JP3148364B2 - Voice data integrated switch system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice data integrated switch system for integrating a digital exchange with a star type local area network (LAN) using multiple subscriber lines for integrating and transmitting packet data and voice data. According to.

[0002]

2. Description of the Related Art As an example of a star type LAN using multiple subscriber lines for transmitting packet data and voice data in an integrated manner, an IEEE (Institute of Electrical and Electronics)
tronicEngineers) 802.9 Committee is standardizing IVDLAN (Integlated Voice and Data LA)
N). In consideration of the easiness of connection between a conventional switching network and a packet type communication network, IVDLAN uses ISDN (Integrated Services Digital Network) as voice data.
The same 2B + D channel configuration and protocol as the basic interface k), and IEEE 8 as packet type data
LAN MAC (Media Acces
s Control) The channel and the protocol containing the frame can be used.

As a method of realizing such a multiple subscriber line with an exchange composed of a central processing unit, a digital switch, and a plurality of subscriber line circuits which are controlled in a distributed manner,
For example, IEICE Transactions B-1 Vol.J72-B-1 No1
1 (November 1989) "Construction and Performance Evaluation of Integrated Voice / Data LAN" is available. In the above prior art, there has been proposed a system in which packet-type data is exchanged in a packet switch device accommodating multiple subscriber lines, voice data is separated, transferred to a conventional digital exchange, and switched and connected by a digital switch. I have. According to this method, the voice data exchange connection can be realized using the circuit switching function of the conventional exchange as it is,
Conventionally, accommodating and exchanging of multiple subscriber lines such as IVDLAN can be easily realized by a digital exchange.

[0004]

In the above prior art, a method for accommodating multiple subscriber lines, a method for exchanging packet data, and a basic method for connecting voice data to an exchange are described. When a packet-type data is newly accommodated in a conventional circuit-switched digital switch to realize a switching device, no concrete method for realizing them as one switching system is disclosed.

For example, no consideration has been given to a method of realizing specific communication means between a circuit for accommodating multiple subscriber lines for packet data and a conventional digital exchange. Also,
For system management, it is necessary to collectively manage the separate management for the digital switching equipment and the packet switching equipment.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a voice data integrated switch system having communication means between a multi-subscriber line accommodation circuit and a conventional digital exchange. .

It is another object of the present invention to provide a voice data integrated switch system for collectively managing systems.

[0008]

In order to solve the above-mentioned problems, the present invention provides a method for connecting one or two terminals to which a circuit switching terminal is connected.
The above-described circuit switching module, one or more packet switching modules to which the voice / data / packet integrated terminal is connected, and a switch for exchanging digital information;
A central processing unit for controlling the switch unit, wherein the packet switching module and the circuit switching module are respectively connected to the switch unit by a switch interface TDM bus, and the packet switching module An audio data packet integration interface that divides information from a packet integration terminal into a packet, information of a unit to be circuit-switched by the switch unit, and control information of the information, and respectively transmits a voice data packet integration interface, and a packet that transmits packet information. A bus, a packet control unit for controlling transmission and reception of packet information, and a unit of information exchanged by the switch unit, which is allocated to a fixed channel and transmitted.
A TDM bus, a control bus for allocating control information to a fixed channel for transmission, and information on the TDM bus and information on the control bus, which are multiplexed to the switch unit via the switch interface TDM bus. And a switch interface for transmitting, wherein the voice data packet integration interface detects a failure from information from the voice / data / packet integration terminal and information in the voice data packet integration interface, and detects a failure on the control bus. A central processing unit that analyzes the control information, instructs the switch unit to specify a replacement destination, and sends control information to the replacement destination; and Means for analyzing and managing fault information of the The TD received via the DM bus
The exchange processing instructed by the central processing unit is performed on the information on the M bus, the information and the control information for the exchange destination are multiplexed, and the corresponding switch interface T
A voice data integrated switch system for transmitting to a DM bus is provided.

[0009]

Furthermore, the switch interface, detects a failure from the control information on the bus for information and the control on the TDM bus, also possible to output the fault information
No.

[0011]

[0012]

[0013]

[0014]

[0015]

In the circuit switching module, the B channel from the ISDN terminal of the circuit switching terminal is allocated to a fixed channel on the TDM bus in the circuit switching module, and the control information of the information is stored in the information on the control bus. Is allocated to the fixed channel.

[0017]

[0018]

[0019]

[0020]

According to the present invention, the voice data packets unified interface, when a fault is detected from the information and the information in the audio data packets integration interface from the speech data packets integrated terminal, outputs the failure information .

The central processing unit analyzes the fault information added to the control information and manages the terminals and the system.

[0022]

FIG. 1 shows the configuration of a first embodiment of a voice / data integrated switch device which realizes asynchronous packet type data exchange. Hereinafter, the configuration is functionally divided for the purpose of explanation, but this is a logical division and does not define an actual physical structure.

The conventional digital circuit exchange does not have an asynchronous packet type data exchange function, and has a central processing unit (central processing unit: CP) 2 for executing call processing of a circuit exchange call and operation and management of the system, and a 64 kbit. Switching device (switch unit: SWN) 1 that realizes exchange in units of / s
And a line switching module 6 for terminating a subscriber line such as a digital line such as ISDN or an analog line and connecting to the SWN 1.

The voice / data integrated switch device according to the present embodiment is an I / O device which is conventionally realized by a digital circuit switch.
In order to realize asynchronous packet-type data exchange with various circuit-switching functions such as SDN, a packet-switching module 3 having a packet-type data switching function added to the function of the conventional circuit-switching module 6 has been added. It is realized by connecting with the same interface as the module.

That is, as the packet switching module 3, a line interface circuit of a conventional digital circuit switch, a time-division data transfer bus (TDM bus) 37 for multiplexing and transferring voice data, and a line interface circuit and CP2 Μ of the control bus that communicates control information
Bus 38 between P, TDM bus 37 and bus 38 between μP
And a SWN interface circuit 34 of a switch interface for connecting the switch to the SWN1 and the CP2, and a packet bus 35 for packet-type data exchange.
A polling control circuit (PCC) 33 for controlling an access right of a packet bus 35; a polling bus 36 for outputting a polling signal; and a multi-subscriber line for terminating a line of a terminal for performing integrated voice / data / packet communication. Voice / data / packet integrated interfaces (IVD line interfaces) 31 and 32 having an accommodation function. The packet switching module 3 connects to SWN1 via the SWN interface circuit 34.

The IVD of the packet switching module 3
The line interfaces 31 and 32 are connected to the IVD lines 7 and 8, which are voice / data integrated interface lines, that is, two B channels similar to the ISDN basic interface, one D channel for communicating control information, and user packet data. Multiplexed P channels to be handled (2
Terminate the physical line (B + D + P channel). The IVD line interface separates and multiplexes each channel, and the B channel is transmitted via the TDM bus 37 to SWN1 which performs B channel switching. Further, the IVD line interface transmits control information of the D channel information to the CP 2 via the μP bus 38. The IVD line interface sends out P-channel packet data to the packet bus 35 when acquiring the access right.

Further, the packet switching module 3
In addition to the VD line, similarly to the line switching module 6 of the conventional digital line switch, an ISDN line interface accommodating an ISDN line and an analog line and an analog line interface may be provided. The ISDN line interface terminates two B channels of the ISDN basic interface and one D channel physical line for communicating control information, demultiplexes each channel, and the B channel is a TDM bus to SWN1 which performs B channel switching. 37, the control information of the D channel information is analyzed and
8 to CP2. The analog line interface converts audio signals from analog terminals such as telephones into A
/ D conversion is performed to make one B channel, and the B channel is transmitted via the TDM bus 37 to the SWN 1 performing B channel exchange. As described above, the packet switching module 3 performs the line switching processing of the 2B channel of the IVD line interface, the 2B channel of the ISDN line interface, and the voice channel of the analog line interface by the circuit switching function.

Further, a packet line interface for directly connecting an IEEE 802 system LAN packet terminal may be accommodated. The packet line interface transfers the packet data to the packet bus 35 when the access right is acquired.
To send to. By the packet switching function of the packet switching module 3, the packet switching processing of the packet line interface can be performed in the same manner as the processing of the P channel packet data of the IVD line interface.

The CP2 analyzes the control information, instructs the switch unit of a replacement destination, and sends out control information for the replacement destination. The TSW 12 of the SWN1 transmits the SWN μp-μp I through the switch interface TDM bus. / F
The exchange processing instructed by the central processing unit is performed on the information on the TDM bus received at 11, and the information and the control information for the exchange destination are multiplexed and transmitted to the corresponding switch interface TDM bus.

Next, circuit switching processing and packet switching processing in the packet switching module 3 will be described.

First, the circuit switching function of the packet switching module 3 will be described with reference to FIG. FIG. 2 shows a detailed configuration for realizing the circuit switching function of this embodiment. Regarding transmission and reception of circuit-switched data, the IVD terminals 4A and IV
The following describes an example of communication with the D terminal 4B.

In FIG. 2, the layer 1 terminating unit 3 12 in the IVD line interface is connected to the I
The VD terminal 4A is connected to demultiplex the circuit switching data, the circuit call control information, and the P channel which is packet data. The TSW 3100 transmits the data on the TDM bus or receives data on the TDM bus.
The B channel is demultiplexed in a time division manner. The TDM bus interface 3101 is connected to the TDM bus 37, sends out the B channel to a pre-assigned position,
The B channel addressed to the terminal 4A is received. The FEC interface 3104 is connected to the μP bus 38, sends out the D channel, and receives the D channel addressed to the IVD terminal 4A. The packet transmission / reception unit 311 accumulates packets in an internal packet buffer, and is connected to the packet bus 35 via a packet bus interface. The line interface controller (TC) 3103
The control in the line interface 31 is performed, and the outgoing call information of the B channel is detected. The D channel control circuit 3102
The D channel is terminated in Layer 2 and the contents are analyzed. Access to data transmission to the packet bus 35 is managed by polling from the polling control unit 33 via the polling bus 36 . The TDM bus interface 341 of the SWN 34 is connected to the TDM bus 37, takes out the B channel of the destination other than the packet switching module 3, and sends the B channel to a position where the B channel addressed to itself is allocated in advance. I do. The FEC interface 345 is connected to the μP bus 38 and transmits and receives the D channel. The PLL 347 extracts a clock from the data from the SWN 1 and sends out the clock to the clock line 355. SWN1 has a clock source for outputting a basic clock, transfers data to the TDM bus 37 based on the clock, and the PLL 347 extracts a clock from the data on the TDM bus 37, and generates a TDM signal based on the clock. The data is transferred to the bus 37. I / F between SWNμp-μp
343 sets the B channel in the packet switching module to S
The data of the TDM bus 37 is transferred to be accommodated in the TSW 12 of the WN1. Front - End control microcomputer (FEC) 346 reads the TC3103 information of each IVD line interface 31, the information, after format proboscis according to the procedure of communication with CP2, according to the procedure of the communication between SWN1 with FEC3 46 Interface between microcomputers (SWNμp-μ
The data is transferred to the CP 2 via the I / F (inter-p I / F) 343.

Transmission of the circuit switching data from the IVD terminal 4A to the IVD terminal 4B is performed by the IV connecting the IVD terminal 4A.
It is terminated by the layer 1 termination section 3 1 2 D line interface 31, a circuit-switched data and circuit call control information 2
The B + D channel is separated from the P channel which is packet data. Subsequent B channel connection processing of the 2B + D channel performs the same processing for the ISDN basic interface line accommodated in the packet switching module and the circuit switching module. Layer 1 termination section 3 1
In 2, 2B + D is separated into a B channel and a D channel. The separated D channel is connected to the D channel control circuit 31.
02 is terminated in Layer 2 and is notified to a line interface controller (TC) 3103 that controls the IVD line interface 31. In TC3103, IV
Layer 3 information such as call information from the D terminal 4A is not decoded, and the call information from the
Notify 2. CP2 is an IVD line interface 3
1 to decode the call information from the IVD terminal 4A and recognize that there is a call for line connection from the IVD terminal 4A. TC3103 to C
Communication of control data to P2 is performed as follows. The SWN interface circuit 3 is connected to the μP bus 38 including the address line 381, the data line 382, and the control line 383.
The front-end control microcomputer (FEC) 346 in each of the IVD line interfaces 31
Polling the TC3103 of the above to read information. FE
After the C 346 formats the information according to the communication procedure with the CP 2, the C 346 communicates with the CP via the microcomputer interface (SWN μp-μp I / F) 343 according to the communication procedure between the SWN 1 and the FEC 364.
2 is performed. The I / F 343 between SWN μp and μp has a function of transferring data of the TDM bus 37 in order to accommodate the B channel in the packet switching module in the TSW 12 of SWN1. FIG. 9 shows the data format of the SWN interface TDM bus 39. In FIG. 9, time slots 1 to n are allocated to each B channel. TC3
The control data from 103 to CP2 is allocated to one channel of the TDM bus, for example, a predetermined fixed channel time slot m. The control data from FEC 346 is multiplexed into time slot m, and
The data is transmitted to the interface TDM bus 39. In TSW12 of SWN1, the received SWN interface TDM
From the bus 39, the time slot m of the channel corresponding to the SWN μp-μp I / F is identified and separated, and the channel is connected to the CP2 to perform communication between the FEC 346 and the CP2.

Next, CP2 analyzes the outgoing call information from TC 3103 and notifies IVD terminal 4B of the IVD line interface 32 in order to notify that there is an incoming line connection.
The incoming call information is transferred to C3203. Here, the data communication of the incoming call information from the CP2 to the TC3203 is performed as described below as in the above. CP2 transfers data to FEC 346 via SWN interface TDM bus 39. FEC 346 is the SWN interface TD
A time slot m of a channel for SWN μp-μp communication is identified from the M bus 39. Also, FEC 346 is
TC3203 by address line 381 of bus 38 between μP
Is transmitted to the data line 382 and the data received from the CP 2 is transmitted to the TC 3203. The TC 3203 recognizes the incoming call information of the line connection, sets data of the incoming call information in the D channel control circuit 3102, and assembles the information of the layer 2 in the D channel control circuit 3102, and the layer 1 terminating unit 322 The IVD terminal 4B confirms the incoming call. For the call setup procedure between the terminal and CP2, see C
This is performed according to the procedure shown in CITT Recommendation I430.

In addition, the communication between SWN μp and μp may be a standard multi-line interface shown in FIG. 3 separately from the configuration shown in FIG. FIG. 10 shows a format of the SWN interface using the multi-line interface.
In FIG. 10, frame synchronization information is added, and time slots 1 to n are assigned to each B channel. Control data from the TC 3103 to the CP 2 is allocated to a predetermined fixed channel time slot m in the same manner as described above.

That is, as shown in FIG.
-Μp communication channel data and B channel data
And sends to the ISDN standard interface circuit 3430 having a line termination function of an ISDN primary rate interface shown in CCITT Recommendation I431. The channel multiplexing / demultiplexing unit 3431 in the ISDN standard interface circuit 3430 allocates the communication channel data between the SNW μp-μp to the time slot m, multiplexes it with the B channel data, and converts the data into the ISDN interface by the interface formatting unit 3433 and sends out. Even within SWN1, it houses a circuit similar to the ISDN standard interface circuit 343 0, connecting the ISDN primary line to SWN1.

Layer 2 of ISDN Primary Interface
In the cases 3 and 3, the FEC 346 sets in advance the call according to the ISDN call setting procedure indicated in the CCITT I-series recommendation in accordance with an instruction from the CP 2 when the system is started. The number of channels of the TDM bus is adjusted to the number of channels that can be transferred by the standard interface. With this standard interface line, the SWN μp-μp communication channel and the B channel data are connected to SWN1, the SWN μp-μp communication channel fixedly assigned is identified, and the channel is connected to CP2.

Here, the ISDN primary rate interface is used as an example, but the standard interface is TT
A standardized multi-line interface such as a standard interface such as a C standard 2 Mbps interface and a high-speed digital leased line interface may be used.

The TCs 3103 and 3203 represent B
In addition to the channel connection processing, resource management of the line interface circuit, that is, failure detection, failure processing, reset instruction, internal initialization processing, state notification, and the like of the line interface circuit are transmitted to and received from the CP2.

The fault detection and its processing include, for example, when the physical line 7 of the IVD line interface 31 is cut off, the layer 1 termination unit 3 12 detects that the line has been cut off, and outputs the fault information of the line cut-off. via the channel control unit 3 10 2, or by sending a direct interrupt signal to the TC3103, and notifies the fault generation to the TC3103. That is, the layer 1 termination unit 3 12 or the TC 3103
Each of the units has a failure detection unit, and the failure detection unit detects the failure and notifies the TC 3103 of the failure. TC310
3 notifies the FEC 346 via the inter-μP bus 38 of the information on the occurrence of the failure in the same manner as the notification of the call setting procedure of the B channel. The FEC 346 similarly collects fault information from TCs in each line interface inside the packet switching module 3 and notifies the CP 2 via the SWN interface TDM bus 39. Similarly, when a plurality of packet switching modules are connected, the notification is made to CP2.

By defining a failure of each hardware in advance in each hardware and CP2 as failure information,
The failure occurrence of each hardware can be collected by the CP 2 and held as management information, or output from the output unit. When the failure has been recovered, similarly, each hardware detects the recovery from the failure and notifies the CP2. CP
2 can perform processing based on these pieces of failure information. For example, if there is an incoming call, it is compared with the management information, and if the other party is an incoming call to a line in which a failure has occurred, the call is disconnected or a notification that the failure has occurred is sent to the normal destination. If it is a line, connection processing is performed. Thereby, unnecessary connection processing can be avoided.

When a failure occurs in the TC itself or when the line interface is not mounted, the FEC 346 polls all the TCs in the module. The occurrence of a failure can be detected by the FEC 346 for the failure of the interface.
The FEC 346 also notifies the CP2 of such failure information via the SWN interface TDM bus 39.

As described above, the detecting means is provided in each unit, and the detected information is transmitted to the CP in the same manner as the call setting procedure notification.
Notify 2. The CP2 collects the status of all TCs in the integrated voice / data switch device by communication between SWN μp-μp, thereby obtaining an analog line interface, IS
Management of dynamic failure information or mounting information of the entire DN line interface and IVD line interface,
The same process can be performed for any interface device.
And it can be done in one place.

[0044] IVD line interface TSW has a function of connecting B channels of the line interface to the idle time slots of the TDM bus 37 (TS), TD
M bus 37 and SWN interface TDM bus 39
It is connected to the SWN1 over. TSW of SWN interface circuit 34 performs allocation of TS of the TDM bus 37 and SWN in <br/> Tafe scan TDM bus 39.

When the IVD terminal 4B responds to the incoming call of the ISDN line, the response information on the D channel is transmitted to the TC3203 and the FE.
CP2 is notified to CP2 via C346, and CP2 transmits TS for IVD terminal 4A and IVD terminal 4B for B channel communication.
W12 and TSW342 are controlled to perform channel setting,
The B channel received from the IVD terminal 4A is connected to the SWN1 via the uplink time division multiplex bus 371, exchanged by the TSW12 and exchanged via the downlink TDM bus 372 to the IVD terminal 4A.
B data to be transmitted to B. The B channel received from the IVD terminal 4B is also transmitted via the uplink TDM bus 371.
The call is exchanged by the TSW 12 and becomes the transmission B channel data to the IVD terminal 4A via the downstream TDM bus 372, so that the call between the IVD terminal 4A and the IVD terminal 4B is executed.

In the B-channel data communication, synchronous transfer is performed in the system to avoid a data error due to a data slip due to a clock frequency shift.

[0047] T DM bus 37 and SWN1 to use
The clocks in the system are distributed as follows. Sand
Chi, clock generator 13 of SWN1 generates a basic clock (8 KHz, 8 MHz). SWN with this clock
1 is transmitted to the SWN interface circuit 34 using one or several signals of the SWN interface TDM bus 39. Receives this clock reproduced by PLL347 of SWN interface circuit 34, SWN
Drives the interface circuit 34, is supplied with a clock line 355 to each line interface. The base clock and the TDM bus 37 synchronized with this clock are used as the data communication clock of the line interface circuit.
Is supplied to all the line interfaces via the SWN1 to enable synchronous transfer of the synchronous B channel.

Alternatively, the SWN interface circuit 34
Will extract the basic clock from the B channel data received from the SWF interface TDM bus,
A method of reproducing at 347 and supplying it to each line interface circuit may be used.

As described above, a voice / data / packet integrated switch system can be realized.

Next, the realization of the packet switching function in the packet switching module 3 of the first embodiment will be described with reference to FIG. IVD line is 2B + D + P as described above
The 2B + D is processed by the circuit switching function of the digital circuit switch, and the P channel, which is user packet data, is exchanged by a packet bus and a polling bus, which are packet switching functions unique to the packet switching module. .

In FIG. 4, an IVD terminal 4A transmits an IVD
Transmission of the packet data to the terminal 4B is performed by the IVD terminal 4A.
Is terminated at the layer 1 terminating circuit 312 of the IVD line interface 31 connecting the P channel and 2B +
D and 2B + D perform circuit switching by the circuit switching function described above.

When packet data is transmitted from the IVD terminal 4A via the P channel, the packet from the terminal
The data is sent to the IVD line interface 31 according to the procedure standardized in the EEE802.9 draft, temporarily stored in the transmission buffer 3110, and waits for transmission to the packet bus 35.

The data in the buffer is stored in the above-mentioned well-known example, IEICE Transactions B-1 Vol. J72-B-1
No. 11 (November 1989) "Configuration and Performance Evaluation of Integrated Voice / Data LAN" and transfer to packet bus 35 by the polling method.

The polling method in this embodiment operates as follows. Polling control circuit (PCC) 33
Polls each IVD line interface circuit via the polling bus 36 in order to control packet transmission and reception. In this case, the polling counter 3
The polling unit 31 performs polling by sequentially outputting a value corresponding to an address predetermined for each IVD line interface circuit to the address line 361. The bus transmission right control unit 3113 of the IVD line interface 31 monitors the address line 361, and outputs a transmission request signal 363 if packet data to be transmitted is stored in the transmission buffer 3110 when its own address is indicated. . PCC33,
The use state of the packet bus 35 is monitored by the transmission display 365. If the packet bus 35 is empty when the transmission request signal 363 is received, the transmission permission is notified to the bus transmission right control unit 3113 via the transmission permission 364. I do. The bus transmission right control unit 3113 thereby makes the transmission buffer control unit 3
It instructs 112 to send data from the transmission buffer 3110 and sends packet data to the packet bus 35. Here, the PCC 33 is provided with a TC 334, which is connected to the μp bus similarly to the TC of each circuit interface to enable control communication with the CP2. The TC 334 transmits / receives information such as fault detection, fault processing, initialization, status notification, and the like inside the interface and the polling control unit, similar to the TC3103 and TC3203 of the IVD line interface. By providing this communication interface, the information on the implementation / non-implementation of the IVD line interface managed by the CP2 in the communication with the TC of each line interface can be transmitted to the T.
Notify C334. The TC 334 sets this information in the polling memory 332. Polling counter 331
The data of the polling memory 332 is read with the value of
The polling corresponding to the unmounted IVD line interface circuit is skipped, and the polling rate to the mounted IVD line interface circuit is increased. By effectively performing polling in this way, the utilization rate of the packet bus is improved, and the transmission wait time of packet data is reduced. Further, by transmitting the next polling address in advance during the data transfer of the packet bus 35 based on the polling counter value, the transmission waiting is performed by the preceding polling which precedes the transmission preparation of the next transmit buffer which can be transmitted. The time may be reduced.

According to the standard draft of IEEE802.9, P
As shown in FIG. 5, the format of the packet data of the channel includes a destination address field (DA), a source address field (SA), and data. Also in this embodiment, a data format as shown in FIG. 5 can be adopted. The SA of the packet data transmitted from the IVD line interface 31 is the IVD terminal 4B
The packet address of the IVD terminal 4B is stored in the packet address comparison unit 3216 of the IVD line interface 32. The IDV line interface 32 is a packet bus 3
5 is monitored, and the packet address comparing unit 3216
Compare the DA section. The DA of the packet from the IVD terminal 4A indicates the DA of the IVD terminal 4B, and is compared by the packet address comparing unit 3216 to determine that the packet data is for the IVD terminal 4B.
14 receives the packet data. The packet data stored in the receiving buffer is sequentially read out, multiplexed with the B and D data transferred by the TDM bus 37 and the μp bus 38 by the layer 1 terminating unit 322, and the IVD terminal 4B
Send to As a result, the packet data from the IVD terminal 4A is transferred to the IVD terminal 4B.

The packet bus 35 is connected to the SWN as described above.
The transfer is performed in synchronization with the basic clock by the PCC 33 which receives the basic clock from the first clock generator 13, and the packet processing unit in the IVD line interface also operates in synchronization with this clock. Thus, packet data communication between the IVD line interface units via the packet bus 35 can be performed as synchronous data, and data can be received by a simple synchronization circuit of about two flip-flops.

When a clock disturbance of the entire system occurs due to system switching on the SWN1 side or the like, the CP2 and the TC2 are used to prevent the PCC 33 and the packet data receiving circuit from receiving defective data due to the clock disturbance. Command to reset via. Further, when the PCC has a dual structure of the current system and the standby system, communication between the PCCs and the CP2 can switch the failed PCC according to an instruction from the CP2 to perform a switching operation to the normal PCC.

As described above, the packet switching module 3
Are the TDM bus 37 on the back wiring board of the circuit switching module 6 of the digital exchange,
8. It can be realized by adding more than ten signal lines of the packet bus 35 and the polling bus 36 in addition to the clock signal. Also, according to this method, the analog line interface, I,
The SDN line interface and the like can be accommodated in the packet switching module 3 as it is.

The number of lines of the IVD line interface is increased for each packet switching module. That is, the SWN1 has a plurality of packet switching module interface circuits, and can be added by connecting the added packet switching modules in units of modules. This interface circuit can be realized by the same interface as the interface of the circuit switching module as described above.

FIG. 6 shows the configuration of a second embodiment of the voice / data integrated switch device. The voice / data integrated switch device in the second embodiment includes a packet bus 19 and a polling bus, as in the first embodiment, in addition to a circuit switching function such as ISDN realized by a conventional digital circuit switch. 18 and voice, data,
It has a packet integration interface, and further has a second central processing unit (CP) CP15 that performs switching processing of the B channel of the multi-subscriber line, and a second switching device (SWN) SWN14 that performs switching according to the instruction of CP15. . The circuit switching system 20 includes a first central processing unit (C) for executing call processing of the circuit switching call and operation and management of the system.
P) a CP25, a first switching device (SWN) SWN24 for realizing exchange in units of 64 kbit / s, and multiplexing / demultiplexing of information on the TDM bus and control information on the control bus to other devices. and a TDM communication <br/> signal interface 2 3 system and reception, and circuit switching system of other system, connected via the TDM bus communication 5 in a packet switching system, the integrated voice and data switch device Realize.

On the other hand, CP25 and CP15 are connected to SWN2
4 and the SWN 14 are managed, and all the telephone numbers, which are addresses for identifying the terminals accommodated in each SWN, are stored as a table. Between CP15 and CP25, call setting information for interconnecting circuit-switched calls and management information of terminals, line interfaces, and modules accommodated by each CP can be centrally managed. To perform communication 6 between CPs.

As in the first embodiment, an ISDN line and an analog line may be accommodated in the packet switching module by a line switching function.

First, the implementation of the circuit switching function in the packet switching module will be described. Referring to FIG. 7, IVD terminal 1 accommodated in the packet switching module
A procedure for transmitting circuit-switched data from the PC to the IVD terminal 2 will be described.

The layer 1 termination circuit 115 of the IVD line interface A that connects the IVD terminal 1 terminates the layer 1 and separates the P channel, the B channel, and the D channel. Thereafter, the processing method of the 2B + D channel is ISD
This is the same as the circuit switching function of the N basic interface circuit. A D channel control circuit 112 terminates the separated D channel in Layer 2 and controls a line interface controller (TC) for controlling the IVD line interface 11
Notify TC113. In TC113, the IVD terminal 1
It does not decode layer 3 information, such as call switching information for circuit switching from, and notifies the CP 15 of layer 3 information. CP
15 decodes the information from the IVD line interface 11 and recognizes that the IVD terminal 1 has made a call for circuit switching. Further, a telephone number which is a contact address included in the layer 3 information is determined and compared with the telephone number data of all the terminals accommodated by the CP 15, and the telephone number is determined by the IVD terminal 2 in the own packet switching module. Identify that there is. Data communication from the TC 113 to the CP 15 is performed by transferring the data to the CP 15 via the microcomputer interface (μp-μp I / F) as in the first embodiment. The μp-μp I / F communication path is
Transmission is performed using one channel of the TDM bus, for example, a predetermined fixed channel, and the TSW14 of the SWN14 is transmitted.
In the channel 2, the μp
-Identify and separate channel numbers for I / F communication between
The connection is established by connecting this channel to the CP 15. Next, the CP 15 transfers the incoming call information to the TC 123 of the IVD line interface 12 to notify the IVD terminal 2 that there is an incoming call for circuit switching. Where C
Data communication from P15 to TC123 is performed via the μp-μp I / F as described above. According to the transferred data, the TC 123 of the IVD line interface 12 is used.
Recognizes the incoming call information of circuit switching, sets the data of the incoming call information in the D channel control circuit, assembles the layer 2 information in the D channel control circuit 122, and outputs the IVD The call is transmitted to the terminal 2 and the call is received.

The IV accommodated in the packet switching module
The TSW of the D line interface has a function of connecting the B channel of the line interface in the packet switching module to an empty time slot (TS) of the TDM bus,
All the B channel connection data accommodated in the packet switching module is connected to the SWN 14 via the TDM bus . When the IVD terminal 2 responds to the incoming call of the circuit switching, the TC 123 of the IVD line interface 12 notifies the CP 15 of the response information on the D channel. CP15 is IVD
TSW for B channel communication between terminal 1 and IVD terminal 2
142 control to perform channel setting and the reception B channel from IVD terminal 1 via the uplink TDM bus 17 2,
It is connected to the downstream TDM bus 17 1 TSW142 of SWN14, via該下Ri TDM bus 17 1, a transmission B-channel data to the IVD terminal 2. The reception B channel from the IVD terminal 2 is also transmitted via the uplink TDM bus 172.
In TSW142 of SWN14 connected to the down TDM bus 171, via the downlink TDM bus 17 1, IVD terminal 1
The communication between the IVD terminal 1 and the IVD terminal 2 is performed when the transmission B channel data is transmitted.

Next, communication of circuit-switched data from the IVD terminal 1 to the ISDN terminal 3 will be described with reference to FIG. Layer 1 termination circuit 11 5 of IVD line interface 11 for connecting the IVD terminal 1 terminates the layer 1, separating the P and B channels and the D channel. The D channel control circuit terminates the separated D channel in Layer 2 and notifies the TC 113 that controls the IVD line interface 11 to the TC 113. In TC113, IVD
The layer 3 information such as the call switching information of the circuit switching from the terminal 1 is not decoded, and the layer 3 information is transmitted from the TC 113 to the CP.
15 is notified. The CP 15 decodes the information from the IVD line interface 11 and recognizes that a call for circuit switching has been made from the IVD terminal 1. Further, by comparing with the table of the telephone number of the terminal managed by each CP, the telephone number notified at this time is identified as the ISDN terminal 3 managed by the CP 25. Here, communication of data from the TC 113 to the CP 15 is performed by the μp-μP I / F. The telephone number table of each CP has the CP having the telephone number.
It is classified for each connection route to. If CP15 finds that the telephone number is a terminal accommodated by CP25, CP15
To connect the B channel of the IVD terminal 1 to the SWN 24 via the TDM interface 13 to the circuit switching system managed by
4 to the SWN 24, the channel position of the B channel corresponding to the connection from the IVD terminal 1 to the ISDN terminal 3 in the TDM interface, and the circuit switching system 20 if a plurality of TDM interfaces are connected.
The line identification number of the TDM interface 2 3 contained in the notifying via the CP communication 6.

Upon receiving this, the CP 25 decodes the telephone number, compares it with a table of telephone numbers of terminals managed by the CP 25, and compares this with the ISDN terminal 3 connected to the SWN 24.
When it is recognized that the call is incoming to the ISDN terminal 3, the incoming call information is transferred to the TC 213 of the ISDN line interface 21 in order to inform the ISDN terminal 3 that there is an incoming call for circuit switching. TC21
At 3, the incoming call information is set in the D channel control circuit,
Here, the information of the layer 2 is assembled, multiplexed with the channel, and transmitted to the ISDN terminal 3.

Here, the TDM interfaces 13 and 23 shown in FIG. 6 are used to connect the TDM buses 17 and 26 to, for example, a standardized multi-line interface such as an ISDN primary group interface shown in CCITT Recommendation I431 shown in FIG. To TC133 and 23
TD to TS of TSW130 and 230 by instruction of 3
M bus data is allocated and the TDM bus interface 132 is converted into a format conforming to the standard line interface.
And 232. The connection / disconnection instruction of the layers 2 and 3 is performed from each CP, and may be performed at the time of system startup or at the time of TDM.

The inter-CP communication 6 for performing data communication from the CP 15 to the CP 25 includes a CP interface circuit 15 for converting data from the CP 15 into a modem interface or the like.
According to 1 and 251, the line of the TDM bus communication 5 is
This is realized by connecting from CP15 to CP25 with another transmission line 6. Alternatively, the data from the CP interface circuits 151 and 251 are converted to 64 Kbps, connected to the SWNs 14 and 24, allocated to a predetermined channel of the TDM bus, and multiplexed with the audio channel at the TDM interfaces 13 and 23 .
The CP on the other TDM interface which receives the
The communication channel is identified from the voice channel,
Alternatively , the method may be realized by connecting between the control unit 25 and the CP 25 .

The TC of each line interface performs management of the line interface circuit, that is, fault detection / processing, reset instruction, and initialization in accordance with instructions from the CP in addition to the call connection processing. CP25 and CP15 change the state of all TCs connected to each of these SWNs between μp-μp
/ F, the CP 25 collects data managed by the CP 15 via the CP interface circuit 151, and collectively manages the system failure status, the status of each floor line, and the like. For example, when the TDM interface circuit to be transferred is in failure, another TDM interface circuit is selected and transferred. Alternatively, while the SWN to be transferred is in failure, the system management is performed by processing such as sending a busy tone to the calling terminal without performing the transfer processing.

The TSW of the line interface has a function of connecting the B channel of the line data to a vacant time slot (TS) of the TDM bus in its own module.
Channel connection calls can be made via the TDM bus.
N. TSW of TDM interface circuit
Indicates that the assignment of TS between the TDM bus of the own module and the TDM interface connected to the other SWN is CP
Performed according to instructions from. This may be fixedly determined, but here, a method may be used in which the CP allocates an empty TS every time a terminal calls.

Incoming call response information of circuit switching from the ISDN terminal 3 is terminated by the ISDN line interface circuit 2 and notifies the CP 25 of response information on the D channel. C
P25 controls each TSW to make a B channel connection from the IVD terminal 1 to the ISDN terminal 3,
The SWN 24 controls the channel on the TDM interface set for receiving by the ISDN terminal 3 and the B channel from the ISDN terminal 3 via the TDM bus. On the other hand, the CP 15 sets the B channel of the IVD terminal 1 to T
The SWN 14 is controlled and connected to the channel on the DM interface. In this way, the ISD
The B channel is connected to the N terminal 3.

Similarly, the transmission B channel from the ISDN terminal 3 to the IVD terminal 1 becomes the reception B channel data to the IVD terminal 1 via the SWN 24, the TDM interfaces 13, 23, and the SWN 14, whereby the IVD terminal 1 and the I
The call of the SDN terminal 3 is executed.

When a circuit-switched public network is connected in place of the ISDN terminal 3, each CP has a table for determining the telephone number of the public line network as the telephone number of the terminal. Can be connected in the same way by associating with the SWN that houses

In the B-channel data transfer, data is synchronously transferred in the system to avoid a data slip error due to a clock frequency shift. That is, TD
The M bus and the clock source of the SWN 24 are supplied from the clock generator 242 of the SWN 24 with the basic clock (8 kHz, 8 MHz).
z) is generated, and the SWN 24 is driven to synchronize the TDM bus data. At the same time, the basic clock is distributed to the ISDN line interfaces 21 and 22 and the TDM interface 23, and each interface circuit transfers data based on this clock. The TDM interface sends the data of the TDM bus that operates on the basic clock to the TDM interface 13. The TDM interface 13 extracts the basic clock from the data, reproduces the basic clock on the PLL 134, and reproduces the basic clock on the SWN 14 and the TDM bus 17.
Is supplied to the clock generator 142 serving as a clock source for The clock generator 142 is a PLL that pulls in the clock and performs a synchronous operation. The clock generator 142 distributes the basic clock to the IVD line interfaces 11 and 12 of the packet switching module 10, the TDM bus 17, the polling control unit, and the packet bus. Synchronize clocks. Alternatively, the basic clock signal from the clock generator 242 may be connected to the clock generator 142 via a driver circuit and another cable via a driver circuit. Thereby , SWN24 and SWN
14 enables the synchronous transfer of the B channel data connected via.

The above is a description of IS in digital circuit switching.
This is the same method as the connection means of the DN line interface, and the circuit switching function can be easily realized by separating the P channel, the B channel, and the D channel.

The packet switching of the packet switching module 10 is performed by the same means as in the first embodiment. That is, the packet data controlled by the polling control unit is transmitted via the packet bus 19 and the polling bus 18 to the I / O port.
By communicating between VD interfaces, packet data is exchanged between IVD terminals.

As described above, according to the present invention, when a conventional distributed control type digital exchange accommodates a multiplex line in which voice data and packet type data are integrated, the voice channel switching function of the digital exchange and the system Since the management function can be used as it is, the multi-line accommodating circuit and the management function can be realized at low cost.

That is, the subscriber line management function, billing, voice line test function, fault display / processing function, and the like of the exchange can be used as they are for the IVDLAN subscriber circuit. In addition, since conventional analog and digital subscriber accommodation circuits can be used as they are, they are suitable for enhancing the system of multiple subscriber lines. In addition, it is possible to add a digital exchange for each voice / data integrated switch access device, and it is possible to flexibly accommodate subscriber lines from small to large.

Further, by performing control information communication including management information between the access device and the digital exchange,
These can be managed as one system, and a system that can be centrally maintained and operated centrally can be constructed.

[0081]

According to the present invention, in a voice data integrated switch system, a voice data integrated switch system having communication means between a multi-subscriber line accommodation circuit and a digital exchange can be realized. In addition, the system can be managed as one system, and a system can be constructed that allows centralized maintenance and centralized operation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a circuit switching function according to the first embodiment.

FIG. 3 is a block diagram of a multi-line interface.

FIG. 4 is a configuration diagram of a packet switching function according to the first embodiment.

FIG. 5 is a format of packet data.

FIG. 6 is a configuration diagram of a second embodiment.

FIG. 7 is a configuration diagram of a circuit switching function in the packet switching module according to the second embodiment.

FIG. 8 is a configuration diagram of a circuit switching function in a circuit switching system and a packet switching module according to a second embodiment.

FIG. 9 shows a SW interface TDM bus format.

FIG. 10 shows a multiplex line format of the SW interface.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Switching device, 12/342 ... Time switch, 13 ... Clock generator, 2 ... Central processing unit,
3 packet switching module 31/32 multi-subscriber line accommodation function 3102 D channel control circuit 334
3103 and 3203: line interface controller, 3110: transmission buffer, 3112: transmission buffer control unit, 3113: bus transmission right control unit, 312, 322
... Layer 1 termination unit, 3214 ... Reception buffer, 3216
.., A polling control circuit, 331, a polling counter, 332, a polling memory, 34, a switching device interface circuit,
343: Interface between microcomputers, 34
6. Front-end control microcomputer, 34
Reference numeral 30: ISDN standard interface circuit; 3431: channel demultiplexing unit; 3433: interface formatting unit; 347: PLL; 35: packet bus;
55 ... clock line, 36 ... polling bus, 361 ... address line, 363 ... transmission request signal, 364 ... transmission permission,
365: display during transmission, 37, 371, 372: time division data transfer bus, 38: bus between μP, 381: address line, 382: data line, 383: control line, 39: SWN
Interface TDM bus, 4A / 4B ... IVD terminal,
6. Circuit switching module, 7.8 IVD line. 1.2
・ IVD terminal, 10 ... Packet switching module, 11 ・
12: IVD line interface, 24, 14: Switching device, 25, 15: Central processing unit, 18: Polling bus, 19: Packet bus, 132, 232, 13
0 ・ 230 ・ 12 ・ ・ ・ Time switch, 13 ・ 23 ・ ・ ・ TD
M interface, 5 ... TDM bus communication, 17.26 ...
TDM bus, 115/125 ... Layer 1 termination circuit, 11
2.122 ... D-channel termination circuit, 113 / 123.1
33, 233, 213: line interface controller, 151, 251: CP interface circuit, 172
... TDM bus, 20 ... Circuit switching system, 21/22 ...
ISDN line interface, 142, 242 clock generator, 3 ISDN terminal, 134 PLL
6. Communication between CPs, 3. ISDN terminal.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoru Inazawa 180 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Communication Systems Co., Ltd. (56) References JP-A-2-13045 (JP, A) IEICE Transactions, J72-B-I, [11], (Heisei 1-11-25), "Configuration and Performance Evaluation of Integrated Voice / Data LAN", p. 953-960 IEICE Technical Report SE 87-139, 87, [304], (62-12-18, 1987), A Method for Adding a High-Speed Burst Switching Function to a Composite PBX ", P.49-54. IEICE Technical Report SSE 89-75, 89, [195], (1-9-20), “Investigation of Multimedia PBX”, p. 43-48 (58) Fields surveyed (Int. Cl. ^7, DB name) H04L 12/64 H04L 12/56 H04L 12/44 H04Q 3/52 H04Q 11/04

Claims (6)

(57) [Claims] A switch for exchanging digital information with one or more circuit switching modules to which a circuit switching terminal is connected, one or more packet switching modules to which a voice / data / packet integrated terminal is connected, And a central processing unit that controls the switch unit. The packet switching module and the circuit switching module include a switch interface TD in the switch unit.
The packet switching module is connected to each of the M buses, and divides information from the voice / data / packet integrated terminal into a packet, information of a unit which is switched by the switch unit, and control information of the information. A voice data packet integration interface for transmitting, a packet bus for transmitting packet information, a packet control unit for controlling transmission and reception of packet information, and a unit for exchanging information of a unit exchanged by the switch unit to a fixed channel for transmission. a TDM bus, a control bus for transmitting allocation control information to the fixed channel, wherein the information and the information on the control bus on the TDM bus are multiplexed, the switch unit through the switch interface TDM bus And a switch interface for transmitting to the voice data packet. An interface for detecting a failure from information from the voice / data / packet integration terminal and information in the voice / data packet integration interface, and outputting failure information on the control bus; The unit has: means for analyzing the control information, instructing the switch unit for an exchange destination, and transmitting control information to the exchange destination, and means for analyzing and managing fault information from the control bus. The switch unit performs an exchange process instructed by the central processing unit on information on the TDM bus received via the switch interface TDM bus, and transmits the information and control information for the exchange destination. A multiplexed voice data switch system, wherein the multiplexed data is transmitted to a corresponding switch interface TDM bus. 2. The voice data integrated switch system according to claim 1, wherein the switch unit has a clock source for outputting a basic clock, and sends information to the switch interface TDM bus based on the clock source. The switch interface extracts a clock from information on the switch interface TDM bus, and sends information to the switch interface TDM bus based on the clock. 3. A plurality of switching modules to which one or more terminals are connected, a switch unit for switching a destination of information transmitted from each of the terminals, output via each of the switching modules, and controlling the switch unit. At least one of the plurality of switching modules has means for detecting a failure from information from the terminal and information in the switching module and outputting failure information. When the transmission destination of the information from the terminal connected to the other switching module is an exchange module that detects the failure information, the central processing unit may include the failure information detected by the exchange module. An exchange system, wherein the switching unit is controlled based on the switching unit. 4. The integrated voice data switch system according to claim 1, wherein the switch interface detects a failure from information on the TDM bus and control information on the control bus, and outputs the fault to the control bus. An integrated voice data switch system, comprising: a failure detection unit that outputs failure information; and wherein the central processing unit analyzes and manages the failure information. 5. A method according to claim 1 or 2, wherein the voice data integration switch system, said packet switching module, ISD for connecting ISDN terminals line switching terminal
An integrated voice data switch system comprising at least one of an N interface, an analog interface for connecting analog terminals for voice to convert analog information into digital, and a packet interface for connecting packet terminals. . 6. A voice data integrated switch having one or two or more circuit switching devices for connecting a plurality of circuit switching terminals and one or two or more voice data integrating switch devices for connecting a plurality of voice / data / packet integrated terminals. In the system, the circuit switching device includes: a switch unit for exchanging digital information; a central processing unit for controlling the switch unit; and a TDM for transmitting information in a unit exchanged by the switch unit.
A bus, a control bus for transmitting control information, provided corresponding to the other device, prior Symbol multiplexes information and information on the control bus on the TDM bus, TDM to be transmitted to another apparatus A bus communication interface, wherein the voice data integrated switch device includes: a switch unit that exchanges digital information; a central processing unit that controls the switch unit; and information from the voice / data / packet integrated terminal. A packet, a voice data packet integration interface for transmitting the packet data, a packet bus for transmitting the packet information, and a transmission / reception of the packet information. A packet control unit for controlling, and a TDM for transmitting information of a unit exchanged by the switch unit.
TDM bus and the bus, and control bus for transmitting control information provided in correspondence with another device multiplexes the information on the bus for information and the control on the TDM bus, and transmits to the other device A communication interface, and the central processing unit of the circuit switching device and the voice data integrated switch device analyzes the control information, sends out control information to a replacement destination, and instructs the switching unit to a replacement destination. Judge whether the exchange destination is the own apparatus or another apparatus, and if the exchange destination is another apparatus, instruct the TDM bus communication interface to send the signal to another apparatus; The switch unit of the integrated switch device receives the information on the TDM bus, performs exchange processing instructed by the central processing unit, sends the information to the TDM bus, and sends the information to the exchange destination. The TDM bus communication interface sends the corresponding information on the TDM bus to another device upon receiving an instruction from the central processing unit, and transmits the information to another device. And transmitting information from the TDM bus to the TDM bus.