system, user equipment used in the communications system and center equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily realize exchange, addition or deletion of a communication service that a user uses. <P>SOLUTION: The center equipment 3 determines a downward time slot (TS) assigned to a destination terminal, inserts a downward packet (PKT) in the downward TS to generate a downward flame (FL), and transmits it to a communication line 2 within a downward FL period. The user equipment 1 determines downward TS, in which identification information of terminals connected to the equipment is added, manages its correspondence relation to an assigned terminal, determines the downward TS which is assigned to an output source terminal of a signal inserted in an upward PKT of upward TSs, inserts the upward PKT in the upward TS that is a pair of this to generate an upward FL, and transmits it to the communication line 2 within an upward FL period. The center equipment 3 determines that the output source terminal of the signal, inserted in the upward PKT of a signal that arrives through the communication line 2 during the FL period is a terminal, to which the downward TS that is a pair of the upward TS in which the upward PKT is inserted, is assigned. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a communication service for each of a plurality of types of terminals that are arbitrarily connected to a user apparatus, with the center apparatus and the user apparatus connected to each other via a communication line such as a star-shaped optical fiber network. The present invention relates to a communication system, and a center device and a user device used in the communication system.

  Conventionally, in communication systems that provide communication services, the communication service provider and each user are connected via separate communication lines, and the communication service of the contents individually contracted with each user is provided. Is provided to users.

  For this reason, in the conventional communication system, when the user adds a communication terminal different from the existing communication terminal and wants to receive communication service in parallel with the existing communication terminal, When removing an existing communication terminal, it is necessary to ask the communication service provider to perform expansion or removal of the communication line or work on the center unit, which greatly increases the cost, time and effort. It was.

  In addition, even when replacing an existing communication terminal with another type of communication terminal, it is necessary to ask the communication service provider to perform the construction of the center device, which is cost, time and labor. Was very big.

  As described above, in the conventional communication system, the communication line and the communication service are paired, and the type of the communication service provided for each communication line is also fixed. It was not possible to carry out only on the user side, and the construction by the communication service provider was required, so that there was a problem that the cost, time and labor for that were very large.

  The present invention has been made in consideration of such circumstances, and the object of the present invention is to provide a communication system that can easily exchange, add, and delete a communication service used by a user, and such a communication system. It is an object of the present invention to provide a center device and a user device that can realize the above.

In order to achieve the above object, the present invention configures a communication system by connecting a user apparatus to a center apparatus that provides a plurality of communication services via a communication line. The user apparatus includes a downlink frame period for transmitting a downlink signal from the center apparatus to the user apparatus, and an uplink signal from the user apparatus to the center apparatus as a transmission signal on the communication line. And a means for setting a plurality of downlink time slots and uplink time slots that are paired with each other in the downlink frame period and the uplink frame period; and The downlink time slot to which the identification information of the terminal connected to the own apparatus is added is determined from the downlink frame that arrives via the communication line, and the correspondence between the downlink time slot and the assigned terminal is managed. The downlink time slot management means that transmits the signal output from the terminal connected to the own device to a predetermined length A plurality of uplink packets each including a signal divided into a plurality of uplink time slots, and among the plurality of uplink time slots, a downlink time slot assigned with an output source terminal of the signal inserted in the uplink packet is defined as the downlink time slot An uplink frame generating means for determining an uplink frame by inserting the uplink packet into the uplink time slot that is paired with the corresponding downlink time slot and making a determination with reference to the management content of the slot management means; and And an uplink frame transmission means for transmitting to the communication line during the uplink frame period. Further, the center device includes a downlink frame period for transmitting a downlink signal from the center device to the user device, and an uplink from the user device to the center device as a transmission signal on the communication line. Each of which sets an uplink frame period for transmitting a signal, and sets a plurality of downlink time slots and uplink time slots that are paired with each other in the downlink frame period and the uplink frame period; and Time slot allocation storage means for storing the contents of downlink time slot allocation, and a signal to be transmitted to the terminal are divided into predetermined lengths, and at least identification information of the destination terminal is added to each of the divided signals. A plurality of downlink packets, and among the plurality of downlink time slots, A downlink frame that determines what is assigned to a terminal serving as a destination of the downlink packet with reference to the time slot allocation storage means, and generates the downlink frame by inserting the downlink packet into the corresponding downlink time slot Generating means, downlink frame sending means for sending the downlink frame to the communication line during the downlink frame period, and signals inserted in each of the uplink packets included in the signal arriving via the communication line Output source determination means for determining that the output source terminal is a terminal to which the downlink time slot paired with the uplink time slot into which the uplink packet is inserted is assigned.

  According to the present invention, exchange, addition, and deletion of a communication service used by a user can be easily realized.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an overall configuration of a communication system according to the present embodiment.

  In this communication system, a large number of user apparatuses 1 are connected to a center apparatus 3 via a plurality of optical fiber networks 2 (2-1 to 2-i), respectively, and each user apparatus 1 is connected to a telephone TEL and a personal computer PC. A communication terminal such as a private branch exchange PBX is arbitrarily connected. A monitoring control device 4 is connected to the center device 3. Further, the center apparatus 3 is arbitrarily connected to an existing communication network such as a public switched telephone network 5, a computer communication packet communication network 6, and a leased line network 7.

  The optical fiber network 2 forms a star shape with an optical fiber and an optical branching unit. A predetermined number (16 in this embodiment) of user devices 1 can be connected to one optical fiber network 2. Then, the access control is performed by the center apparatus 3 so that a plurality of user apparatuses 1 can share and use one optical fiber network 2.

  FIG. 2 is a functional block diagram showing a detailed configuration of the user device 1.

  As shown in this figure, the user apparatus 1 includes an optoelectric conversion unit 11, a TDMA processing unit 12, a service demultiplexing unit 13, four connectors 14 (14-1 to 14-4), a power supply unit 15, a battery 16, and a user. A device monitoring control unit 17 is included.

  The photoelectric conversion unit 11 further includes an optical branching coupler 11a, an optical receiving unit 11b, and an optical transmitting unit 11c.

  The optical splitter / coupler 11a provides the downstream optical signal that has arrived via the optical fiber network 2 to the optical receiver 11b and transmits the upstream optical signal output from the optical transmitter 11c to the optical fiber network 2.

  The optical receiver 11b converts the downstream optical signal supplied from the optical branching coupler 11a into an electrical signal (downstream electrical signal) and supplies the electrical signal to the TDMA processing unit 12.

  The optical transmission unit 11c converts the upstream electrical signal supplied from the TDMA processing unit 12 into an optical signal (upstream optical signal) and supplies the optical signal to the optical branching coupler 11a.

  The TDMA processing unit 12 further includes a frame synchronization unit 12a, a frame termination unit 12b, a time slot control unit 12c, a frame generation unit 12d, a delay control unit 12e, and a delay unit 12f.

  The downlink electrical signal given from the optical receiver 11b is input to the frame synchronizer 12a. Since this downstream electrical signal is framed in a format to be described later, the frame synchronization unit 12a performs frame synchronization of the downstream electrical signal and detects the frame head position and the like.

  The frame termination unit 12b is transmitted in the area other than the payload information (hereinafter referred to as overhead) transmitted from the downstream electrical signal in the area used for actual information transmission (hereinafter referred to as payload). The overhead information is separated, and the payload information is given to the service demultiplexing unit 13, and the overhead information is given to the time slot control unit 12c, the delay control unit 12e, the service demultiplexing unit 13, and the user device monitoring control unit 17, respectively. The frame termination unit 12b uses the payload information, the destination identifier (DST ID) used in transmission between the center device 3 and the user device 1, and each terminal interface (IF) card 8 (8-1 to 8-4). ) Is converted into a data format suitable for processing in each terminal interface card 8 according to the correspondence with the mounting position address of (), and is given to the service demultiplexer 13.

  The time slot control unit 12c controls the frame generation unit 12d to control the arrangement and timing of the time slot in the upstream electric signal based on the time slot arrangement in the downstream electric signal.

  The frame generation unit 12d receives the payload information given from the service demultiplexing unit 13, the overhead information given from the user equipment monitoring control unit 17 and the overhead information generated by itself under the control of the time slot control unit 12c. The upstream electrical signal is generated by framing the arrangement, and this upstream electrical signal is supplied to the delay unit 12f.

  The delay control unit 12e receives delay control information from the frame termination unit 12b in the overhead information included in the downlink electrical signal, and outputs the uplink electrical output from the frame generation unit 12d over the time indicated by the delay control information. The delay unit 12f is controlled so as to delay the signal.

  The delay unit 12f delays the uplink electrical signal given from the frame generation unit 12d under the control of the delay control unit 12e, and gives the delayed signal to the optical transmission unit 11c of the photoelectric conversion unit 11.

  The service demultiplexing unit 13 includes a downstream data bus 13a, an upstream data bus 13b, a downstream address bus 13c, an upstream address bus 13d, and an address processing unit 13e.

  The downstream data bus 13a has a 24-bit width, and the frame termination unit 12b of the TDMA processing unit 12 and the downstream data terminal of each connector 14 (terminal shown at the top in FIG. 2) are connected in common. Yes. The downlink data bus 13 a transmits the downlink payload information output from the frame termination unit 12 b to the terminal interface card 8 connected to each connector 14.

  The upstream data bus 13b has a 24-bit width, and the frame generator 12d of the TDMA processor 12 and the upstream data terminal of each connector 14 (the terminal shown second from the top in FIG. 2) are connected in common. Has been. The upstream data bus 13b transmits upstream payload information output from the terminal interface card 8 connected to each connector 14 to the frame generation unit 12d.

  On the down data bus 13a and the up data bus 13b, 8 time slots are set as 1 group, and 32 groups are accommodated during 1 msec to be 1 frame. Eventually, the bandwidth that can be used in one group is 24 × 8/1 msec = 192 kbit / s, which corresponds to three lines of B channel having a bandwidth of 64 kbit / s. Therefore, on the downlink data bus 13a and the uplink data bus 13b, as shown in FIG. 3, a group obtained by multiplexing the three B channels B1, B2, and B3 byte by byte is multiplexed into 32 groups in time division. It can be transmitted as data.

  That is, one user apparatus 1 can use a bandwidth of 3B × 32 = 96B = 6.3 Mbit / s as a whole.

  Thus, an N-ISDN terminal having two B channels and one D channel can be accommodated by assigning 1B to each of two B channels and one D channel using one group. In the case of a normal analog telephone terminal, 1B can be allocated to two analog telephone terminals using one group, and the remaining 1B can be accommodated by allocating as a common signal such as signaling. Similarly, a dedicated line service with a bandwidth of 3B or less can be accommodated by using one group as a 3B signal. For services that use a bandwidth larger than 3B (high-speed computer communication service or high-speed dedicated line service), all 32 groups can be accommodated by bundling multiple groups. Therefore, it becomes 96B (3B × 32 groups), and can accommodate a service with a maximum bandwidth of 6.3 Mbit / s.

  The downstream address bus 13c has a 24-bit width, and the address processing unit 13e and the downstream address terminal (the third terminal from the top in FIG. 2) of each connector 14 are connected in common. The downstream address bus 13 c transmits the downstream address information output from the address processing unit 13 e to the terminal interface card 8 connected to each connector 14.

  The upstream address bus 13d has a 24-bit width, and the address processing unit 13e and the upstream address terminals (terminals shown at the bottom in FIG. 2) of each connector 14 are connected in common. The upstream address bus 13d transmits upstream address information output from the terminal interface card 8 connected to each connector 14 to the address processing unit 13e.

  The address processing unit 13e determines the destination of the payload information from the header information given from the frame end unit 12b, creates downlink address information corresponding to the destination, and outputs it to the downlink address bus 13c. The address processing unit 13e receives the upstream address information that has arrived via the upstream address bus 13d, and is the same as the communication terminal specified by the downstream address information by the data transmission source indicated by the upstream address information, and When the information Null in the upstream address information is not “Null”, transmission permission is given to the frame generation unit 12d. Further, the address processing unit 13e notifies the user device monitoring control unit 17 of some information in the uplink address information.

  Each connector 14 is used to attach the terminal interface card 8 to the user apparatus 1 as necessary. When the terminal interface card 8 is attached, the connector 14 connects the internal circuit (described later) of the terminal interface card 8 to the downlink data bus 13a, the uplink data bus 13b, the downlink address bus 13c, and the uplink address bus 13d. Connecting.

  The power supply unit 15 receives power supply from a commercial power source or the battery 16, generates power for driving each unit, and supplies this to each unit.

  The user device monitoring control unit 17 realizes the operation as the user device 1 by comprehensively controlling each part of the user device 1. The user device monitoring control unit 17 also performs monitoring processing such as exchange of monitoring control information with the center device 3, failure management within the device, and control such as a loopback test.

  By the way, the user device monitoring control unit 17 has, for example, a microprocessor as a main control circuit, and in addition to the processing means for performing the control processing and monitoring processing as described above, the terminal interface detection means 17a, the terminal interface The recognition unit 17b, the configuration information transmission unit 17c, and the DST ID management unit 17d are realized by software processing.

  Among these, the terminal interface detection means 17a detects whether or not the terminal interface card 8 is attached to each connector 14. The terminal interface recognition unit 17b recognizes the attributes (manufacturer name, specification number, type of communication service that can be provided, etc.) and the mounting position address of the terminal interface card 8 that has been recognized by the terminal interface detection unit 17a. The configuration information transmitting unit 17c creates configuration information indicating the configuration of the user apparatus 1 based on the detection result of the terminal interface detection unit 17a and the recognition result of the terminal interface recognition unit 17b, and this is generated as a frame generation unit 12d. And transmitted to the center device 3. The DST ID management means 17d manages the correspondence between the destination identifier (DST ID) and the terminal interface card 8 set and notified by the center device 3 for each of the terminal interface cards 8 attached to the connector 14. Based on this, the address generation in the address processing unit 13e, that is, the demultiplexing operation is controlled.

  FIG. 4 is a functional block diagram showing a specific configuration example of the terminal interface card 8.

  As shown in this figure, the terminal interface card 8 has a connector 81, an address processing unit 82, a terminal interface (IF) unit 83, and a card information memory 84.

  The connector 81 is coupled to the connector 14 of the user device 1. The connector 81 has a downlink data terminal, an uplink data terminal, a downlink address terminal, and an uplink address terminal, respectively, like the connector 14, and these terminals are in electrical contact with each other when coupled to the connector 14. The downlink data terminal (terminal shown at the top in FIG. 4) and the uplink data terminal (terminal shown second from the top in FIG. 4) are connected to the address processing unit 82, respectively. Further, the downlink address terminal (terminal shown third from the top in FIG. 4) and the uplink address terminal (terminal shown fourth from the top in FIG. 4) are connected to the terminal interface unit 83.

  The address processing unit 82 monitors downlink address information transmitted on the downlink address bus 13c of the user apparatus 1 via the connector 81, and sets a destination identifier (DST ID) associated with the terminal interface unit 83 in the own card. If detected, the terminal interface unit 83 is caused to input data from the downstream data bus 13a and output data to the upstream data bus 13b. Further, when the address processing unit 82 detects a destination identifier (DST ID) associated with the terminal interface unit 83 in its own card, the address processing unit 82 stores the destination identifier (DST ID) in the card information memory 84. Upstream address information, which will be described later, is added to the upstream address terminal of the connector 81.

  The terminal interface unit 83 has one or a plurality of terminal connection ports, and converts the data output from the communication terminal connected to the terminal connection port into data in a form suitable for transmission via the upstream address bus 13b. Interface processing such as conversion or conversion of data input from the downlink data bus 13a into a signal in a form suitable for the communication terminal connected to the terminal connection port is performed.

  As the terminal interface card 8, cards corresponding to various services such as an analog telephone service, an N-ISDN service, and a data communication service are prepared. However, the terminal interface unit 83 is provided in accordance with the corresponding service. Something that performs different processing is provided.

  In the card information memory 84, attribute information such as a manufacturer name, a specification number, and a communication service type that can be provided is written in advance (for example, at the time of manufacture) and held.

  FIG. 5 is a functional block diagram showing a detailed configuration of the center apparatus.

  As shown in this figure, the center apparatus 3 includes a plurality (j) of optical user line termination units 31 (31-1 to 31-j) and a plurality (k) of network interface (IF) units 32 (32-1). 32 -k), a cross-connect unit 33, a power supply unit 34, and a center device monitoring control unit 35.

  Each of the optical user line termination units 31 is connected to the optical fiber network 2 as necessary.

  The optical user line termination unit 31 includes an opto-electric conversion unit 311 and a TDMA processing unit 312.

  The photoelectric conversion unit 311 further includes an optical branching coupler 311a, an optical reception unit 311b, and an optical transmission unit 311c.

  The optical splitter / coupler 311a gives the upstream optical signal that has arrived via the optical fiber network 2 to the optical receiver 311b, and transmits the downstream optical signal output from the optical transmitter 311c to the optical fiber network 2.

  The optical receiver 311b converts the upstream optical signal supplied from the optical branching coupler 311a into an electrical signal (upstream electrical signal) and supplies the electrical signal to the TDMA processing unit 312.

  The optical transmission unit 311c converts the downstream electrical signal supplied from the TDMA processing unit 12 into an optical signal (downstream optical signal) and supplies the optical signal to the optical branching coupler 311a.

  The TDMA processing unit 312 further includes a frame synchronization unit 312a, a frame termination unit 312b, a time slot control unit 312c, a memory unit 312d, a delay control unit 312e, and a frame generation unit 312f.

  The uplink electrical signal given from the optical receiver 311b is input to the frame synchronizer 312a. Since this upstream electrical signal is framed in a format to be described later, the frame synchronization unit 312a performs frame synchronization of the upstream electrical signal and detects the frame head position and the like.

  The frame termination unit 312b separates the payload information and overhead information from the upstream electrical signal, and transmits the payload information to the cross-connect unit 33, and the overhead information to the time slot control unit 312c, delay control unit 312e, and center device monitoring control unit 35. And give each. The frame termination unit 312b converts the payload information into a data format suitable for processing in the cross-connect unit 33, and gives the data to the cross-connect unit 33.

  The time slot control unit 312c controls the timing of information separation at the frame end unit 312b and the frame generation at the frame generation unit 312f according to the frame format indicated by information in various tables described later stored in the memory unit 312d. The timing control is performed.

  The delay control unit 312e measures the signal propagation delay time for each user device 1, and based on this, the upstream optical signal transmitted from the user device 1 installed at a different distance from the center device 3 is transmitted to the optical fiber network. 2, the transmission timing of each user apparatus 1 is determined so as to generate delay control information for instructing each user apparatus 1 to transmit the transmission timing, and this is given to the frame generation unit 312 f.

  The frame generation unit 312f receives the payload information given from the cross-connect unit 33, the overhead information given from the center device monitoring control unit 35, the overhead information (delay control information) given from the delay control unit 312e, and the overhead information generated by itself. Under the control of the time slot control unit 312c, a downlink electrical signal is generated by framing with a predetermined time slot arrangement, and this downlink electrical signal is provided to the optical transmission unit 311c of the photoelectric conversion unit 311.

  The network interface unit 32 is connected to an existing communication network such as the public switched telephone network 5, the computer communication packet communication network 6, and the leased line network 7 as necessary. The network interface unit 32 converts the data provided from the cross-connect unit 33 into a data format or a signal format corresponding to the connected network, sends the data to each network, and sends data received via each network. And the signal are converted into a data format suitable for processing by the cross-connect unit 33 and given to the cross-connect unit 33. As a communication method between the network interface unit 32 and each network, an SDH (Synchronous Digital Hierarchy) method can also be used.

  The cross-connect unit 33 separates uplink data from a plurality of communication terminals given in a time division manner from the optical user line termination unit 31, and is connected to a network that accommodates each uplink data for its destination communication terminal. To the optical user line termination unit 31 or the network interface unit 32. Further, the data provided from the network interface unit 32 is output to the optical user line termination unit 31 to which the optical fiber network 2 that accommodates the destination communication terminal is connected. The cross-connect unit 33 collects a plurality of data to be output to the same optical user line termination unit 31 and outputs the data in a time-sharing manner in a predetermined order.

  The power supply unit 34 receives power supply from, for example, a commercial power supply, generates power for driving each unit, and supplies this to each unit.

  The center device monitoring control unit 35 realizes the operation as the center device 3 by comprehensively controlling each part of the center device 3. The center device monitoring control unit 35 also performs monitoring processing such as exchange of monitoring control information with each user device 1, failure management within the device, and control such as a loopback test.

  By the way, the center device monitoring control unit 35 has, for example, a microprocessor as a main control circuit. In addition to the processing means for performing the control processing and monitoring processing as described above, the user configuration management means 35a, DST ID The setting means 35b, the DST ID notification means 35c, and the transmission band allocation means 35d are realized by software processing.

  Among these, the user configuration management unit 35a determines the configuration of each user device 1 (attributes and mounting positions of the terminal interface card 8 mounted on the user device 1) based on the configuration information transmitted from each user device 1. Keep it in control. The DST ID setting unit 35b performs new setting, change setting, or invalidation of the destination identifier (DST ID) in response to detection of a change in the configuration of the user device 1 by the user configuration management unit 35a. . The DST ID notifying unit 35c sends the destination identifier (DST ID) newly set, changed or invalidated by the DST ID setting unit 35b to the user apparatus 1 having the destination identifier (DST ID) setting target. To notify. Then, the transmission band allocating unit 35d performs new allocation or change allocation of the transmission band for each terminal interface card 8 in response to the user configuration managing unit 35a detecting that the configuration of the user device 1 has changed. Disable it.

The monitoring control device 4 is formed using, for example, a workstation, and performs monitoring control of the entire communication system. As an example, the monitoring control device 4
(1) Setting / release processing such as adding / removing the transmission bandwidth of the user device 1 in units of 3B (1B is a transmission bandwidth of 64 kb / s).

    (2) Monitoring process for line disconnection, errors, etc.

    (3) Loopback processing for each user device 1.

    (4) Management processing of subscriber information (subscriber name, service item, line capacity, etc.).

    (5) Billing process.

And so on.

  Next, the operation of the communication system configured as described above will be described.

  First, in the optical fiber network 2, in order to enable two-way transmission with the same optical wavelength using a single optical fiber cable, the TDM (Time Division Multiplexing) method is used in the downlink direction and the TDMA (Time Division Multiple Access) method is used in the uplink direction. The method is adopted.

  FIG. 6 is a diagram showing a configuration of a transmission frame on the optical fiber network 2.

  A transmission frame on the optical fiber network 2 is formed by repetition of a main frame formed by connecting the same number (16 in this case) of subframes as the maximum number of user apparatuses 1 accommodated in one optical fiber network 2.

  The subframe includes a downlink frame for transmitting information from the center apparatus 3 to each user apparatus 1 and a delay time measurement frame (DM) for measuring a transmission delay time between the center apparatus 3 and the user apparatus 1. And an upstream frame for transmitting information from each user apparatus 1 to the center apparatus 3. The delay time measurement frame (DM) is set between the downlink frame and the uplink frame, and the time required for the optical signal to reciprocate the allowable maximum distance between the center apparatus 3 and the user apparatus 1 is obtained. At least secured.

  Note that the same number of subframes as the maximum number of user apparatuses 1 is set, but each subframe is not associated with each of the user apparatuses 1 on a one-to-one basis. Is transmitted using. That is, the transmission cycle of user information is defined as a subframe cycle. Only one delay time measurement frame (DM) is secured in one subframe, and the transmission delay time between the center apparatus 3 and the user apparatus 1 is measured for one subframe. Since it can be performed only for the user apparatus 1, the main frame is set as a cycle for measuring transmission delay times for all user apparatuses 1 connected to one optical fiber network 2.

  Further, the downstream frame and the upstream frame are divided into several time slots, and each time slot is used for transmission of data information, information for monitoring control, and the like.

  During downlink frames, individual downlink monitoring for guard time (GT), preamble (PA), framing word (FW), common downlink monitoring control signal (OAM COM), and specific user equipment 1 (identification number is n) A control signal (OAMDn), a plurality (x) of downlink packet time slots (TSD01 to TSDx), and timing management (TMn) for a specific user apparatus 1 are set. Further, during an uplink frame, a timing response (TRn) relating to a specific user apparatus 1, an uplink monitoring control signal (OAMUn) relating to the specific user apparatus 1, and a plurality (x) uplink packet time slots (TSU01 to TSUx). Each is set.

  The guard time (GT) is a free time slot used to separate the downstream frame from the upstream frame in the previous subframe.

  The preamble (PA) is used for setting the phase synchronization and the identification level for the downstream frame that arrives in a burst form in the user apparatus 1, and “1” and “0” alternating signals are used.

  The framing word (FW) is a fixed bit pattern that is used for frame synchronization. The framing word (FW) and the preamble (PA) function as overhead in the downstream frame.

  The common downlink monitoring control signal (OAM COM) is used to broadcast alarm information, monitoring information, and control information to all user devices 1 connected to one optical fiber network 2, The detailed configuration is shown in FIG. As shown in FIG. 7, the common downlink monitoring control signal (OAM COM) indicates a subframe number (1 to 16), and subframe number information (SFN) for notifying the user apparatus 1 of the subframe number. This is used for actual monitoring control information (OAMC) for monitoring / control and error rate monitoring of the downlink transmission path, and consists of the BIP8 value (BIP8) in the previous downlink subframe. Note that the monitoring control information (OAMC) is for setting, for example, stopping or starting all the user devices 1.

  The individual downlink monitoring control signal (OAMDn) is used for individually monitoring and controlling a specific user apparatus 1, and its detailed configuration is shown in FIG. As shown in FIG. 8, the individual downlink monitoring control signal (OAMDn) is composed of the identifier (UIDt) of the user device 1 to be monitored and controlled and the actual monitoring control information (OAMO). The monitoring control information (OAMO) includes, for example, an instruction to read out the attribute of the user device 1, start / stop setting of the user device 1, setting / cancellation of the return test in the user device 1, and each terminal interface unit implemented in the user device 1 Instructions for reading the attributes related to, or setting / canceling the loopback test. Further, since this individual downlink monitoring control signal (OAMDn) is transmitted to one user apparatus 1 in one subframe, it is transmitted to all user apparatuses 1 connected to one optical fiber network 2 in one main frame. The transmission to the terminal is completed.

  The downlink packet time slots (TSD01 to TSDx) are used to transmit downlink packets including downlink user information, and are transmitted using the downlink packet time slots (TSD01 to TSDx). FIG. 9 shows a detailed configuration of the downstream packet. As shown in FIG. 9, the downlink packet is a destination identifier (DST ID) that can specify the terminal connection port of the terminal interface card 8 attached to the user apparatus 1, and the length of the downlink packet is the length of the uplink packet. Stuff bytes (BUFF: all “0” s are inserted) for matching, monitoring control information (OAMB) used for monitoring control in B units, and type information (INFFLG) indicating the type of user information (INFO) immediately after And user information (INFO).

  Timing management (TMn) is used for notifying various information for delay control from the center apparatus 3 to the user apparatus 1, and its detailed configuration is shown in FIG. As shown in FIG. 10, the timing management (TMn) includes variable user identifiers (UIDt) that are variably assigned by the center apparatus 3 according to the configuration of the user apparatus 1, delay control status (during control / control end), Delay control information (TDMA CNT) indicating delay correction time or timing response (TRn) transmission timing, fixed user identifier (UIDp) fixedly assigned to the user apparatus 1, and error correction for error detection It consists of a code (CRC).

  By the way, the phase of a signal arriving at the center device 3 from each user device 1 differs depending on the user device 1 due to delay control adjustment delay and fluctuations in delay time due to external factors. In addition, the amplitude of the signal arriving at the center device 3 varies depending on the user device 1 due to transmission path loss variation, component variation, and the like. Therefore, as shown in FIGS. 11 to 13, each upstream time slot has a preamble (PA) for adjusting phase synchronization and an identification threshold, and a unique unique word (UW) for byte synchronization. Is set. In order to prevent collision between upstream signals, a guard time (GT) is set at the head of the time slot in the timing response (TRn) and the upstream packet time slot. However, if the delay control and the transmission level adjustment in the user apparatus 1 are performed with high accuracy, the preamble (PA) and the guard time (GT) can be omitted.

  The timing response (TRn) is used for notifying various information for delay control from the user apparatus 1 to the center apparatus 3, and its detailed configuration is shown in FIG. As shown in FIG. 11, in addition to the preamble (PA) and unique word (UW) described above, the timing response (TRn) includes a fixed user identifier (UIDp) assigned to the user apparatus 1 that is the transmission source, It consists of configuration information (ATTR) of the user device 1 and an error correction code (CRC) for error detection.

  The uplink monitoring control signal (OAMUn) is used for notifying the center device 3 of alarms and conditions such as user device failure and transmission path error rate, and its detailed configuration is shown in FIG. As shown in FIG. 12, in addition to the guard time (GT), preamble (PA) and unique word (UW) described above, the uplink supervisory control signal (OAMUn) includes a secret code (EC) and user equipment. Consists of monitoring control information (OAMO) that indicates alarms and status such as failure and transmission path error rate.

  Each uplink packet time slot (TSU01 to TSUx) is used to transmit an uplink packet including uplink user information, and is transmitted using this uplink packet time slot (TSU01 to TSUx). FIG. 13 shows a detailed configuration of the uplink packet. As shown in FIG. 13, in addition to the guard time (GT), preamble (PA) and unique word (UW) described above, the upstream packet is used for monitoring control in units of B (1B is a transmission band of 64 kb / s). Monitoring control information (OAMB) to be performed, type information (INFFLG) indicating the type of user information (INFO) immediately after, and user information (INFO). The type information (INFFLG) can be omitted.

  Each of the downlink packet time slots (TSD01 to TSDx) and the uplink packet time slots (TSU01 to TSUx) in one subframe is 3B (64 kbit / s) using one packet time slot. User information can be transmitted. In other words, if the subframe period is 1 msec, 192 bits (24 bytes) of user information can be placed in one packet time slot. Thereby, one group of user information on the downlink data bus 13a and the uplink data bus 13b of the user apparatus 1 is converted into one of the downlink packet time slots (TSD01 to TSDx) and the uplink packet time slots (TSU01 to TSUx). Can be transmitted.

  Now, a user who newly joins this communication system, for example, asks a service provider to install an optical fiber from an optical branching unit in one of the optical fiber networks 2 to the installation position of the user device 1, The user apparatus 1 is connected to the fiber.

  On the other hand, when such a new subscription is applied, the service provider assigns fixed user identification information (UIDp) to the newly installed user device 1 and registers it in the center device 3 and the monitoring control device 4. And notify the user. When the user receives the notification of the fixed user identification information (UIDp) in this way, the user registers it in the user device 1. Alternatively, the service provider assigns UIDp to the user device in advance, and the manufacturer or the like registers it in the user device 1. Prior to starting the service, the user notifies the service provider of the UIDp of the user device to be used. The service provider registers the notified UIDp in the center device or the monitoring control device.

  In this way, the user device 1 is accommodated in the communication system.

  The accommodated user apparatus 1 transmits / receives necessary information to / from the center apparatus 3 using the assigned subframe.

(Delay control)
By the way, the distance from each user apparatus 1 connected to one optical fiber network 2 to the optical branching unit is indefinite and is different. For this reason, the time required for the upstream optical signal transmitted from each user apparatus 1 to reach the optical splitter is different for each user apparatus 1, and each user apparatus 1 transmits the upstream optical signal at the timing shown in FIG. Doing so may cause a collision in the optical splitter.

  Therefore, the following delay control is performed so that the timing of each optical signal becomes the timing shown in FIG.

  That is, first, in the center device 3, the center device monitoring control unit 35 inserts into the timing management (TMn) information indicating that the state of the delay control is being controlled in the delay control information (TDMA CNT) and completes the delay control. A fixed user identifier (UIDp) assigned to the user apparatus 1 that has not been inserted is inserted and transmitted to the optical fiber network 2.

  In the user apparatus 1, the user apparatus monitoring control unit 17 monitors the downstream frame of each subframe, and the delay control information (TDMA CNT) in the delay control information (TDMA CNT) as described above in the timing management (TMn). If it is detected that the information indicating that is being controlled is inserted and the fixed user identifier (UIDp) assigned to the own station is inserted, the frame generator 12d is caused to generate a timing response (TRn). . This timing response (TRn) is output from the frame generator 12d at the same time as the timing management (TMn) is completed under the control of the time slot controller 12c. If the delay control information (TDMA CNT) of the timing management (TMn) indicates that the delay control state is being controlled, the delay control unit 12e sets the delay amount of the delay unit 12f to “0”. Set to. Accordingly, the timing response (TRn) is transmitted to the optical fiber network 2 as an upstream optical signal at the same time as the timing management (TMn) is completed.

  When the center device 3 receives the timing response (TRn) transmitted from the user device 1 under delay control, the delay control unit 312e performs the above timing from the time when transmission of timing management (TMn) is completed in the same subframe. The time until the response (TRn) is received is measured, and the delay time for designating the transmission timing in the user apparatus 1 is calculated based on the measured time.

  That is, as shown in FIG. 14, the timing management (TMn) arrives at the user apparatus 1 after receiving the delay DA. The timing response (TRn) is transmitted from the user device 1 when the timing management (TMn) cannot be received by the user device 1. This timing response (TRn) reaches the center device 3 in response to the delay DB. . As a result, the time from when the transmission of timing management (TMn) is completed until the timing response (TRn) is received is TA, which is measured by the delay control unit 312e of the center apparatus 3.

  Now, in the normal state where user information is actually transmitted, the timing response (TRn) is received at the center device 3 at the end of the delay time measurement frame (DM) (the timing indicated by the broken line in the figure). ) Is the regular timing. That is, the reception timing of the timing response (TRn) in the center device 3 during the delay control is advanced over the time TB.

  Therefore, in a normal time, if the timing response (TRn) is transmitted as an upstream optical signal from the user apparatus 1 when the time TB elapses after the reception of the timing management (TMn) is completed, it receives the delay DB. Thus, the reception timing at the center device 3 coincides with the end point of the delay time measurement frame (DM).

  That is, in the delay unit 12f of the user device 3, the delay over the time TB is given to the uplink electrical signal given from the frame generation unit 12d, so that the reception timing of the uplink optical signal at the center device 3 is the timing shown in FIG. And avoid collisions.

  Here, the time TB corresponds to a time obtained by subtracting the time TA from the time assigned to the delay time measurement frame (DM). Accordingly, the delay control unit 312e of the center device 3 can obtain the time TB to be delayed by the user device 1 by subtracting the measured time TA from the time allocated to the delay time measurement frame (DM).

  Specifically, the time assigned to the delay time measurement frame (DM) is preset in the reception counter, and if this reception counter is down-counted until the timing response (TRn) arrives, this down-count value will be the time. TB.

  When the calculation of the time TB is completed, the delay control unit 312e of the center device 3 writes the time TB as a delay correction time in the timing management (TMn) after the next main frame, and notifies the user device 1 of the time TB. .

  In the corresponding user apparatus 1 that has received this, the delay control unit 12e recognizes the delay correction time TB written in the timing management (TMn), and thereafter the time TB is added to the upstream electrical signal given from the frame generation unit 12d. The delay unit 12f is controlled so as to give a delay over. In this state, the user apparatus 1 sends a timing response (TRn).

  Then, the center device 3 confirms that the arrival timing of the timing response (TRn) of the user device 1 has become a predetermined timing, and ends the delay control. When the delay control is terminated, in the center device 3, the delay control unit 312e indicates that the delay control state is the control termination by the delay control information (TDMA CNT) in the next mainframe.

  When the notification that the delay control is completed is received in this way, the user apparatus 1 transmits an uplink frame including an uplink packet time slot in addition to the timing response (TRn). Then, the center apparatus 3 confirms the uplink frame including the uplink packet time slot, confirms that synchronization between the user apparatus 1 and the center apparatus 3 is established, and notifies the user apparatus 1 of the synchronization. The service is started only after these confirmations are completed.

  By such delay control, the data transmitted from each user apparatus 1 can be normally received by the center apparatus 3 without colliding in the optical branching unit.

(Plug and Play)
By the way, a plurality of communication terminals can be connected to the user apparatus 1, and simultaneous communication by a plurality of communication terminals is possible within a range not exceeding the transmission bandwidth in one subframe. .

  The terminal interface card 8 for connecting the communication terminal is detachable from the user apparatus 1, and a plurality of types are prepared according to the type of the connected communication terminal. Therefore, the user obtains the terminal interface card 8 corresponding to the communication terminal to be connected and attaches it to the user device 1.

  In this communication system, the plug-and-play process for automatically recognizing the mounting state of the terminal interface card 8 in the user apparatus 1 by the center apparatus 3 and realizing communication via the terminal interface card 8 is as follows. To do.

  First, the user device 1 scans the terminal interface card 8 at a predetermined terminal interface scan timing (for example, every predetermined time after starting) and the quantity and attributes (manufacturer name) of the installed terminal interface card 8. , Specification number, service type that can be provided, etc.) and mounting location address.

  First, a physical address is set for each connector 14, and this physical address is notified to the terminal interface card 8 that is physically mounted by a pin voltage (not shown) or the like. When receiving the notification of the physical address of the connector 14 to which the terminal interface card 8 is attached, the terminal interface card 8 sets this to the card number as its own physical address. This card number is stored in the card information memory 84.

  Now, the address processing unit 13e of the service demultiplexing unit 13 sets the physical address of each connector 14 (card number of the terminal interface card 8 attached to the connector) for each group (at a predetermined terminal interface scan timing). Every 1132 msec), the data is output to the downstream address bus 13c.

  The address processing unit 82 of each terminal interface card 8 monitors the downstream address bus 13c, and when detecting its own physical address, the card number, the in-card channel number, the card ID-k, the service ID, the interface Uplink address information having a configuration as shown in FIG. 15 comprising control and information NULL display is output to the uplink address bus 13d. The downlink address information has the configuration shown in FIG.

  Here, when the terminal interface unit 83 has a plurality of terminal connection ports, the in-card channel number is used to identify each of them. The service ID is used to identify a service (for example, an analog telephone service, an N-ISDN service, etc.) corresponding to the terminal interface card 8. The card ID indicates the manufacturer name, the version number of the specification, and the like. This card ID is generally several bytes of information, and if it is flowed at once, the bus width is unnecessarily increased. Therefore, the start byte, sheet ID-k (k = 1, 2,... N) times, stop bytes It is possible to transfer the transfer divided into a total of about (n + 2) times. The interface control is used to transfer control information and alarm information related to the terminal interface card 8. The information NULL display is used to indicate that there is no information to be output from the terminal interface card 8 to the upstream data bus 13b or no information to be output from the downstream data bus 13a to the terminal interface card 8.

  Note that the upstream address information output from the address processing unit 82 of the terminal interface card 8 uses information NULL display to indicate that nothing is output in the data.

  Now, upon receiving the uplink address information as described above, the address processing unit 13e of the user device 1 gives necessary information of the information included in the uplink address information to the user device monitoring control unit 17.

  The user device monitoring control unit 17 manages the mounting status of the terminal interface card 8 to each connector 14 and the attributes of the mounted terminal interface card 8, and the like, based on information newly given from the address processing unit 13e. There is a newly installed terminal interface card 8, a removed terminal interface card 8, or a replaced terminal interface card 8 by determining a new installation status and comparing this with the already managed installation status. If so, it is detected (terminal interface detection means 17a). If new installation, removal, or replacement of the terminal interface card 8 is detected here, the attributes of the terminal interface card 8 related to them are recognized in detail (terminal interface recognition means 17b), and the management information Update.

((Plug and play process at the start of service))
Here, first, when there is a user device 1 (hereinafter referred to as 1-n) that is to start providing a new service, a plug and plugging performed on the terminal interface card 8 attached to the user device 1-n is performed. The procedure of the and play process will be described with reference to the sequence diagram shown in FIG.

  First, when there is a user device 1-n to start providing a new service, the center device monitoring control unit 35 in the center device 3 determines the fixed user identifier (UIDp) assigned to the user device 1-n. ) Is generated and transmitted to the frame generation unit 312f of the optical user line termination unit 31 corresponding to the optical fiber network 2 to which the user apparatus 1-n is connected (S1). Thereby, the delay control process described above is started.

  When the timing management (TMn) in which the user's fixed user identifier (UIDp) is written is given from the frame termination unit 12b, the user device monitoring control unit 17 in the user device 1-n gives the timing response (TRn) to the own station. Recognize that the request to send is given. Then, the user device monitoring control unit 17 inserts configuration information (ATTR) generated based on the fixed user identifier (UIDp) of the own station, management information related to the terminal interface card 8 and attribute information of the own device itself (ATTR) TRn) is generated by the frame generator 12d and output simultaneously with the end of the timing management (TMn). At this time, as described above, the delay amount of the delay unit 12f is set to “0”, and the timing response (TRn) is immediately transmitted to the optical fiber network 2 as an upstream optical signal after the completion of the timing management (TMn). It is transmitted (S2).

  When the center device 3 receives the timing response (TRn) transmitted from the user device 1-n as described above, the center device monitoring control unit 35 indicates the fixed user identifier indicated in the timing management (TMn) transmitted in S1. (UIDp) and the user are authenticated by collating with the fixed user identifier (UIDp) indicated in the timing response (TRn). In addition, it recognizes what kind of terminal interface card 8 is attached to the corresponding user device 1-n from the contents of the configuration information (ATTR), and relates this to the user device 1-n. Registered as management information (user configuration management means 35a).

  The center device monitoring control unit 35 determines a terminal connection port of each terminal interface card 8 attached to the user device 1-n based on the recognized information, and can identify each of the terminal identifiers (DST ID). (DST ID setting means 35b). Further, the center apparatus monitoring control unit 35 generates a variable user identifier (UIDt) for the user apparatus 1-n including all of the assigned destination identifiers (DST ID). Here, since the variable user identifier (UIDt) includes all of the destination identifiers (DST IDs) assigned to the terminal connection ports of each installed terminal interface card 8, This changes depending on the wearing situation, and is different from the fixed user identifier (UIDp) fixedly assigned to the user device 1 in this respect. Each destination identifier (DST ID) and variable user identifier (UIDt) assigned here are managed by including them in the management information related to the user device 1-n.

  Further, the center device monitoring control unit 35 assigns a transmission band to each terminal connection port of each terminal interface card 8 attached to the user device 1-n (transmission band assigning means 35d). This transmission band allocation processing is performed by using user information regarding communication terminals connected to each terminal connection port using downlink packet time slots (TSD01 to TSDx) and uplink packet time slots (TSU01 to TSUx) set in the subframe. This process is assigned for the transmission of the data, and details thereof will be described later.

  On the other hand, the delay control unit 312e of the center apparatus 3 calculates the delay correction time for the delay control described above.

  Then, in the next mainframe, the center device monitoring control unit 35 newly assigns a variable user identifier (UIDt) to the user device 1-n, delay control information (TDMA CNT) indicating the calculated delay correction time, user The timing management (TMn) in which each destination identifier (DST ID) assigned to the device 1-n is written is generated and transmitted by the frame generation unit 312f (S3: DST ID notification means 35c).

  When the timing management (TMn) transmitted from the center device 3 is received in this way, the user device monitoring control unit 17 in the user device 1-n assigns to each terminal connection port of each installed terminal interface card 8. The assigned destination identifier (DST ID) and the variable user identifier (UIDt) assigned to the own station are respectively recognized and stored. The destination identifier (DST ID) is stored in association with the terminal interface card 8 to which the destination is assigned.

  In the user apparatus 1-n, the delay amount in the delay unit 12f is set based on the delay correction time indicated in the delay control information (TDMA CNT) written in the timing management (TMn) by the delay control unit 12e. Control. Thereafter, as shown in S4 to S7, the timing response (TRn), the downlink frame, the uplink frame, and the downlink frame are sequentially exchanged between the user apparatus 1-n and the center apparatus 3, and “delay control” is performed. After the processing described above is performed, the user apparatus 1-n can receive a communication service.

((Plug and Play process when changing services))
Now, in the user apparatus 1, the provision of communication service is started by the initial plug-and-play process as described above, and the terminal interface card 8 is newly installed, removed, or replaced even in the operational state. This can be done arbitrarily by the user.

  Then, in order to cope with such new installation, removal, or replacement of the terminal interface card 8, plug-and-play processing is performed on the user device 1 in operation. The procedure of the plug and play process will be described with reference to the sequence diagram shown in FIG.

  First, the user device monitoring control unit 17 of the user device 1-n periodically checks the number, attribute, and mounting position address of the installed terminal interface card 8 and updates the management information according to the result of the check. Thus, when a new installation, removal, or replacement of the terminal interface card 8 is performed, the installation status of the terminal interface card 8 after the terminal interface card 8 is performed is managed (terminal). Interface detection means 17a and terminal interface recognition means 17b).

  Then, each time the user apparatus monitoring control unit 17 transmits the upstream frame (S12) after the downstream frame (S11) in each main frame, the user device monitoring control unit 17 updates the timing response (TRn) of the terminal interface card 8 in the upstream frame. The configuration information (ATTR) based on the mounting status of the user is inserted (configuration information transmission means 17c). Here, if there is a change in the mounting status of the terminal interface card 8, the configuration information (ATTR) is information for notifying the mounting status after the change, and the change content of the mounting status is automatically sent to the center device 3. Will be communicated.

On the other hand, when the center device 3 receives the timing response (TRn), the center device monitoring control unit 35 compares whether or not the content of the configuration information (ATTR) has changed with respect to the previously received content. When it is confirmed that there is a change, the center device monitoring control unit 35 updates the management information related to the user device 1-n (user configuration).
Management means 35a).

  Further, the center device monitoring control unit 35 determines each terminal connection port of each terminal interface card 8 attached to the user device 1-n based on the recognized information, and is assigned to the removed terminal interface card 8. Destination identifier (DST ID) and transmission band are released, and a destination identifier (DST ID) and transmission band are assigned to each terminal connection port of newly installed terminal interface card 8 (DST ID setting means 35b) And transmission band allocation means 35d). Further, the center device monitoring control unit 35 releases the above destination identifier (DST ID) and newly assigns a variable user identifier (DST ID) including all the destination identifiers (DST ID) assigned to the user devices 1-n. UIDt). Each destination identifier (DST ID) and variable user identifier (UIDt) assigned here are managed by including them in the management information related to the user device 1-n.

  Then, in the next mainframe, the center device monitoring control unit 35 writes the variable user identifier (UIDt) newly assigned to the user device 1-n and the destination identifier (DST ID) assigned to the user device 1-n, respectively. The timing management (TMn) is generated and transmitted by the frame generation unit 312f (S13: DST ID notification means 35c).

  When the timing management (TMn) transmitted from the center device 3 is received in this way, the user device monitoring control unit 17 in the user device 1-n assigns to each terminal connection port of each installed terminal interface card 8. The assigned destination identifier (DST ID) and the variable user identifier (UIDt) assigned to the own station are respectively recognized and stored.

  Subsequently, the user device monitoring control unit 17 of the user device 1-n generates, in the frame generation unit 12d, an uplink frame including an uplink packet time slot newly specified for the exchanged or added terminal interface card 8. And send it out (S14). Then, the center device monitoring control unit 35 of the center device 3 checks the upstream frame including the upstream packet time slot, and determines whether or not the packet time slot related to the changed terminal interface card 8 is used as specified. By confirming, the establishment of synchronization of the terminal interface card 8 that has changed is confirmed. If the synchronization is established, the center device monitoring control unit 35 notifies the user device 1-n that the synchronization has been established in the next main frame (S15).

  After this, it is possible to receive provision of communication services at the changed part of the user device 1-n.

((Plug and play processing at the start of service when billing is required))
Up to this point, the terminal interface card 8 installed in the user apparatus 1 is plug-and-operated so as to provide a service unconditionally as long as it does not exceed the transmission bandwidth allocated to the user apparatus 1.・ The play process is explained.

  However, in the case of this type of communication system, there is a case where a fee is charged for providing a communication service, and there is a case where a usable transmission bandwidth is limited depending on a contract with a user.

  Accordingly, FIG. 18 shows the procedure of the plug-and-play process performed for the terminal interface card 8 attached to the user apparatus 1-n when charging and limiting the transmission bandwidth used are as follows. This will be described with reference to a sequence diagram.

  In such a case, management of the contract contents for each user device 1 and billing processing are performed by the monitoring control device 4. Therefore, the monitoring control device 4 registers the fixed user identifier (UIDp) assigned to each user device 1 and the contract contents for each user device 1 in association with each other.

  When there is a user device 1-n to start providing a new service, the monitoring control device 4 uses the fixed user identifier (UIDp) assigned to the user device 1-n to the center device 3. Notification is made (S21).

  When the center device monitoring control unit 35 of the center device 3 receives the notification of the fixed user identifier (UIDp) from the monitoring control device 4, the center device monitoring control unit 35 performs the timing management (TMn) in which the fixed user identifier (UIDp) is written to the fixed user identifier. The frame generation unit 312f of the optical user line termination unit 31 corresponding to the optical fiber network 2 to which the user apparatus 1-n to which (UIDp) is assigned is connected is generated and transmitted (S22). Thereby, the delay control process described above is started.

  When the timing management (TMn) in which the user's fixed user identifier (UIDp) is written is given from the frame termination unit 12b, the user device monitoring control unit 17 in the user device 1-n gives the timing response (TRn) to the own station. Recognize that the request to send is given. Then, the user device monitoring control unit 17 inserts configuration information (ATTR) generated based on the fixed user identifier (UIDp) of the own station, management information related to the terminal interface card 8 and attribute information of the own device itself (ATTR) TRn) is generated by the frame generator 12d and output simultaneously with the end of the timing management (TMn). At this time, as described above, the delay amount of the delay unit 12f is set to “0”, and the timing response (TRn) is immediately transmitted to the optical fiber network 2 as an upstream optical signal after the completion of the timing management (TMn). It is transmitted (S23).

  When the center device 3 receives the timing response (TRn) transmitted from the user device 1-n as described above, the delay control unit 312e calculates the delay correction time for the delay control described above.

  On the other hand, the center device monitoring control unit 35 compares the fixed user identifier (UIDp) indicated in the timing management (TMn) transmitted in S22 with the fixed user identifier (UIDp) indicated in the timing response (TRn). Authenticate. Further, the center device monitoring control unit 35 recognizes what kind of terminal interface card 8 is mounted on the corresponding user device 1-n from the content of the configuration information (ATTR), and this quantity. Is registered as management information related to the user device 1-n (user configuration management means 35a).

  Then, the center device monitoring control unit 35 notifies the monitoring control device 4 of the completion of user authentication and the acquired configuration information (ATTR) (S24).

  Upon receiving the notification in S24, the monitoring control device 4 checks whether or not the configuration of the user device 1-n indicated by the configuration information (ATTR) matches the contracted service content, and then the corresponding user device 1 The amount of bandwidth to be allocated to each terminal interface card 8 attached to -n is determined according to the contract contents and notified to the center device 3 (S25).

  When the center device 3 receives the notification in S25, the center device monitoring control unit 35 assigns a transmission band to each terminal connection port of each terminal interface card 8 in accordance with the notified contents of the band setting. (Transmission band allocation means 35d). The center device monitoring control unit 35 assigns a destination identifier (DST ID) to each terminal connection port of each terminal interface card 8 attached to the user device 1-n (DST ID setting means 35b). Further, the center apparatus monitoring control unit 35 generates a variable user identifier (UIDt) for the user apparatus 1-n including all of the assigned destination identifiers (DST ID).

  Then, in the next mainframe, the center device monitoring control unit 35 newly assigns a variable user identifier (UIDt) to the user device 1-n, delay control information (TDMA CNT) indicating the calculated delay correction time, user The timing management (TMn) in which each destination identifier (DST ID) assigned to the device 1-n is written is generated and transmitted by the frame generation unit 312f (S26: DST ID notification means 35c).

  When the timing management (TMn) transmitted from the center device 3 is received in this way, the user device monitoring control unit 17 in the user device 1-n assigns to each terminal connection port of each installed terminal interface card 8. The assigned destination identifier (DST ID) and the variable user identifier (UIDt) assigned to the own station are respectively recognized and stored. The destination identifier (DST ID) is stored in association with the terminal interface card 8 to which the destination is assigned.

  In the user apparatus 1-n, the delay amount in the delay unit 12f is based on the delay correction time indicated by the delay control information (TDMA CNT) written in the timing management (TMn) by the delay control unit 12e. To control. In this state, the user apparatus 1 sends a timing response (TRn) (S27).

  Then, the center device monitoring control unit 35 of the center device 3 confirms that the arrival timing of the timing response (TRn) transmitted from the user device 1-n has reached a predetermined timing, and ends the delay control. When the delay control is finished, in the center device 3, the delay control unit 312e indicates that the delay control state is the control end in the delay control information (TDMA CNT) in the next mainframe (S28), The monitoring control device 4 is notified that the user registration has been completed (S29).

  If the notification indicating that the delay control has been completed is received, the user apparatus monitoring control unit 17 of the user apparatus 1-n generates an uplink frame including an uplink packet time slot in addition to the timing response (TRn) as the frame generation unit 12d. Generated and sent (S30). Then, the center apparatus monitoring control unit 35 of the center apparatus 3 confirms the uplink frame including the uplink packet time slot to confirm that the synchronization between the user apparatus 1-n and the center apparatus 3 has been established, This is notified to the user apparatus 1-n in the next main frame (S31), and the monitoring control apparatus 4 is notified that the synchronization establishment is completed (S32).

  Thereafter, the user apparatus 1-n can receive a communication service.

((Plug and play process when changing service when billing is required))
The provision of communication service is started by the initial plug-and-play process when charging is required as described above, and the new installation, removal, or replacement of the terminal interface card 8 in the user device 1-n in the operational state The procedure of the plug and play process for dealing with the above will be described with reference to the sequence diagram shown in FIG.

  First, the user device monitoring control unit 17 of the user device 1-n periodically checks the number, attribute, and mounting position address of the installed terminal interface card 8 and updates the management information according to the result of the check. Thus, when a new installation, removal, or replacement of the terminal interface card 8 is performed, the installation status of the terminal interface card 8 after the terminal interface card 8 is performed is managed (terminal). Interface detection means 17a and terminal interface recognition means 17b).

  Then, each time the user apparatus monitoring control unit 17 transmits the upstream frame (S42) after the downstream frame (S41) in each main frame, the user device monitoring control unit 17 updates the timing response (TRn) in the upstream frame to the latest of the terminal interface card 8. The configuration information (ATTR) based on the mounting status of the user is inserted (configuration information transmission means 17c). Here, if there is a change in the mounting status of the terminal interface card 8, the configuration information (ATTR) is information for notifying the mounting status after the change, and the change content of the mounting status is automatically sent to the center device 3. Will be communicated.

  On the other hand, when the center device 3 receives the timing response (TRn), the center device monitoring control unit 35 compares whether or not the content of the configuration information (ATTR) has changed with respect to the previously received content. When it is confirmed that there is a change, the center device monitoring control unit 35 updates the management information related to the user device 1-n (user configuration management means 35a).

  Further, the center device monitoring control unit 35 determines each terminal connection port of each terminal interface card 8 attached to the user device 1-n based on the recognized information, and is assigned to the removed terminal interface card 8. Release the destination identifier (DST ID) and transmission band.

  Thereafter, the center device monitoring control unit 35 notifies the monitoring control device 4 that the user device 1-n has a configuration change together with new configuration information (ATTR) (S43).

  Upon receipt of the notification in S43, the supervisory control device 4 checks whether or not the changed content is exchanged or added and there is a newly installed terminal interface card 8. If there is, the configuration information The amount of bandwidth allocated to the terminal interface card 8 newly installed in the user device 1-n after checking whether or not the configuration of the user device 1-n indicated by (ATTR) is compatible with the contracted service content Is determined in accordance with the contract contents and notified to the center apparatus 3 (S44).

  When the center device 3 receives the notification in S44, the center device monitoring control unit 35 assigns a transmission band to each of the terminal connection ports of the terminal interface card 8 in accordance with the notified contents of the band setting. (Transmission band allocation means 35d). The center device monitoring control unit 35 assigns a destination identifier (DST ID) to each terminal connection port of each terminal interface card 8 newly installed in the user device 1-n (DST ID setting means 35b). Further, the center device monitoring control unit 35 generates a variable user identifier (UIDt) for the user device 1-n including all of the destination identifiers (DST ID) assigned to the user device 1-n at this time. Each destination identifier (DST ID) and variable user identifier (UIDt) assigned here are managed by including them in the management information related to the user device 1-n.

  Then, in the next mainframe, the center device monitoring control unit 35 writes the variable user identifier (UIDt) newly assigned to the user device 1-n and the destination identifier (DST ID) assigned to the user device 1-n, respectively. The timing management (TMn) is generated and transmitted by the frame generation unit 312f (S45: DST ID notification means 35c). At this time, the center device monitoring control unit 35 notifies the monitoring control device 4 that the user registration has been completed (S46).

  Upon receiving the timing management (TMn) transmitted from the center device 3, the user device monitoring control unit 17 in the user device 1-n is assigned to each terminal connection port of each newly installed terminal interface card 8. A destination identifier (DST ID) and a variable user identifier (UIDt) assigned to the own station are recognized and stored.

  Subsequently, the user device monitoring control unit 17 of the user device 1-n generates, in the frame generation unit 12d, an uplink frame including an uplink packet time slot newly specified for the exchanged or added terminal interface card 8. And send it out (S47). Then, the center device monitoring control unit 35 of the center device 3 checks the upstream frame including the upstream packet time slot, and determines whether or not the packet time slot related to the changed terminal interface card 8 is used as specified. By confirming, the establishment of synchronization of the terminal interface card 8 that has changed is confirmed. If the synchronization is established, the center device monitoring control unit 35 notifies the user device 1-n that the synchronization is established in the next main frame (S48), and monitors and controls the completion of the synchronization establishment. The device 4 is notified (S49).

  After this, it is possible to receive provision of communication services at the changed part of the user device 1-n.

(Transmission bandwidth allocation processing and data transmission processing using the allocated transmission bandwidth)
First, in order to perform this processing, the memory unit 312d provided in the center apparatus 3 includes a service table (SVC TBL), a time slot number table (TSN TBL), and a TDMA status (TDMA STS) as shown in FIG. And a TDMA table (TDMA TBL) are set.

  The service table includes connectors 14 (here, a maximum of 4) that each of the 16 user apparatuses 1 that can be connected to the optical user line termination unit 31 provided with the memory unit 312d via the optical fiber network 2. The service type corresponding to the terminal interface card 8 attached to the connector 14 is registered in association with the service port number assigned to each of the above. FIG. 20 shows an example in which the terminal interface card 8 attached to the connector 14 having the service port number “S1” of the first user apparatus 1 corresponds to the telephone service (TEL).

  The time slot number table is associated with the service port number, and the numbers (& 1 to & x) of downlink packet time slots (TSD01 to TSDx) assigned to the terminal interface card 8 attached to the connector 14 having the service port number. ), And up to eight numbers can be registered in association with one service port number. In FIG. 20, an example in which downlink packet time slots having numbers “& 1” and “& 2” are allocated to the terminal interface card 8 attached to the connector 14 having the service port number “S1” of the first user apparatus 1. Is shown.

  The TDMA status is associated with the number (& 1 to & x) of the downlink packet time slots (TSD01 to TSDx) and registers whether or not the downlink packet time slot has been assigned to any of the terminal interface cards 8. It is something to keep. In FIG. 20, the downlink packet time slots with the numbers “& 1” and “& 2” are assigned to the terminal interface card 8 attached to the connector 14 with the service port number “S1” of the first user apparatus 1. In this example, “USE” indicating that the assignment has been made is shown.

  The TDMA table is associated with a number (& 1 to & x) of downlink packet time slots (TSD01 to TSDx), and a destination identifier (DST ID) serving as a destination of user information transmitted using the downlink packet time slots. The user information type information (INFFLG) is registered in association with each other. In FIG. 20, a downlink packet time slot with numbers “& 1” and “& 2” transmits information for a telephone (TEL) to a terminal having a destination identifier (DST ID) “# 1 S1”. The example which is used for is shown.

  Hereinafter, the ISDN primary is connected to the connector 14 having the service port number “S3” in one of the user devices 1 (first user device) connected to the optical user line terminating unit 31-1 via the optical fiber network 2. The transmission band allocation process will be described in detail by taking as an example a case where a terminal interface card 8 corresponding to the group service (PRI) is newly installed.

  When the center device monitoring control unit 35 recognizes this by the above-described plug and play process, first, as already shown in FIG. 20, the service port number “S3 of the first user device in the service table is firstly displayed. "Is registered to the ISDN primary group service (PRI) (ST1).

  Since the bandwidth required for the service, that is, the number of downlink packet time slots is determined from the service content, the center apparatus monitoring control unit 35 subsequently determines the number of downlink packet time slots required. Here, since it is an ISDN primary group service and its transmission rate is 23B + D, eight downlink packet time slots are required. Therefore, the center apparatus monitoring control unit 35 refers to the TDMA status and detects the necessary number (eight in this case) of downlink packet time slots that are unallocated ("UNUSE" in the TDMA status). If downlink packet time slots with numbers “& m” to “& (m + 7)” are detected, the contents of the TDMA status corresponding to these numbers are assigned from “UNUSE”. It is rewritten to “USE” shown (ST2).

  Next, the center apparatus monitoring control unit 35 copies the downlink packet time slot number assigned here to the time slot number table. That is, the numbers “& m” to “& (m + 7)” are entered in the area corresponding to the service port number “S3” of the first user device in the time slot number table (ST3).

  Finally, the destination identifier (DST ID) and type information (INFFLG) assigned to the areas corresponding to the numbers “& m” to “& (m + 7)” in the TDMA table by the plug and play process described above. "PRI" indicating ISDN primary group speed service is entered (ST4). Here, “# 1 S3” is assigned as the destination identifier (DST ID).

  On the other hand, when the registered terminal interface card 8 is removed, first, the number of the time slot for the downlink packet assigned to the service port number of the connector 14 to which the terminal interface card 8 is attached is set to the time slot. The determination is made with reference to the number table, the destination identifier (DST ID) and the type information (INFFLG) written in the TDMA table in association with the number are deleted, and the state of the TDMA status is rewritten to “UNUSE”. Finally, the information written in the service table and the time slot number table is deleted from the service port number of the connector 14 in which the removed terminal interface card 8 is mounted.

  Next, a procedure for actually generating a downlink frame according to each table in which various pieces of information are registered as described above will be described with reference to FIG.

  First, the time slot control unit 312c determines the service port number of the connector 14 to which the terminal interface card 8 to which the destination terminal of the data given from the cross connect unit 33 is connected is attached, and based on this, the time slot number By searching the table, the number of the time slot for the downlink packet to be used for transmitting the data is determined. That is, for the data destined for the communication terminal connected to the terminal interface card 8 attached to the connector 14 having the service port number “S3” in the first user device 1, the time slot number table is searched. Thus, the number of the downlink packet time slot to be used for transmitting the data is determined as “& m” to “& (m + 7)”.

  Incidentally, the frame generation unit 312f includes a cross-connect interface buffer (XCI BUF) that secures an area for storing user information (INFO) in association with each downlink packet time slot number, as shown in FIG. Have.

  Therefore, the time slot control unit 312c sets the service port number “S3” in the first user apparatus 1 in the area corresponding to the numbers “& m” to “& (m + 7)” determined in ST11 in the cross-connect interface buffer. The frame generation unit 312f is instructed to write data destined for the communication terminal connected to the terminal interface card 8 attached to the connector 14 having the connector 14 (ST12).

  In this way, one subframe of all data destined for the communication terminal connected to the user apparatus 1 connected via the optical fiber network to which the optical user line terminating unit 31-1 is connected is cross-connected. When the writing to the interface buffer is completed, the time slot control unit 312c reads the destination identifier (DST ID) and type information (INFFLG) written in association with the number “& 1” in the TDMA table, and the frame generation unit 312f. (ST13).

  Then, the frame generation unit 312f provides the destination identifier (DST ID) given from the time slot control unit 312c, the predetermined stuff byte, the monitoring control information (OAMB) given from the center device monitoring control unit 35, and the time slot control unit 312c. The type information (INFFLG) to be output is sequentially output, and the user information (INFO) written in association with the number “& 1” in the cross-connect interface buffer is read and output (ST14).

  Thus, the information string having the configuration as shown in FIG. 9 is output from the frame generation unit 312f.

  Then, by repeating this process while increasing the reading destination number in order, a downlink frame for one subframe is generated. However, guard time (GT), preamble (PA), framing word (FW), common downlink monitoring control signal (OAM COM), individual downlink monitoring control signal (OAMDn) and timing management (TMn) are added separately.

  Next, the operation of the user apparatus 1 when receiving a downstream optical signal including a downstream frame generated as described above will be described.

  When the downstream optical signal transmitted from the center apparatus 3 arrives via the optical fiber network 2, in the user apparatus 1, this downstream optical signal is given to the optical receiver 11b via the optical branching coupler 11a, and this optical reception It is converted into a downstream electric signal by the unit 11b.

  The downstream electrical signal is subjected to frame synchronization by the frame synchronization unit 12a and then decomposed by the frame termination unit 12b.

  In the frame termination unit 12b, for each downlink packet time slot (TSD01 to TSDx), the indicated destination identifier (DST ID) is assigned to the terminal connection port of the terminal interface card 8 installed in the local station. In this case, the destination identifier (DST ID) is given to the address processing unit 13e, and the user information (INFO), which is payload information, is transmitted to the downlink data bus. Is output to 13a. At this time, the address processing unit 13e generates a downlink address specifying the terminal interface card 8 and its terminal connection port corresponding to the destination identifier (DST ID) given from the frame termination unit 12b, and outputs it to the downlink address bus 13c. Is done.

  The terminal interface card 8 takes in data from the downlink data bus 13a only during the downlink frame period and when the terminal interface card 8 is designated by the downlink address. The data captured by the terminal interface card 8 is converted into a signal in a form suitable for the communication terminal and output to the communication terminal connected to the port corresponding to the destination identifier (DST ID).

  Thus, the user information (INFO) inserted in each downlink packet time slot (TSD01 to TSDx) is given to each destination communication terminal.

  By the way, at this time, in the time slot control unit 12c, the destination identifier (DST ID) and the type information (INFFLG) are fetched from the frame termination unit 12b and stored in the order of arrival. When the downlink frame period ends and the uplink frame period starts, the time slot control unit 12c stores the above-mentioned data in accordance with the timing of each uplink packet time slot (TSU01 to TSUx). The destination identifier (DST ID) and the type information (INFFLG) are sequentially given to the frame generation unit 12d in the order of acquisition. Therefore, the time slot control unit 12c can be configured by a simple circuit using a FIFO memory.

  In the frame generation unit 12d, when the destination identifier (DST ID) and the type information (INFFLG) are given from the time slot control unit 12c, the terminal interface card 8 attached to the own station has the destination identifier (DST ID). It is determined whether or not the terminal connection port is assigned, and only when this is the case, the destination identifier (DST ID) is given to the address processing unit 13e. At this time, the address processing unit 13e generates a downlink address designating the terminal interface card 8 and its terminal connection port corresponding to the destination identifier (DST ID) given from the frame generation unit 12d, and outputs it to the downlink address bus 13c. Is done.

  In the terminal interface card 8, the signal input from the terminal connection port specified by the upstream address is transmitted to the upstream data bus 13b only when it is specified by the upstream address during the upstream frame period. After being converted into data of the form, it is output to the upstream data bus 13b. At this time, the terminal interface card 8 outputs the upstream address information having the above-described configuration (shown in FIG. 15) to the upstream address bus 13d.

  In the address processing unit 13e, when the downstream address is output as described above during the upstream frame period, the upstream address information arriving via the upstream address bus 13d is monitored in parallel therewith. Only when the upstream address is that of the terminal connection port specified by the downstream address and the information Null in the upstream address information is not “Null”, the address processing unit 13e sends the frame to the frame generation unit 12d. Permission is granted.

  When this transmission permission is received, the frame generation unit 12d takes in data from the upstream data bus 13b and uses it as user information (INFO), and a predetermined header is added to this to generate an upstream packet.

  Then, the above operation is repeated to generate an upstream frame.

The upstream frame generated in this way is delayed by the delay unit 12f over the delay amount set by the delay control described above, and then transmitted by the optical transmission unit 11c.
Is transmitted to the optical fiber network 2 through the optical branching coupler 11a.

  When the upstream optical signal transmitted from the user apparatus 1 as described above arrives via the optical fiber network 2, the upstream optical signal is transmitted to the optical receiver 311b via the optical branching coupler 311a in the center apparatus 3. And is converted into an upstream electrical signal by the optical receiver 311b.

  The uplink electrical signal is subjected to frame synchronization by the frame synchronization unit 312a, and then once decomposed by the frame termination unit 312b to extract overhead information. Only the user information (INFO) is processed by the cross-connect unit 33. After being converted into a form suitable for the above, it is given to the cross-connect unit 33.

  In this way, the data provided to the cross-connect unit 33 is data output from a large number of communication terminals arranged in a time-sharing manner, the order of which is the time slot for each downlink packet (TSD01 to TSDx). This is the same as the order of assignment to the device, and is known by the center device 3. Therefore, each user information is distributed by the cross-connect unit 33 to a part corresponding to the link destination with the transmission source, and sent to the link destination.

  As described above, according to the present embodiment, the user apparatus 1 is connected to the center apparatus 3 via the optical fiber network 2 having a large transmission band, and the transmission band of the optical fiber network 2 is partially set to the user. By allocating to the device 1, the transmission band used in the center device 3 can be easily changed without performing physical work such as laying a line. Further, the user side has the feature that different types of communication services can be provided by one optical fiber transmission line, and the system can be realized at low cost by sharing the transmission equipment on the station side among a plurality of users. doing. Providing multiple services on a common network in this way makes network installation and management easier and reduces the cost of various communication services compared to using different networks for each service. Convenient to use.

  Further, since the user device 1 constantly monitors the mounting state of the terminal interface card 8 in the user device 1 and automatically notifies the center device 3 of this, the configuration of each user device 1 is configured in the center device 3. Can be managed.

  When the configuration of one of the user devices 1 is changed, the destination identifier (DST ID) and the bandwidth are released or the destination identifier (DST ID) and the new bandwidth are automatically assigned according to the change. Therefore, the result is set in each of the user device 1 and the center device 3, and thereafter, data transfer under the new setting is performed between the user device 1 and the center device 3. Therefore, it is possible to always provide a communication service corresponding to the configuration of each user apparatus 1.

  Therefore, if the user attaches / detaches or replaces the terminal interface card 8 to / from the user device 1, the contents of the communication service that can be provided by the user device 1 can be changed, and the user can change the communication service provider. There is no need to request or to perform construction work by a communication service provider.

  If the user attaches / detaches or replaces the terminal interface card 8 to / from the user device 1 by ending the plug-and-play process described in the above embodiment within a few seconds or less, the user after the configuration change is made. It is possible to receive a communication service corresponding to the device 1 almost instantaneously. Further, even if some of the terminal interface cards 8 are changed, the service can be continued without affecting other terminal interface cards 8.

  Further, according to the above embodiment, the configuration information (ATTR) indicating the mounting state of the terminal interface unit 8 in the user device 1 is transmitted in the timing response (TRn) set for delay control. The configuration information (ATTR) can be quickly notified to the center apparatus 3 without waiting for the delay control to be completed, and the waiting time until the communication service can be started can be shortened. it can.

  In the above embodiment, the communication service provider can manage in detail the contents of the communication service provided to each user device 1, so that user management such as billing is possible. It is also possible to limit the bandwidth allocated according to the contract contents.

  In the above embodiment, the user information (INFO) per downlink packet time slot (TSD01 to TSDx) and uplink packet time slot (TSU01 to TSUx) set in a transmission frame in the optical fiber network 2 is stored. Since the transmission band is set to 3B, it is possible to assign the transmission band to a single communication terminal in units of 3B. Therefore, there are various bandwidths such as analog telephone service, N-ISDN service, ISDN primary group service, etc. It is possible to respond flexibly to these services.

  Similarly, the downlink data bus 13a and the uplink data bus 13b of the user apparatus 1 are configured to transmit data in units of 3B, and have bandwidths such as analog telephone service, N-ISDN service, ISDN primary group service, and the like. It is possible to flexibly cope with the installation of the terminal interface card 8 corresponding to various different services.

  In the above embodiment, the terminal interface card 8 indicates the attributes (manufacturer name, specification number, type of communication service that can be provided, etc.) in the upstream address and notifies the user apparatus 1 side. Then, it is possible to check the attribute of the installed terminal interface card 8 without hindering the transmission of user information (INFO).

  Further, according to the above embodiment, the allocation state of each downlink packet time slot (TSD01 to TSDx) is managed by the four tables shown in FIG. 20, thereby assigning each downlink packet time slot (TSD01 to TSDx). That is, that is, bandwidth allocation can be changed easily and flexibly.

  Further, according to the above embodiment, the downlink packet time slots (TSD01 to TSDx) and the uplink packet time slots (TSU01 to TSUx) are associated with each other in a one-to-one correspondence. Each user information (INFO) is collected as an output source of user information (INFO) to be transmitted in the uplink packet time slot corresponding to the downlink packet time slot, and an uplink frame is generated. Therefore, it is not necessary for the user apparatus 1 to manage the allocation state of each uplink packet time slot (TSU01 to TSUx), the processing load on the user apparatus 1 is reduced, and the center apparatus 3 changes the allocation. This eliminates the need to notify the user device 1 of the contents each time. Furthermore, since the output source of the user information (INFO) inserted in the uplink packet time slots (TSU01 to TSUx) is known in the center apparatus 3, during the uplink packet time slots (TSU01 to TSUx), There is no need to insert identification information indicating the transmission source.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the configuration information (ATTR) is notified from the user apparatus 1 to the center apparatus 3 in the timing response (TRn). For example, in the uplink packet time slots (TSU01 to TSUx) As described above, it may be performed at other timing.

  In the above-described embodiment, the user device 1 has four connectors 14 and can be equipped with up to four terminal interface cards 8 at the same time. However, at least one connector 14 is sufficient, and the number thereof is arbitrary. Good.

  The configuration of the transmission frame and the configuration of each time slot are not limited to those described in the above embodiment, and can be changed as appropriate.

  Further, in the above embodiment, even when the monitoring and control device 4 determines the bandwidth allocation amount, the center device 3 performs the destination identifier (DST ID) and the bandwidth release based on the notification from the user device 1. However, the monitoring controller 4 determines the destination identifier (DST ID) and bandwidth to be released, and the center device 3 opens the destination identifier (DST ID) and bandwidth in accordance with an instruction from the monitoring controller 4. May be performed.

  In the above embodiment, the point-to-multi-point connection type star-shaped optical fiber network 2 is used as the network connecting the user apparatus 1 and the center apparatus 3, but the point-to-point connection type network is used. Alternatively, other types of networks such as a tree-shaped point-to-multi-point connection type network used in a CATV network may be used. Further, the present invention is not limited to an optical transmission network, and the present invention can be applied to the case where a coaxial cable, a wireless line, or the like is used as in the above embodiment.

  In the above embodiment, the downlink and the uplink are multiplexed by time division. However, it is also possible to multiplex by wavelength division using different wavelengths or transmission path division using different optical fibers. In this case, the upstream frame and the downstream frame are defined independently.

  In addition, although the form which only one specific user uses is also possible for one user apparatus 1, it can also be shared and used by several users.

  In addition, various modifications can be made without departing from the scope of the present invention.

1 is a diagram showing an overall configuration of a communication system according to an embodiment of the present invention. FIG. 3 is a functional block diagram showing a detailed configuration of the user device 1. The figure which shows the form of the data transmitted on the down data bus 13a and the up data bus 13b. 3 is a functional block diagram showing a specific configuration example of a terminal interface card 8. FIG. The functional block diagram which shows the detailed structure of a center apparatus. The figure which shows the structure of the transmission frame on the optical fiber network. The figure which shows the detailed structure of a common downlink monitoring control signal (OAM COM). The figure which shows the detailed structure of an individual downlink monitoring control signal (OAMDn). The figure which shows the detailed structure of the time slot (TSD01-TSDx) for downlink packets. The figure which shows the detailed structure of timing management (TMn). The figure which shows the detailed structure of a timing response (TRn). The figure which shows the detailed structure of an uplink monitoring control signal (OAMUn). The figure which shows the detailed structure of the time slot (TSU01-TSUx) for upstream packets. The figure explaining the process of delay control. The figure which shows the structure of upstream address information. The sequence diagram which shows the procedure of the plug and play process at the time of service start. The sequence diagram which shows the procedure of the plug and play process at the time of a service change. The sequence diagram which shows the procedure of the plug and play process at the time of the service start in case charging is required. The sequence diagram which shows the procedure of the plug and play process at the time of the service change when charging is required. The figure which shows typically the service table, time slot number table, TDMA status, and TDMA table which were set to the memory part 312d. The figure for demonstrating the production | generation procedure of a downstream frame.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... User apparatus, 11 ... Photoelectric conversion part, 11a ... Optical branching coupler, 11b ... Optical receiving part, 11c ... Optical transmission part, 12 ... TDMA processing part, 12a ... Frame synchronization part, 12b ... Frame termination part, 12c ... Time slot control unit, 12d ... Frame generation unit, 12e ... Delay control unit, 12f ... Delay unit, 13 ... Service demultiplexing unit, 13a ... Downlink data bus, 13b ... Uplink data bus, 13c ... Downlink address bus, 13d ... Upstream address bus, 13e ... Address processing unit, 14 (14-1 to 14-4) ... Connector, 15 ... Power supply unit, 16 ... Battery, 17 ... User device monitoring control unit, 17a ... Terminal interface detection means, 17b ... Terminal Interface recognition means, 17c... Configuration information transmission means, 17d... DST ID management means, 2 (2-1 to 2-i)... Optical fiber network, 3. 1 (31-1 to 31-j): optical user line termination unit, 311: photoelectric conversion unit, 311a: optical branching coupler, 311b: optical reception unit, 311c: optical transmission unit, 312: TDMA processing unit, 32 (32-1 to 32-k): Network interface (IF) unit, 33: Cross connect unit, 34: Power supply unit, 35: Center device monitoring control unit, 35a: User configuration management unit, 35b: DST ID setting unit, 35c ... DST ID notification means, 35d ... transmission band allocation means, 4 ... monitoring and control device, 5 ... public switched telephone network, 6 ... packet communication network for computer communication, 7 ... dedicated line network, 8 (8-1-8- 4) Terminal interface (IF) card, 81 Connector, 82 Address processing section, 83 Terminal interface (IF) section, 84 Card information memory.

Claims (4)

A center device that provides a plurality of communication services;
A user device connected to the center device via a communication line;
A downlink frame period for transmitting a downlink signal from the center apparatus to the user apparatus and an uplink signal for transmitting an uplink signal from the user apparatus to the center apparatus as transmission signals on the communication line A frame period, and a means for setting a plurality of downlink time slots and uplink time slots that are paired with each other in the downlink frame period and the uplink frame period;
A time slot allocation storage means provided in the center apparatus, storing the contents of the allocation of the downlink time slot to the terminal;
Provided in the center apparatus, a signal to be transmitted to the terminal is divided into predetermined lengths, and at least the identification information of the destination terminal is added to each of the divided signals to form a downlink packet, and the plural Of the downlink time slots assigned to the terminal that is the destination of the downlink packet with reference to the time slot allocation storage means, and inserting the downlink packet into the corresponding downlink time slot A downlink frame generating means for generating a downlink frame;
A downlink frame sending means provided in the center apparatus, for sending the downlink frame to the communication line during the downlink frame period;
A downlink time slot to which identification information of a terminal connected to the user apparatus is added is determined from the downlink frame that is provided in the user apparatus and arrives via the communication line, and is assigned to the downlink time slot. Downlink time slot management means for managing the correspondence with the terminal,
A plurality of uplink packets each including a signal obtained by dividing a signal output from a terminal connected to the user apparatus and connected to the user apparatus into predetermined lengths are formed, and the uplink packet is transmitted among the uplink time slots. The downlink time slot to which the output source terminal of the signal inserted in the packet is assigned is determined by referring to the management content of the downlink time slot management means, and the uplink time slot that forms a pair with the corresponding downlink time slot is An upstream frame generating means for generating an upstream frame by inserting an upstream packet;
An uplink frame transmission means provided in the user apparatus, for transmitting the uplink frame to the communication line during the uplink frame period;
An output source terminal of a signal inserted in each of the uplink packets included in the signal arriving via the communication line provided in the center device is paired with the uplink time slot in which each of the uplink packets is inserted. A communication system, comprising: an output source determination unit that determines that the terminal is assigned with the downlink time slot. The communication system according to claim 1, wherein a signal having a length such that a transmission band when using one time slot is 192 kbit / s is inserted into the downlink packet and the uplink packet. In a user device connected via a communication line to a center device that provides a plurality of communication services,
A downlink frame period for transmitting a downlink signal from the center apparatus to the user apparatus and an uplink signal for transmitting an uplink signal from the user apparatus to the center apparatus as transmission signals on the communication line A frame period, and a means for setting a plurality of downlink time slots and uplink time slots that are paired with each other in the downlink frame period and the uplink frame period;
From the downlink frame arriving via the communication line during the downlink frame period, a downlink time slot to which identification information of a terminal connected to the own apparatus is added is determined, and the downlink time slot and a terminal assigned thereto A downlink time slot management means for managing the correspondence between
A plurality of uplink packets each including a signal obtained by dividing a signal output from a terminal connected to the own device into predetermined lengths are formed, and signals inserted into the uplink packet among a plurality of uplink time slots Determining a downlink time slot to which an output source terminal has been assigned with reference to the management content of the downlink time slot management means, and inserting the uplink packet into the uplink time slot paired with the corresponding downlink time slot An uplink frame generating means for generating an uplink frame at
A user apparatus comprising: an uplink frame transmission means for transmitting the uplink frame to the communication line during the uplink frame period. In a center device that provides a plurality of communication services to a user device connected via a communication line,
A downlink frame period for transmitting a downlink signal from the center apparatus to the user apparatus and an uplink signal for transmitting an uplink signal from the user apparatus to the center apparatus as transmission signals on the communication line A frame period, and a means for setting a plurality of downlink time slots and uplink time slots that are paired with each other in the downlink frame period and the uplink frame period;
Time slot assignment storage means for storing the contents of the assignment of the downlink time slot to the terminal;
A signal to be transmitted to the terminal is divided into predetermined lengths, and at least the identification information of the destination terminal is added to each of the divided signals to form a plurality of downlink packets, and a plurality of downlink time slots Among them, the assignment to the terminal that is the destination of the downlink packet is determined with reference to the time slot allocation storage means, and the downlink packet is generated by inserting the downlink packet into the corresponding downlink time slot. Downlink frame generating means;
Downlink frame sending means for sending the downlink frame to the communication line during the downlink frame period;
The downstream time slot that is paired with the upstream time slot in which the upstream packet is inserted is assigned to the output source terminal of the signal inserted in each of the upstream packet included in the signal arriving via the communication line. A center apparatus comprising output source determination means for determining that the terminal is a terminal.

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