JP2520147B2 - Audio channel data extraction / insertion circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] Regarding a circuit for pulling in voice data or inserting voice data, there is provided a circuit for pulling voice data in a digital telephone line.
For the purpose of providing a circuit that can be inserted properly, a voice data extraction circuit (32, 34, 36, 38) and voice data insertion circuit (42, 44, 46, 48).

[Industrial applications]

The present invention relates to a circuit provided in a digital line concentrator having digital subscribers in a large-scale information communication network for performing voice data introduction or voice data insertion.

Digital telephones that transmit voice signals as digital signals have been developed in place of conventional telephones that transmit voice signals as they are (or analog signals). In the current situation where digital communication devices such as facsimiles and personal computers are widely used in telephone subscribers' homes, it is advantageous to use digital type telephones in the same way because they can be handled in the same way, which allows large-scale information communication networks (ISDN, etc.) Further improvement in performance can be expected.

In telephone exchanges, the voice signal of the subscriber's telephone line is drawn into the maintenance device and the voice signal is inserted from the maintenance device to the subscriber's telephone line for the purpose of inspection during system construction and maintenance and inspection during system operation. Has been. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for exchanging a telephone of a digital telephone, and more particularly to a circuit for pulling in / inserting voice data in a concentrator thereof.

[Conventional technology]

The digital telephone circuit is as shown in FIG. 10 is the digital telephone, 12 is a terminal controller, 14 is a network terminating device, 16 is a digital subscriber line circuit (DLC), 18
Is a DLC controller, 20 is a line time division switch, 22
Is a digital line interface, 24 is a line processor, 26 is a network (switch), 28 is a central processor, and 30 is a maintenance console.

In conventional analog telephones, digital subscriber line circuits
16 is a subscriber circuit (SLC), and an analog telephone is connected to the subscriber circuit through a telephone line, and A / D conversion is performed here to lead a digital voice signal to the time switch 20.

In addition, when a call is made from an analog telephone, a loop is formed by off-hook, and the switching side detects this loop by scanning. The call is made, the call is received, etc. by knowing that the call is sent and received.

The time switch 20 collects lines, for example 1920
The subscribers are narrowed down to 120 channels and sent to the network 20. The concentrating rate is related to the call volume, and the concentrating rate is lowered when there are many subscribers with a large call volume.

The line processor 24 exchanges information with the central processor 28 of the network 26 to control which of the output side channels of the time switch 20 is connected to which of the input side terminals of the network 26. Since connection information such as the telephone number of the other party is also included in the packet in the digital telephone, the DLC 16 takes this out and sends it to the line processor 24 via the DLC controller 18 and the interface 22. In response to this, the line processor 24 performs the above connection control. The DLCC18 and DLIF22 are also not analog telephones.

Although not shown from the network 26, it is returned from the network to the other party (called) telephone (when the other party is within the own station) or transmitted through the trunk line and another network (when the other party is another station). .

[Problems to be solved by the invention]

In such a telephone line, to test whether each subscriber's telephone line is normal or not, it was repaired because it was abnormal, but whether it returned to normal with that, console on the side of the exchange (exchange) side
By operating 30, the voice signal flowing through the subscriber telephone line is pulled in and the voice signal is inserted into the subscriber telephone line.

If the audio signal is analog, this is easy, just branch and combine. However, if it is digitized and packetized, simple branching and coupling (similar to analog) cannot be used.

Therefore, it is an object of the present invention to provide a circuit capable of accurately inserting / inserting voice data in a digital telephone line.

[Means for solving problems]

FIG. 1 shows the configuration of the present invention. As shown in the figure, in the present invention, the digital concentrator circuit unit, specifically, before the time switch 20, after the digital subscriber line circuit 16, the downlink channel,
For each upstream channel, the channel data extraction circuit 32, 24,
36, 38 and insertion circuits 42, 44, 46, 48 are added. The extraction and insertion circuits 32 and 42 are inserted into the telephone line of the calling side, the extraction insertion circuits 38 and 48 are inserted into the telephone line of the called side, and the insertion circuits (inserter) 44 and 46 and the extraction circuit (dropper) are inserted. 34,
36 is connected to the telephone line to which the maintenance device 30 is connected.

[Action]

The digital signal from the calling subscriber is serially output from the subscriber line circuit 16 in units of 8 bits in this example.
Up-highway UHW is transmitted. The extraction circuit 32 extracts the data (8 bits) of the specific subscriber channel designated by the maintenance device 30 and sends it to the insertion circuit 44 through the line l ₁ . The inserting circuit 44 is connected to another up-highway, and inserts the extracted data into a specific channel assigned to the maintenance device 30. Therefore, the maintenance device 30 can receive this via the time switch 20 or the like, and thus can monitor the voice signal of the desired subscriber telephone set.

To transmit the voice of the maintenance person to the called subscriber, the maintenance device 30
Then, the voice data of the maintenance person is digitally added to the voice data of the calling subscriber extracted as above, and the result is extracted by the extracting circuit 34, line inserted in the down highway such as the time switch 20.
It is sent to the insertion circuit 42 through l ₂ and is inserted into the specific subscriber channel. In this way, the voice of the calling subscriber and the voice of the maintenance person can be transmitted to the called subscriber.

In a normal call mode in which voice data is not extracted / inserted, the extraction / insertion circuit is in a through state. In this case, the calling subscriber is the UHW side in the figure and the called party is the DHW.
If it is on the side, the UHW-through state 32 and 42, 20, 26
Voice data is sent from the calling subscriber to the called subscriber through the route of (not shown), 20, through states 38 and 48, and DHW.

The voice data of the subscriber connected to the down highway DHW is extracted by the extraction circuit 38, the insertion circuit 46, and the time switch.
20, etc., through the route of the maintenance device 30. It is the maintenance device 30 and the time switch that superimpose the voice of the maintenance person on this subscriber.
20 and so on are taken along the path of the extraction circuit 36 and the insertion circuit 48.

〔Example〕

FIG. 2 shows a concrete example of the extracting / inserting circuit. Reference numeral 52 is a serial-parallel converter, 54 is an 8-bit latch circuit, and 56 is a parallel-serial converter, which form an extraction circuit. Reference numerals 58 and 62 denote selectors, which form insertion circuits. Again 68
Is a serial-parallel converter, 66 is an 8-bit latch circuit, and 64 is a parallel-serial conversion circuit, and these constitute an extraction circuit. Corresponding to FIG. 1, 52, 54, 56 are 32 in FIG. 1, 58, 62 are 44, 42 in FIG. 1, 64, 66, 68 are 34 in FIG. UHW
₁ indicates the up-highways on the left side of 32 in FIG. 1, UHW ₂ on the right side of 42, and UHW ₃ on the left side of 44. A timing generator 60 outputs the extraction timing T ₁ and the insertion timings T ₂ and T ₃ .

The maintainer specifies the channel that he wishes to pull in, which causes the timing generator 60 to generate the signal T ₁ at the timing at which the channel appears. As a result, the latch 54 takes in 8 bits output from the serial-parallel converter 52. Next, the timing generator 60 outputs the signal T ₂ at the timing at which the up-highway specific channel to which the maintenance device 30 is connected appears. During this timing signal T _2, the selector 58 operates from the input a to the input b.
The output of the parallel-serial converter 56 is sent to the time switch 20 (not shown), and the maintenance device 30 receives this.

The voice data of the calling subscriber and the voice data of the maintenance person transmitted by the maintenance device 30 appear on the down highway DHW ₃ , which is taken into the latch 66 at the timing T ₂ for the maintenance device, and the timing for the caller. At T ₃ (this is the same as T ₁ but delayed by the number of frames according to the processing time), it is selected by the selector 62 and sent to the up-highway UHW ₂ .

Timings T ₂ and T ₃ are not output in a state where extraction / insertion of voice data is not performed. Therefore, the data of highway UHW ₁ is only serial-parallel converted, latched, parallel-serial converted, and passed through selector 62 to the highway. Exit to UHW ₂ . Further, when only the voice of the calling subscriber is monitored, the timing T ₃ is not output, so that the data of the highway UHW ₁ is 52,54,5.
It is transmitted to UHW ₂ via routes 6, 62, and is also transmitted to maintenance device 30 via 56 to 58.

The number of channels used by the maintenance device is, for example, two channels per 120 channels, but this may be changed appropriately.

〔The invention's effect〕

As described above, according to the present invention, a function such as a maintenance person interrupt in an analog telephone line can be implemented also in a digital telephone line, and by this function, the normality of the line can be tested.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a digital telephone line. In FIG. 1, UHW is an input side highway, DHW is an output line side highway, 32, 34, 36 and 38 are extraction circuits, and 42, 44, 46 and 48 are insertion circuits.

Front Page Continuation (72) Inventor Kiyofumi Mise 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Takashi Nara, 1015, Kamedota-chu, Nakahara-ku, Kawasaki, Kanagawa (56) Reference Document JP-A-54-74616 (JP, A)

Claims (2)

(57) [Claims] 1. An extraction circuit (32, 34, ...) Inserted into each input line side highway (UHW) and output line side highway (DHW) of a digital concentrator circuit unit to which a digital telephone (10) is connected.
...) and insertion circuits (42, 44, ...), and a certain input highway (UHW) and output highway (DHW) channels are assigned to the maintenance device (30), and the maintenance device (30) Extraction circuit (32) in which the voice data of the calling subscriber's channel specified in step 3 is inserted in the highway on the incoming line side.
The extracted voice data is inserted by the insertion circuit (44) into the channel of the highway on the incoming line side assigned to the maintenance device, drawn into the maintenance device (30), and the call origination is output from the maintenance device (30). The sum of the voice data of the maintenance person and the voice data of the maintenance person is sent to the channel of the highway on the outgoing line side assigned to the maintenance circuit (30), extracted by the extraction circuit (34) inserted in the highway, and the call is made. A voice channel data extracting / inserting circuit, characterized in that it is inserted into a calling subscriber channel of the incoming line highway by an inserting circuit (42) inserted into the incoming line highway to which the subscriber is connected. 2. The voice data of the channel of the called subscriber designated by the maintenance device is extracted by the extraction circuit (38) inserted in the outgoing side highway, and the extracted voice data is assigned to the incoming side assigned to the maintenance device. Circuits inserted into highway channels (46)
The sum of the voice data to the called subscriber and the voice data of the maintenance person output from the maintenance device (30) is inserted into the maintenance device (30), and the sum of the voice data of the maintenance worker is output side assigned to the maintenance device (30). It is sent to the channel of the highway, extracted by the extraction circuit (36) inserted in the highway, and extracted by the insertion circuit (48) inserted in the output highway to which the called subscriber is connected. 2. It is adapted to be inserted into a called subscriber channel of the above.
Data extraction / insertion circuit for the described voice channel.