JPH0951334A - Cell transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer the state change of a signal line on the transmission-side without a delay by detecting the transition of a signaling bit state, generating a signaling cell, setting the bit state in a reception cell and setting the state to a detected one when time passes so as to transfer it. SOLUTION: Sound data from a terminal line is assembled into a sound cell by a sound cell assembly processing part 1. A signaling processing part 2 extracts signaling from the terminal line and assembles it into the signaling cell. A multiplex part 3 multiplexes the respective cells and transmits them to an ATM network-side line. A separation part 4 separates the sound cell received from the ATM network-side line and the signaling cell. The sound cell is transferred to a sound cell resolution processing part 5 and the signaling cell to the signaling processing part 2. The respective processing parts resolve the cells and transmit them to the terminal line. Thus, the state change of the signal line on the transmission-side can immediately be reproduced on the reception-side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell transfer method for transmitting signaling information of an individual line signal system or a common line signal system used for transmitting a voice or facsimile signal or the like via an ATM network. Is.

[0002]

2. Description of the Related Art FIG.
It is a figure which shows the structure of the ATM multiplexing apparatus which carries out the cell transfer of the signaling information of the conventional individual line signaling system shown by 0 in FIG. In the figure, 1 is a signaling processing unit that extracts signaling information of individual line signaling from a terminal line to make a cell, 2 is a voice cell assembly processing unit that assembles voice data from the terminal line into cells, and 3 is a signaling processing unit. 1 and the cells from the voice cell assembly processing unit 2 are multiplexed to form an ATM.
This is a multiplexing unit for sending to the network side line. FIG. 33 is a diagram showing a signaling cell transfer sequence. In the figure, reference numeral 16 is a signaling cell used for transferring signaling information of the individual line signaling system.

Next, the cell transfer operation of the device having the above configuration will be described. The voice cell assembly processing unit 2 assembles voice data from the terminal line into cells at regular intervals and transmits the cells to the multiplexing unit 3. On the other hand, the signaling processing unit 1 extracts the signaling information of the individual line signaling system from the terminal line, converts it into cells, and transmits the cells to the multiplexing unit 3. The multiplexing unit 3 multiplexes the cells from the signaling processing unit 1 and the voice cell assembly processing unit 2 and sends them to the ATM network side line. Next, a method of transferring a signaling cell in the signaling processing unit 1 will be described with reference to FIG.
3 will be described. When it is detected that the state of the individual line signal from the terminal line changes from on-hook to off-hook (the state value of the individual line signal line is 1 → 0), the off-hook cell 16g-1 is transmitted. After off-hook state transition,
The dial information for each fixed time period T is collected, and the dial information cell 16h-1 is transmitted. In FIG. 33, since the dial "5" and the dial "3" exist within the fixed time period T, for example, 500 ms to 1 sec, the information indicating the dials "5" and "3" is stored in the dial information cell 16h.
Set to -1. The receiving side reproduces the dial pulses "5" and "3" from this information. After that, when the change point from off-hook to on-hook (state value of the signal line of the individual line is 0 → 1) is detected, the on-hook cell 16j-1 is transmitted.

[0004]

As described above, according to the conventional cell transfer method, since the dial pulse is monitored every fixed time period and the dial information within the cycle time is made into a cell, for example, the cell is transferred after 1 second. Therefore, there is a problem that the processing delay required for cell formation is large and the call setup time between end-to-end becomes long. Further, there is a problem that there is no means for notifying the terminal side of the occurrence of a failure on the ATM network.

A cell transfer method according to the present invention has been made to solve the above problems, and an object thereof is to obtain a cell transfer method in which a transfer processing delay of a dial pulse is small when a signaling cell is formed. Another object of the present invention is to obtain a cell transfer method for notifying the terminal side of the occurrence of a failure on the ATM network.

[0006]

In a transfer method in an ATM network according to the present invention, a transmitting side extracts a signaling bit indicating a change in the state of a signal line from each terminal channel and stores it in a corresponding channel register for multiplexing. And the transition state of the signaling bit for each channel stored in this register is monitored and a state transition is detected, a signaling cell carrying a time signal (time stamp) based on the detection state and the detection time is generated. Step, and when the receiving side receives the signaling cell,
The step of setting the state of the signaling bit in the signaling setting register of the corresponding channel according to the rule corresponding to the transmitting side, and the setting register is received when the time of the time signal in the received signaling cell has passed after setting the state in the setting register. The method comprises the steps of setting the detected state in the signaling cell and transferring the state of each signaling bit of the setting register to each terminal channel.

Furthermore, the signaling cell on the transmitting side is
A step of generating a plurality of state change point information generated for each corresponding channel and including a detection state and a detection time in one signaling cell, and receiving the signaling cell on the receiving side, When the state change point information is detected, the step of setting the state of the signaling bit in the setting register and the step of setting the state of the detection bit after the elapse of the time signal are repeated a plurality of times according to the plurality of pieces of information.

Alternatively, on the transmitting side, the state of the signal line from each terminal channel is monitored, and when the change from the call disconnection state to the busy state or the change from the call state to the disconnected state is detected, this state change is detected. Generating a first signaling cell shown in the figure, extracting a signaling bit indicating a dial pulse of a signal line of the channel and storing it in a corresponding channel register for multiplexing, and dialing a signaling bit for each channel stored in the register. A step of generating a second signaling cell carrying a time signal based on the detection state and the detection time when the state of the pulse is monitored and a state transition is detected, and a first signaling cell showing a state change on the receiving side. Receiving a second signaling cell, the step of transferring the state change of the signal line to the corresponding channel when receiving Then, the step of setting the state of the signaling bit in the signaling setting register of the corresponding channel according to the rule corresponding to the transmitting side, and after the state setting in the setting register, when the time of the received time signal in the second signaling cell has elapsed , Setting the setting register to the detected state in the received second signaling cell, and transferring the state of each signaling bit of the setting register to each terminal channel.

Furthermore, when the transmitting side detects the dial pulse and does not detect the next pulse after a fixed time, the step of transmitting the third signaling cell and the receiving side receiving the third signaling cell. Then, after the dial pulse transferred to the terminal side, a step of transferring a predetermined signal after a predetermined time is added.

Furthermore, on the transmitting side, the speed of the dial pulse is measured and the speed information is added to the second signaling cell, and on the receiving side, when the second signaling cell is received, it is added in the cell. The dial pulse corresponding to the speed information was created and transferred to the corresponding channel.

Furthermore, the second signaling cell is generated on the transmitting side for each corresponding channel, and the number of dialing pulses for a certain period of time is mounted in one signaling cell to generate the second signaling cell. Then, the second signaling cell is received and the predetermined dialing pulse is transferred to the corresponding channel according to the number of the detected dialing pulses.

Further, on the transmitting side, when the transmission state continues for each channel and there is no state transition, a signaling cell carrying the identifier and state information of each channel without the above state transition multiplexed in the same virtual path is provided. On the receiving side, when a signaling cell carrying state information is received, the receiving side adds a step of confirming normal transfer of each channel from each channel identifier and the state information in the cell.

Alternatively, an OAM (Operation And Mainten
ance) cell field AIS code or FERF
When receiving a cell with a code, a step of temporarily storing the value of the signaling bit setting register of each terminal channel multiplexed in the virtual channel, and then notifying each terminal by setting the value of the setting register to the alarm state,
When no OAM cell having an AIS code or a FERF code is received for a predetermined time, or when a valid signal cell is received in the above-mentioned alarm state, the value of the signaling bit setting register is returned to the temporarily stored value, and each terminal is notified. , A step of transmitting a signaling cell in which a field value describes a signaling value from each terminal line to each corresponding channel with which each terminal is communicating with each other.

In addition to the above basic method, the system
When a cell with an AIS code in the AM cell field is received, FER is entered in the field for the virtual channel.
Transmitting an OAM cell containing an F code,
Each of the terminals managed by the ATM multiplexer transmits the signaling cell whose field value is described as being communicated to each corresponding channel which is in communication with each other, and the step of stopping the transmission of the voice cell if necessary. Added.

Alternatively, the AI is set in the field of the OAM cell which is the alarm information for the virtual channel from the system.
When a cell having an S code or a FERF code is received, the call of each terminal being received is initialized, and an initialization message by the common line signaling method is applied to each terminal channel multiplexed in the virtual channel in the terminal direction. In the state where the cell having the AIS code or the FERF code is received, the step of discarding the signaling information of the common line signaling method other than the disconnection message from each terminal, and the OAM cell having the AIS code or the FERF code. If it does not receive after a predetermined time, or when a valid signal cell is received in the alarm state, a step of notifying the cell assembly processing unit that the alarm state has been released, and a message from each terminal after the alarm release state , The steps to start cell assembly and send cells to the network. I was painting.

In addition to the above basic method, the system
When a cell having an AIS code in the AM cell field is received, F field is entered for the virtual channel.
A step of transmitting an OAM cell containing an ERF code is added.

[0017]

In the transfer method in the ATM network according to the present invention, the transmitting side extracts and stores the signaling bit, detects the transition of the signaling bit, immediately transmits the cell with the state and the time stamp, and the receiving side transmits the cell. During the state detection, the state of the signaling bit of the channel is set, and after the time stamp has elapsed, the signaling bit is transferred to each terminal channel. Therefore, the state change of the signal line on the transmitting side is immediately reproduced on the receiving side.

Further, the transmitting side stores and transmits a plurality of state change point information in which a detection state and a detection time are paired in one signaling cell, and the receiving side transmits a plurality of state change point information from this cell. Detected and the state changes of the plurality of signal lines are sent to the terminal. Therefore, the state change on the transmitting side is immediately reproduced on the receiving side with a small number of cells.

Alternatively, further change to an off-hook state,
In the case of detecting the change to the on-hook state, signaling cells are also transmitted, and the receiving side reproduces the same state corresponding to these cells.

Further, even if the next pulse is not detected after a fixed time after the dial pulse is detected, a signaling cell is transmitted, and the receiving side reproduces the dial pulse after a predetermined time following the previous dial pulse. To be done. Therefore, the minimum pause between dial digits is maintained.

Further, the speed information of the dial pulse is also transmitted in the signaling cell, so that the receiving side creates a dial pulse of a predetermined speed and transfers it to the corresponding channel. Therefore, the information on the transmitting side is immediately transmitted to the receiving side and reproduced with a small number of cells.

Furthermore, information on a plurality of dial pulses is stored and sent in one cell on the transmitting side, and correspondingly restored on the receiving side. Therefore, the information on the transmission side is immediately sent to the reception side and reproduced with fewer cells.

Furthermore, a cell carrying state information of a plurality of channels indicating normal transmission on the transmitting side is sent at regular intervals,
On the receiving side, normal communication on multiple channels can be confirmed with a small number of cells.

Or from the system to the field AIS
When you receive a cell with a code or a FERF code,
It is possible to detect that the terminal is in the VP-AIS or VP-FERF state, notify each terminal, and stop communication in the alarm state.
In addition, the alarm condition is being monitored and the AIS cell or FERF is being monitored.
If the cell does not arrive for a certain period of time, it is considered that the alarm state is released, and the transmission of the signal cell is restarted.

Or from the system to the field AIS
When a cell with a code is received, it notifies another multiplexer that it is in the VP-FERF state.

Alternatively, when a cell having an AIS code or a FERF code in the field is received from the system by the common signal channel system, VP-AIS or VP-F is received.
It is possible to detect each terminal in the ERF state and notify each terminal, and as a general rule, communication in the alarm state can be stopped. Also, if the alarm state is monitored and the AIS or FERF cell does not arrive for a certain period of time, the alarm state is released and the transmission of the signal cell is restarted.

Alternatively, when a cell having an AIS code in the field is received from the system by the common line signal channel system, the other multiplexing apparatus is notified that it is in the VP-FERF state.

[0028]

【Example】

Embodiment 1 FIG. The cell transfer system according to the first embodiment of the present invention will be described below. FIG. 1 is a block diagram of an ATM multiplexer of this embodiment. In the figure, 1 to 3 are the same as the conventional example. Reference numeral 4 is a separation unit that separates a voice cell and a signaling cell received from the ATM network side line. 5 is a separation unit 4
It is a voice cell disassembly processing unit that disassembles the voice cell from and sends it to the terminal line. FIG. 2 is a diagram showing a transfer format of signaling information (signaling bits) of an individual line signaling system, which is time-division multiplexed on a terminal line. FIG.
(B) shows the correspondence between the signaling bit corresponding to the terminal-side channel described later and the position stored in each frame in the multiframe. That is, the second to the seventh
It is stored in positions 4 to 8 of each time slot number 0 of the frame. FIG. 3 is a block diagram of the signaling processing unit 2. In the figure, 6 is a signaling bit extraction circuit for extracting signaling information of a plurality of channels multiplexed on the terminal line from a terminal line, and 7 is a circuit for holding and storing signaling bits of a plurality of channels received from the signaling bit extraction circuit 6. The signaling bit display register 8 is an interrupt timing generation circuit that generates an interrupt timing when all the signaling bits of the channels multiplexed on the terminal line are completely stored in the signaling bit display register 7. 9 is a CPU for assembling and disassembling signaling cells, 10 is a CP
U9 is a work RAM used for assembling and disassembling signaling cells, 11 is a transmission circuit used for sending the signaling cells to the ATM network side line via the multiplexing unit 3, 1
Reference numeral 2 is a receiving circuit for receiving a signaling cell from the ATM network side line via the separating unit 4. Reference numeral 13 is an interrupt control circuit that arbitrates interrupt signals from the interrupt timing generation circuit 8 and the receiving circuit 12 and notifies the CPU 9 of the interrupt signal.
A signaling bit setting register for setting signaling bits of a plurality of channels included in a cell received from the TM network side line, 15 is a signaling bit setting register 1
4 is a signaling bit transmission circuit for transmitting the signaling bit set to 4 to the terminal line.

FIG. 4 is a diagram showing the format of a signaling cell used in this embodiment. In the figure, 16 is a signaling cell, and 161 in the cell is an ATM.
A layer header, 162 is a type field indicating the identification of a voice cell and a signaling cell, 163 is a signal value field for storing signaling bits of an individual line signaling system, 16
4 is a time stamp field for storing time information, 1
65 is a type field 162 and a signal value field 16
3 is an error detection code field that stores an error detection code of a signaling information field including a time stamp field 164. FIG. 5 is a diagram showing a signaling cell transfer sequence in this embodiment.

Since the basic hardware configuration of the present apparatus is a general-purpose format, there is almost no change, but the operation flow especially in the signaling processing unit differs as follows. Next, the operation will be described. The voice cell assembly processing unit 1 assembles the voice data from the terminal line into a voice cell, the signaling processing unit 2 extracts the signaling from the terminal line and assembles into a signaling cell, and the multiplexing unit 3 multiplexes each cell to ATM. It is sent to the network side line. Also, the voice cell and the signaling cell received from the ATM network side line are separated by the separation unit 4
, The voice cells are transferred to the voice cell disassembling processing unit 5, and the signaling cells are transferred to the signaling processing unit 2. Each processing unit disassembles the cells and sends them to the terminal line. The above is the general operation of the ATM multiplexer in normal operation.

Next, the operation of the signaling processing unit 2 will be described. The signaling bit receiving circuit 6 of the signaling processing unit 2 extracts the signaling bits A1 to A30 of the individual line signaling system transferred from the terminal line by using the time slot 0 of the time division multiplexed frame as shown in FIG. , To the signaling bit display register 7. The signaling bit display register 7 notifies the interrupt timing generation circuit 8 of the completion of storage when all the signaling bits A1 to A30 have been stored. The interrupt timing generation circuit 8 is C via the interrupt control circuit 13.
Notify the PU 9 of the interrupt. The CPU 9 sends the signaling bits A1 to A1 from the signaling bit display register 7.
A30 is read, the state transition of the signaling bit is monitored for each channel, and at the time when the change point is detected, the signaling cell 16 for each channel on the work RAM 10 is detected.
Are assembled and set in the transmission circuit 11. When the signaling cell 16 is set, the transmission circuit 11 sends the cell 16 to the multiplexing unit 3. As a result, the signaling cell 16 is sent to the ATM network side line. As described above, in this embodiment, as shown in FIG. 5A on the terminal line side, cells are immediately generated and transmitted in accordance with the change in the state of the signal line.

On the other hand, the receiving circuit 12 which has received the signaling cell 16 receives the CPU 9 via the interrupt control circuit 13.
Notify the reception interrupt to. The CPU 9 reads the signaling cell 16 from the receiving circuit 12, and the work RAM 10
The signaling cell 16 is disassembled for each channel above, and the signaling bit contained therein is extracted and set in the field of the corresponding channel in the field provided for the channel of the signaling bit setting register 14.
The signaling bit transmission circuit 15 reads the set values of the signaling bits A1 to A30 from the signaling bit setting register 14 at regular intervals, and sets the signaling bits in the time slot 0 of the terminal line according to the format shown in FIG. I will do it.

Next, a method of transferring the signaling cell 16 will be described with reference to FIGS. FIG. 5 (a)
On the transmitting side, a sequence of changes in the signaling value of the individual line signaling received from the terminal line is shown, and FIG. 5B shows a transmission sequence of the signaling cell 16 based on the changes. FIG. 5 (c) shows the sequence of the signaling cell 16 received at the receiving side, and FIG. 5 (d) shows a series of operations for sending the signaling of the individual line signaling method to the terminal line. On the transmitting side, in the example shown in the figure, the change point A of the first signaling is equal to or longer than a certain time (for example, 2 seconds) from the change point of the previous signaling (not shown), and therefore, when the change point A is detected. Timestamp field 1 of signaling cell 16-1 to be transmitted (hereinafter referred to as 16-1, 16-2, etc. in the order of transmission of cell 16, and similar description is made for other cells)
64 is set to 0, the changed value 1 is set to the signal value field 163, a value indicating a signaling cell is set to the type, an error detection code is calculated and set in the error detection code field 165 for transmission. Since the change point of the subsequent signaling is equal to or less than the fixed time from the previous change point, the time stamp field 164 of the signaling cells 16-2 to 16-4 indicates the elapsed time from the change point of the previous signaling, 67, 33, 67 are set respectively, and the signaling values after the change, 0, 1, 0 respectively.
Is set in the signal value field 163 and transmitted. Also,
In the time stamp field 164 of the signaling cell 16-5, 0 is set because the elapsed time T from the change point D of the previous signaling is equal to or more than a certain value.
The time stamp field 164 of 6 is set to 67, and the signal value field 163 is set to 1 and 0, respectively.

On the receiving side, the following operation is correspondingly performed.
That is, when the value of the time stamp field 164 of the signaling cell 16 is 0, the value of the signal value field 163 of the corresponding signaling cell 16 is set in the signaling bit setting register 14 after the fluctuation absorption fixed delay has elapsed from the cell reception. When the value is any other value, the value of the signal value field 163 of the previous signaling cell 16 is set in the signaling bit setting register 14, and after the time of the time stamp field 164 of the corresponding signaling cell 16 has elapsed, the signal value field The value of 163 is set in the signaling bit setting register 14. That is, the value of the time stamp field 164 of the signaling cells 16-1 and 16-5 is 0, and the value 1 of the signal value field 163 included in the cell is changed to 1 after the fluctuation absorption fixed delay elapses from the time of receiving the cell. Set in the signaling bit setting register 14. Regarding the signaling cells 16-2 to 16-4, after the value of the signal value field 163 of the previous signaling cell 16 is set in the signaling bit setting register 14, the value of the time stamp field 164 is 67, 33 and 67 mS, respectively. After the lapse of time, the values 0, 1, 0 of the respective signal value fields 163 are set in the signaling bit setting register 14. Regarding the value of the signal value field 163 of the signaling cell 16-6, after setting the value of the signal value field 163 of the signaling cell 16-5 in the signaling bit setting register 14, the value of the time stamp field 164 of the signaling cell 16-6. , 67 mS has elapsed, and is set in the register 14. The transmission time of the cell to the line is 2.7μ when the line speed is 155 Mbit / s.
S, even if all terminals simultaneously transmit dial pulses, the time required for cell transmission is 30 × 2.7 = 8.
1 μS is enough, the minimum interval of dial pulse is 33 mS
Since it is extremely smaller than that of cell No. Further, in the present embodiment, when the signal changes, it is notified to the receiving side, so that the delay due to the cell formation is greatly shortened compared to the conventional example.

Example 2. Although transmission of cells is slightly delayed, an example will be described in which the features of the invention are utilized and the number of cells is further reduced. The cell transfer method according to the second embodiment of the present invention will be described below. The device configuration and the like of this embodiment are the same as those of the first embodiment. The difference is that a plurality of change point information is stored in one cell. FIG. 6 is a diagram showing the format of the signaling cell 16 used in this embodiment, and 166 is a length field showing the effective length of the signaling information field of the signaling cell 16. FIG. 7 is a diagram showing a signaling cell transfer sequence in the present embodiment, and shows an example of storing up to two sets of signaling change point information in one signaling cell 16 in the figure.

Next, the operation will be described. The operation of the signaling processing unit 2 is the same as that of the first embodiment, except for the processing at the time of assembling and receiving the signaling cell 16. Further, the signaling cell 16 has a type field 162, a signal value field 163, a time stamp field 164 and an error detection code field 16 as shown in FIG.
Multiple sets of 5 are stored as one set. In FIG.
Time A when the value of signaling on the transmitting side changes from 1 to 0
Then, the signaling cell 16-1 is assembled. In this embodiment, one signaling cell 16 is used up to two change point information.
Since it is stored in
00mS) Wait. However, since the next change point does not occur even after 100 mS has passed, the signaling cell 16-1 is transmitted at that time. At this time, the signaling cell 16-1 includes a type field 162-1, a signal value field 163-1, and a time stamp field 164-.
1 and the error detection code field 165-1 are set, and the length field 166 is set to a length of 4 bytes for one set of change point information. The time stamp field 164-1 is set to a value 0 indicating that a certain time or more has elapsed from the previous change point.

Further, regarding the change point B and the change point C, since the signaling changes within a fixed time (100 mS), the change point information of the change point B and the change point C is respectively set in the signaling cell 16-2. , Type field 162-
1, signal value field 163-1, time stamp field 164-1 and error detection code field 16
5-1, the type field 162-2, the signal value field 163-2, the time stamp field 164-2, and the error detection code field 165-2, and the length field 166 has a length 8 for two sets of change point information. Set bytes and send. Thereafter, also for the change points D to G, two sets of change point information are similarly stored in the signaling cells 16-3 and 4 and transmitted.

On the receiving side, the length field 166 of the signaling cell 16 is read to determine the number of sets of change point information stored. In the signaling cell 16-1, the change point information is one set, and the time stamp field 164-
Since the value of 1 is 0, the value of the signal value field 163-1 is set in the signaling bit setting register 14 after the fluctuation absorption fixed delay after cell reception. In signaling cells 16-2 and 4, there are two sets of change point information,
First change point information time stamp field 164-
Since the value of 1 is 0, the value of the signal value field 163-1 is set in the signaling bit setting register 14 after the fluctuation absorption fixed delay after cell reception, and then 2
Timestamp field 164- of the th change point information
The value of the signal value field 163-2 is set in the signaling bit setting register 14 after the elapse of 67 mS which is the value shown in 2. In the signaling cell 16-3, since there are two sets of change point information and the value of the time stamp field 164-1 of the first change point information is 33, the value corresponding to the previous change point C is set to the signaling bit setting register. 33 ms after setting to 14, the signal value field 1
The value of 63-1 is set in the signaling bit setting register 14, and after the value 67 mS of the time stamp field 164-2 of the second change point information, the value of the signal value field 163-2 is set in the signaling bit setting register 14. Set to. In this way, compared to the first embodiment, the cell transmission timing is delayed by 100 ms, but the number of cells to be transmitted is halved. Even if it is delayed by 100 ms, the time will be significantly faster than the conventional one.

Example 3. An example of cell generation including a change in signal line state due to on-hook and off-hook will be described. The cell transfer method according to the third embodiment of the present invention will be described below. In the present embodiment, the device configuration and so on up to the seventh embodiment are the same as in the first embodiment. FIG. 8 is a diagram showing the format of the signaling cell 16 cell a used for transferring a signal value among the signaling cells 16 used in this embodiment. FIG. 9 is a diagram showing the format of the signaling cell 16b used for transferring the dial pulse among the signaling cells 16 used in this embodiment, and 167 is a pulse count field for displaying the number of detected dial pulses. In this embodiment, it is assumed that the dial pulse speed is predetermined by the system. FIG. 10 is a diagram showing a cell transfer sequence in this embodiment. FIG. 10 shows an example in which the dial pulse speed is 10 pps.

Next, the operation will be described. The operation of the signaling processing unit 2 is the same as that of the first embodiment, except for the processing at the time of assembling and receiving the signaling cell 16. Further, as shown in FIGS. 8 and 9, the signaling cell 16 is made up of two types: a cell 16a used for transferring a signal value and a cell 16b used for transferring a dial pulse.
A code indicating each cell type is set in 2. FIG.
At 0, the change point A of the signaling on the transmitting side indicates the transition to the off-hook (starting state), the change points BG indicate the dial pulse, and the change point H indicates the transition to the on-hook (disconnection state). When the change point A is detected, the CPU 9 of the signaling processing unit 2 sets the signal value field 163 of the signaling cell 16a-1 to the changed value 0 and sets the type field 162 to a code indicating the signal value cell and transmits the signal. Similarly, at the time when the change point H is detected, the value 1 after the change is set in the signal value field 163 of the signaling cell 16a-2.
Is set and a code indicating a signal value cell is set in the type field 162 and transmitted. Further, when the change point C is detected,
1 is set in the pulse count field 167 of the signaling cell 16b-1, and a code indicating a dial pulse cell is set in the type field 162 and transmitted. Similarly, at the time when the change point E is detected and the time when the change point G is detected, the signaling cells 16b-2 and 16b-3, respectively.
Send

On the other hand, on the receiving side, the signaling cell 16
Immediately after receiving a-1 and 16a-2, the value of the signal value field 163 is set to the signaling bit setting register 14
The value of signaling is sent to the terminal line by setting to. In addition, the signaling cell 16b-, which is the first dial pulse cell after the off-hook (starting state) detection,
When 1 is received, the value 1 is set after the fluctuation absorption fixed delay elapses from the time when the cell is received, and the value 0 is set after 67 mS.
Are set in the signaling bit setting register 14 to send dial pulses to the terminal line. Since the value of the pulse count field 167 of the signaling cell 16b-1 is 1, the setting operation of the value 1 and the subsequent value 0, that is, the dial pulse reproduction operation is 1.
Do only once. When the signaling cell 16b-2 is received, 33 ms after the value 0 is set in the signaling bit setting register 14 in order to reproduce the dial pulse corresponding to the above-mentioned signaling cell 16b-1,
The value 1 and the value 0 are set in the signaling bit setting register 14 67 mS after setting the value 1. That is, since the dial pulse of 10 pps is determined as the system, even if the number of pulses is 1, the next pulse can be reproduced again in the next cell after 100 ms.

By this operation, the section of value 1 is 67 mS,
After the value 0 section continues for 33 mS, the value 1 section becomes 6 again.
7 mS, and dial pulses with a dial pulse speed of 10 pps are transmitted to signaling cells 16b-1 and 16b-2.
Play in response to the reception of. Furthermore, at the time of receiving the signaling cell 16b-3, since the elapsed time T after transmitting the last change point of the dial pulse to the terminal line is larger than a certain value, fluctuations are caused to the cells after the signaling cell 16b-3. In order to absorb, signaling cell 16b-
The value 1 is set in the signaling bit setting register 14 after the fluctuation absorption fixed delay has elapsed from 3 reception, and the value 0 is set in the signaling bit setting register 14 after 67 mS. The signaling cell 16b-
Since the value of the pulse count field 167 of 2 and 16b-3 is 1, the dial pulse reproduction operation is performed only once. By the series of operations on the receiving side, it is possible to correctly reproduce the dial pulse corresponding to the change points B to G on the transmitting side.

Example 4. Hereinafter, a cell transfer method according to the fourth embodiment of the present invention will be described. This guarantees the interdigit spacing of dial pulses. FIG. 11 is a diagram showing a cell transfer sequence in this embodiment. The formats of the signaling cells 16a and 16b are the same as those in the third embodiment.

Next, the operation will be described. The operation at the time of assembling and receiving the signaling cell 16 is the same as that of the third embodiment. In addition, as shown in FIG. 11, when the next change point is not detected until a certain time T1 has elapsed from the change point E, Signaling cell 16c in which the value of pulse count field 167 of signaling cell 16b is set to 0
-1 is transmitted. On the receiving side, the type field 162 and the pulse count field 16 of the signaling cell 16
Since the value of 7 is 0, the signaling cell 16c-
Recognize that it is 1. This signaling cell 16c
The reproduction of the dial pulse corresponding to the signaling cell 16b-3 arriving next to -1, that is, the timing of setting the signaling value 1 corresponding to the change point F on the transmission side in the signaling bit setting register 14 is set to the change point. The value of the fluctuation absorption fixed delay for the signaling cell 16b-3 is set so that 33 mS has elapsed from the setting of the signaling value 0 corresponding to E to the register 14, that is, after the time T2 has elapsed from the end of the dial pulse waveform of 10 ppS. adjust. In this way, the digit fluctuations of the dial pulse do not become erroneous due to fluctuations in the network, so that errors will not occur.

Embodiment 5 FIG. An example in which information is correctly transmitted even if the dial pulse speed varies depending on the circuit will be described. The cell transfer method according to the fifth embodiment of the present invention will be described below. FIG. 12 shows a signaling cell 16d used in this embodiment.
168 is a diagram showing the format of a pulse speed field for displaying the speed of dial pulses. FIG.
3 is a diagram showing a cell transfer sequence when the dial pulse rate is 10 pps in this embodiment. FIG. 14 is a diagram showing a cell transfer sequence when the dial pulse rate is 20 pps in this embodiment.

Next, the operation will be described. Signaling cells 16a-1 and 16a-2 upon detection of change points A and H
The transmission operation and the operation after reception are the same as in the third embodiment. As shown in FIG. 13, on the transmission side, at the time of detecting the change point C, the elapsed time from the change point B to the change point C (that is, the section in which the signaling value is 1) is measured, and the value is about 67 mS. In this case (actually in the range of 60 to 73 mS), the dial pulse speed is determined to be 10 pps, a code indicating 10 pps in the pulse speed field 168 of the signaling cell 16d, 1 in the pulse count field 167, and 1 in the type field. The code indicating the dial pulse cell is set, the error detection code field 165 is calculated and set, and the signaling cell 16d-1 is transmitted. Similarly, at the time of detecting the change point E and the change point G, the signaling cell 16d-
2, 16d-3 is transmitted.

On the receiving side, the signaling cell 16d-1
, The value is set to the signaling bit setting register 14 after the fluctuation absorption fixed delay elapses from the cell reception time, since the cell is the first dial pulse cell after the off-hook (starting state) detection. Since the value of the pulse rate field 168 of the signaling cell 16d-1 indicates 10 pps, 67 is set after the value 1 is set.
After the elapse of mS, the value 0 is set to the signaling bit setting register 1
Set to 4. Next, when the signaling cell 16d-2 is received, the value 0 is set in the signaling bit setting register 14 and, after 33 mS has elapsed, the value 1 is set, and the value 0 is set 67 mS after setting the signaling bit, respectively. Set in register 14. By this operation,
After the value 1 section continues for 67 mS and the value 0 section for 33 mS, the value 1 section becomes 67 mS again, and the dial pulse with a dial pulse speed of 10 pp (change point B on the transmission side,
Signaling changes corresponding to C, D, and E) are sent to the terminal line. When the signaling cell 16d-3 is received,
Since the elapsed time T after the last change point of the dial pulse is set in the signaling bit setting register 14 is larger than a certain value, the fluctuation is absorbed in the cells after the signaling cell 16d-3, so that the signaling cell 1
6d-3 After the fluctuation absorption fixed delay elapses from the time of reception, the value of the signaling corresponding to the value 10 pps of the pulse rate field 168, that is, the value 1, and the value 0 after 67 mS have passed, the signaling bit setting register 14 respectively. Set to. Since the pulse count field 167 of the signaling cells 16d-1 to 3 is set to 1 in this example, the dial pulse reproduction operation is performed only once.

In the above, the dial pulse speed is 10 pps.
In the case of 20 pps, the change point B is detected at the change points C, E, and G as shown in FIG.
To change point C, change point D to change point E, and change point F
To the change point G from about 32 ms (30 to 3
Since it will be 7 mS range), measure the time of that section,
Pulse rate field 168 of signaling cell 16d
Is set to a code indicating 20 pps, and the signaling cells 16d-1 to 3 are transmitted respectively. On the receiving side, a change in the value of the signaling corresponding to the value 20 pps in the pulse rate field 168 is set in the signaling bit setting register 14 so that the terminal line is set to 20 pps.
The dial pulse of is transmitted. As described above, the dial pulse speed can be estimated from the dial pulse width of the connected terminal line, and this can also be put in the cell to reproduce the necessary dial pulse train.

Example 6. Hereinafter, an example in which the number of cells to be transmitted according to the present invention is further reduced will be described. A cell transfer method according to the sixth embodiment will be described. FIG. 15 is a diagram showing a cell transfer sequence when the dial pulse rate is 10 pps in this embodiment. In the present embodiment, the timing of signaling cell generation is performed, for example, after detecting two pulse trains or after a set time has elapsed. The format of the signaling cell 16 used in this embodiment is the same as that of the fifth embodiment, except that the value of the pulse count field 167 of the signaling cell 16d used for transfer of the dial pulse may be set to 2. In the figure, 16e is used to distinguish from the signaling cell 16d. Next, the operation will be described. The transmission operation of the signaling cells 16a-1 and 16a-2 at the time of detecting the change points A and H and the operation after the reception are the same as those in the third embodiment. In FIG. 15, on the transmitting side, when the change point C of the signaling is detected, it is identified that the time interval between the change point B and the change point C is around 67 mS, and it is determined that the dial pulse speed is 10 pps.
When the change point E is detected, the change points B, C, and
Since D has occurred, it recognizes that two dial pulses have been received. Therefore, signaling cell 1
The value of the pulse count field 167 of 6e-1 is set to 2, and the value of the pulse speed field 168 is set to 10 pps.
Set a code that indicates and send. At the time of detecting the change point G, it is recognized that one dial pulse is received, but the transmission of the signaling cell 16e is waited until two dial pulses are received. However, since the next change point is not detected even after a lapse of T3 time from the change point G, the value of the pulse count field 167 is set to 1 and transmitted to the signaling cell 16e-2 at that time.

On the receiving side, the signaling cell 16e-1
, The value is set to the signaling bit setting register 14 after the fluctuation absorption fixed delay elapses from the cell reception time, since the cell is the first dial pulse cell after the off-hook (starting state) detection. The value of the pulse rate field 168 of the signaling cell 16e-1 is 10 pps, and the value of the pulse count field 167 is 2
Therefore, the value 0 is set after 67 mS has elapsed after setting the value 1, and the value 1 is further set after 33 mS.
After mS, the value 0 is set in the signaling bit setting register 14, respectively. By this operation, the interval of value 1 is 67
After the section of mS, value 0 continues for 33mS, the section of value 1 becomes 67mS again, and dial pulse with a dial pulse rate of 10pps (signaling change corresponding to change points B, C, D, E on the transmission side) is sent to the terminal. Send to the line. Next, when the signaling cell 16e-2 is received, the elapsed time T after the last change point of the dial pulse is set in the signaling bit setting register 14 is a constant value, for example, 20.
Since it is larger than 0 ms, fluctuations are absorbed in the cell of the signaling cell 16e-2. Therefore, after the fluctuation absorption fixed delay elapses from the reception time of the signaling cell 16e-2, the value of the signaling corresponding to the value 10 pps of the pulse rate field 168 is changed. The value change is set in the signaling bit setting register 14. However, signaling cell 1
Since the pulse count field 167 of 6e-2 is set to 1, the dial pulse is transmitted to the terminal line only once.

Example 7. Hereinafter, a cell transfer method according to the seventh embodiment of the present invention will be described. FIG. 16 is a diagram showing a format of the signaling cell 16 used in this embodiment,
A channel number field 169 identifies a channel number of signaling multiplexed on the terminal line.
FIG. 17 is a diagram showing a signaling cell transfer sequence in this embodiment.

Next, the operation will be described. In FIG. 17, it is assumed that channels 1 to 3 are multiplexed on the same virtual path in the ATM network side line. Channel 1 signaling change point G1 to T4 time (eg 10
If the next change point is not detected even after the elapse of seconds, the signaling cell 16f-1 is assembled at that time in order to periodically notify the receiving side that the cell transfer of signaling is normally performed. Send. At that time, the channel number 1 is set in the channel number field 169-1, the signaling value 0 at that time is set in the signal value field 163-1, and the channel number field 169-1, the signal value field 163-1, and the type are set. An error detection code for 2 bytes including the field 162-1 is created, set in the error detection code field 165-1, and 3 bytes (data length for one channel) is set in the length field 166. Also, the change point G of the signaling of channel 2
If the next change point is not detected even after the lapse of T4 time from 2, the signaling cell 16f-2 is assembled and transmitted at that time. At that time, the channel number field 169-1,
After setting the channel numbers 1 and 2 to 169-2, and the signal value 0 of the channel numbers 1 and 2 at that time to the signal value fields 163-1 and 163-2, and setting the other fields. , 6 bytes (data length for two channels) are set in the length field 166.

Furthermore, if the next change point is not detected even after a lapse of T4 time from the change point G3 of the signaling of the channel 3, the signaling cell 16f-3 is assembled and transmitted at that time. At this time, the fields corresponding to each of the channel numbers 1 to 3 are set and transmitted in the manner described above. After that, the signaling cell 1 in which the value of the signaling of the channel numbers 1 to 3 is set for each T4 cycle
6f-3 is assembled and transmitted. Note that the signaling cell 1
The virtual path identifier of the ATM layer header 161 of 6f is a virtual path number in which channels 1 to 3 are multiplexed, and the virtual channel identifier is channel 1
Set one of the virtual channel numbers assigned to 3 to 3 respectively.

Although not shown in the figure, in the state where the signaling cell 16f-3 is transmitted in the T4 cycle, for example, when the signaling value of channel 1 changes from 0 to 1, channel 1 becomes The signaling cell 16f-1 is transmitted at the time of detecting the change, and for the channels 2 and 3, the signaling cell 16f-2 is transmitted at the timing at which the signaling cell 16f-3 should be transmitted next. On the other hand, on the receiving side of the signaling cell 16f, the length field 16 of the signaling cell 16f is checked,
Figure out how many channels of information it contains. In FIG. 17, the signaling cell 16f-1 is 1
Channels (channel 1), 2 channels for 16f-2 (channel 1, channel 2), 16f-3 for 3 channels (channel 1, channel 2, channel 3).
When the signaling cell 16f-1 is received, the signaling cell 16f-1 is added to the terminal line for channel 1.
The value of the signal value field 163-1 of is transmitted. Also,
When the signaling cell 16f-2 is received, the values of the signal value fields 163-1 and 163-2 of the signaling cell 16f-1 are transmitted to the terminal lines for the channel 1 and the channel 2, respectively. Similarly, when the signaling cell 16f-3 is received, the signal value field 1 of the signaling cell 16f-1 is connected to the terminal line for channel 1, channel 2 and channel 3.
The values of 63-1, 163-2 and 163-3 are transmitted respectively. If these cells indicating the normal state are not received, it is determined that the cell is abnormal, and a signaling bit indicating that communication is being performed is transmitted to the terminal line for the corresponding channel. The terminal thereby cancels the new call.

Example 8. In the following embodiments, an example will be described in which a terminal is notified of the occurrence of a failure on the ATM network and the generation of extra cells is suppressed. The cell transfer method according to the eighth embodiment of the present invention will be described below. FIG. 18 illustrates an OAM (Operation And Mainten) for transferring alarm information.
FIG. 17 is a diagram showing a format of an ANCE) cell, and 17 is an OAM cell. In the cell, 171 is an ATM layer header including virtual path and bar channel channel identifiers, 172 is an OAM type field indicating the type of the OAM cell 17, and 173 is a function of the type indicated by the OAM type field 172. OAM function type field indicating whether the cell executes
A function type specific field, 175 is a reserve field, and 176 is a CRC field for setting an error detection code for the payload portion of a cell. The overall structure of the ATM multiplexer is the same as that of the first embodiment. Further, FIG. 19 is a diagram showing a block configuration of the signaling processing unit 2 in the present invention. In the figure, reference numeral 22 is a voice cell assembly processing unit communication circuit that sends and receives control information to and from the voice cell assembly processing unit 1, and 23 is a voice cell disassembly process that sends and receives information to and from the voice cell disassembly processing unit 5. It is a partial communication circuit. FIG.
Of the OAM cell 17 is a VP-AIS (Alarm
It is the figure which showed the transmission sequence of the Indication Signal) cell 17a and the VP-FERF cell 17b. FIG. 21 is a diagram showing a sequence when the VP-AIS state is detected in the present invention. FIG. 22 is a diagram showing a sequence activated by detecting the VP-AIS state of the communication partner. FIG. 23 shows the VP-AIS in the present invention.
It is a figure which shows the sequence at the time of state release detection. FIG. 24 is a diagram showing a sequence activated by detection of VP-AIS state cancellation of the communication partner. The other ATM multiplexers have the same configurations as in the first embodiment.

Next, the operation will be described. When a line failure is detected in the node device in the ATM network, as shown in FIG. 20, the OAM cell 17 is applied to the virtual path multiplexed on the downstream side of the failed line.
(A code indicating OAM type field 172 = alarm transfer, OAM function type field 173 = AIS is set. OAM cell, hereafter referred to as VP-AIS cell 17a) is used while the line failure continues. , Every fixed period (for example, one second period). Further, when the recovery of the line failure is detected, the node device in the ATM network stops the transmission of the VP-AIS cell 17a. On the other hand, VP
-The terminal which receives the AIS cell 17a from the ATM network is
AM cell 17 (OAM type field 172 = alarm transfer, OAM function type field 173 = FERF (Fa
OAM cell in which a code indicating r End Receive Failure is set (this cell will be referred to as V
(Called P-FERF cell 17b). In the ATM multiplexer which has received the VP-AIS cell 17a from the ATM network, when the demultiplexing unit 4 receives the VP-AIS cell 17a via the receiving circuit 12 by the demultiplexing unit 4, as shown in FIG. The relevant virtual path is VP-
It is determined that the transition to the AIS state is made, and the VP-FERF cell 1
7b is transmitted. Also, the CPU of the signaling processing unit 2
Reference numeral 9 denotes the VP-AIS of the corresponding virtual path to the voice cell disassembly processing unit 5 through the voice cell disassembly processing communication circuit 23.
Notify that a condition has occurred.

Furthermore, the channels multiplexed in the virtual path that received the VP-AIS cell 17a (see FIG. 21).
Then, for channels 1 to 3), the value of the signaling being sent toward the terminal at the time of detecting the VP-AIS state is stored in the work RAM 10, and the value 0 of the signaling is set in the signaling bit setting register 14. In this case, the signaling value 0 is a value indicating that a call is in progress. By sending this value to the terminal line as the system, the dial pulse is sent from the terminal line using the channel receiving the signaling value 0. It is impossible to do.
Also, for each of the channels 1 to 3, for example, the signal value field 16 of the signaling cell 16b shown in FIG.
Signaling cells 16a-11 to 1 in which the value 0 is set to 3
2, 16a-21 to 22 and 16a-31 to 32 are transmitted at regular intervals (T4). On the other hand, as shown in FIG. 22, the communication partner (ATM multiplexer # 1) is VP-AIS.
When the state is detected, first, the VP-FERF cell 17
a is subsequently received, and the signaling cells 16 (signal value field 163 = 0) of channels 1 to 3 multiplexed in the virtual path in which the VP-AIS state is detected. After that, the VP-FERF cell 17a has a fixed period (1
Every second), signaling cells 16 of channels 1 to 3
(Signal value field 163 = 0) is received every fixed period (T4). By receiving the VP-FERF cell 17a,
The corresponding virtual channel is transited to the VP-FERF state, and the channels 1 to 3 multiplexed in the virtual path are stored in the work RAM 10 on the VP-FER.
The value of signaling being sent toward the terminal when the F state is detected is saved, and the value of signaling of 0 is set in the signaling bit setting register 14 to send the value of signaling of 0 to the terminal line. When the signaling cell 16 of the channels 1 to 3 (signal value field 163 = 0) is received, if the channel is already in the VP-FERF state, the signaling cell 16 is discarded. The value = 0 in the signal value field 163 of the signaling cell 16 is transmitted to the terminal line.

On the other hand, from the ATM network, the VP-AIS cell 1
When it is detected that 7a is not received for 3 seconds or more,
Alternatively, although not shown, when the signaling cell 16 is received from the virtual path in the VP-AIS state, or the voice cell decomposition processing unit 5 notifies that the voice cell is received from the virtual path in the VP-AIS state. In either case, it is determined that the VP-AIS state is released. When it is determined that the VP-AIS state is released, FIG.
3, the value of the signaling stored in the work RAM 10 before entering the VP-AIS state for the channel multiplexed in the relevant virtual path is
Set in the signaling bit setting register 14. Further, for each of channels 1 to 3, for example, the signal value field 163 of the signaling cell 16b illustrated in FIG. 8 is used.
, The signaling cells 16a-1, 16a-2, 16a- in which the value of the signaling received from the terminal line is set
3 is sent out. Further, the CPU of the signaling processing unit 2
Reference numeral 9 denotes the VP-AIS of the corresponding virtual path to the voice cell disassembly processing unit 5 through the voice cell disassembly processing communication circuit 23.
Notify the status release. As shown in FIG. 24, when the communication partner (ATM multiplexer # 1) detects the release of the VP-AIS state, the ATM multiplexer # 2 determines the VP-AIS state.
Since it does not receive the FERF cell 17b, VP for 3 seconds
-When the non-reception of the FERF cell 17b is detected, it is determined that the VP-FERF state of the corresponding virtual path is released, and the VP of the corresponding virtual path is notified to the voice cell decomposition processing unit 5 via the voice cell decomposition processing unit communication circuit 23. -Notify release of FERF state. After that, channels 1 to 3 multiplexed in the virtual path that has been released from the VP-FERF state
Of the signaling cell 16 of FIG. 1 and sends the value of the signal value field 163 contained in the cell to the terminal line. In this way, the terminal can automatically stop and restart the communication in response to the occurrence and recovery of the ATM network failure.

Embodiment 9 FIG. In the ATM multiplexer, the system alarm is not VP-AIS cell but VP-FER
Sometimes I know it with F cell. In response to this, the cell transfer method according to the ninth embodiment of the present invention will be described below. Figure 25
FIG. 6 is a diagram showing a case where the VP-FERF cell 17b is generated and transmitted in the ATM network. FIG. 26 is a diagram showing a sequence when the VP-FERF state is detected and when the VP-FERF state release is detected in the present invention. FIG. 27 is a diagram showing a sequence activated by the VP-FERF state detection and the VP-FERF state release detection of the communication partner. Next, the operation will be described. The structure of the ATM multiplexer is the same as that of the first embodiment. The case where the VP-FERF cell 17b is transmitted is, as shown in FIG.
A node device in the ATM network detects a line failure, sends out a VP-AIS cell 17a to the downstream side of the line where the failure is detected, and the terminal receives the VP-AIS cell 17a and receives the ATM.
When transmitting the VP-FERF cell 17b to the network, and FIG.
As shown in FIG. 5, the node device in the ATM network detects the line failure, and the VP-FERF cell 17b is provided upstream of the failed line.
There are two cases of sending a. From ATM network, VP-F
In the ATM multiplexer that has received the ERF cell 17b, the demultiplexing unit 4 distributes it to the signaling processing unit 2. The signaling processing unit 2 receives the VP-FERF 1 via the receiving circuit 12.
When the 7b cell is received, it is determined that the virtual path receiving the VP-FERF cell 17b has transitioned to the VP-FERF state. When transitioning to the VP-FERF state, FIG.
As shown in FIG. 3, the CPU 9 of the signaling processing unit 2 transmits the voice cell of the channel multiplexed on the corresponding virtual path to the voice cell assembly processing unit 2 via the voice cell assembly processing unit communication circuit 22. A work RAM is used for the channels (channels 1 to 3 in FIG. 26) that are instructed to stop and that are multiplexed in the relevant virtual path.
10 stores the value of signaling being sent to the terminal at the time of detecting the VP-FERF state, and the value of signaling 0
Is set in the signaling bit setting register 14. Moreover, the transmission of the signaling cell 16 is stopped for each of the channels 1 to 3.

On the other hand, when it is detected that the VP-FERF cell 17b is not received for 3 seconds or more, the VP-FER is detected.
It is determined that the F state is released, and the voice cell assembly processing unit 2
A work RAM is instructed for restarting the transmission of voice cells of the channel multiplexed in the corresponding virtual path, and for the channel multiplexed in the corresponding virtual path.
The value of the signaling, which is stored on the device 10 before entering the VP-FERF state, is set in the signaling bit setting register 14. For each of channels 1 to 3, for example, the signaling cell 16a-1 in which the value of the signaling received from the terminal line is set in the signal value field 163 of the signaling cell 16b shown in FIG.
16a-2 and 16a-3 are transmitted. Also, when the communication partner (ATM multiplexer # 1) transits to the VP-FERF state, the ATM multiplexer 2 has the channels 1 to 3 multiplexed in the virtual path transiting to the VP-FERF state. Since the signaling cell 16 is not sent, the signaling value = 0 is sent to the terminal line for the channel in which the non-reception of the signaling cell 16 is detected for a certain period of time or longer. On the other hand, the ATM multiplexer # 1 is VP-
When the release of the FERF state is detected, the signaling cells 16 of channels 1 to 3 multiplexed in the virtual path are sent to the ATM multiplexer # 2. When 16 is received, the value of the signal value field 163 of the signaling cell 16 is sent to the terminal line.

Example 10. In the above embodiment, the signaling cell of the individual signal line system has been described. From this embodiment onward, common line signaling will be described.
FIG. 28 is a diagram showing a common line system signaling information transfer format system in a terminal line. In the figure, reference numeral 24 is an LAPD frame obtained by collecting bit strings of signal channels of a terminal line in time series. LAP
The D frame 24 has an address field 241, a control field 242, an information field 243, and an FCS.
There are subfields of field 244. Further, the information field 243 stores the layer 3 message 25 in which the end-to-end signaling information is mounted. FIG. 29 is a block diagram of the signaling processing unit 2 used in the present invention. In the figure, reference numeral 18 denotes a signaling slot designating circuit for the CPU 9 to set a slot for signaling transfer among the time slots on the terminal line,
Reference numeral 19 indicates a signaling slot designation circuit 1 from the terminal line.
Signaling data receiving circuit for extracting and receiving signaling data from the slot designated by 8, 20 is an LAPD frame processing circuit for terminating the protocol by extracting LAPD frame from the signaling data received by the signaling data receiving circuit 19, and 21 is It is a signaling data transmission circuit for writing the LAPD frame from the LAPD frame processing circuit 20 into a designated time slot of the terminal line. FIG. 30 shows the VP-AIS in the present invention.
It is a figure which shows the sequence at the time of a state and VP-AIS state cancellation | release detection. The format of the OAM cell 17 is the same as that shown in the eighth embodiment.

Next, the operation will be described. The CPU 9 sets the time slot used for signaling transfer in advance in the signaling slot designation circuit 18 from the time slots on the terminal line, for example, the 1.5M interface defined in TTC standard JJ20.20-22. Although there may be two or more time slots, since time slot 0 is a signal channel used for signaling transfer in FIG. 28, only time slot 0 is set in this embodiment. From the time slot 0 set in the signaling slot designating circuit 18, the signaling data receiving circuit 19 extracts the signaling data of the common line signaling system in time series and transfers it to the LAPD frame processing circuit 20. LAPD frame processing circuit 20
From the signaling data to the LAPD frame 24
And the LAPD protocol is terminated, and the layer 3 message 25 included in the information field 243 of the LAPD frame 24 and the time slot number at which the message is received are written in the work RAM 10. Further, the frame reception is performed by the CP via the interrupt control circuit 13.
Notify U9 of frame reception. When the CPU 9 receives the frame reception interrupt, it reads the layer 3 message from the work RAM 10, assembles it into cells according to the AAL5 protocol, and sets a value corresponding to the time slot number of the terminal line in the virtual path identifier of the ATM layer header, By writing the cell in the transmission circuit 11, the cell is transmitted to the ATM network side line.

The signaling cell 16 received from the ATM network side line is stored in the receiving circuit 12, and the CPU 9 is notified of the cell reception via the interrupt control circuit 13.
The CPU 9 restores the layer 3 message 25 from the received one or more signaling cells 16 according to the AAL5 protocol, and provides the LAPD frame processing circuit 20 with the layer 3 message 25 and the time slot number corresponding to the virtual path identifier of the cell. Forward. LA
The PD frame processing circuit 20 assembles the LAPD frame 24 based on the layer 3 message 25 and transmits it to the signaling data transmission circuit 21. The signaling data transmission circuit 21 sets L at the designated time slot of the terminal line.
The APD frame 24 is set byte by byte for each frame period of the terminal line.

In FIG. 30, the signaling processing unit 2
When receiving the VP-AIS cell 17a from the ATM side line in the virtual path in the VP-AIS cancellation state, determines that the virtual path has transited to the VP-AIS state, and the voice cell disassembling processing unit 5 Via the cell disassembly processing unit communication circuit 23, the occurrence of the VP-AIS state of the relevant virtual path is notified, and further, VP-FE.
The RF cell 17b is transmitted to the ATM side line and corresponds to the virtual path identifier of the corresponding virtual path.
Search for the number of the time slot that transfers common line signaling on the terminal line. After that, CPU9
Creates an initialization message and sends it to the LAPD frame processing circuit 20 together with the time slot number. The LAPD frame processing circuit 20 assembles the LAPD frame 24 based on the layer 3 message 25, and the signaling data transmitting circuit 21 transmits the LAPD frame 24 in the designated time slot. When the initial setting response message to the transmitted initial setting message is received from the terminal line, the message is discarded. As a result, the call currently in communication is initialized. When the layer 3 message 25 received from the time slot corresponding to the virtual path in the VP-AIS state is a SETUP (call setup) message, the CPU 9 assembles a REL COM (release completion) message, together with the time slot number. It is sent to the frame processing circuit 20. After that, L is connected to the terminal line via the signaling data transmission circuit 21.
The REL COM (release complete) message stored in the APD frame 24 is transmitted. This prevents new call setup. Further, although not shown, DIS
When the C (disconnect) message is received, the CPU 9 assembles the signaling cell 16 and transmits the A signal via the transmission circuit 11.
Send to the TM network side line. When a message other than the above is received, it is discarded and not sent to the ATM network side line.

On the other hand, when it is detected that the VP-AIS cell 17a is not received for 3 seconds or more, or when the signaling cell 16 is received from the virtual path in the VP-AIS state (not shown), or When it is notified from the voice cell disassembly processing unit 5 that the voice cell is received from the virtual path in the VP-AIS state, it is determined that the VP-AIS state is released. VP
-When it is determined that the AIS state is released, the voice cell disassembly processing unit 5
To the VP-AIS state release of the corresponding virtual path via the voice cell disassembly processing communication circuit 23. After that, when all the messages including the SETUP (call setup) message are received from the terminal line, the messages are assembled into cells and sent to the ATM network side line.

Example 11. The same applies to reception of a VP-FERF cell instead of the VP-AIS cell. The cell transfer method according to the eleventh embodiment of the present invention will be described below. FIG. 31 shows the VP-FERF state and VP-FE in this embodiment.
It is a figure which shows the sequence at the time of RF state release detection. The format of the OAM cell 17 is the same as that shown in the eighth embodiment.

Next, the operation will be described. VP-FER
When the VP-FERF cell 17b is received from the ATM network side line in the virtual path in the F cancel state, the signaling processing unit 2 determines that the virtual path is VP-FER.
It is determined that the state has transitioned to the F state. When transitioning to the VP-FERF state, as shown in FIG. 31, the voice cell assembly processing unit 2
, Through the voice cell assembly processing unit communication circuit 22,
Channels multiplexed in the relevant virtual path (Fig. 3
In 1, the instruction to stop the transmission of the voice cells of channels 1 to 3) and search for the number of the time slot for transferring the signaling of the common line signaling on the terminal line, which corresponds to the virtual path identifier of the relevant virtual path. . After that, the CPU 9 creates an initial setting message and sends it to the LAPD frame processing circuit 20 together with the time slot number. The LAPD frame processing circuit 20 assembles the LAPD frame 24 based on the layer 3 message 25, and the signaling data transmitting circuit 21 transmits the LAPD frame 24 in the designated time slot. When the initial setting response message to the transmitted initial setting message is received from the terminal line, the message is discarded. As a result, the call currently in communication is initialized.

When a SETUP (call setup) message is received from the time slot corresponding to the virtual path in the VP-FERF state, it is discarded and the AT
It is not sent to the M network side line. When the message is received, the CPU 9 assembles a REL COM (release completion) message and sends it to the frame processing circuit 20 together with the time slot number. After that, the REL COM (release completion) message stored in the LAPD frame 24 is transmitted to the terminal line via the signaling data transmission circuit 21. This prevents new call setup. Although not shown, when another message is received, it is discarded and is not sent to the ATM network side line.

On the other hand, when it is detected that the VP-FERF cell 17b is not received for 3 seconds or more, the VP-F is detected.
It is determined that the ERF state is released, and the voice cell assembly processing unit 2 is instructed via the voice cell assembly processing unit communication circuit 22 to restart the transmission of the voice cell of the channel multiplexed on the corresponding virtual path. After that, from the terminal line to SETU
When all messages including the P (call setup) message are received, the message is assembled into a cell and the ATM is assembled.
It is sent to the network side line.

[0070]

As described above, according to the present invention, the step of storing the signaling bit in the register, the step of detecting the transition of the state of the signaling bit to generate the signaling cell, and the setting of the state of the signaling bit in the receiving cell. Since the step and the step of setting the detected state when time has elapsed and the step of transferring are provided, it is possible to transfer the change in the state of the signal line on the transmitting side without delay.

Furthermore, since a plurality of state change points are described in the cell and the plurality of state changes are taken out from the receiving side, the effect of reducing the number of cell transmissions is obtained in addition to the effect of the basic configuration.

Furthermore, since the on-hook and off-hook state changes are also detected to generate a cell and the receiving side restores this, it is possible to transfer the state changes on the transmitting side including the on-hook and off-hook without delay. There is.

Furthermore, since the completion of the dial pulse transmission is detected and transferred, in addition to the effect of the basic configuration, the pulse reproduction which guarantees the minimum pause between dial digits by removing the influence of the fluctuation of the ATM network can be performed. effective.

Furthermore, since the dial pulse speed is also transferred, in addition to the effect of the basic configuration, there is an effect that the dial pulse corresponding to the difference in line speed can be correctly reproduced.

Furthermore, since the speeds of a plurality of dial pulses are transferred to one cell, the number of cell transmissions can be reduced in addition to the effect of the basic configuration, and the dial pulse corresponding to the difference in line speed can be correctly reproduced. effective.

Further, since the normal communication is notified by the small number of cells in the active state on a regular basis, the normality and abnormality of the system can be monitored with the small number of cells in addition to the effect of the basic configuration.

Alternatively, VP-AIS or VP-FER
The F state is detected and notified to each terminal channel, and the subsequent call from the terminal is suppressed, and VP-AIS or VP-FERF is suppressed.
When the release of the state is detected, the release is notified to each terminal and the communication is restarted, so that there is an effect of notifying the terminal of a fault on the ATM network and suppressing the generation of unnecessary signal cells during that period.

Alternatively, since the VP-AIS state is detected and the VP-FERF state is notified to other multiplexers, the AT
This is effective in notifying the terminal of a failure on the M network and suppressing the generation of unnecessary signal cells during that time.

Alternatively, the common line signaling method is used to detect the VP-AIS or VP-FERF state and notify the corresponding terminal channel to suppress subsequent calls from the terminal and release the VP-AIS or VP-FERF state. When it detects it, it notifies the corresponding terminal of the cancellation and restarts communication.
This is effective in notifying the terminal of a failure on the M network and suppressing the generation of unnecessary signal cells during that time.

Alternatively, since the VP-AIS state is detected by the common line signaling method and notified to other multiplexers, it is effective to inform the terminal of a fault on the ATM network and suppress the generation of unnecessary signal cells during that period. is there.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an ATM multiplexer that performs a cell transfer method of the present invention.

FIG. 2 is a diagram showing a transfer format of signaling information (signaling bits) of an individual line signaling system.

FIG. 3 is a block diagram of a signaling processing unit 2 of the device shown in FIG.

FIG. 4 is a diagram showing a format of a signaling cell used in the first embodiment.

FIG. 5 is a diagram showing a signaling cell transfer sequence in the first embodiment.

FIG. 6 is a diagram showing a format of a signaling cell used in the second embodiment.

FIG. 7 is a diagram showing a signaling cell transfer sequence in the second embodiment.

[Fig. 8] Of the signaling cells used in the third embodiment,
It is a figure which shows the format of the cell used for transfer of a signal value.

[Fig. 9] Of the signaling cells used in the third embodiment,
It is a figure which shows the format of the cell used for transfer of a dial pulse.

FIG. 10 is a diagram showing a cell transfer sequence in a third embodiment.

FIG. 11 is a diagram showing a cell transfer sequence in the fourth embodiment.

FIG. 12 is a diagram showing a format of a signaling cell used in the fifth embodiment.

FIG. 13 is a dial pulse speed 10 in the fifth embodiment.
It is a figure which shows the cell transfer sequence in case of pps.

FIG. 14 is a dial pulse speed 20 in the fifth embodiment.
It is a figure which shows the cell transfer sequence in case of pps.

FIG. 15 is a dial pulse speed 10 in the sixth embodiment.
It is a figure which shows the cell transfer sequence in case of pps.

16 is a diagram showing a format of a signaling cell 16 used in Example 7. FIG.

FIG. 17 is a diagram showing a signaling cell transfer sequence according to the seventh embodiment.

FIG. 18: OA for transferring alarm information in ATM network
It is a figure which shows the format of M cell.

FIG. 19 is a configuration diagram of a signaling processing unit according to the eighth embodiment.

FIG. 20 shows a VP-AIS cell and a VP among OAM cells.
FIG. 6 is a diagram showing a transmission sequence of a FERF cell.

FIG. 21 is a diagram showing a sequence when a VP-AIS state is detected in Example 8.

FIG. 22 is a diagram showing a sequence activated when the communication partner detects VP-AIS.

FIG. 23 is a diagram showing a sequence at the time of detecting a VP-AIS state release in the eighth embodiment.

FIG. 24 is a diagram showing a sequence activated when the communication partner detects the release of the VP-AIS state.

FIG. 25: A VP-FERF cell is generated in an ATM network.
It is a figure which shows being transmitted.

FIG. 26 is a diagram showing a sequence at the time of detecting the VP-FERF state and at the time of detecting the release of the VP-FERF state in the ninth embodiment.

FIG. 27 is a diagram showing a sequence activated when the communication partner detects VP-FERF state detection or VP-FERF state release.

[Fig. 28] Fig. 28 is a diagram illustrating a method of a transfer format of signaling information of a common line signaling method.

FIG. 29 is a signaling processing unit 2 used in the tenth embodiment.
It is a block diagram of.

FIG. 30 is a diagram showing a sequence at the time of detecting a VP-AIS state and a VP-AIS state release in the tenth embodiment.

FIG. 31 is a diagram showing a sequence at the time of detecting a VP-FERF state and a VP-FERF state release in the eleventh embodiment.

FIG. 32 is a diagram showing a configuration of an ATM multiplexer in a conventional cell transfer method.

FIG. 33 is a diagram showing a signaling cell transfer sequence in a conventional cell transfer method.

[Explanation of symbols]

1 signaling processing unit, 2 voice cell assembly processing unit, 3
Multiplexing unit, 4 separating unit, 5 voice cell disassembling processing unit, 6
Signaling bit extraction circuit, 7 Signaling bit display register, 8 Interrupt timing generation circuit, 9
CPU, 10 work RAM, 11 transmission circuit, 12
Reception circuit, 13 interrupt control circuit, 14 signaling bit setting register, 15 signaling bit transmission circuit, 16 signaling cell, 161 ATM layer header, 162 type field, 163 signal value field, 164 time stamp field, 165 error detection code field, 166 Length field, 167 pulse count field, 168 pulse speed field, 169 channel number field,
17 OAM cell, 171 ATM layer header, 17
2 OAM type field, 173 OAM function type field, 174 OAM function type specific field,
175 reserve field, 176 CRC field, 18 signaling slot designating circuit, 19 signaling data receiving circuit, 20 LAPD frame processing circuit, 21 signaling data transmitting circuit, 22 voice cell assembly processing section communication circuit, 23 voice cell disassembly processing section communication circuit, 24 LAPD frames, 241 address fields, 242 control fields, 243 information fields, 244 FCS fields, 25 layer 3 messages.

Claims (11)

[Claims] 1. On the transmitting side, a step of extracting a signaling bit indicating a change in the state of a signal line from each terminal channel and storing it in a corresponding channel register for multiplexing, and the signaling for each channel stored in the register When the bit transition state is monitored and the transition of the state is detected, a step of generating a signaling cell carrying a time signal (time stamp) based on the detection state and the detection time; and on the receiving side, when the signaling cell is received. , The step of setting the state of the signaling bit in the signaling setting register of the corresponding channel according to the rule corresponding to the transmitting side, and after the state is set in the setting register, when the time of the time signal in the received signaling cell elapses, the above setting is performed. Set the register to the detected state in the received signaling cell A cell transfer method in an ATM network, which comprises the steps of: transferring the state of each signaling bit of the setting register to each terminal channel. 2. A step of generating a signaling cell on a transmitting side for each corresponding channel, and mounting a plurality of state change point information in which a detection state and a detection time are paired in one signaling cell. , When the receiving side receives a signaling cell and detects multiple pieces of state change point information, the step of setting the state of the signaling bit in the setting register according to the multiple pieces of information and the detection state after the time signal has elapsed The step of performing is repeated a plurality of times as described above.
A cell transfer method in the described ATM network. 3. The transmission side monitors the state of the signal line from each terminal channel, and when detecting a change from a call disconnection state to a busy state or a call state to a disconnected state, the above state change is detected. Generating a first signaling cell shown in the following, extracting a signaling bit indicating a dial pulse of the signal line of the channel and storing it in a corresponding channel register for multiplexing, and signaling for each channel stored in the register. When the state of the dial pulse of the bit is monitored and the transition of the state is detected, a step of generating a second signaling cell carrying a time signal (time stamp) based on the detection state and the detection time; Transferring the state change of the signal line to the corresponding channel when receiving the first signaling cell indicating the state change; When the second signaling cell is received, the step of setting the state of the signaling bit in the signaling setting register of the corresponding channel according to the rule corresponding to the transmitting side; and after the state is set in the setting register, the received second Upon elapse of the time signal in the signaling cell, setting the setting register to the detected state in the received second signaling cell, and transferring the state of each signaling bit of the setting register to each terminal channel. A cell transfer method in an ATM network, comprising: 4. Further, when the transmitting side detects the dial pulse and does not detect the next pulse after a fixed time, the step of transmitting a third signaling cell; and the receiving side, the third signaling cell. 4. The cell transfer method in an ATM network according to claim 3, further comprising a step of transferring a predetermined signal after a predetermined time after the dial pulse transferred to the terminal side when the cell is received. 5. Further, the transmission side measures the speed of the dial pulse and adds the speed information to the second signaling cell, and the reception side receives the second signaling cell, The cell transfer method in an ATM network according to claim 3, wherein a dial pulse corresponding to the added speed information is created and transferred to a corresponding channel. 6. Further, the second signaling cell is generated on the transmitting side for each corresponding channel, and the number of dialing pulses for a certain period of time is mounted in one signaling cell to generate the second signaling cell. 6. The cell transfer method in an ATM network according to claim 5, wherein the receiving side receives the second signaling cell and transfers a predetermined dialing pulse to the corresponding channel according to the number of detected dialing pulses. . 7. Further, on the transmission side, if the transmission state continues for each channel and there is no state transition, signaling that carries the identifier and state information of each channel that has not been the above state transition multiplexed in the same virtual path. When a cell is generated and a signaling cell carrying the above-mentioned status information is received on the receiving side, a step of confirming normal transfer of each channel from each channel identifier and status information in the cell is added. AT according to claim 1 or claim 3
Cell transfer method in M network. 8. An OAM (Operation And Maintenance) which is warning information from the system to the virtual channel.
AIS (Alarm Indication Signal) in the cell field
FERF (Far End) is added to the cell or field with the code.
Receive Failure) When a cell with a code is received,
A step of temporarily storing the value of the signaling bit setting register of each terminal channel multiplexed on the virtual channel, and then setting the value of the setting register to an alarm state and notifying each terminal; When no OAM cell is received for a predetermined time, or when a signal cell valid in the alarm state is received, a step of returning the value of the signaling bit setting register to the temporary storage value and notifying each terminal, A cell transfer method in an ATM network, comprising the step of transmitting a signaling cell in which a field value describes a signaling value from each terminal line to each corresponding channel which is communicating with each other. 9. Further, when a cell having an AIS code in a field of an OAM cell is received from the system, a step of transmitting an OAM cell having a FERF code in the field to the virtual channel, and the ATM multiplexer manages the cell. Each of the terminals has a step of transmitting a signaling cell in which a field value is described as being communicated to each corresponding channel in which the terminals are communicating with each other, and a step of stopping the transmission of the voice cell if necessary. 9. The cell transfer method in an ATM network according to claim 8. 10. An OAM (Operation And Maintenanc) which is warning information from a system to a virtual channel.
e) When a cell having an AIS code or FERF code in the cell field is received, the call of each terminal being received is initialized and common to each terminal channel multiplexed with the above virtual channel in the terminal direction. A step of transmitting an initialization message by a line signaling method, a step of discarding signaling information of the common line signaling method other than the disconnection message from each terminal in a state where the OAM cell having the AIS code or the FERF code is received, If the OAM cell having the AIS code or the FERF code is not received for a predetermined time, or if a valid signal cell is received in the alarm state, a step of notifying the cell assembly processing unit that the alarm state is released, and the alarm release After entering the status, messages from the above terminals will be received. A cell transfer method in an ATM network comprising the steps of initiating cell assembly and transmitting cells to the network. 11. Further, when a cell having an AIS code in an OAM cell field is received from the system, a step of transmitting an OAM cell having a FERF code in the field is added to the virtual channel. A cell transfer method in an ATM network according to claim 10.