JPS6028479B2 - Simultaneous transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simultaneous transmission system, and more particularly to a system for simultaneously transmitting the same message to subscribers of a time division switch.

In the event of a disaster, etc., telephone traffic increases abnormally, and calls from important subscribers such as the police and fire department cannot be made smoothly.

In order to prevent such a situation from occurring and ensure calls from important subscribers, it is necessary to suppress calls from general subscribers. In such cases, general subscribers will be notified of the abnormality and asked to refrain from making calls. It is difficult with conventional time-division exchange machines to simultaneously send the same message to all calling telephone subscribers.

FIG. 1 shows the connections of a conventionally known time division switch.

- In the figure, SUB to SUB are subscriber telephones, LC,
~LCn are subscriber circuits provided for these telephones.

Subscriber circuits LC, ~LCn Chunichi are hybrids for 2-wire to 4-wire conversion, COD is an encoder that converts analog call signals to PCM codes, DEC is a decoder that converts PCM call signals to analog signals, AGj, AW is an AND gate, which is a speech gate that becomes conductive in a given time slit and allows speech signals to pass through. Furthermore, CTR
LN is a circular counter synchronized with the time slot of the highway (described later) common to subscriber telephones SUB to SUB.
M is a subscriber number holding memory for storing subscriber numbers connected to the highway and is periodically read out by the counter CTR, and FOG is for distributing call information on the down highway HW2 to all subscriber telephones SUB, ~SUBn. The fan-out gate OG is an OR gate for connecting call information from all telephones to the uplink highway HW, and TDSW is a time-division switching call path. A certain subscriber telephone, e.g. SUB, is connected to highway HW, HW.
Connection to a certain time slot of No. 2 is carried out by writing the subscriber number in the address storage area of the subscriber number holding memory LNM that is successively output by the counter CTR at the time of the time slot.

That is, at the time of the time slot, the counter C
The subscriber number, for example 1, is read out from the subscriber number holding memory LNM by the output of TR, and this is sent to the decoder DE.
C. The subscriber circuit LC is decoded to produce an output at the terminal 1 corresponding to the subscriber number, thereby making the band gates A and AGi of the subscriber circuit LC conductive during the time slot.
The speech signal sent from the telephone supply UB, passes through the hybrid system, is converted into a PCM code at the encoder COD, passes through the band gate A in the above time slot, passes through the gate OG, and reaches the up-highway HW, where it is It is time-multiplexed with call signals from other telephones and enters the time-division switched call path TDSW.

The call signal sent from the other party's telephone enters the time division switching channel TDSW from the upstream highway (HW, or other) in the time slot assigned to the telephone in the same manner as above.

The slots are exchanged and placed in the time slot for the telephone SUB on the down highway HW2. Therefore, this call signal is routed through the fan-out gate FOG to the subscriber circuit LC which is conducted in said time slot.
, passes through the AND gates A■,AGj, and decoder DEC
The signal is then decoded into an analog signal and received by the telephone SUB through the hybrid system. As above, phone S
UB, can talk to the other party's phone. Therefore, the number of bits to be stored in each address of the subscriber number holding memory LNM must be such that it can identify all the subscribers accommodated in this line concentrator, that is, the fan-out gate FOG and the OR gate OG. If the number of subscribers is n, the number of bits is log2n, for example, n=5
For 12, 9 bits are required.

Because of this configuration, a certain point on the highway
If you try to send information on one time slot, for example, the message information announcing the above-mentioned abnormality, to multiple subscribers at the same time, the address for the time slot assigned to the above information in the subscriber number holding memory LNM is The number of bits must be prepared for the number of subscribers who transmit simultaneously.In other words, the decoder DECo and the subscriber number holding memory LNM must be arranged in parallel for the number of subscribers who transmit simultaneously. This is impractical and difficult to implement when there are many transmission subscribers.

SUMMARY OF THE INVENTION An object of the present invention is to economically provide a means for simultaneously transmitting information such as an announcement at the time of abnormal neck strain to a plurality of subscribers in a time division exchange as described above.

Furthermore, in the above, it is an object of the present invention to provide a means that makes it possible to selectively determine which members should simultaneously transmit the above information. This purpose, according to the invention, is to place message information for simultaneous transmission into one time slot of a time-sharing highway carrying call information received by each of a plurality of telephones housed in a time-sharing exchanger. means for displaying on the subscriber circuit of the telephone whether or not simultaneous transmission is to be performed; A gate means is provided to issue an output when simultaneously coexisting with a simultaneous transmission command synchronized with a time slot, and the simultaneous transmission command is sent to the subscriber circuit of all subscriber telephones, and the output of the gate means is used in the subscriber circuit for communication. It is more difficult to control the conduction of the gate.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a connection diagram of an embodiment of the present invention. In the figure, the symbols indicate the same things as in FIG. Each subscriber circuit LC'
, ~LC'n is a flip-flop F/F as a means for indicating whether or not to perform simultaneous transmission to each of the subscriber circuits LC, ~LCn shown in FIG. In the case of simultaneous coexistence, the output is used as a gate means and an AND gate AGi is added, and an OR gate OG is added, and a subscriber number decoder DEC is added in common to the subscriber circuits LC', to LC'n. . Note that a terminal w for simultaneous transmission command is added to the decoder DECo. When simultaneous transmission is not performed, the output of the AND gate AG of each subscriber circuit is 0, as will be described later, and therefore the decoder DEC. The output of is the OR gate O.
G, and then the AND gate AGi, A, which is a communication gate.
The conduction of C.degree. C. is controlled, and a call is made in exactly the same manner as in FIG. For example, when performing simultaneous transmission, abnormalities may occur,
When simultaneously sending message information of abnormal Hanhan,
Announcement device A that generates messages to be transmitted simultaneously
N is activated, and the message information generated from the announcement device AN is placed on any one time slot of the down highway HW2 via, for example, the time division switching channel network TDSW.

Simultaneous transmission designation information is written in the address portion of the subscriber number holding memory LNM designated in this time slot. When this simultaneous transmission designation information is output one after another, the decoder DECo similarly decodes it as one of the subscriber numbers, and outputs 1 to the simultaneous transmission command terminal w of the decoder DECo.
Send out. Subscriber number holding memory LNM is counter C
Since the simultaneous transmission commands are periodically issued by the TR, the simultaneous transmission commands are periodically sent from the terminal w. On the other hand, when the subscriber to whom the closing message is to be sent is not making a call and is free, the number information LN of the subscriber's telephone is sent.

This number information LN is decoded by a decoder DEC,
Signal 1 is sent to the set terminal S of the flip-flop F/F of the subscriber circuit of the subscriber telephone, for example LC,', and this is set. Then, the output Q changes from 0 to 1, and as a result, the AND gate AG becomes in a conductive state in the time slot in which the simultaneous transmission command is sent. Therefore, in the time slot on the down highway HW2 where the above-mentioned Hanbin message is carried, signal 1 is sent from the simultaneous transmission command terminal w of the decoder DECo as described above, and this signal 1 is transmitted to the AND gate AG, , OR gate OG.
, and put the band gate AGi into the conductive state, the above-mentioned closing message signal passes through the gate AGi and is sent to the decoder DE.
It is decoded into an analog signal at C and sent to the telephone SUB through a hybrid system. If you go off-hook at telephone SUB in this state, you will hear the above closing message. For a subscriber who is currently on a call, when you end the call and go on-hook, the subscriber number L of that subscriber will be displayed as described above.
N is sent, the flip-flop F/F is set in the same manner as above, and the above closing message is transmitted at the same time.

For important subscribers who do not need to request call suppression, such as the police and fire department, the number information of the subscriber is not sent to the decoder DEC, and therefore simultaneous transmission is not performed. be able to.

Note that when the abnormal Hanminato disappears, a reset command RES is sent to cancel the above-mentioned simultaneous transmission and return to the normal state.

With this command, a signal 1 is input to the reset terminal R of the flip-flop F/F of each subscriber circuit L〇, to L〇n, and the output of the decoder DEC is all 0, which is input to the set terminal S. Therefore, the flip-flop F/Fs of all subscriber circuits are reset. As a result, all subscriber circuits return to the normal state all at once and are released from simultaneous transmission. In this case, the output Q of the flip-flop F/F becomes 0,
Therefore, ANDGATE AG. The output of is the simultaneous transmission command signal (
It becomes 0 regardless of the presence or absence of the signal (given from the terminal w of the decoder DECo). FIG. 3 is a connection diagram of a different embodiment of the present invention.

The figure shows one subscriber circuit LC″, decoder DECo,
Although the subscriber number holding memory LNM and counter CTR are shown, there are many other subscriber circuits (LC″2 to L〇′n
), and the communication lines going in and out of these are shown in Figures 1 and 2.
As shown in the figure, it is assumed that they are connected to the up and down highways by an or gate OC and a fan-out gate FOG, respectively. The symbols in the figure indicate the same ones as in FIG. 2. FIG. 4 shows the time slots assigned to telephone SUB when it is busy, the time slots W and frame pulses FP (shown in a) assigned to the messages to be transmitted simultaneously, and the flip-flops F/
12 is a time chart showing the time relationship between F and the set/reset state (shown in b). If simultaneous transmission is to be performed now, the above message information for simultaneous transmission is assigned to the time slot tw that exists at the end of the frame, that is, immediately before the frame pulse FP, and the above-mentioned time slot tw' of the subscriber number holding memory LNM is allocated. Write the simultaneous transmission command to the corresponding address part.

Suppose that the telephone service UB, is busy and a time slot t, has been allocated for this purpose.

At this time, as shown in frames F and F2 of FIG. 4a, a signal is sent to terminal 1 of the decoder DECo for the telephone SUB in the time slot t, and the AND gates AGi and AG°C are opened and a call is made. This is the same as in the case of FIG. At this time, the above signal is also sent to the set terminal S of the flip-flop F/F, which is set, and the output of the terminal Q changes from 0 to 1, indicating that simultaneous transmission is not performed.

This output 1 is negated and input as 0 to one input terminal of the AND gate AG2, so the AND gate AC2 becomes non-conductive. Therefore, in the last time slot of frames F, .
The signal output from the simultaneous transmission command terminal w of Co is blocked by the AND gate AG2, and the AND gate AGi for communication,
AG°C is not conductive and no simultaneous transmission messages are transmitted. Immediately thereafter, the frame pulse FP sent from the counter CTR reaches the reset terminal R of the flip-flop F/F and resets it. Therefore, in the next frame as well, the call signal is transmitted in the same manner as described above, and the call continues in the same manner without interference. However, when the telephone conversation at telephone SUB ends, the signal sent from terminal 1 of decoder DECo in time slot t disappears, as shown in frame F3 of FIG. 4a.

Therefore, at this time, the flip-flop F/F is not set, and the output of its terminal Q remains 0. In other words, it is displayed that simultaneous transmission will be performed. Since this output 0 is negated and input as 1 to one input device of AND gate AG2, AND gate AG2 is in a conductive state. Therefore, in time slot tw, when a signal is sent from the simultaneous transmission command terminal w of decoder DECo, this signal 1
It reaches the AND gate AGi for communication via the AND gate AG2 and the OR gate OG2, and makes it conductive. At this time slot tw', the message information for simultaneous transmission passes through this speech gate AGi, and the telephone set SU
Reach B. Therefore, when the user goes off-hook on the telephone SUB, this message, for example, a message reporting abnormal neck pain, is opened. - For non-calling telephones, no time slot is assigned for a call, i.e., as shown in frame F3 of Figure 4a, there is no time slot assignment, so when the telephone goes off-hook, it is immediately ready for simultaneous transmission. I hear the message.

Note that for important subscribers who do not transmit the aforementioned simultaneous messages, such as the police and fire departments, the flip-flop F/F of the subscriber circuit is removed or a separate switch means is installed to provide a corresponding It is possible to prevent simultaneous transmission by controlling the flip-flop F/F so that it is always set, that is, in a state that indicates that simultaneous transmission will not be performed.

The present invention, as explained above, provides an economical means for simultaneously transmitting messages for simultaneous transmission, such as information such as abnormal low hour announcements, to a plurality of subscribers in a time division switch. There are benefits to be gained.

At that time, it is possible to select the subscribers to whom the above information will be sent simultaneously on the communication back end unit, and while subscribers who are not on a call will immediately switch to simultaneous transmission, the information will be sent to subscribers who are on a call. On the other hand, it is possible to switch to simultaneous transmission after the call ends without interrupting or causing any other disturbance to the ongoing call.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram of a conventional time division switching system, Fig. 2 is a connection diagram of an embodiment of the present invention, Fig. 3 is a connection diagram of a different embodiment of the present invention, and Fig. 4 is an implementation of Fig. 3. It is an example operation time chart. SUB~SUB...Telephone, LC, ~LCn, LC
′, ~L〇m L〇′,...Subscriber circuit, day...
・・・Hybrid, DEC...Decoder, COD・
...Encoder, AGi, AGO, AG,,AG2・
...and gate, FOG...fan-out gate, OG...or gate, HW, ...up highway, HW2...down highway, TDSW...time division switched communication network, DEC. ,DEC,...Decoder, LNM...Subscriber number holding memory, CTR...Counter, F/F...
・Flip Flop, OG, ...Orgate, AN...
Announcement device Figure 1 Figure 3 Figure 4 Figure N Ship

Claims (1)

[Claims] 1 A time division highway that carries call information received by each of a plurality of telephones housed in a time division exchange.
means for displaying on the subscriber circuits of the above-mentioned telephones whether or not simultaneous transmission is to be carried out; A gate means is provided to generate an output when simultaneous transmission commands synchronized with the time slots assigned to the simultaneous transmission message information are present, and the simultaneous transmission commands are sent to the subscriber circuits of all subscriber telephones, and A simultaneous transmission system characterized in that conduction control of a speech gate is controlled by the output of the gate means in the circuit.