JPS6161542A - Subscriber's line accommodation system - Google Patents

Abstract

PURPOSE:To make possible the use of a packet in an ISDN by transmitting a sound signal with a digital signal of an ADPCM device and controlling a data speed of the packet used for communications between data terminals at 32Kbps. CONSTITUTION:A signal from a digital telephone 1 is converted to a PCM signal of 32Kbps and added to a network terminating device5. On the other hand, a signal from a data terminal 4 is added to the network terminating devices. A signal from the telephone 1 inputted in the device 5 or from the terminal 4 is inputted to a subscriber's line terminating device 7 through a network terminating device 6. A signal from the device 7 is inputted to a converter terminating device 8, a signal from the telephone 1 is converted to a signal of 64Kbps each channel, and a signal from the terminal 4 is added to a direct converter 11. Thus, the use of the packet can be used in terms of ISDN.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a subscriber line accommodation system that can be used in an I5DN.

(Prior art) In the subscriber line accommodation system conventionally adopted in ISDN, voice and high-speed packet data are transmitted at 64 kbps.
I assigned it to the B channel of . Therefore, the channel structure of subscriber lines using existing telephone lines included one or two B channels in addition to a 16 kbps D channel for communication control signals. On the other hand, if an ADPCM device is used, audio can be transmitted at 32 kbps (not 64 kbps) without deteriorating sound quality, and the data rate of packets used for communication between data terminals is also normally No need to set it to 64k bps (32k bps
s was sufficient.

(Problem to be Solved by the Invention) Therefore, in the conventional system, the B channel was not used effectively, and due to constraints on transmission characteristics, the data rate in the case of a channel structure including 2 channels (B channel) fr: The drawback is that data cannot be transmitted over a sufficiently long distance due to the high B.

An object of the present invention is to use an ADPCM device to transmit audio signals as digital signals of 32 kbps, and to increase the data rate of packets used for communication between data terminals to 32 kbps.
The above disadvantages are removed by limiting to 64 ps.
An object of the present invention is to provide a subscriber line accommodation system configured to be able to interface with an IS and DN using a POM@kbps system.

(Means for Solving the Problems) The subscriber line accommodation system according to the present invention is equipped with a plurality of digital telephones, a plurality of data terminals, a plurality of domestic buses, and an exchange termination device, and can be used in ISDN. This was achieved by configuring it as follows.

Multiple digital telephones have analog voice signals and ADP
ADPC for converting between CM digital signals
It is equipped with an M device.

The plurality of data terminals are for handling data rates less than or equal to a predetermined data rate.

A multiple home bus is meant to accommodate multiple digital telephones and multiple data terminals, one pair at a time.

The exchange terminal equipment includes a kDPCM/POM code converter for each 32 kbps unit channel, and is designed to pass only signals between a plurality of digital telephones to the ADPCM/PCM code converter.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

Figure 1 is Mizumoto 1! FIG. 2 is a block diagram showing one implementation for realizing a subscriber line accommodating system based on the above. In Figure 1, 1 is a digital telephone, 2 is an audio circuit, and 3 is an ADP.
CM device, 4 a data terminal, 5.6 a network termination device, 7 a subscriber line termination device, 8 an exchange termination -f;
9 and 10 are ADPCM/I'OM code converters, respectively, and 11 is a switch.

In the first [F], the voice input to the transmitter of the digital telephone 1 is converted into an analog voice signal through the voice circuit 2, converted into a 32k bps POM signal by the ADPCM device 2, and sent to the network termination device 5. Added. The signal output from the data terminal 4 (32k b
ps) is also added to the network termination device 5. The signal from the digital telephone 1 or the signal from the data terminal 4 inputted to the network termination device 5 is transmitted via the network termination device 6 to the subscriber line of the channel structure B', +B'2 +1), and then to the exchange. The data is input to the subscriber line termination device 7 on the side.

The signal output from the subscriber line termination device 7 is input to the exchange termination device 8, and if the signal is from the digital telephone 1, the signal is transmitted at 32 kbps for each unit channel (B/channel).
DPC! 64kbp through M/POM code converter 9
If the signal is from the data terminal 4, it is directly applied to the exchange 11.

Conversely, if the signal output from the exchange 11 is a signal from the digital telephone 1, it is converted into a 32kbpS signal by the ADPCM/PCM code converter 9, and if it is a signal from the data terminal 4, it is directly sent to the subscriber line termination device. 7 is input. From the subscriber line termination device 7 to the channel structure B'l +8; +
If the signal passing through the network termination devices 5 and 6 via the subscriber line D is a signal from the digital telephone 1, it is converted into an analog signal by the ADPCM device 3 (audio circuit 2
If the signal is from the data terminal 4, it is processed by the data device 4.

In FIG. 1, the 32 kbps channel (B' channel) is 2 channels, but it goes without saying that 1 channel, 3 channels, or any other number of channels can be used. In FIG. 1, the D channel between the communication and M suppression signals is omitted.

(Effects of the Invention) As explained above, the present invention adopts an ADPCM device to transmit voice as a 32 kbps digital signal, and limits the data rate of the packet used for communication between data terminals to 32 kbps. , IS using PCM device,
32kbl) by interfacing with DN.
Up to 4 channels per subscriber in S (B' channel)
When two channels are allocated for use in 15DN, the transmission speed can be kept lower than in the past, resulting in a longer transmission distance. In addition, at 321 cbps, no\DPOM/
By installing a POM code converter and passing only the signal between digital handsets through the human DPOM/PCM code converter, the 64k
It also has the effect of being able to interface with ISDN that uses POM at bps.

In order for an l5DN network to accommodate 4 channels (B channel), two sets of subscriber lines are required, which would require 6 subscriber lines, but according to the present invention, a channel (B' channel) equivalent to 4 channels (B channel) can be accommodated at low cost. ).

[Brief explanation of drawings]

FIG. 1 shows the 8D
FIG. 2 is a block diagram illustrating one implementation of a subscriber line accommodation system using a POM device. 1...Digital 4-speaker 2...Audio circuit 3.
...Person DPOM device 4...Data terminal 5.6
...λ1mu1winter end (n 7...Subscriber line termination device 8...Exchange 1 termination 4 installation 9.10-hDPOM/POM code converter 11...
·switch

Claims (1)

[Claims] a plurality of digital telephones having an ADPCM device for converting between analog voice signals and ADPCM digital signals; and a plurality of data terminals for handling packets at a data rate less than or equal to a predetermined data rate; a plurality of in-home buses for accommodating one pair each of the plurality of digital telephones and the plurality of data terminals;
an ADPCM/PCM code converter for each unit channel of k bps, and an exchange termination device for passing only signals between the plurality of digital telephones to the ADPCM/PCM code converter, and used in ISDN. A subscriber line accommodating system characterized by being realized by configuring it so that it can be used.