JPS61196660A - Digital branch trunk for photographic multiple address connection - Google Patents

Abstract

PURPOSE:To intend the simplification of the software processing procedure, by reducing the multiple address connecting path setting frequency in the time sharing switching system. CONSTITUTION:In a brach trunk 13 an answer signal is transmitted to an attendant board 4 passing through a connecting part 15 through an built-in digital addition circuit. The branch without addition in the transmitting direction in the branch trunk 13 is indicated by 19, in the same way the branch making it as n-1 addition only to a specific branch point in the receiving direction by 20, and its addition circuit by 21. With this constitution, this branch trunk 13 is provided with an extension and contraction section, an operation section, an compression section, etc. of a mu low PCM code, as well makes the operating conditions as the branch 19 without addition in the photographic information transmitting direction to the connecting paths 16 and 17 more than the connecting paths 15 and (18), on the one hand, in the loop signal receiving direction from the connecting paths 16 and 17 to the connecting paths 15 and (18) a memory making it as n-1 addition only to one specific branch point from an addition circuit 21 is installed. In this way, the addition conditions become loose, the signal branch of high level becomes possible, as well the cost reduction by the simplification of the operation circuit is intended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a digital branch trunk for photo broadcast connections in a time division switching system.

[Background of the invention]

Figure 1 (α) shows the system configuration diagram of each connection state of the photo broadcast connection method using manual connection in the conventional time division switching system.
t (a). In Fig. 1 (α) and (A), 1 is a dedicated m-line trunk line connecting to the photo destination;
2 is a trunk, 3 is an exchange, 4 is a relay stand, 5 is an interface device, 6 is a photo receiver, 7 is a trunk for interfacing the branch line and other station trunk lines, and 8 to 12 are setting connections within the communication path network.

It's a bus.

With this configuration, when a call is received on trunk 2 from a photo destination connected via trunk line 1 in FIG. Connect to stand 4. When the operator of relay stand 4 responds to this and learns that the call is a broadcast relay connection call to other stations, including the own station in the photo, the operator of relay stand 4! By operating a key or the like, the connection path 9 is closed and the photo receiver 6 is captured through the interface device 5, and the connection path 1o is closed and the interface trunk 7 of the branch line/other station relay line is captured, and voice or dial information is captured. to start the other station. When the other station learns from this information that it is photo reception information, it captures and activates the photo receiver through its own exchange (not shown). When the photo receiver is activated, it sends out a response signal on the in-band frequency assigned to its own station. The photo receiver 6 of the exchange 3 also responds in the same way.

send out the issue. These response signals are detected by the relay console 4 and notified to the operator of the relay console 4 through visual and audible displays. At this time, if there are multiple broadcast connections at the end of the branch line's relay line for other stations, a response signal with a different in-band frequency will be returned for each broadcast month for the number of broadcast connection destinations. Notify the operator of relay stand 4 with the corresponding visible/audible display. The operator of relay stand 4 should check this display.

When it is learned that all connection destination response signals have been returned, the connection paths 8, 9 and 10 are sequentially opened by operating the telephone key on the relay stand 4, etc., while the connections within the communication path network shown in Fig. 1 <h> are opened. pass 1
1 and 12 are closed to disconnect the relay stand 4, and in this state, photo transmission information is received and relayed.

In this way, according to the conventional method, the connection path of the exchange is 6.
- Set/cancel connection paths 8, 9, and 10.

and settings for connection paths 11 and 12.

It is necessary to carry out intervention processing many times for each connected call, and the processing procedures in the stored program type switching system become complicated and diversified accordingly.

Also, in order to eliminate the above inconvenience, branch.

An effective method is to use rank to connect the photo receivers of the own station in duplicate using hardware, and then connect incoming lines to the branch trunks as appropriate.

However, if a digital branch trunk that performs conventional rL-1 addition is used as the branch trunk, when a digital signal obtained by μt==-PCM encoding is added to an analog signal with a high signal level, such as photographic information, by n-1. 8
The quantization step of 256 bits or 256 steps may be exceeded, possibly resulting in significant distortion of the normal input signal.

[Purpose of the invention]

The objects of the present invention are: 4. An improved photo broadcast connection in a time division switching system that reduces the number of broadcast connection bus setups and simplifies software processing procedures.

To provide digital branch trunks for .

[Summary of the invention]

The present invention eliminates the simultaneous connection of multiple terminal devices by changing the connection path settings in the communication network of the exchange, and connects the terminal devices necessary for photo information relay connection in multiple hardware ways using branch trunks. As a branch trunk that enables broadcast connections simply by connecting lines to the main branch trunk as appropriate, we focused on the uniqueness of the transmission signal direction in order to realize branching without exceeding the 8-bit, or 256 step, quantization stage. However, as a calculation method, the transmission direction is a simple branch without n-1 addition, while the reception direction is a branch with n-1 addition to one specific branch point. It is a digital branch trunk.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. FIGS. 2(α) and (h) are for photo broadcast connection in the time division exchange system according to the present invention.

Photo broadcast connection using digital branch trunks.

FIG. 3 is a system configuration diagram of each connection state showing an example of the system.

It is. In FIGS. 2(α) and (b), the same applies hereafter.

The same symbols as in Figure 1 indicate the same or corresponding parts.

13 is a digital branch transformer according to the present invention.

14 to 18 are set connection paths within the communication network.

With this configuration, if the photo transmission connected by 1m1 of relays such as leased lines in Figure 2 (α) is activated from last month, exchanger 3
closes the connection path 14 in the communication network and connects the photo transmission destination relay line 1 through the trunk 2 to the relay stand 4. Relay stand 4
When the operator receives a connection request to transfer photo information to another station such as a branch office in response, the operator closes the connection path 15 by operating the telephone key on the relay stand 4, seizes the branch trunk 13, and closes the connection path 15. The path 16 is closed, the trunk 7 is captured, and the relay line of the branch line and other stations is activated. In the case of a photo information broadcast connection that includes the own station, one of the branch trunks 13 is connected to the photo receiver 6 of the own station and its interface device 5 through a connection path 17. In this state, a connection (not shown) was made last month, when the relay line of another station on the branch line was activated, it responded to it, and when it learned from the dial or voice information that it was a request to receive a photo, it captured the photo receiver of its own station. to start. When this photo receiver is activated, it returns a response signal of a specific in-band frequency assigned to its own station as a connection completion signal. This response signal is returned to the branch trunk 15 via the trunk 7 and the connection path 16 through the branch line and other station trunk line. A response signal from the photo receiver 6 of the exchange 6 is also returned to the branch trunk 13 via the interface device 5 and the connection path 17. In the branch trunk 13, the response signal is transferred to the relay board 4 via a built-in digital adder circuit and a connection path 15. At the relay stand 4, this response signal is identified by a detector, the corresponding partner station indicator lamp is turned on, and the response signal is sent out from a monitor circuit including a speaker or the like. The person handling the relay stand 4 checks this condition and sends a photo.7.

After informing the destination, you can connect by operating the telephone key etc.

14, 15 while releasing the connections shown in FIG. 2(h).

Close path 18 and intervene in its handling operation.

In this state, the photo information is relayed in preparation for the next connection request. Also digital.

Le branch trunk 13 allows you to send photos to other parties.

Divide the connection and operating status into several stages each time.

A person who proceeds with an operation while sending and receiving response signals.

In the case of Eq., the response signal is generally at the audio level.

In contrast, the transmission level is two to three times higher. Furthermore, in the case of a photo broadcast connection, it is assumed that a plurality of such response signals will be sent back at the same time. Therefore, in the conventional method of adding n-1 to all branch points as in the case of branch trunks, if we take three branches as an example, A + B +
The formula becomes C-(A or B or C), and there is a possibility that the quantization stage represented by the 8-pit code will be exceeded at the time when the R numbers are added, and in some cases, the normal input signal may be greatly distorted. . like this.

°　8　.

In order to achieve branching without exceeding the 8-bit, or 256 step, quantization stage, the present invention focuses on the particularity of the transmission signal direction, and uses simple branching without rL-1 addition in the transmission direction as an arithmetic method. On the other hand, the reception direction can be realized by performing n-1 addition to one specific branch point.

FIG. 3 is a pull diagram showing the concept of calculation conditions for one embodiment of the digital branch trunk 13 for photo relay connection according to the present invention. In FIG. 3, 19 is a branch without addition in the transmission direction within the branch trunk 13, and 20 is a branch 1 in the reception direction.
Branching with n −1 addition to only one specific branch point, 21
is the adder circuit.

It is equipped with a CM code decompression section, calculation section, compression section, etc., and the calculation conditions are as shown in the figure, from connection path 15 (18) to connection path 16. Branch 19, and return transmission from connection path IS, 17 to connection path 15 (1B).

In the signal reception direction, a storage device is provided so that the addition circuit 21 performs n-1 addition to only one specific branch point. This loosens the addition conditions, making it possible to branch high-level signals and reducing costs by simplifying the arithmetic circuit.

You can expect it.

FIG. 4 is a block diagram showing the concept of calculation conditions of another embodiment of the digital branch trunk 1'5 for photo broadcast connection according to the present invention. In FIG. 4, 22 is a switching device;
23 is its switching control O terminal; 24 is a conventional all-branch-point n-1 addition circuit; 25
is an rL-1 addition circuit to only one specific branch point according to the present invention.

With this configuration, the switching control signal input to the switching control terminal 25 of the switching device 22 allows connection +5 to all branch points n-1 adding circuits 24 connected to paths 15 (18), 16, and 17 and to only one specific branch point. n-1 of
Switching between the adder circuit 25 and the adder circuit 25 is performed.

This makes it possible to easily achieve both the functions of the conventional branch trunk and the branch trunk according to the present invention. Therefore, for general meetings and photo circulars.

There are two types of calls, continuous and continuous, at stations with relatively low call volumes.

Now, let's create two separate types of branch trunks.

This eliminates the need for both economical and mounting space considerations.

It's advantageous. 5 [Effects of the Invention] As described above, the photo communication connection digital camera of the present invention.

According to the barrel branch trunk, compared to the traditional method.

Switching of the connection bus when broadcasting one photo information broadcast.

Since the number of r5Js can be reduced, it is better to use an accumulation program.

As a result, program state transitions in the exchange system are small and can be processed using simple general connection n-chins, which is effective in simplifying program processing and reducing the number of processing steps. Since branching can be achieved without exceeding the limit, it is effective in improving system quality.

[Brief explanation of the drawing]

Figure 1 <a> and <h> are system configuration diagrams illustrating each connection state of the conventional photo broadcast connection system, and Figure 2 (α) t
(h).11. Figure 3 shows the layout of the digital branch for connection according to the present invention. older brother. A digital branch tran for the Dodo-Goku connection by Ming. / I) - Block diagram showing frozen X maple thoughts of Central M example, No. 4
The cause is also a pro that shows the concept of operation of other *parameters. This is a diagram. 1...Relay connection, 2...Trunk, 3...Father Kyoshin,
4...Relay stand, 5...Interface device, 6
Kawayo. A-receiving IpH7・) Rank, 13...Tigital minute 1・
・Gi trunk, 14-18...Construction pillow bus, 19・
.... Branching without adding Wando in the branch trunk, ・20
... Only go to the one time-saving junction in the direction of the father's signal. -1 Branch with bad breath, 21... Part 7 JOJl1g
J omitted, 22°...Switching device, 23...Switching control terminal, 24...All. Branching disease rL-1711] Nasal circuit, 25...1 of specific branching fish. rL-1 Manguchi Ken 11Pil omitted to complete set. Representative Patent Attorney Ogawa # Power, 7゜・12・

Claims (1)

[Claims] 1. In a time-division exchange system that performs photo broadcast connection, digitally encoded photo information is branched and distributed simultaneously to the photo receiver of the own station and the relay line of other stations to which the broadcast is to be made. In a digital branch trunk for photo broadcasting connection that includes a raw PCM code decompression section, a calculation section, and a compression section, the calculation condition for the calculation section is to input one specific branch point to another branch point in the photo information transmission direction. In the direction of receiving return signals from the photo receiver of the own station and the relay line of other broadcast destination stations, a specific branch outputs the sum of all input signals from other branch points. A digital branch trunk for photo broadcast connection, characterized in that an n-1 addition circuit is provided only for points. 2. A μ-low PCM code expansion unit that branches and distributes digitally encoded photo information to the own station's photo receiver and the relay line of other broadcast destination stations at the same time in a time division exchange system that performs photo broadcast connection. In the digital branch trunk for photo broadcasting connection, which includes a calculation section and a compression section, the calculation condition in the calculation section is that one specific branch point input is set as another branch point output in the photo information sending direction, and the above automatic branch point input is set as the other branch point output. In the direction of receiving return signals from the photo receiver of the station and the relay line of other broadcast destination stations, n- to only one specific branch point where the output of one specific branch point is the sum of all input signals of other branch points. 1. A digital branch trunk for photo broadcast connection, characterized in that it is provided with a 1 addition circuit, an n-1 addition circuit to all branch points for general meetings, and a switching circuit that switches between both of the addition circuits using a switching control signal.