JPH09298782A - Analog line multiplexer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct an analog frame relay network at the low cost of communication by converting a digital signal connectable to a digital frame relay network to an analog signal and inversely converting that signal. SOLUTION: A signal from a telephone 9a, facsimile 9b, data terminal 7a or personal computer 7b is connected to a packet processor 13 after required processing. That output is connected to a call processor 15 and a frame relay processor 16 and by the call processor 15, the processed packets are transmitted to the frame relay processor 16 according to the priority. By the frame relay processor 16, packeted data are inversely transformed to a frame relay format, congestion control is performed and these data are outputted as the digital signals connectable to the digital frame relay network as they are, converted or inversely converted to analog signals and outputted while being branched to a MODEM 17 connectable to a 2W analog privately leased line or a public telephone line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit multiplexer in an information network in a company.

[0002]

2. Description of the Related Art Conventionally, as a communication method between computers or a communication method between telephones and facsimiles in a tail circuit (branch system) of an information network in a company,
As shown in the block diagram of FIG. 3 showing an example of a conventional information network construction using a dedicated line, when connecting the host computer 4 and the data terminal 7a or when connecting the server 5 to the LAN 8 and the personal computer 7b, The 4W analog leased line 11 or the digital leased line was connected via the modem 10 respectively. Further, when a large number of telephones 9a and facsimiles 9b are connected, the PBX 6 is relayed to connect the 4W analog dedicated line 11 or the public telephone line 3.

[0003]

As described above, a dedicated line is generally connected point-to-point between two points, and if the number of connected lines increases, the communication cost will increase in proportion to it. . In this case, the number of lines can be reduced by using the multiplexer, but the equipment cost will increase. In the case of a long distance, the burden is not so great, but in the case of a short distance, it is a burden and not practical. Further, the multiplexer cannot flexibly cope with the change of the line type. Moreover, the communication speed is low for the code item of the general-purpose service. The present invention has been invented to solve such a problem.

[0004]

The structure of the present invention will be described based on the block diagram showing the structure of the analog line multiplexer of the present invention in FIG. The analog voice signal from the telephone 9a is code-converted and inverse-converted by the voice compression encoder 12 and connected to the packet processor 13. The signal from the facsimile 9b is code-converted and inverse-converted by the facsimile signal converter 14 and connected to the packet processor 13. The data signal from the data terminal 7a or the personal computer 7b is the packet processing device 13 as it is.
Connected to. The device performs packet conversion and data processing on these signals, and is connected to the call processing device 15 and the frame relay processing device 16. The call processing device 15 transmits the processed packets to the frame relay processing device 16 according to the priority order. In the frame relay processing device 16, the packetized data is inversely converted into a frame relay format and congestion control is performed. The signal from the frame relay processing device 16 is output as it is as a digital signal connectable to the digital frame relay network, and the digital signal is converted into an analog signal and inverse conversion to the 2W analog dedicated line 2 or public telephone line 3. The data is branched and output to the connectable modem 17.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described based on a block diagram showing an example of an information network construction by the analog line multiplexer of the present invention in FIG. A data line of a LAN 8 is connected to the analog line multiplexer 1 on the host side via a host computer 4 and a server 5, and a large number of telephones 9a and facsimiles 9b are connected by relaying the PBX 6. The data line of the data terminal 7a and the personal computer 7b is connected to the analog line multiplexer 1 on the terminal side, and a large number of telephones 9a and facsimiles 9b are connected by relaying the PBX 6. An analog frame relay network is constructed by connecting the 2W analog dedicated line 2 or the public telephone line 3 between these two points. Also, a digital frame relay network is constructed by connecting the digital dedicated line 18.

[0006]

1 is a block diagram showing a configuration of an analog line multiplexer of the present invention in FIG. 1 and a block diagram showing an example of an information network construction by the analog line multiplexer of the present invention in FIG. It will be described in detail based on this.

In FIG. 1, an analog audio signal from the telephone 9a is an ACELP (Algebraic Code).
Excited Linear Predictio
The audio compression encoding device 12 according to the n) system performs code conversion and inverse conversion at a low bit rate, and is connected to the packet processing device 13. The signal from the facsimile 9b is code-converted and inverse-converted by the facsimile signal converter 14 and is connected to the packet processor 13. Data signals from the data terminal 7a and the personal computer 7b are directly connected to the packet processing device 13. The packet processing device 13 converts bit data into a fixed packet, detects the presence or absence of data, and performs control such as not transmitting a packet when there is no input data.
It is connected to the call processing device 15 and the frame relay processing device 16. The call processing device 15 transmits the processed packets to the frame relay processing device 16 according to the priority order. The frame relay processing device 16 reversely converts the packetized data into a frame relay format and performs congestion control. The signal from the frame relay processing device 16 is output as it is as a digital signal connectable to a digital frame relay network, and the digital signal is converted into an analog signal and inverse conversion to 2W.
The data is branched and output to the modem 17 which can be connected to the analog dedicated line 2 or the public telephone line 3. These devices are built in one case, and the analog line multiplexer 1
And

This analog line multiplexer 1 has two different
A data line of LAN 8 is connected to the analog line multiplexer 1 on the host side through the host computer 4 and the server 5, and a large number of telephones 9a and facsimiles 9b are relayed through the PBX 6. Connected. The data line of the data terminal 7a and the personal computer 7b is connected to the analog line multiplexer 1 on the terminal side, and a large number of telephones 9a and facsimiles 9b are connected by relaying the PBX 6. An analog frame relay network capable of multiplex transmission of data, voice and facsimile images is constructed by connecting a 2W analog leased line 2 or a public telephone line 3 having a low communication cost between these two points.

Further, since it has the digital frame relay output as described above, it can be relayed to other digital frame relay networks or analog frame relay networks in multiple stages by one-link transition.

Further, since the digital frame relay output is provided as described above even when the traffic volume increases, it is possible to easily shift from the analog frame relay network to the digital frame relay network.

[0011]

As described above, by using the analog line multiplexer of the present invention, a 2W analog line or public telephone line whose communication cost is low in a tail circuit (branch system) of an information network in a company. As a result, it is possible to construct an analog frame relay network capable of multiplex transmission of data, voice and facsimile images. Moreover, since it is a frame relay network, data communication can be performed at a higher speed than code items for general-purpose services.

Since it also has a digital frame relay output, it can be relayed to other digital frame relay networks and analog frame relay networks in multiple stages, and even when the traffic volume increases, it is possible to easily shift to the digital frame relay network. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an analog line multiplexer of the present invention.

FIG. 2 is a block diagram showing an example of an information network construction by the analog line multiplexer of the present invention.

FIG. 3 is a block diagram showing an example of a conventional information network construction using a dedicated line.

[Explanation of symbols]

1 analog line multiplexer 2 2W analog dedicated line 3 public telephone line 4 host computer 5 server 6 PBX (Private Branch Exc)
change) 7a Data terminal 7b Personal computer 8 LAN (Local Area Network)
k) 9a telephone 9b facsimile (FAX) 10 modem 11 4W analog leased line 12 voice compression encoder 13 packet processor 14 facsimile signal converter 15 call processor 16 frame relay processor 17 modem 18 digital leased line

Claims (3)

[Claims] 1. A voice compression encoding device (12) for performing code conversion and inverse conversion of an analog voice signal from a telephone (9a) in a multiplexing device in a tail circuit (branch system) of an information network in a company, A facsimile signal conversion device (14) for performing code conversion and inverse conversion of a signal from a facsimile (9b), and packet conversion and data control of the converted signal and a signal from a data terminal (7a) or a personal computer (7b). A packet processing device (13), a call processing device (15) for transmitting packets to a frame relay processing device (16) according to a priority order, and a frame relay for performing reverse conversion and congestion control of packets from the device into a frame relay format. A processing device (16) and converting a digital signal from the device into an analog signal and 2W with low communication cost between devices that have a modem (17) that performs reverse conversion in a single housing
An analog line multiplexer, which is capable of constructing an analog frame relay network capable of multiplex transmission of data, voice and facsimile images by connecting an analog leased line (2) or a public telephone line (3). 2. The analog line multiplexer according to claim 1, wherein multi-stage relay can be performed from the analog frame relay network to the digital frame relay network by a one-link transition. 3. The analog line multiplexer according to claim 1, wherein the analog frame relay network can be switched to a digital frame relay network by increasing the traffic volume.