JP2934406B2 - Line concentrator for voice telephone set and communication method for lan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contain a voice telephone set to a LAN. SOLUTION: In the case of making communication from a voice telephone set 5 to a voice telephone set 8 for example, information is exchanged between personal computers 2, 4 ancillary to them via a LAN hub 10, a LAN switch device 50 and a LAN hub 20 and call control is conducted. Voice data of the voice telephone sets 5, 8 are processed into packets into a data part of each MAC frame by TLAs 30, 40 and relays to LAN-SW interfaces 30a, 40a. A frame having fluctuation absorption function is applied to the data part on the interfaces 30a, 40a. Based on the MAC address of the MAC frame, voice data processed as packets are given respectively to the telephone sets 8, 5 via the TLAs 40, 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to IEEE802.
3 LAN conforming to it (Local Area Network) relates to the method of communication voice phone use concentrator and speech system and LAN housing the voice telephone set to the interface.

[0002]

2. Description of the Related Art In conventional intra-office communications, a voice telephone is accommodated by a private branch exchange (PBX) and data communication is conducted by using a LAN, and both are independent. In particular, in recent years, Paco Na Rukon <br/> Manipulator chromatography data (hereinafter, referred to as PC) with the low cost and high functionality, such as, personal computers have become popular in speech telephone moderate general. Along with being this environment that integrates LAN and voice telephone or the like has come to be desired for an office communication system.

[0003]

However, the conventional in-house communication has the following problems. Even if an in-house communication infrastructure is to be integrated by housing a voice telephone in a LAN, the periodicity and real-time characteristics inherent in “voice” are mainly burstiness and high reliability of data communication on the LAN. Therefore, it is difficult to integrate them, and as a result, a PBX facility and a LAN-related facility are required in the office, and two systems of wiring are required accordingly. The present invention integrates a communication infrastructure in a business office into a LAN and realizes accommodation of a voice telephone without requiring a PBX.

[0004]

Means for Solving the Problems] To solve the above problems
According to a first aspect of the present invention, a plurality of selected ports are provided.
Between the selected ports based on the given identification information.
LAN switch device to be switched and the first LA
N interfaces of the LAN switch device
Connected to one selected port and the lower
One or more devices that send and receive data with additional information
Equipment is connected and accommodated, and given to the upper or lower side
And selecting the devices based on the identification information obtained.
Communication between the selected device and the selected port.
Any number of LAN concentrators (hereinafter referred to as LAN hubs)
Concentrator for voice telephone provided in LAN having
(Hereinafter referred to as TLA)
ing. In other words, one or a plurality of devices
Is one set connected to multiple voice telephones or
A plurality of sets of voice telephone interfaces;
A second LA connected to one of the selection ports of the switch device
N interface and CPU (Central Processing U)
nit; central processing unit) and the CPU
Voice data provided by the voice telephone interface
Data into a fixed length
Into a MAC (Media Access Control) frame,
Whether the MAC frame is the second LAN interface
From the second LAN interface side.
When an AC frame is received, the received MAC
When recovering packetized audio data during a
Based on the identification information in the received MAC frame.
Select a voice telephone interface and select the selected voice
The recovered audio data via a telephone interface
Interface means for providing the
I have. The voice telephone is accommodated and the voice
The second LAN interface and
The configuration is performed via a LAN switch device.

[0005] A second invention relates to the TLA of the first invention.
And the following configuration. That is, the CPU and the front
A third LAN connected to the lower side of the LAN hub
An interface, wherein the CPU is configured to control the third L
The identification information provided via an AN interface
Selecting the voice telephone interface based on
Connected to the selected voice telephone interface
In a configuration with a function to set the voice telephone to the busy state
doing. A third invention is a TL according to the first or second invention.
A has the following configuration. That is, the C
Send / receive to / from the voice telephone interface in conjunction with PU
Analog subscriber line signals to be transmitted
trol Protocol) / Call over IP (Internet Protocol)
Adds means to convert to control protocol and adds analog
It is configured to accommodate a user terminal. Fourth and fifth inventions
In the TLA of the first invention, the following configuration is adopted.
ing. That is, the third L, one of which is connected to the CPU,
An AN interface is provided, and the CPU
Voice data provided via telephone interface
To convert TCP to TCP or UDP / IP packets
And via the third LAN interface
To send and receive the TCP or UDP / IP packet
I am doing well.

In the sixth invention, the first to fourth or fifth
The TLA of the present invention has the following configuration. Immediately
That is, the interface means is provided with the MAC frame
Absorbs variations in voice packet arrival time in the data section inside
A frame having the function of
The transmitted / received audio data is packaged in a frame having the function.
And is mounted on the LAN. Seventh
The invention provides a voice exchange system having the following configuration.
doing. That is, it has a plurality of selection ports, and
LAN for switching connection between the selected ports based on identification information
The switch device and the upper side are connected to the first LAN interface.
One selected port of the LAN switch device depending on the
And has a data communication function on the lower side
Connects and accommodates one or more devices and provides
Between the device selected based on the identification information and the selected port
Any number of LAN hubs, each relaying communications between
A plurality of voice telephones attached to the storage devices;
Alternatively, the TLA of the sixth invention and the LAN switch device
, Each LAN hub, each first LAN interface
Ace, the respective second interfaces, the respective third interfaces
Interface, each TLA and each voice telephone
The identification information for specifying the
The identification information corresponding to the inquiry
And a database means for giving to the equipment.

According to an eighth aspect of the present invention, there are provided a plurality of LAN hubs accommodating devices for performing data communication, the first to fifth or sixth LAN hubs .
A plurality of TLAs of the invention and a plurality of LAs having a plurality of ports.
In a LAN having an N hub and a LAN switch device for switching between the plurality of TLAs, a LAN communication method is as follows. That is, 1 connected to the TLA
Call control for one or more voice telephones,
It is performed by a personal computer or a workstation housed in the AN hub. A ninth aspect of the present invention relates to the eighth aspect of the present invention.
In the AN communication method, when a response from the called personal computer or workstation is not obtained, an incoming call is notified and a response is detected using a control channel signal of the voice telephone interface of the called side. ing. A tenth invention is directed to a plurality of TLAs of the first to fifth or sixth inventions, a plurality of LAN hubs accommodating devices for performing data communication by the LAN, and a plurality of selection hubs. In a LAN provided with the LAN switch device having a port, a LAN communication method is as follows. That is, the routing of the voice packet related to the voice telephone communication between the TLAs is performed by switching connection of the plurality of selected ports of the LAN switch device based on a MAC address in the MAC frame in which the voice packet is set. I am .

According to the first invention, as described above, TLA
Is configured by the CPU and the control means in the TLA.
Voice from the voice telephone interface
The data is transmitted by the CPU and the interface means.
And converted to a fixed-length MAC frame.
MAC frame is transmitted from the second LAN interface to L
It is transmitted to the AN switch device side. Conversely, LAN switch
Switch and the MAC from the second LAN interface side.
If a frame is received, the received MAC frame
The packetized voice data is restored and the identification information
Via the voice telephone interface selected based on
To the voice telephone. That is, if the voice telephone is TLA
Is integrated into the LAN, and calls between voice telephones are
Via the LAN interface and LAN switch device
Done. According to the second invention, the TLA of the first invention
To, separately from the second LAN interface for connecting to the LAN switch device, since there is provided a second 3 LAN interface for transmitting and receiving between the CPU and the LAN hubs within the self-device, as in the eighth invention, the call control for the voice telephone accommodated in TLA, can be performed in equipment such as a personal computer or a work station which houses the said LAN hub. According to the third invention, the TLA converts an analog subscriber line signal transmitted by a general telephone into a TCP / IP signal.
Convert to the above call control protocol. That is, the personal computer or the workstation does not perform call control at the workstation, and the telephone and the TL
It is possible to perform call control on the A side.

According to the fourth and fifth aspects, TLA is
The voice data from the voice telephone is converted into a UDP / IP packet or a TCP / IP packet, and the UDP / IP packet or the TCP / IP packet is transmitted / received via the third LAN interface. It becomes possible to transmit and receive to an external network. According to the sixth aspect, the MAC frame
In the data part during the
Applying a frame that has the function of absorbing
Audio data to be transmitted and received is transmitted in frames with this function.
The TL according to the first to sixth aspects of the present invention
A fluctuation due to voice data packet communication in A
Will be collected. According to the seventh invention, the telephone call between the voice telephones is performed.
The identification information necessary for opening is stored in the database
These are given to the equipment, and the equipment and
Call control is realized by the LAN hub and the like. Each TLA
The voice telephone interface is controlled by the CPU and
The voice data provided by the
Fixed length MAC frame packetized by means
And the MAC frame is converted to the second LAN interface.
Transmitted from the interface to the LAN switch device side. Reverse
The LAN switch device and the second LAN interface
If a MAC frame is received from the
Audio data packetized in the MAC frame
Voice telephone interface selected based on the identification information
Provided to the voice telephone through the interface. That is,
Voice phones are integrated into the LAN by each TLA,
Voice calls between the second LAN interface and
This is performed via a LAN switch device.

[0010] According to the eighth aspect, the call control for one or a plurality of voice telephones accommodated in the TLA is performed by the LA.
This is performed on a personal computer or a workstation housed in the N hub. According to a ninth aspect of the present invention, in the LAN communication method according to the eighth aspect of the present invention, when a response from the called personal computer or workstation is not obtained, the control channel signal of the voice telephone interface of the called side is used. Then, an incoming call is notified and a response is detected. According to the tenth aspect , the routing of the voice packet related to the voice telephone communication between the TLAs is performed by the switching connection of the LAN switch device based on the MAC address in the MAC frame in which the voice packet is set.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a block diagram showing a configuration of a voice exchange system on a LAN according to a first embodiment of the present invention. The voice exchange system on the LAN includes personal computers (PCs) 1, 2, 3, and 4, which are a plurality of information devices, and voice telephones (TELs) 5, 6, 7, and 8 arranged corresponding to the personal computers (PCs). , Two LAN hubs 10, 20 accommodating the personal computers 1-4,
Two TLs that accommodate these voice telephones 5, 6, 7, 8
A30 and A40. The LAN hubs 10 and 20 may house workstations instead of the personal computers 1 to 4 in some cases. PCs 1, 2, 3, 4 are TCP
(UDP) / IP communication device
For example, it has a 10BASE-T communication port.
You. Each of the personal computers 1 and 2 is IEEE802.3.
LAN interface 1a, 2a specified in LA
The personal computers 3 and 4 are connected to the lower side of the N hub 10 , and the personal computers 3 and 4 are connected to the LAN hub 20 by the same LAN interfaces 3a and 4a of IEEE802.3. Each of the voice telephones 5, 6, 7, and 8 has a transmission function and a reception function, respectively, and does not necessarily need a function of transmitting and receiving call control information.

Each of the TLAs 30 and 40 includes a plurality of sets of two-wire digital voice telephone interfaces (hereinafter referred to as voice interfaces) 5a, 6a, 7a and 8a, and an IE.
It has two LAN interfaces 30a, 30b, 40a, and 40b defined in EE802.3, respectively. The voice telephones 5 and 6 are connected to the TLA 30 by voice interfaces 5a and 6a of the TLA 30, respectively. The voice telephones 7 and 8 are connected to the TLA 40 by voice interfaces 7a and 8a of the TLA 40. The upper side of each LAN hub 10 , 20 is IEEE
The first LAN interface 10a defined in E802.3, selection of LAN switch 50 Poe 20a
It is connected to the door.

One of the two LAN interfaces of each of the TLAs 30 and 40 (the second audio
Interfaces 30a and 40a are connected to one selected port of the LAN switch device 50, respectively. Less than,
These interfaces 30a and 40a are connected to LAN-SW
The interface. The other of the two LAN interfaces of each of the TLAs 30 and 40 (the third audio
Interface) 30b and 40b are each LAN hub 1
It is connected to one port on the lower side of 0 and 20, respectively. Hereinafter, these interfaces 30b and 40b are referred to as L
It is called AN-HUB interface. The LAN switch device 50 is an inter-LAN connector having a function of exchanging frames in data communication using a LAN, and performs switch switching based on a MAC address in a LAN frame. The NS device 51 is connected to the LAN switch device 50. This connection is also based on IEEE802.
3 is performed by the LAN interface 51a. The NS device 51 has a client M in the LAN.
Afford to have the database such as an AC address and terminal identification number has been store. PC 1 to be a client of this LAN
4 , the NS device 51 has a function of providing database information in response to an inquiry from the LAN hubs 10 and 20 and the TLAs 30 and 40.

FIG. 2 is a block diagram showing the configuration of the TLA 30 in FIG. The TLA 30 includes a TLA control unit 30A.
And an interface package unit 30B. The TLA control unit 30A includes: a LANC circuit 31 connected to the LAN-SW interface 30a;
And a PF circuit 32 connected to the circuit 31. P
AAL1 circuit 33 is connected to the F circuit 32, the AAL
The HWIF circuit 34 and the PLL circuit 35 are connected to one circuit 33 , and the output side of the PLL circuit 35 is also connected to the HWIF circuit 34. The HWIF circuit 34 is configured to input and output to and from the interface package unit 30B.
I have. Each of the above circuits is an interface means.
The LA control unit 30A further includes a CPU 36 and a LANBO.
An ARD 37 is provided. CPU36 is it the configuration for controlling the LANC circuit 31, PF circuit 32, AAL1 circuit 33, HWIF circuit 34, and LANBOARD37
Ttei Ru. The LANBOARD 37 is connected to the LAN-HUB interface 30b. On the other hand, a TI circuit 38 is provided in the interface package section 30B.
It has only been. A TI circuit 38 is connected to the HWIF circuit 34, and the TI circuit 38 is connected to the audio interface 5 a via a line corresponding unit 39. Interface package unit 30B is that not contain multiple phones other than voice telephone 5. Therefore, although simplified in FIG. 2, the TI circuit 38 and the line interface unit 39, is provided corresponding to the plurality of voice telephone. Each TI circuit 3
8 also, that has become the configuration under the control of the CPU36. T
The internal configuration of the LA 40 is the same as that of the TLA 30.

FIG. 3 is a diagram for explaining the MAC frame format used in FIG. In this embodiment, a MA C frame as a frame format. MAC
The frame is composed of a preamble (PA) and a SF as shown in FIG.
D (Start Frame Delimiter), Hardware DA (Dest
ination Adress), Hardware SA (SourceAdres)
s), ETYPE, data section, and frame check sequence (FCS). In the voice switching system of FIG. 1, voice data is packetized, and the voice packet frame includes an ATM in the data portion of the MAC frame.
(Asynchronous Transfer Mode) AAL type 1 (J
T- I . 363) is applied. ATM / AA
Frame L type 1, an ATM header, a field of SAPDU-H which have a fluctuation absorbing function, and a field of the speech data. The function of each unit in the TLA 30 will be described with reference to FIG.

The LANC circuit 31 generates and decomposes a MAC frame. LANBOARD37
Is an IEEE 802.3 LAN interface for the CPU 36 to communicate control information with other personal computers and the like.
The one in which to configure. The PF circuit 32 deletes the MAC address and the like from the MAC frame received from the LANC circuit 31, extracts the ATM / AAL type 1 frame shown in FIG. Also,
The PF circuit 32 is an ATM edited by the AAL1 circuit 33.
A function of adding a MAC address designated by the CPU 36, the length of transmission data, and a control bit (CTL) to the AAL type 1 frame and giving the frame to the LANC circuit 31. The AAL1 circuit 33 converts the audio data received by the time-division multiplex from the interface package unit 30B into an ATM / AAL type 1 frame, gives the frame to the PF circuit 32, and outputs
The voice packet of TM / AAL type 1 is converted into a time division multiplexed interface and transferred to the interface package unit 30B. The AAL1 circuit 33 performs a function of absorbing a fluctuation that is a difference in arrival time of a voice packet by the asynchronous interface .

The HWIF circuit 34 has a PL for interfacing with the interface package unit 30B.
A synchronization signal for time division multiplex transmission is generated using the L circuit 35, and voice and control data are transmitted and received with the interface package unit 30B by time division multiplex. The HWIF circuit 34 holds the download data from the CPU 36, sends out a silent pattern, howla, or tone ringer to the voice telephone, and performs a PAD on the download data received from the personal computer or the like.
It has a function to make adjustments. The TI circuit 38 in the interface package unit 30B performs frame format conversion on the line based on the synchronization signal from the HWIF circuit 34 , and transmits and receives voice and control data to and from the HWIF circuit 34 by time division multiplexing. is there.

FIG. 4 is a diagram showing the operation sequence of FIG. 1, showing the transmission direction and the processing period. The transmission direction is given the number of the interface in FIG. Referring to FIG. 4, a voice telephone 5 attached to the personal computer 1 to a voice telephone 8 attached to the personal computer 4 will be described.
The operation when making a call to, talking on, and disconnecting from a telephone will be described.
Here, a MAC address, which is identification information, is assigned to each of the LAN-HUB interfaces 30b and 40b and each of the LAN-SW interfaces 30a and 40a of each of the TLAs 30 and 40. , VPI in ATM header in FIG.
/ VCI (Virtual Path Identity / Virtual Channel
Identity) used in the number or CTL bits in the figure,
It is specified by the number which is the identification information of the telephone. PC or workstations 1-4 and N
It is assumed that a MAC address that does not require a special condition is also assigned to the S device 51. In the present embodiment, the interfaces 5a and 6 shown in FIG.
Communication on interfaces other than a, 30a, 40a, 7a, and 8a uses, for example, a TCP / IP communication protocol.

First, call control for communication is performed. The user of the voice telephone 5, with respect to NS device 51 from the personal computer 1, information of the personal computer 4 and (MAC address of the personal computer 4, I P A containing address), information on the voice telephone 8 (T
It inquires about the MAC address of the LAN-HUB interface 40b and the LAN-SW interface 40a of the LA 40 and the number of the voice telephone 8 and receives these information ((A) in FIG. 4). This query includes:
The interfaces 1a, 10a, and 51a via the LAN hub 10 and the LAN switch device 50 are used.
The personal computer 1 receiving the information sends the personal computer 4
It transmits call setup request (SET-UP) information via the interfaces 1a, 10a, 20a, and 4a. The call setting request information includes the MAC address of the LAN-SW interface 30a of the TLA 30 and the voice telephone 5 of the transmission source.
Including the number of.

The personal computer 4 which has received the call setting request SET-UP information sets this as an incoming call request, and instructs the personal computer 1 to return to the interface 4a, 20 in the reverse of the call setting request.
a, 10a, and 1a, using the calling information (ALE)
RT). When the personal computer 4 detects a response made by the user of the personal computer 4 by keyboard input or the like,
The response (CONN) information is transmitted to the personal computer 1.
This transmission also uses the same interfaces 4a, 20a, 10a, and 1a as the calling information. Further, the personal computer 4 transmits the number information of the voice telephone 8, the MAC address of the TLA 30 and the voice telephone 5 to the LAN-HUB interface 40 b of the TLA 40 for routing the voice data in the direction of the voice telephone 8 → the voice telephone 5. to send and number information. Since the transmission here is also performed via the LAN switch device 50 and the LAN hub 20, the interfaces 4a, 20a and 40b are used. These information are stored in LANBO in TLA40.
It is provided to the CPU 36 via the ARD 37.

The TLA 40 that has received the information adds the MAC address of the LAN-SW interface 30a of the TLA 30 and the number of the voice telephone 5 to the voice data corresponding to the number of the voice telephone 8, and transmits the LAN-data in the format shown in FIG. The data is sent to the LAN switch device 50 via the SW interface 40a. On the other hand, the personal computer 1 having received the response from the personal computer 4
The voice telephone 5 is connected to the N-HUB interface 30b.
Number information of the voice telephone 5 for routing voice data in the direction of the voice telephone 8, MA of the TLA 40
The C address and the number information of the voice telephone 8 are transmitted via the interface 1a and the LAN hub 10.
These information are stored in the LANBOARD 37 in the TLA 30.
Is given to the CPU 36 via the. Upon receiving the information, the TLA 30 adds the MAC address of the LAN-SW interface 40a of the TLA 40 and the number of the voice telephone 8 to the voice data corresponding to the number of the voice telephone 5, and the LAN switch device 50 in the format shown in FIG. ((B) in FIG. 4).

As described above, the interface 5
The routing of the voice packet via the a, 30a, 40a, and 8a is completed, and the voice telephone 5 and the voice telephone 8 enter a busy state ((C) in FIG. 4). When the user of the voice telephone 5 tries to end the call, the disconnection (DISC) information is transmitted from the personal computer 1 to the interfaces 1a, 10a,
20a, the co the via 4a is sent to the PC 4, T
The link release is instructed to the LA 30. An instruction to the TLA 30 is given to the LAN switch device 50 via the interfaces 1a and 10a, and is given from the LAN switch device 50 to the TLA 30 via the interfaces 10a and 30b. Upon receiving the link release instruction, the TLA 30 stops transmitting the voice packet corresponding to the number of the voice telephone 8, and outputs a silent pattern to the HWIF circuit 34 in the TLA 30 in the downstream voice data of the voice telephone 8.
Send more. On the other hand, the personal computer 4 having received the disconnection information instructs the TLA 40 to release the link. The subsequent operation is the same as that of the TLA 30 ((D) in FIG. 4).

Here, the configuration of the audio data frame (in-channel data) will be described. Audio signal in FIG.
The interface package unit 30B for interfacing with the talker is connected to a plurality of (for example, 32 lines) voice telephones, and the frame format on the line has a B1 channel and a D channel. Audio data is B1
On the channel, other control information is transmitted and received by the D channel. The TI circuit 38 of the interface package unit 30B uses the synchronization signal from the HWIF circuit 34 to
The frame format on the line and the time division multiplex interface (hereinafter , referred to as highway) are converted. HWI
The F circuit 34 has AAL1 for the downlink voice channel.
Or relays and or silence pattern, howler, selects in accordance with an instruction or the CPU36 transmits a ringer tone data. The AAL1 circuit 33 converts the audio data transmitted from the interface package unit 30B via the HWIF circuit 34 into an ATM / AAL1 frame (JT-I.36).
Convert to 3). At this time, the conversion is performed so as to absorb the fluctuation of the arrival time difference of the voice packet in the asynchronous network.
AAL1 being packetized in the circuit section 33 is a range that is shown by in FIG. 3 and (i).

The PF circuit 32 based <br/> Hazuki to an instruction from the CPU 36, with respect to packetized voice data AAL1 circuit 33, the MAC frame of IEEE802.3 specified at call origination DA, SA, ETYPE and CTL
A bit is added and transmitted to the LANC circuit 31. The range shown in (ii) in FIG. 3 is the range that is packetized by the PF circuit 32. LANC circuit 31 further includes PA, SF
D, FCS is added, and the complete IEEE of (iii) in FIG. 3 is added.
Performs MAC frame of 802.3, and transmits to the LAN switch 50. As described above, the first embodiment has the following advantages.

(1) A TLA3 is connected to a LAN having a LAN switch device 50 and LAN hubs 10 and 20 accommodating devices such as personal computers 1 to 4 or a workstation.
By adding 0 and 40, voice communication is possible without requiring a PBX. (2) voice telephone 5-8, since the information corresponding to the call control is controlled by <br/> computer 1-4, it is unnecessary to select signaling for ten-key, greatly simplifies the construction of the telephone it can. (3) The voice packet frame that is packetized and transmitted on the LAN uses the ATM / AAL type 1 frame configuration of FIG. 3 assigned to the data portion of the MAC frame. Therefore, for example, compared to assign at UDP / IP frame overhead is small voice packet, co the throughput is increased, the delay time is reduced for performing protocol processing easy packetization. In addition, routing outside the device can be performed at the MAC frame level by the LAN switch device 50 without using a router, and the delay time required for routing is small, and the voice quality is degraded due to delay which is particularly problematic in voice communication. Less is. In addition, the voice frame assigned to the data portion of the MAC frame absorbs the fluctuation caused by ATM / AAL1, and the fluctuation of the voice packet arrival time in the congestion state of the LAN switch device 50 can be absorbed. Is guaranteed.

(4) LAN-SW interface 40a independently of LAN-HUB interface 40b
By providing, there is no competition with data from other personal computers or workstations, so that the number of voice telephones accommodated can be easily calculated for each device. For example, in the case of full duplex 10BASE-T, if the execution throughput to the line is 6.144M / S, the audio data
With 64 Kb / s per channel , accommodation of 94 lines per interface can be guaranteed. (5) TLA3 accommodated in LAN switch device 50
0,40 ... can respond to a simple increase in capacity to continue to add more, corresponding to the scale expansion, it is easy compared to the PBX with a limit on the maximum capacity of the receiving line.

Second Embodiment FIG. 5 is a sequence diagram of a LAN communication method according to a second embodiment of the present invention. The first embodiment has a problem that the voice telephone 8 cannot be called when the power of the personal computer 4 is turned off . That is, in the first embodiment, the call control relating to the communication between the voice telephones is performed by the personal computer 1,
To be done by 4, the power supply of the personal computer 4 of the called party
It cannot be called if it is turned off . The second embodiment is an LA that solves this problem.
N communication method. In FIG. 5, only the part represented by (B2) is different from FIG. 4 of the first embodiment,
Other parts represented by (A), (C), and (D) are the same as those in the first embodiment. Only the part (B2) is shown below. Unless otherwise indicated, “information” described below has the same contents as in the first embodiment.

When the personal computer 1 receives the information of the voice telephone 8 in accordance with the sequence (A) in FIG. 5, the personal computer 1 sends a call setting request (SET-UP) information to the personal computer 4.
To start the software timer T0 (CONN waiting timer over) to co. When the power of the personal computer 4 is off, no response (ALERT, CONN) to the call setting request is returned. When the timer T0 times out (TO), the personal computer 1 sends a call setting request (HS-S) to the TLA 40.
ET-UP) information. The information transmitted is TL
MAC of LAN-SW interface 40a of A40
The interface 1 includes an address, the number of the voice telephone 5, the number of the voice telephone 8 to be received, and necessary addresses (MAC, IP, etc.) on the LAN of the personal computer 1.
a, 10a, and 20a to the LAN hub 20 and further through the interface 40b to the TLA4.
0 is given. The TLA 40 that has received the call setting request (HS-SET-UP) recognizes this as an incoming call to the voice telephone 8 and transmits a ringer ON signal to the voice telephone 8 through the downlink control channel of the voice interface 8a. At the same time, the calling information (HS-ALERT) is returned to the personal computer 1. That is, it notifies that the voice telephone 8 is calling. The return of this information is performed via the interface 40b, the LAN hub 20, and the interfaces 20a, 10a, 1a.

On the other hand , the voice telephone 8 that has received the ringer ON signal sounds a beep sound and notifies the user that there is an incoming call. When the user of the voice telephone 8 goes off-hook, the voice telephone 8 notifies the TLA 40 of the off-hook through the uplink control channel of the voice interface 8a. TLA 40 detecting off-hook of voice telephone 8
Transmits response (HS-CONN) information to the personal computer 1 and adds the MAC address of the LAN-SW interface 30a of the TLA 30 and the number of the voice telephone 5 to the voice data corresponding to the number of the voice telephone 8, 3 to the LAN switch device 50. On the other hand, the personal computer 1 having received the response information transmits the number of the voice telephone 5, the MAC address of the TLA 40, and the number information of the voice telephone 8 for routing the voice data in the direction of the voice telephone 5 → the voice telephone 8.
30b to LAN-HUB interface of TLA30
Send to

Upon receipt of the information, the TLA 30 adds the L of the TLA 40 to the voice data corresponding to the number of the voice telephone 5.
MAC address of the AN-SW interface 40a,
The number of the voice telephone 8 is added and transmitted to the LAN switch device 50 in the format shown in FIG. As described above, in the second embodiment, even when the power of the personal computer on the receiving side is turned off, the incoming call is notified by using the control channel signal of the voice telephone interface 8a on the receiving side. Since the response is detected, it has the same advantages as the first embodiment, and it is possible to call the voice telephone 8 or the like even when the personal computer is turned off. And voice communication is possible at any time.

Third Embodiment FIG. 6 is a block diagram showing the configuration of a TLA according to a third embodiment of the present invention. In the first and second embodiments, the configuration of the voice telephone can be simplified without using a numeric keypad, but does not accommodate a general analog subscriber telephone.
In the third embodiment, a general analog telephone is accommodated in a LAN. This TLA is the same as the TL shown in FIG.
An A control unit 30A and an interface package 60 different from FIG. 2 are provided. The interface from the interface package 60 to the outside is a general analog subscriber line interface, such as a general analog telephone, a G3FAX, etc., which can be connected to the interface.
Connect a terminal that has been widely used.

The interface package 60 is a so-called BORSC necessary for the analog subscriber circuit of the exchange.
HT function, power supply, ringer, dial pulse (PB
/ DP) Performs monitoring and the like. Interface Package 6
0 transmits / receives information related to call control such as a selection signal reception result to / from the CPU 36 of the TLA control unit 30A. CPU36
Converts the information relating to call control are transmitted and received and the interface package 60 to the call control procedures on the LAN, such as TCP / IP (first embodiment equivalent procedure). Eventually, the interface package 60 and the CPU 36 constitute a function of converting signals related to analog subscriber line call control, for example, an off-hook signal, a dial signal, a ringer signal, and an on-hook signal into a call control protocol on the LAN. That is, the CPU 36 has functions equivalent to the functions of the personal computers 1 to 4 described in the first and second embodiments. Therefore, in the third embodiment, a general analog subscriber can be accommodated in a voice telephone on a LAN, and a general-purpose terminal, an analog telephone, a G3 FAX, and the like can be accommodated.

The TLA of Fourth Embodiment The fourth embodiment, FIG. 2 or to TLA30,40 the configuration shown in FIG. 6, the accommodated plurality of voice data from the voice telephone UDP / IP (or TCP / I
P) The function of converting the packet and the packet
And a function of transmitting and receiving via the HUB interfaces 30b and 40b. When such a function is provided, for example, the TLA control unit 30 in the TLA 30
A converts the audio data obtained from the interface package 30B or 60 into UDP / IP (or TCP / I
The packet is converted into a packet based on the communication protocol P). Information related to call control is transmitted and received using a TCP / IP communication protocol. UDP / IP obtained by this process
(Or TCP / IP) packet is provided to the LAN-HUB interface 30b. If, for example, a router is connected to the LAN-HUB interface 30b, the packet is transmitted to the external network via the router. As described above, in the fourth embodiment, a device that performs routing by an IP address such as a router is connected to a LAN-HUB interface, so that a voice telephone on a LAN can be connected via an IP network (for example, the Internet). Communication from 5 to 8 becomes possible.

Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications. (1) In the voice exchange system of FIG. 1, the NS device 51 is connected to the LAN switch device 50,
The present invention is applicable even when connected to the AN hubs 10 and 20. (2) The NS device 51 of FIG. 1 can be built in the TLA 30, 40. (3) Each TLA 30, 40 and each LAN hub 10, 20
Although the TLA 30 and the TLA 40 are configured as separate devices, the TLA 30 and the LAN hub 20 may be integrated into a single device. FIG. 7 is a diagram showing a modification of FIG.
A device integrating the N hub 20 is shown. By doing so, the integrated device and the personal computer (P
C) Wiring between the 4 and the voice telephone (TEL) 8 can be simplified. A pair of voice telephones and a personal computer can be connected with a connector (for example , RJ-45) provided on an integrated device with one 8-core modular cord, which simplifies the operation. 8
Six of the cores are used for communication. In addition, in a state where a voice telephone is not connected to this integrated device, a simple LA
Functions as an N hub.

(4) Connecting a plurality of TLAs 30, 40 to a LAN
However, even when only one TLA is provided in the LAN, the same effect as in the above embodiment can be obtained. In this case, the LAN-SW interface of one TLA is used in a loopback connection (the LAN switch device 50).
Becomes unnecessary). (5) FIG. 8 is a block diagram showing a TLA to which functions have been added. By adding a voice compression function and a facsimile transmission / reception function in addition to the function of the fourth embodiment,
TLA can be used more effectively. In FIG. 8, TLA3
0, the input / output unit on the LAN-HUB interface side
A FAX modem unit 70 and a voice compression unit 80 are provided. F
AX modem unit 70, which performs conversion between analog and digital Le, allowing transmission and reception with respect to the external network of G3FAX via routers. Audio compression unit 80
Has a function of compressing audio data.
It has a variable compression rate of kb / s. The provision of the audio compression unit 80 enables transmission and reception of compressed audio data to and from an external network.

[0036]

As described in detail above, the first invention
According to the second LAN interface and voice telephone
Interface, CPU and interface
And steps in the TLA, via voice telephone interface
The voice data on the voice telephone side is packetized and has a fixed length.
And converts this MAC frame to the second
LAN interface to LAN switch device side
To the LAN switch device and the second LAN interface.
When a MAC frame is received from the interface side
Is the voice packetized in the received MAC frame
Restores data and selects voice call based on identity
To the voice telephone via the phone interface
I'm trying. Therefore, the voice telephone is
And all calls between voice telephones are
Via AN interface and LAN switch device
Since it can be performed, the PBX or the like that has been required conventionally becomes unnecessary.
In addition, since fixed-length MAC frames are used,
The throughput does not deteriorate. According to the second invention, the first
Connecting the LAN switch device to the TLA of the second invention
Independent of the LAN interface of the
Since the third LAN interface for transmitting and receiving between the U and the LAN hub is provided, call control can be performed by devices such as a personal computer and a workstation, so that the structure of the voice telephone can be simplified. . In addition, there is no competition with data from other personal computers or workstations, and the number of voice telephones accommodated can be easily calculated for each device.

According to the third aspect, the TLA of the first and second aspects is provided with a function of converting an analog subscriber line signal into a call control protocol on TCP / IP. It is possible to accommodate a user terminal. Therefore, accommodation of G3 FAX or the like connected to the analog subscriber line interface is also possible. 4th and 5th
According to the invention of the first aspect, the third LAN is connected to the TLA of the first aspect.
An interface is provided, and voice data from a plurality of stored voice telephones can be transmitted as UDP / IP packets or TCP /
Since a function of converting the packet into an IP packet and a function of transmitting and receiving the UDP / IP packet or the TCP / IP packet via the third LAN interface are provided, voice communication with the outside of the LAN becomes possible. 6th departure
According to the description, a voice packet is added to the data portion in the MAC frame.
Frame with a function to absorb variations in arrival time
The voice data transmitted and received by the voice telephone
Into a frame with a frame and put it on the LAN
Therefore, for example, as in the first to fourth or fifth inventions,
In the case of TLA that does not use PBX,
The problem of packet arrival time fluctuations
Thus, natural conversation on the LAN can be guaranteed.

According to the seventh aspect, the first to the fifth or the fifth
6. The TLA and LAN switch device according to the sixth aspect of the invention, and an arbitrary number of L
AN hub, a plurality of voice telephones attached to the equipment,
All voice telephones with database means
Is integrated into the LAN, and all calls between voice telephones are
Via the LAN interface and LAN switch device
Voice exchange system that does not require PBX etc.
Can be configured. According to the eighth invention, the call control for one or a plurality of voice telephones accommodated in the TLA is performed by the LAN.
Since the operation is performed by a personal computer or a workstation accommodated in the hub, the structure of the voice telephone can be simplified, for example, dialing can be omitted . According to the ninth invention, the incoming call is notified and the response is detected by using the control channel signal of the voice telephone interface of the called side. Therefore, the power supply of the personal computer or the workstation for performing the call control of the called side is Voice communication can be performed even when it is off. No.
According to the tenth aspect , the routing of the voice packet related to the voice telephone communication between the TLAs is performed by the switching connection of the LAN switch device based on the MAC address in the MAC frame in which the voice packet is set. compared to the PBX with limited maximum capacity, it can easily adapt to the capacity.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a voice exchange system on a LAN according to a first embodiment of the present invention.

FIG. 2 is a configuration block diagram showing a TLA 30 in FIG.

FIG. 3 is a diagram illustrating a MAC frame format used in FIG. 1;

FIG. 4 is a diagram showing an operation sequence of FIG. 1;

FIG. 5 is a sequence diagram of a LAN communication method according to a second embodiment of the present invention.

FIG. 6 is a configuration block diagram of a TLA according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a modification of FIG. 1;

FIG. 8 is a block diagram showing a TLA to which a function is added.

[Explanation of symbols]

 1-4 personal computer 5-8 voice telephone 10,20 LAN hub 30,40 TLA 50 LAN switch device 51 NS device 1a-4a interface 5a-8a voice interface 10a-40a LAN-SW interface 30b, 40b LAN-HUB interface

Continuation of front page (56) References JP-A-9-224093 (JP, A) JP-A-9-200347 (JP, A) JP-A-6-191324 (JP, A) JP-A-9-162988 (JP) JP-A 8-163275 (JP, A) JP-A 8-139810 (JP, A) JP-A 8-51485 (JP, A) JP-A 8-32652 (JP, A) 7-147612 (JP, A) JP-A-4-310049 (JP, A) JP-A-3-109847 (JP, A) JP-A-1-158850 (JP, A) Oki Electric R & D Vol. 64 No. 2 (No. 174), April 1997, Tomokazu Konishi et al. "Integrated Voice / Data Communication in a LAN Environment (VOICEHUB)", pages. 27-32 OKI Technical Review, Vol. 63 Jul. 1997, K ONISHI T et al, "Voice and Data Integrated Communications on LAN (VOICEHUB)", pages. 5-10 ISS '97, XVI World Telecom Congress Processings (Sep. 21-26, 1997), Interactive Session 4-Networks and Services, KONI SHI T et al. "INTER NET ACCESS GATEWAY SYSTEM FOR VOICE COMMUNICATION", pages es. 53-58 NTT Technical Journal Vol. 8 No. 12, Dec. 1996, Takeo Hayashi et al. "To CTI production for office", pages es. 96-97 Hitachi Review, Vol. 79 No. 6, 1997, Osamu Matsushima et al. “System technology for linking and integrating personal computers (computer networks) with telephones and facsimile machines (communications networks)”, pages. 15-18 BS1200 Internet Voice Gateway Catalog (Oki Electric Industry Co., Ltd.) Voice Internet Access Equipment B S1100 COMSN Catalog (Oki Electric Industry Co., Ltd.) Computer Communications, Vol. 12 No. 5, Oct. 1989, Dunlop. J et al, "Techniques for the integration of Packet voice and data on IEEE 802.3 LANs", pages. 273-280 ELECTRONIC DESIGN, Vol. 42 No. 22, OCTOBER 25, 1994, Goldberg L. et al. et al, "CTI: COMPUTER / PHONE FUSION AT LAN'S EDGE", pages es. 77-94 (58) Fields surveyed (Int. Cl. ⁶ , DB name) H04L 12/28 H04M 3/00 H04M 11/00 INSPEC (DIALOG) JICST file (JOIS) WPI (DIALOG)

Claims (10)

(57) [Claims] 1. A system having a plurality of selection ports, wherein
LAN switch for switching connection between the selected ports based on different information
Switch device, and the upper side is connected to the L by the first LAN interface.
When connected to one selected port of the AN switch device,
The lower side transmits and receives data with the identification information 1
One or more devices are connected and accommodated, and
Based on the identification information given to the lower side,
Communication between the selected device and the selected port
There a and any number of LAN line concentrator that relays respectively, in line concentrators voice telephone provided in LAN having
And one or a plurality of audio devices attached to the plurality of devices.
One or more sets of audio telephones, each connected to a telephone
Connected to the talker interface and one of the selected ports of the LAN switch device.
A second LAN interface, a CPU, and the voice telephone interface controlled by the CPU.
Packetize the audio data provided by the
Convert to fixed length MAC frame with the identification information
And transmits the MAC frame to the second LAN interface.
From the second LAN interface side
If the MAC frame is received, the received MA
Restores voice data packetized during C frame
Together with the identification information in the received MAC frame.
Select the voice telephone interface, and select the selected
Via the voice telephone interface.
Interface means for providing data to the voice telephone;
A line concentrator for a voice telephone, comprising: 2. The CPU and a lower part of the LAN concentrator.
The third LAN interface connected between the
And the CPU is connected via the third LAN interface.
Based on the identification information given by
Select the centers face, the selected audio phone interface
The voice telephone connected to the
2. The apparatus according to claim 1, further comprising a setting function.
Concentrator for voice telephones. 3. The voice telephone in conjunction with the CPU.
Analog subscriber line signals to and from the
Means for converting to a call control protocol on P / IP,
The feature is to accommodate analog subscriber terminals.
The line concentrator for a voice telephone according to claim 1 or 2. 4. A third L, one of which is connected to the CPU.
An AN interface is provided, and the CPU communicates via the voice telephone interface.
The given TCP / IP packet
It has a function to convert to packet or UDP / IP packet.
And via the third LAN interface
Send or receive the protocol TCP or UDP / IP packet
2. The voice according to claim 1, wherein the voice is transmitted.
Concentrator for telephones. 5. The other of the third LAN interface
The third LAN interface is connected to the LAN
Router selectively connected to the outside or the LAN concentrator
5. The voice telephone according to claim 4, wherein
Line concentrator. 6. The MA unit according to claim 1 , wherein
Variation of voice packet arrival time in data part of C frame
Apply a frame that has the function of absorbing
Voice data transmitted and received by voice telephones is
And put it on the LAN
The voice according to claim 1, 2, 3, 4, or 5, wherein
Concentrator for telephones. 7. A device having a plurality of selection ports and provided with a given
LAN switch for switching connection between the selected ports based on different information
Switch device, and the upper side is connected to the L by the first LAN interface.
When connected to one selected port of the AN switch device,
The lower side transmits and receives data with the identification information 1
One or more devices are connected and accommodated, and given
Between the device selected based on different information and the selected port
6. An audio telephone telephone concentrator according to claim 1, 2, 3, 4, or 5 , wherein an arbitrary number of LAN concentrators for relaying the communication of each other, and a plurality of audio telephones provided in parallel with the equipment.
Device, the LAN switch device, the LAN concentrators,
Each first LAN interface, each second interface
-Face, each third interface, each sound
The line concentrator for voice telephones and the voice telephones
The identification information to be specified is stored and the
The identification information corresponding to the request is sent to the device that made the inquiry.
Database means for providing
Voice exchange system. 8. A plurality of devices accommodating devices for data communication.
And a LAN concentrator according to claim 1, 2, 3, 4, 5, or
6. A plurality of concentrators for voice telephones according to 6.
And the plurality of LAN concentrators and the plurality of voice telephones.
LAN switch device for switching connection between
In LAN with, one or more contained in the voice phone use concentrator
Call control for one voice telephone to the LAN concentrator
Housed personal computer or workstation
A LAN communication method characterized in that the communication is performed in an application. 9. The personal computer or the personal computer on the called side.
Or if a response from the workstation cannot be obtained
Control of the voice telephone interface of the called side
Notify incoming call and detect response using channel signal
9. The LAN communication method according to claim 8, wherein
Law. 10. The method according to claim 1, 2, 3, 4, 5, or 6.
And a plurality of concentrators for voice telephones
LAN concentrators containing devices for data communication
Device and the LAN switch having a plurality of selection ports
And a voice telephone communication between the voice telephone concentrators in a LAN provided with a telephone device.
The routing of the voice packet is set by the voice packet.
Based on the MAC address in the MAC frame
Disconnecting the selected ports of the LAN switch device.
A communication method for a LAN, characterized in that the communication is performed by a reconnection.