JP5109961B2 - Order wire control method and transmission apparatus - Google Patents

Description

  The present invention relates to an order wire control method and a transmission apparatus that provide a dedicated line for maintenance of the transmission apparatus.

  The present invention supports an order wire as a maintenance dedicated line in an ADM (Add Drop Multiplexer) transport system of a synchronous network such as SDH (Synchronous Digital Hierarchy) or SONET (Synchronous Optical Network).

  An order wire (OW) is an A / D conversion of a voice signal input from a telephone (transmitting station), is inserted into an overhead E1 # 1 byte or E2 # 1 byte, and is multiplexed and output. The transmission device (ADM device or relay device) that relays terminates the E1 # 1 byte or E2 # 1 byte, adds the voice signal of the local station, and then sends the audio to the E1 # 1 byte or E2 # 1 byte of the overhead again. Insert data and relay transfer.

  The receiving station performs D / A conversion on the E1 # 1 byte or E2 # 1 byte voice data and outputs a voice signal to the telephone, thereby enabling a call between the calling station and the receiving station. Further, two bytes of E1 byte and E2 byte are allocated as order wire bytes.

  FIG. 1 shows a configuration diagram of an example of a conventional order wire network having a linear configuration. FIG. 2 is a block diagram showing an example of an order wire circuit unit of a conventional transmission apparatus.

  In FIG. 1, the transmission devices of a station, b station, c station, and d station are connected in a linear configuration by lines (transmission paths). The transmission device of each station includes an adder 11 that adds audio signals, CODECs 12a and 12b that perform A / D conversion and D / A conversion, and an overhead byte multiplexing unit that multiplexes audio data into E1 and E2 bytes of SOH (Section OverHead) (OHB MUX) 13a, 13b and overhead byte demultiplexing units (OHB DMUX) 14a, 14b for demultiplexing audio data from E1, E2 bytes of SOH.

  Further, as shown in FIG. 2, the adding unit 11 is connected to the telephone 18 via an E1 / E2 switching unit 15, hook switches 16 a and 16 b, and a hybrid (HB) 17. A DTMF receiver 19 is connected to the hook switch 16a. The station number coincidence detecting unit 20 performs coincidence detection with the station number of the own station of the received DTMF signal. The call operation unit 21 performs a call operation with a buzzer, an LED, or the like according to the coincidence detection signal. The ringback tone generator (RBT) 22 generates a ringback tone based on the coincidence detection signal and supplies it to the adder 11 from the hook switch 16b.

  The operation of calling the maintenance person of the receiving station using the DTMF transmission function of the telephone connected to the transmitting station apparatus will be described.

  First, as settings for each transmission device, E1 / E2 selection of each line in the E1 / E2 switching unit 15, setting of a station number (device ID) used for a calling function in the station number coincidence detection unit 20, and a calling operation The call operation setting in the unit 21 is performed by the microcomputer (μ-COM) 24 in the transmission apparatus.

  The maintenance person of the transmitting station (station a) off-hooks the telephone 18 and dials the device ID “# 004” of the calling station (receiving station). The receiving station (d station) converts the analog signal sent by the DTMF code by the DTMF receiving unit 19 and detects the coincidence with the own station number. If the coincidence, the ring back tone transmission and calling operation (buzzer, LED etc.). When the maintenance person notices the calling operation and off-hooks the telephone 18, the calling operation is canceled and a call between the maintenance personnel becomes possible.

  In order to always detect the coincidence with the local station number even in a station other than the transmission or reception, each transmission device terminates the E1 # 1 byte or the E2 # 1 byte and D / A converts it to a voice signal. This audio signal passes through the adder 11 and is A / D converted, and then multiplexed again on the overhead E1 # 1 byte or E2 # 1 byte for relay transfer.

  Conventionally, there is an order wire network that supports two methods of station number calling (point-to-point calling) and group calling (multi-point calling). In this case, since the order wire circuit for group calling is also used for station number calling, the E1 # 1 byte or E2 # 1 byte is terminated at a station other than the outgoing / incoming call, and D / A conversion is performed to perform an analog addition unit. After the A / D conversion is performed on the adder output, data is inserted into the E1 # 1 byte or E2 # 1 byte of the overhead again so that a multipoint call can always be performed.

<Ring protection function, ring restoration function>
The ring protection function and the ring restoration function will be described with reference to FIG. The ring protection function sets the master station and slave station in the ring to prevent the howling phenomenon in the ring configuration, and disconnects (terminates) the order wire signal (OW signal) on the west side of the master station line. It is. In FIG. 3A, station a is set as a master station, and stations b, c, and d are set as slave stations. Then, the OW signal on the west side of station a is disconnected (indicated by two solid lines). The master station / slave station is set by the microcomputer of each transmission apparatus.

  The ring restore function normally cuts off the order wire signal (OW signal) on the west side of the master station line, but if a line failure occurs, a station that does not connect to the OW line can be created. By notifying the master station of line failure information using the F1 byte, D4 # 2 byte, E1 # 2 byte, and E2 # 2 byte, the OW signal disconnection at the west side of the master station is stopped in the event of a line failure. This is a function for relieving the OW line. In FIG. 3B, a line failure occurs between the stations c and d, and the station a notified of the line failure cuts off the OW signal on the west side as shown in FIG. To stop.

  By the way, in order to effectively use only one OW line in the order wire line of the transmission apparatus, a control signal is transmitted / received and set using surplus OHB, thereby enabling simultaneous communication in a plurality of sections of the line. Yes (see, for example, Patent Document 1).

In addition, there is a technique that avoids deterioration of voice characteristics by determining whether or not to terminate a signal by looking at an incoming state of the own apparatus in a multistage connected communication apparatus having an order wire line (for example, patents) Reference 2).
Special opening and closing 7-58718 JP 2003-244197 A

  The ring protection function and the ring restoration function in the dual ring configuration will be described with reference to FIG.

  As shown in FIG. 4 (A), howling prevention in the dual ring configuration is achieved by using the transmission device NE1 as a master station in the ring A composed of the transmission devices NE1, NE2, NE3, NE4, and the transmission devices NE5, NE6, NE7. , NE8, the transmission device NE6 is the master station, and the OW signal on the west side of each line is cut off.

  In the configuration of FIG. 4A, a loop is formed by NE2 and NE3 of ring A and NE5 and NE8 of ring B. For this reason, for example, the OW signal is disconnected (DISABLE: indicated by two solid lines) between NE3 and NE8 (or between NE2 and NE5), for example, by manual setting of the microcomputer.

  Here, as shown in FIG. 4B, when a line failure occurs between NE2 and NE5 that connect (ENABLE) the OW signal that connects between rings A and B, the automatic relief circuit does not work. The order wire line cannot be used between NE 2 of ring A and NE 5 of ring B.

  For this reason, when a new ring is added to the existing ring to create a complicated network structure, the conventional ring protection function and ring restoration function will not be able to automatically repair when a failure occurs. There was a problem.

  In addition, in the conventional order wire function, each transmission apparatus terminates the E1 # 1 byte or the E2 # 1 byte and performs D / A conversion in order to always detect the coincidence with the local station number even in a station other than the transmission or reception. To an audio signal. This audio signal passes through the adder 11, undergoes A / D conversion, and is multiplexed again to the overhead E1 # 1 byte or E2 # 1 byte for relay transfer. For this reason, the E1 # 1 byte or the E2 # 1 byte is always used, and there is a problem that a plurality of maintenance personnel calls (point-to-point) are impossible on the same line (same line).

  The disclosed order wire control method is intended to enable automatic remedy at the time of failure in a complicated network configuration.

An order wire control method according to an embodiment of the disclosure is an order wire control method for performing a call between transmission devices constituting a synchronous network.
The transmission device of the transmission station transmits the route search packet data in which the device information of the local station is set in the first byte of the overhead of the synchronous transfer signal,
The transmission device that has received the route search packet data adds the device information of the local station to the received route search packet data when there is a transmission destination, and transmits it to the received route search packet data when there is no transmission destination. Add device information and termination information of own station and send it back to the source station,
The transmitting station transmission device creates an order wire connection route table based on device information of a plurality of transmission devices set in route search packet data returned from the terminal transmission device,
The transmitting station transmission device transmits the station number calling packet data addressed to the receiving station transmission device based on the order wire connection route table in the second byte of the overhead of the synchronous transfer signal,
The transmission apparatus of the receiving station that has received the station number calling packet data cross-connects the third byte of the overhead of the synchronous transfer signal to the telephone, and returns the station number calling packet data to the originating station.
The transmission apparatus of the originating station that has received the returned station number call packet data cross-connects the third byte to the telephone,
The order wire line is connected between the transmitting station transmission apparatus and the receiving station transmission apparatus.

  According to the present embodiment, automatic remedy at the time of failure in a complicated network configuration is possible.

  Embodiments will be described below with reference to the drawings.

<First Embodiment>
FIG. 5 shows a block diagram of an embodiment of a linear configuration order wire network. FIG. 6 is a configuration diagram of an embodiment of the order wire circuit unit of the transmission apparatus.

  In FIG. 5, the transmission devices of stations a, b, c, and d are connected in a linear configuration by lines (transmission paths). The transmission apparatus of each station includes an OW connection route / call control unit 31 that performs OW connection route control or call control, an XC / adder unit 32 that performs cross connection or addition of station number call packet data voice data, A / D conversion, and D / CODEC 33 that performs A conversion, route search packet data, station number call packet data, and voice data are overhead byte multiplexing units (OHB MUX) 34a and 34b that multiplex F1, D4, E1, and E2 bytes of SOH, and F1, D4 of SOH , E1 and E2 bytes are provided with overhead byte demultiplexing units (OHB DMUX) 35a and 35b for demultiplexing route search packet data, station number calling packet data, and voice data.

  Further, as shown in FIG. 6, the XC / adder 32 is connected to the telephone 39 via a hybrid (HB) 38 for converting E1 / E2 switching unit 36, CODEC 33, 4W / 2W (4 wires / 2 wires). Has been. Further, the microcomputer (μ-COM) 40 creates and holds an OW connection route table, and performs setting and control of each part of the transmission apparatus such as setting selection of the E1 / E2 switching unit 36.

  A ring back tone generator (RBT) 42 generates a ring back tone according to the setting of the microcomputer 40, and a selector (SEL) 43 selects either the ring back tone or the CODEC 33 output and supplies it to the E1 / E2 switching unit 36. To do.

  The DTMF receiver 44 receives the DTMF signal generated by the telephone 39 and notifies the microcomputer 40 of it. A busy tone generator (BT) 45 generates a busy tone according to the setting of the microcomputer 40 and supplies it to the CODEC 33.

  The call operation unit 46 performs a call operation with a buzzer, an LED, or the like according to settings from the microcomputer 40. The power supply circuit 47 detects the off-hook of the telephone 39 and supplies power to the telephone 39, and notifies the microcomputer 40 of the detection of the off-hook and the on-hook.

  The OW connection route / call control unit 31 sends route search packet data and station number call packet data set in the F1 / D4 # 1-3_INS (insertion unit) 31a from the microcomputer 40, and F1 # 1-3 bytes of the SOH. Send to each transmission device in the network using D4 # 1-3 bytes. Further, the F1 / D4 # 1-3_FF (extraction unit) 31b notifies the microcomputer 40 of the F1 # 1-3 bytes and the D4 # 1-3 bytes extracted from the SOH received from another transmission apparatus.

  The XC / adder 32 includes an E1_XC card that performs an E1 byte cross-connect, an E2_XC card that performs an E2 byte cross-connect, a card that performs E1 byte digital audio addition (multi-point call), and an E2 byte digital audio. Four cards, which are cards to be added (multi-point call), are prepared, and one of these cards is selected by the E1 / E2 switching unit 36.

  In the present embodiment, the XC / adder 32 performs cross-connect control of the audio signal from any of the # 1 byte to the # 3 byte of the E1 / E2 byte according to the use status of the line. Here, for example, the E1 byte is assigned to the order wire between the relay devices or between the relay device and the ADM device, and the E2 byte is assigned to the order wire between the ADM devices. The E1_XC card and the E2_XC card are controlled by the microcomputer 40. Selects the unused byte from the # 1 to # 3 bytes of the E1 / E2 bytes and cross connects them.

  The microcomputer 40 always secures an OW line route based on information in the OW connection route table.

  FIG. 7 shows the frame format of the SONET synchronous transfer signal STS-3. In the figure, order wire voice data is allocated to E1 # 1-3 bytes and E2 # 1-3 bytes (third byte) in SOH, and route search is performed for F1 # 1-3 bytes (first byte). Allocating to packet data, D4 # 1-3 bytes (second byte) are allocated to station number calling packet data.

<Initial setting>
First, as a setting for each transmission device, E1 / E2 selection of each line is set from the microcomputer 40 to the OW connection route / call control unit 31 and E1 / E2 switching unit 36, and the station number setting used for the call function is set as a ring. The back tone generating unit 42 is set from the microcomputer 40, and the call operation setting is set to the call operation unit 46 from the microcomputer 40.

  For the line using the order wire, the E1 / E2 byte is set to enable, for the line not using the order wire, the E1 / E2 byte is set to disabled. ID) is individually set so as not to have the same number as other transmission apparatuses. A station that does not always have the telephone 39 sets the OW byte (E1 / E2 / F1 / D4) to the through setting.

  The XC / adder 32 can select a multipoint call and an E1 / E2 byte cross-connect. The following description will be made assuming that the X1 / E2 byte cross-connect is selected.

<Create connection route>
When a maintenance person of the transmission station (station a) off-hooks the telephone set 39, the transmission station becomes the master and starts creating an OW connection route table. First, the microcomputer 40 of the master station sets the station number (device ID) of the own station, the number of the interface to be transmitted (INF n), and the status (ACT) indicating the state of the interface to be transmitted in the route search packet data, and F1 / The data is sent to D4 # 1-3_INS 31a, and F1 # 1-3 bytes, which are route search packet data, are mapped (multiplexed) to the main signal by the overhead byte multiplexing unit 34a and transmitted to the opposite station (slave station).

  FIG. 8 shows the format of route search packet data. In the figure, following the synchronization bit, the station number, interface number, and status are stored as the device information of the master station, and the station number, interface number, and status are stored as the device information of the slave station in the order of the received transmission device. After this, an end flag (END) indicating the end of the route is stored, and finally an error detection FCS (Frame Check Sequence) is stored. The status ACT indicates an operation state, STBY indicates a stop state, and ALM indicates a failure occurrence state.

  The transmission devices (stations b and c) that have received the route search packet data extract F1 # 1-3 bytes by F1 / D4 # 1-3_FF 31b of the OW connection route / call control unit 31 and notify the microcomputer 40 To do. The microcomputer 40 adds its own device information (station number, interface number, status) to the F1 / D4 # 1-3_INS 31a after the master station of the route search packet data, and sends it to the F1 / D4 # 1_3_INS 31a. The F1 # 1-3 bytes as data are mapped (multiplexed) to the main signal and transmitted to the opposite station (slave station).

  Also, the terminal station (d station) adds its own device information (station number, interface number, status) to the c station device information, and adds an end flag (route termination) to add F1 / D4 # 1- 3_INS 31a, and the overhead byte multiplexing unit 34b maps (multiplexes) F1 # 1-3 bytes, which are route search packet data, to the main signal and returns them to the transmitting station.

  The source station (station a) creates an OW connection route table based on the device information of stations a, b, c, and d in the route search packet data returned from the terminal station (station d). The device information of stations a, b, c, and d in the route search packet data is a record for one entry in the OW connection route table. Note that the calling station (station a) informs the maintenance person that the OW connection route table is being created by an LED (for example, green light emission) of the calling operation unit 46.

<OW connection procedure>
The station number calling operation is started when the maintenance person of the transmitting station dials the device ID “# 004” of the calling station (receiving station, for example, station d) from the telephone 39 or an NMS (network management system) (not shown).

  The DTMF code sent from the telephone set 39 is received by the DTMF receiver 44 and notified to the microcomputer 40 or from the NMS to the microcomputer 40. As a result, the a station becomes the transmitting station and the station number calling operation is started. According to the setting of the microcomputer 40, the a station number and the d station number are set in the station number calling packet data and sent to the F1 / D4 # 1-3_INS 31a, and the overhead byte multiplexing unit 34a mainly stores the D4 # 1-3 bytes which are the station number calling packet data. The signal is mapped (multiplexed) to the signal and transmitted to the opposite station according to the OW connection route table.

  FIG. 9 shows the format of the station number calling packet data. In the figure, the receiving device ID (destination device), the transmission device ID (transmission source device), the status (CALL / RESET, ACK / BUSY), and the cross-connect information (XC) are stored after the synchronization bit. Finally, the FCS for error detection is stored. The status CALL is attached to the transmission data of the originating station to indicate a call, and RESET is attached to the transmission data of the originating station to indicate a call reset. ACK is attached to the transmission data of the receiving station to indicate transmission permission, and BUSY is attached to the transmission data of the receiving station to indicate busy.

  The station B and station c transmission devices that have received the above station number call packet data extract D4 # 1-3 bytes by the F1 / D4 # 1-3_FF 31b of the OW connection route / call control unit 31, and send them to the microcomputer 40. Notice. In response to this notification, the microcomputer 40 detects the station number coincidence. However, since the station numbers are different, it is sent to the F1 / D4 # 1-3_INS 31a as it is, and the overhead byte multiplexing unit 34a maps the D4 # 1-3 bytes to the main signal to the opposite station. Send. Further, through connection of # 1 to # 1 is performed by the E1_XC card of the XC / adder 32, for example.

  The destination station (station d) extracts D4 # 1-3 bytes by F1 / D4 # 1-3_FF 31b of the OW connection route / call control unit 31 and notifies the microcomputer 40 of the extracted bytes. In response to this notification, the microcomputer 40 detects the station number coincidence, and the station number coincidence detection is coincident. Therefore, the ringback tone is transmitted, the maintenance operator calls, and the XC / adder 32, for example, the E1_XC card # 1-4W Connect. At the same time, ACK (transmission permission) is set in the status of the received station number calling packet data and sent to F1 / D4 # 1-3_INS 31a, and D4 # 1-3 bytes are mapped to the main signal and transmitted by the overhead byte multiplexing unit 34b. Return to the station.

  When the transmitting station receives the station number calling packet data (ACK) returned from the receiving station, the transmitting station establishes 4W- # 1 connection with the E1_XC card of the E1 / E2 switching unit 36. As a result, the route of the audio signal is secured, and the transmitting station can receive the ringback tone of the receiving station.

  In addition, when the maintenance staff of the receiving station is in a call with another station, BUSY is set in the status of the station number call packet data received from the receiving station and returned, and a busy tone is generated to the maintenance staff of the transmitting station.

  When the maintenance person at the receiving station notices the call operation and off-hooks the telephone 39, the call operation is canceled and a call between the maintenance persons (stations a and d) becomes possible.

  FIG. 10 shows an embodiment of a maintenance person calling operation in each transmission apparatus. As shown in the figure, when the connection route is created, the LED blinks in green, and the voice line (E1 / E2 byte) cannot talk. When the maintenance person calls, the LED is lit in green and the voice line sends a ringback tone. At the time of connection (call), the LED is lit in green and the voice line can talk. During use (busy), the LED is lit in green and the voice line sends a busy tone.

  After that, FIG. 11 shows the state of the order wire circuit section of the transmitting station (station a) in a call state in which the maintenance person at station d is off-hooking the telephone 39, and the order wire circuit section of the slave stations (stations b and c). 12 shows the state of the order wire circuit unit of the receiving station (d station). FIG. In FIG. 11 to FIG. 13, the voice flow is represented by a bold solid line.

  In FIG. 11, the voice from the telephone set 39 is digitized by the CODEC 33, supplied to the overhead byte multiplexing unit 34a by the 4C- # 1 connection of the XC / adder unit 32 by, for example, the E1_XC card, and multiplexed to the E1 # 1 byte, for example. The Also, the audio data separated from the E1 # 1 byte by the overhead byte demultiplexing unit 35a is supplied to the CODEC 33 via the # 1-4W connection by the E1_XC card of the XC / adder 32, converted into an analog form, and supplied to the telephone set 39. Pronounced.

  In FIG. 12, the audio data separated from the E1 # 1 byte by the overhead byte demultiplexing units 35a and 35b is supplied to the overhead byte multiplexing unit 34a through the # 1- # 1 through connection by the E1_XC card of the XC / adder 32. Are multiplexed into E1 # 1 bytes and transmitted. As described above, the station b and the station c pass through the order wire audio data, and they are DA-converted by the CODEC 33 as in the prior art, and are not analog-added and then AD-converted. For this reason, it is possible to prevent the sound quality from being deteriorated due to the accumulation of quantization noise caused by repeating AD conversion.

  In FIG. 13, the audio data separated from the E1 # 1 byte by the overhead byte demultiplexing unit 35 b is supplied to the CODEC 33 via the # 1-4W connection by the E1_XC card of the XC / adder 32, converted into an analog signal, and sent to the telephone set 39. Supplied and pronounced. Also, the voice from the telephone set 39 is digitized by the CODEC 33, supplied to the overhead byte multiplexing unit 34a via the 4W- # 1 connection by the E1_XC card of the XC / adder 32, and multiplexed to the E1 # 1 byte.

<Multiple calls on the same line>
Next, an operation for enabling multiple calls while avoiding interference on the same line will be described. A case will be described in which the maintenance person between the station a and the station d uses the order wire line when the maintenance person between the stations a and d uses the order wire line (E1 # 1 byte).

  When the maintenance person of the transmission station (station b) off-hooks the telephone set 39 (push phone), the transmission station becomes the master and starts creating an OW connection route table. First, the microcomputer 40 of the master station sets its own station number (device ID), interface number (INF n), and status (ACT) in the route search packet data and inserts them into the F1 # 1-3 bytes. Send to opposite station (slave station).

  Station a that has received the route search packet data is a terminal station, so it adds its own device information (station number, interface number, status) next to the device information of station b, and adds an end flag (route termination) to transmit. Return to station (station b).

  The station c that has received the route search packet data adds its own device information (station number, interface number, status) after the device information of the station b and sends it to the opposite station (d station).

  Since the station d that has received the route search packet data is a terminal station, it adds its own device information (station number, interface number, status) after the device information of station c, and adds an end flag (route termination) to transmit. Return to station (station b).

  The transmitting station (station b) creates an OW connection route table based on the route search packet data returned from the station a and the route search packet data returned from the station d. During the creation of the OW connection route table, the LED is informed to the maintenance person.

  The maintenance person of the transmitting station (station b) starts the station number calling operation by dialing the device ID “# 003” of the calling station (station c) from the telephone 39 or NMS. The originating station sets its own station number (b station number) and destination station number (c station number) in the station number calling packet data, multiplexes it into D4 # 1-3 bytes, and sends it to the opposite station (c station) according to the OW connection route table. .

  Since the station number coincidence detection coincides with the receiving station (station c), ringback tone transmission, maintenance operator call operation, and E2_XC card of the XC / adder 32 connect # 2-4W. Here, the connection of # 2-4W is performed because the E1 # 1 byte is already used for the order wire between the a station and the d station, and the E1 # 2 byte is not used.

  Furthermore, ACK (transmission permission) is set in the status of the received station number call packet data, multiplexed to D4 # 1-3 bytes, and returned to the transmitting station (station b).

  When the transmitting station (station b) receives the returned station number calling packet data (status = ACK), it connects # 2-4W with the E1_XC card of the XC / adder 32. As a result, the route of the audio signal is secured and the ringback tone of the receiving station can be received. When the maintenance person at the receiving station notices the call operation and off-hooks the telephone 39, the call operation is canceled and a call between the maintenance persons (stations b and c) becomes possible.

  Thereafter, FIG. 14 shows a state of the order wire circuit unit of the transmitting station (station b) in a state where the maintenance person of the station c has off-hooked the telephone 39, and FIG. 15 shows a state of the order wire circuit unit of the receiving station (c). Shown in In FIG. 14 and FIG. 15, the voice flow is represented by a bold solid line.

  In FIG. 14, the voice from the telephone set 39 is digitized by the CODEC 33, supplied to the overhead byte multiplexing unit 34a by the 4C- # 2 connection of the XC / adder unit 32 using, for example, an E1_XC card, and multiplexed to E1 # 2 bytes, for example. The Also, the audio data separated from the E1 # 2 byte by the overhead byte demultiplexing unit 35a is supplied to the CODEC 33 via the # 2-4W connection by the E1_XC card of the XC / adder unit 32, converted into analog, and supplied to the telephone set 39. Pronounced. Similarly to FIG. 12, the audio data separated from the E1 # 1 byte by the overhead byte demultiplexing units 35a and 35b is the overhead byte multiplexing unit by the # 1- # 1 through connection by the E1_XC card of the XC / adder 32. 34a is multiplexed into E1 # 1 bytes and transmitted.

  In FIG. 15, the audio data separated from the E1 # 2 byte by the overhead byte demultiplexing unit 35b is supplied to the CODEC 33 via the # 2-4W connection by the E1_XC card of the XC / adder 32, and is converted into an analog signal to the telephone set 39. Supplied and pronounced. Also, the voice from the telephone set 39 is digitized by the CODEC 33, supplied to the overhead byte multiplexing unit 34a via the 4W- # 2 connection by the E1_XC card of the XC / adder 32, and multiplexed to the E1 # 2 byte. Similarly to FIG. 12, the audio data separated from the E1 # 1 byte by the overhead byte demultiplexing units 35a and 35b is the overhead byte multiplexing unit by the # 1- # 1 through connection by the E1_XC card of the XC / adder 32. 34a is multiplexed into E1 # 1 bytes and transmitted.

  In this manner, a plurality of inter-maintenance calls (point-to-point) can be performed on the same line (same line).

<Ring protection function and ring restoration function>
FIG. 16 shows a block diagram of an embodiment of a mesh-configured order wire network. The network illustrated in FIG. 16A is configured in a mesh shape with transmission devices having device IDs 001 to 009. Here, a station indicated by a thick arrow is a transmitting station (master station). As shown in FIG. 16B, the transmission device of each station has all or part of the interface INF1 facing right, the interface INF2 facing downward, the interface INF3 facing left, and the interface INF4 facing upward. The device ID is shown in the center.

  In FIG. 16A, the transmitting station (device ID = 001) has its own station number (device ID) and interface for F1 / D4 # 1-3_INS 31a of interface INF1 and F1 / D4 # 1-3_INS 31a of interface INF2, respectively. Route search packet data having number (INF n) and status (ACT) is set, multiplexed to F1 # 1-3 bytes, and output to lines # 1 and # 3.

  The station (device ID = 002) extracts route search packet data at F1 / D4 # 1-3_FF 31b of INF3 and notifies the microcomputer 40 of the route search packet data. The microcomputer 40 determines that INF3 is a reception INF, and adds route search packet data in which device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1-3_INS31a of INF1, which is an INF other than the reception INF. And INF2 F1 / D4 # 1-3_INS 31a, respectively, and output to line # 2 and line # 4.

  The station (device ID = 004) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF4 is received INF, and routes search packet data in which device information (station number, interface number, status) of the own station is additionally written is F1 / D4 # 1-3_INS 31a of INF1, which is an INF other than the received INF. Set to F1 / D4 # 1-3_INS 31a of INF2 and output to line # 6 and line # 8.

  The station (device ID = 003) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines INF3 as the reception INF, and adds route search packet data in which the device information (station number, interface number, status) of the own station is added to the F1 / D4 # 1-3_INS 31a of the INF2, which is an INF other than the reception INF. Set and output to line # 5.

  The station (device ID = 005) extracts the packet data at F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the last-arrived INF4, the microcomputer 40 stores the route search packet data in which the device information (station number = 005, interface number = INF4, status = STBY) and end flag (route end) of the own station are added to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 4. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 002). Similarly, route search packet data having an end flag transmitted from the INF2 of the station (device ID = 002) passes through the station (device ID = 005) and the station (device ID = 004) to the station (device ID = 001). Sent.

  Further, the microcomputer 40 of the station (device ID = 005) adds route search packet data in which the device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1-3_INS 31a of INF1 other than INF3 and INF4. And INF2 F1 / D4 # 1-3_INS 31a, and output to line # 7 and line # 9.

  The station (device ID = 007) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF4 is received INF, and sends route search packet data in which device information (station number, interface number, status) of its own station is added to F1 / D4 # 1-3_INS 31a of INF1, which is an INF other than the received INF. Set and output to line # 11.

  The station (device ID = 006) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the last-arrived INF4, the microcomputer 40 sends route search packet data in which the device information (station number = 006, interface number = INF4, status = STBY) and end flag (route end) of the own station are additionally written to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 5. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 003) and the station (device ID = 002). Similarly, route search packet data having an end flag transmitted from INF2 of the station (device ID = 003) is routed through the station (device ID = 006), the station (device ID = 005), and the station (device ID = 004). It is transmitted to the station (device ID = 001).

  Further, the microcomputer 40 of the station (device ID = 006) adds the route search packet data in which the device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1-3_INS 31a of INF2 other than INF3 and INF4. And output to line # 10.

  The station (device ID = 008) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the later-arrived INF4, the microcomputer 40 sends the route search packet data in which the device information of the own station (station number = 008, interface number = INF4, status = STBY) and end flag (route end) are additionally written to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 9. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 005) and the station (device ID = 004). Similarly, route search packet data having an end flag transmitted from INF2 of the station (device ID = 005) is passed through the station (device ID = 008), the station (device ID = 007), and the station (device ID = 004). It is transmitted to the station (device ID = 001).

  Further, the microcomputer 40 of the station (device ID = 008) adds route search packet data in which the device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1-3_INS 31a of INF1 other than INF3 and INF4. And output to line # 12.

  The station (device ID = 009) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the later-arrived INF4, the microcomputer 40 stores the route search packet data in which the device information of the own station (station number = 009, interface number = INF4, status = STBY) and end flag (route end) are added to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 10. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 006), the station (device ID = 005), and the station (device ID = 004). Similarly, route search packet data having an end flag transmitted from the INF2 of the station (device ID = 006) is the station (device ID = 009), the station (device ID = 008), the station (device ID = 007), the station ( It is transmitted to the station (apparatus ID = 001) via the apparatus ID = 004).

  The microcomputer 40 of the master station (device ID = 001) receives a plurality of route search packet data having the above-described end flag, and creates an OW connection route table as shown in FIG. In FIG. 17, the first route passing through the stations with device IDs 001, 002, 003, the second route passing through the stations with device IDs 001, 004, 005, 006, and the device IDs 001, 004, 007, 008, It has a third route through each station of 009. All of the first to third routes do not form a loop, and therefore no howling occurs.

  FIG. 18 shows a flowchart of an embodiment of route search processing executed by the microcomputer 40 of the transmission device of each station other than the transmitting station. In step S1, the receiving interface for route search packet data is determined with first-come-first-served priority.

  Route in which device information (station number, interface number of late INF, STBY) and end flag (route end) added to end interface that received route search packet data but was not confirmed as reception INF in step S2 Search packet data is sent back to the originating station from the last interface.

  In step S3, only when there is a faulty interface, the device information (station number, ALM interface number of ALM, ALM) and end flag (route termination) of the interface where the alarm is detected are received in the route search packet data. Add and return to the source station from the confirmed receiving interface.

  In step S4, route search packet data that has not received the route search packet data and additionally includes device information (station number, ACT interface number of ACT, ACT) of the interface of status = ACT is added to the status = ACT. Transmit from the interface to the opposite station.

  In step S5, when the route search packet data with the end flag (route termination) added is returned to the interface that transmitted the route search packet data, the status of the interface is changed to STBY.

<Relief action when a failure occurs>
Next, as shown in FIG. 19, a case will be described in which a failure occurs in line # 7 between the station with device ID = 005 and the station with device ID = 006.

  The status of INF1 of the station (device ID = 005) is ALM, and the microcomputer 40 sets packet data having status = ALM in F1 / D4 # 1-3_INS 31a of INF4 in order to notify the alarm of INF1. Output to # 4. This alarm notification packet data is transmitted to the station (device ID = 001) via the station (device ID = 005) and the station (device ID = 004).

  Based on the status information of the alarm notification packet data, the transmitting station (device ID = 001) sends its own station number (device) to F1 / D4 # 1-3_INS31a of interface INF1 and F1 / D4 # 1-3_INS31a of interface INF2. Route search packet data having ID), interface number (INF n), and status (ACT) is set, multiplexed to F1 # 1-3 bytes, and output to lines # 1 and # 3.

  The station (device ID = 002) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF3 is a reception INF, and sends route search packet data in which device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1-3_INS 31a of INF1, which is an INF other than the reception INF. Set to F1 / D4 # 1-3_INS 31a of INF2 and output to line # 2 and line # 4.

  The station (device ID = 004) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF4 is received INF, and routes search packet data in which device information (station number, interface number, status) of the own station is additionally written is F1 / D4 # 1-3_INS 31a of INF1, which is an INF other than the received INF. Set to F1 / D4 # 1-3_INS 31a of INF2 and output to line # 6 and line # 8.

  The station (device ID = 003) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines INF3 as the reception INF, and adds route search packet data in which the device information (station number, interface number, status) of the own station is added to the F1 / D4 # 1-3_INS 31a of the INF2, which is an INF other than the reception INF. Set and output to line # 5.

  The station (device ID = 005) extracts the packet data at F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the last-arrived INF4, the microcomputer 40 stores the route search packet data in which the device information (station number = 005, interface number = INF4, status = STBY) and end flag (route end) of the own station are added to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 4. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 002). Similarly, route search packet data having an end flag transmitted from the INF2 of the station (device ID = 002) passes through the station (device ID = 005) and the station (device ID = 004) to the station (device ID = 001). Sent.

  The microcomputer 40 (device ID = 005) receives route search packet data having device information (station number = 005, interface number = INF1, status = ALM) of INF1 and an end flag (route termination), and F1 of INF3. / D4 # 1-3_INS 31a and output to line # 6. The route search packet data of status = ALM having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 005) and the station (device ID = 004).

  Further, the microcomputer 40 of the station (device ID = 005) adds route search packet data in which device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1- of INF2, which is an INF other than the above. Set to 3_INS 31a and output to line # 9.

  The station (device ID = 007) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF4 is received INF, and sends route search packet data in which device information (station number, interface number, status) of its own station is added to F1 / D4 # 1-3_INS 31a of INF1, which is an INF other than the received INF. Set and output to line # 11.

  The station (device ID = 006) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF4 and notifies the microcomputer 40 of the packet data. The microcomputer 40 determines that INF4 is received INF, and sends route search packet data in which device information (station number, interface number, status) of the own station is added to F1 / D4 # 1-3_INS 31a of INF2, which is an INF other than the received INF. Set and output to line # 10.

  Further, the microcomputer 40 of the station (device ID = 006) transmits route search packet data having device information (station number = 005, interface number = INF1, status = ALM) and end flag (route end) of INF3 to F1 / F4 of INF4. Set to D4 # 1-3_INS 31a and output to line # 5. The route search packet data of status = ALM having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 003) and the station (device ID = 002).

  Further, the microcomputer 40 of the station (device ID = 006) adds route search packet data in which device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1- of INF2, which is an INF other than the above. Set to 3_INS 31a and output to line # 10.

  The station (device ID = 008) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the later-arrived INF4, the microcomputer 40 sends the route search packet data in which the device information of the own station (station number = 008, interface number = INF4, status = STBY) and end flag (route end) are additionally written to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 9. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 005) and the station (device ID = 004). Similarly, route search packet data having an end flag transmitted from INF2 of the station (device ID = 005) is passed through the station (device ID = 008), the station (device ID = 007), and the station (device ID = 004). It is transmitted to the station (device ID = 001).

  Further, the microcomputer 40 of the station (device ID = 008) adds route search packet data in which device information (station number, interface number, status) of the own station is additionally written to F1 / D4 # 1- of INF1, which is an INF other than the above. Set to 3_INS 31a and output to line # 10.

  The station (device ID = 009) extracts the packet data by F1 / D4 # 1-3_FF 31b of INF3 and INF4 and notifies the microcomputer 40 of the packet data. If the statuses of INF3 and INF4 are the same, the microcomputer 40 determines, for example, INF3 as reception INF as the first-come-first-served priority. For the later-arrived INF4, the microcomputer 40 stores the route search packet data in which the device information of the own station (station number = 009, interface number = INF4, status = STBY) and end flag (route end) are added to F1 / D4 of INF4. Set to # 1-3_INS 31a and output to line # 10. The route search packet data having this end flag is transmitted to the station (device ID = 001) via the station (device ID = 006), the station (device ID = 003), and the station (device ID = 002). Similarly, route search packet data having an end flag transmitted from the INF2 of the station (device ID = 006) is the station (device ID = 009), the station (device ID = 008), the station (device ID = 007), the station ( It is transmitted to the station (apparatus ID = 001) via the apparatus ID = 004).

  The microcomputer 40 of the master station (device ID = 001) receives the route search packet data having the above end flag, and creates an OW connection route table as shown in FIG. In FIG. 20, the first route passing through the stations with the device IDs 001, 002, 003, 006, the second route passing through the stations with the device IDs 001, 004, 005, and the device IDs 001, 004, 007, 008, It has a third route through each station of 009. All of the first to third routes do not form a loop, and therefore no howling occurs.

  In this way, when a failure occurs in line # 7, the OW connection route table in FIG. 17 can be automatically changed to the OW connection route table in FIG.

<Ring protection function and ring restoration function in dual ring configuration>
FIG. 21 shows a block diagram of an embodiment of an order wire network having a dual ring configuration. A station indicated by a thick arrow is a transmitting station.

  The transmission device of the source station (transmission device NE1) becomes the master station, and the route search packet data in which the device information of the own station (station number, interface number, status of the own station) is inserted into the F1 # 1-3 bytes are all output ports. Output from.

  The transmission apparatus that has received the route search packet data adds its own apparatus information and transmits it from all output ports other than the reception INF. A transmission apparatus that receives route search packet data from a plurality of INFs at the same time prioritizes first arrival if there is no alarm in the reception INF and determines the reception INF. Then, the device information of the own station is added and transmitted from all output ports other than the reception INF.

  The transmission apparatus having no transfer destination traces the route search packet data to which the end flag is added in the reverse order of the searched route and returns it to the master station.

  The master station (transmission device NE1) creates the OW connection route table shown in FIG. 22 based on the return information. In the OW connection route table, a route with status = ACT is an order wire line (call packet line / voice line) route where no howling occurs. In FIG. 22, there is a first route that passes through the stations with device IDs 001, 002, 005, and 006, and a second route that passes through the stations with device IDs 001, 004, 003, 008, and 007.

  Also, the route search packet data is transmitted periodically even during a call by the maintenance person to update the OW connection route table to always secure the OW line route.

  Here, as shown in FIG. 23, when a line failure occurs in the line connecting the station (NE2) and the station (NE5), the originating station (NE1) becomes a starting point based on the alarm information of the station (NE2), Recreate the OW connection route table.

  As a result, the master station (NE1) creates the OW connection route table shown in FIG. 24 based on the return information. In FIG. 24, a first route passing through each station having a device ID of 001,002, a second route passing through each station having a device ID of 001,004,003,008,007, and a device ID of 001,004,003,008, It has a third route passing through stations 005 and 006.

  That is, for the station (NE5) that was isolated due to a line failure in the line connecting the station (NE2) and the station (NE5), in FIG. 22, the status between INF4 of the station (NE8) and INF2 of the station (NE5) In FIG. 24, the status between INF4 of the station (NE8) and INF2 of the station (NE5) can be changed to ACT in FIG. 24, and the isolated station (NE5) is automatically relieved. can do.

<Other configurations>
FIG. 25 shows a block diagram of an embodiment of an order wire network having a linear configuration. A station indicated by a thick arrow is a transmitting station. That is, stations with device IDs 001, 002, 003, 004 are linearly connected. In this case, the transmitting station (device ID = 001) creates the OW connection route table shown in FIG. 26 based on the route search packet data returned from the slave station (device ID = 004).

  FIG. 27 shows a block diagram of an embodiment of an order wire network having a line redundancy configuration. A station indicated by a thick arrow is a transmitting station. That is, the stations with the device IDs 001, 002 are connected with INF1 as the 0 system and INF2 as the 1 system. In this case, the transmission station (device ID = 001) creates the OW connection route table shown in FIG. 28 based on the route search packet data returned from the slave station (device ID = 002). Note that the slave station (device ID = 002) sets INF1 that has received the route search packet data first among INF1 and INF2 to be ACT, that is, the 0 system (active system), and INF2 that has received the route search packet data later to STBY, that is, the 1 system ( (Preliminary system).

  FIG. 29 shows a block diagram of an embodiment of an order wire network with a REG configuration. A station indicated by a thick arrow is a transmitting station. That is, a REG configuration is provided in which a station b and a station c having relay apparatuses with device IDs 002 and 003 are provided between stations a and d having a transmission device with a device ID 001,004. In this case, the transmitting station (device ID = 001) creates the OW connection route table shown in FIG. 30 based on the route search packet data returned from the slave station (device ID = 004). In FIG. 30, INF3 with device ID = 001 and INF2 and INF3 with device ID = 004 are STBY. As a result, the INF1 side of the device ID = 001 becomes the 0 system (active system), and the INF2 side of the device ID = 001 becomes the 1 system (standby system).

  FIG. 31 shows a configuration diagram of an embodiment of an order wire network having a UPSR (Uniformal Path Switched Ring) configuration. A station indicated by a thick arrow is a transmitting station. That is, stations with device IDs 001, 002, 003, and 004 are connected in a ring shape. In this case, the transmitting station (device ID = 001) creates the OW connection route table shown in FIG. 32 based on the route search packet data returned from the slave station (device ID = 003).

FIG. 33 shows a block diagram of an embodiment of an order wire network having a BLSR (Bidirectional Line Switched Ring) configuration. A station indicated by a thick arrow is a transmitting station. That is, stations with device IDs 001, 002, 003, and 004 are connected in a ring shape. In this case, the transmission station (device ID = 001) creates the OW connection route table shown in FIG. 34 based on the route search packet data returned from the slave station (device ID = 003).
(Appendix 1)
In an order wire control method for making a call between transmission devices constituting a synchronous network,
The transmission device of the transmission station transmits the route search packet data in which the device information of the local station is set in the first byte of the overhead of the synchronous transfer signal,
The transmission device that has received the route search packet data adds the device information of the local station to the received route search packet data when there is a transmission destination, and transmits it to the received route search packet data when there is no transmission destination. Add device information and termination information of own station and send it back to the source station,
The transmitting station transmission device creates an order wire connection route table based on device information of a plurality of transmission devices set in route search packet data returned from the terminal transmission device,
The transmitting station transmission device transmits the station number calling packet data addressed to the receiving station transmission device based on the order wire connection route table in the second byte of the overhead of the synchronous transfer signal,
The transmission apparatus of the receiving station that has received the station number calling packet data cross-connects the third byte of the overhead of the synchronous transfer signal to the telephone, and returns the station number calling packet data to the originating station.
The transmission apparatus of the originating station that has received the returned station number call packet data cross-connects the third byte to the telephone,
An order wire control method comprising: connecting an order wire line between a transmitting station transmission device and a receiving station transmission device.
(Appendix 2)
In the order wire control method according to attachment 1,
The transmission device that has received the route search packet data from a plurality of interfaces uses the first interface among the plurality of interfaces as a reception interface, and the route search packet data received from the last interface includes device information and termination information of the own station. Added back to the calling station,
An order wire control method comprising: adding device information of a local station to route search packet data received from an interface that has not received the route search packet data, and transmitting the device information to an opposite station.
(Appendix 3)
In the order wire control method according to attachment 2,
When there is a faulty interface, the transmission device that has received the route search packet data adds the device information and termination information of the faulty local station to the route search packet data received from the reception interface, and sends it to the source station. An order wire control method, wherein the order wire is returned.
(Appendix 4)
In the order wire control method according to any one of appendices 1 to 3,
Allocating multiple bytes of synchronous transfer signal overhead to the third byte;
Each time there is a request for order wire line connection from the transmitting station transmission device, the unused byte among the third bytes of the plurality of bytes is selected and cross-connected to the telephone to perform the requested order wire line connection. An order wire control method characterized by the above.
(Appendix 5)
In a transmission apparatus that performs order wire control for making a call between transmission apparatuses constituting a synchronous network,
First transmission means for generating route search packet data in which device information of the own station is set and transmitting the first byte of the overhead of the synchronous transfer signal;
When there is a destination of the received route search packet data, the device information of the local station is added to the received route search packet data and transmitted, and received when there is no destination of the received route search packet data Second transmission means for adding device information and termination information of the local station to the route search packet data and returning it to the transmitting station;
Table creation means for receiving route search packet data including the returned termination information and creating an order wire connection route table based on device information of a plurality of transmission devices set in the route search packet data including the termination information When,
Third transmission means for transmitting the station number calling packet data addressed to the transmission apparatus of the terminating station based on the order wire connection route table in the second byte of the overhead of the synchronous transfer signal;
When the receiving station of the received station number calling packet data is its own device, the third byte of the overhead of the synchronous transfer signal is cross-connected to the telephone, and the first cross-connect returns the station number calling packet data to the transmitting station Means,
A second cross-connect means for cross-connecting the third byte to the telephone when the originating station of the returned station number calling packet data is the own device;
A transmission apparatus comprising:
(Appendix 6)
In the transmission apparatus according to attachment 5,
When the second transmission means receives the route search packet data from a plurality of interfaces, the first interface among the plurality of interfaces is set as a reception interface, and the route search packet data received from the last interface is added to the route search packet data. Means for adding station device information and termination information and returning to the originating station;
A transmission apparatus comprising: means for adding device information of the local station to route search packet data received from an interface that has not received the route search packet data and transmitting the information to the opposite station.
(Appendix 7)
In the transmission device according to attachment 6,
The second transmission means includes means for adding the device information and termination information of the faulty local station to the route search packet data received from the reception interface when there is a faulty interface and returning it to the source station. A transmission device characterized by the above.
(Appendix 8)
In the transmission device according to any one of appendices 5 to 7,
Allocating multiple bytes of synchronous transfer signal overhead to the third byte;
The first cross-connect means selects a byte that is not used among the third bytes of the plurality of bytes and cross-connects to the telephone each time an order wire line connection request is made from the transmission apparatus of the originating station. A characteristic transmission device.
(Appendix 9)
In the order wire control method according to any one of appendices 1 to 4,
3. The order wire control method according to claim 1, wherein the first byte is a section overhead F1 byte, the second byte is a section overhead D4 byte, and the third byte is a section overhead E1 byte and E2 byte.

It is a block diagram of an example of the order wire network of the conventional linear structure. It is a block diagram of an example of the order wire circuit part of the conventional transmission apparatus. It is a figure for demonstrating a ring protection function and a ring restoration function. It is a figure for demonstrating the ring protection function and ring restoration function of a dual ring structure. It is a block diagram of one Embodiment of the order wire network of a linear structure. It is a block diagram of one Embodiment of the order wire circuit part of a transmission apparatus. It is a figure which shows the frame format of the synchronous transfer signal STS-3 of SONET. It is a figure which shows the format of route search packet data. It is a figure which shows the format of station number calling packet data. It is a figure which shows one Embodiment of a maintenance person call operation | movement. It is a figure which shows the mode of the order wire circuit part of a transmission station. It is a figure which shows the mode of the order wire circuit part of a slave station. It is a figure which shows the mode of the order wire circuit part of a receiving station. It is a figure which shows the mode of the order wire circuit part of a transmission station. It is a figure which shows the mode of the order wire circuit part of a receiving station. It is a block diagram of one Embodiment of the order wire network of a mesh structure. It is a figure which shows the OW connection route table in FIG. It is a flowchart of one Embodiment of a route search process. It is a block diagram of one Embodiment of the order wire network (at the time of a failure) of a mesh structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network of a dual ring structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network (at the time of a failure) of a dual ring structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network of a linear structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network of a line redundancy structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network of a REG structure. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one embodiment of an order wire network of UPSR configuration. It is a figure which shows the OW connection route table in FIG. It is a block diagram of one Embodiment of the order wire network of a BLSR structure. It is a figure which shows the OW connection route table in FIG.

Explanation of symbols

31 OW connection route / call control unit 32 XC / addition unit 33 CODEC
34a, 34b Overhead byte multiplexing unit 35a, 35b Overhead byte demultiplexing unit 36 E1 / E2 switching unit 38 Hybrid 39 Telephone 40 Microcomputer 42 Ringback tone generating unit 43 Selector 44 DTMF receiving unit 45 Busy tone generating unit 46 Calling operation unit 47 Power feeding circuit

Claims (8)

In an order wire control method for making a call between transmission devices constituting a synchronous network,
The transmission device of the transmission station transmits the route search packet data in which the device information of the local station is set in the first byte of the overhead of the synchronous transfer signal,
The transmission device that has received the route search packet data adds the device information of the local station to the received route search packet data when there is a transmission destination, and transmits it to the received route search packet data when there is no transmission destination. Add device information and termination information of own station and send it back to the source station,
The transmitting station transmission device creates an order wire connection route table based on device information of a plurality of transmission devices set in route search packet data returned from the terminal transmission device,
The transmitting station transmission device transmits the station number calling packet data addressed to the receiving station transmission device based on the order wire connection route table in the second byte of the overhead of the synchronous transfer signal,
The transmission apparatus of the receiving station that has received the station number calling packet data cross-connects the third byte of the overhead of the synchronous transfer signal to the telephone, and returns the station number calling packet data to the originating station.
The transmission apparatus of the originating station that has received the returned station number call packet data cross-connects the third byte to the telephone,
An order wire control method comprising: connecting an order wire line between a transmitting station transmission device and a receiving station transmission device. The order wire control method according to claim 1,
The transmission device that has received the route search packet data from a plurality of interfaces uses the first interface among the plurality of interfaces as a reception interface, and the route search packet data received from the last interface includes device information and termination information of the own station. Added back to the calling station,
An order wire control method comprising: adding device information of a local station to route search packet data received from an interface that has not received the route search packet data, and transmitting the device information to an opposite station. In the order wire control method according to claim 2,
When there is a faulty interface, the transmission device that has received the route search packet data adds the faulty device information and termination information to the route search packet data received from the reception interface, and returns it to the source station. An order wire control method comprising: The order wire control method according to any one of claims 1 to 3,
Allocating multiple bytes of synchronous transfer signal overhead to the third byte;
Each time there is a request for order wire line connection from the transmitting station transmission device, the unused byte among the third bytes of the plurality of bytes is selected and cross-connected to the telephone to perform the requested order wire line connection. An order wire control method characterized by the above. In a transmission apparatus that performs order wire control for making a call between transmission apparatuses constituting a synchronous network,
First transmission means for generating route search packet data in which device information of the own station is set and transmitting the first byte of the overhead of the synchronous transfer signal;
When there is a destination of the received route search packet data, the device information of the local station is added to the received route search packet data and transmitted, and received when there is no destination of the received route search packet data Second transmission means for adding device information and termination information of the local station to the route search packet data and returning it to the transmitting station;
Table creation means for receiving route search packet data including the returned termination information and creating an order wire connection route table based on device information of a plurality of transmission devices set in the route search packet data including the termination information When,
Third transmission means for transmitting the station number calling packet data addressed to the transmission apparatus of the terminating station based on the order wire connection route table in the second byte of the overhead of the synchronous transfer signal;
When the receiving station of the received station number calling packet data is its own device, the third byte of the overhead of the synchronous transfer signal is cross-connected to the telephone, and the first cross-connect returns the station number calling packet data to the transmitting station Means,
A second cross-connect means for cross-connecting the third byte to the telephone when the originating station of the returned station number calling packet data is the own device;
A transmission apparatus comprising: The transmission apparatus according to claim 5, wherein
When the second transmission means receives the route search packet data from a plurality of interfaces, the first interface among the plurality of interfaces is set as a reception interface, and the route search packet data received from the last interface is added to the route search packet data. Means for adding station device information and termination information and returning to the originating station;
A transmission apparatus comprising: means for adding device information of the local station to route search packet data received from an interface that has not received the route search packet data and transmitting the information to the opposite station. The transmission apparatus according to claim 6, wherein
The second transmission means includes means for adding the device information and termination information of the faulty local station to the route search packet data received from the reception interface when there is a faulty interface and returning it to the source station. A transmission device characterized by the above. The transmission apparatus according to any one of claims 5 to 7,
Allocating multiple bytes of synchronous transfer signal overhead to the third byte;
The first cross-connect means selects a byte that is not used among the third bytes of the plurality of bytes and cross-connects to the telephone each time an order wire line connection request is made from the transmission apparatus of the originating station. A characteristic transmission device.

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