JPH04339432A - Low-speed multiple communicating system - Google Patents

Abstract

PURPOSE:To dispense with the queuing of communication by allowing the communication request of a new call even when the line is busy. CONSTITUTION:Communication controllers A31-A34 and B31-NB34 to generate an idle channel on a line by reducing the communication speed of a call which performs the low-speed multiplexing already and control circuits A40 and B40 to perform the low-speed multiplexing of a new call for the idle channel generated by the communication controllers A31-A34 and B31-V34 are equipped. When the communication request of the new call is received in the non-idle condition on a low-speed multiple line 38, the communication speed of other terminal is reduced by either of the communication controllers A31-A34 and B31-B34 and the idle channel is generated on the line 38. By using the channel, the low-speed multiplexing of the new call is performed by the control circuits A40 and B40 and the communication is allowed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex communication system for low-speed data terminals in digital electronic exchanges.

0002

2. Description of the Related Art As a conventional low-speed multiplex communication system, the one shown in FIG. 2 is known. FIG. 2 is a block diagram showing a conventional low-speed multiplex communication system.

[0003] In the figure, A1 to A5 are each terminal of one terminal group (one terminal group A), and B1 to B5 are each terminal of another terminal group (the other terminal group B). . One of the terminals A1 to A5 is connected to each communication control device A11 to A1, respectively.
5 and is accommodated in the digital exchange A16. Each of the other terminals B1 to B5 is connected to each communication control device B11.
~B15 and is accommodated in the digital exchange B16. A17 is a low-speed multiplexing device on the terminal group A side, which is accommodated in the digital exchange A16 and is connected to each communication control device A11 to A15.
It has the function of low-speed multiplexing of terminal information input through the terminal. B17 is a low-speed multiplexer on the terminal group B side, which, like the low-speed multiplexer A17 on the terminal group A side, is housed in the digital exchange B16 and has a function of low-speed multiplexing terminal information input through each communication control device B11 to B15. have The low-speed multiplex devices A17 and B17 are connected by a low-speed multiplex line 18, and the terminals in terminal group A and terminal group B communicate with each other. This low-speed multiplex line 18 has a low-speed multiplex function for four terminals.

In FIG. 2, a terminal A1 and a terminal B1, a terminal A2 and a terminal B2, a terminal A3 and a terminal B3, a terminal A4 and a terminal B4 are communicating between the offices of each digital exchange A16 and B16, respectively. A5 and terminal B5 are in an empty state. When terminal A5 communicates with terminal B5, if four other terminals are already communicating as in the state shown in FIG. Even if the terminal performs outgoing processing, it will be disconnected due to the communication line being busy, so either the terminals A5 and B5 will wait until the low-speed multiplex line becomes empty, or each terminal A5 and B5 will be connected to another line other than the low-speed multiplex line 18.

[0005]

[Problems to be Solved by the Invention] However, in the conventional multiplex communication system, if the low-speed multiplex line 18 is occupied due to use at the limit of processing capacity, terminal information is newly multiplexed onto the low-speed multiplex line 18. Therefore, there is a problem in that a terminal requesting low-speed multiplex communication must wait for a busy line or communicate using another line.

The present invention has been made in consideration of the above problems, and is a low-speed multiplex communication system that enables low-speed multiplexing of new calls even when the line is blocked by controlling the communication speed. The purpose is to provide

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention, in an electronic exchange having a low-speed multiplexing function, slows down the communication speed of a call that is already being low-speed multiplexed, so that a call can be transferred on the line. The present invention is characterized by comprising a deceleration means for creating an empty channel, and an empty channel multiplexing means for performing low-speed multiplexing of a new call on the empty channel created by the deceleration means.

[0008]

[Operation] According to the above structure, when a new outgoing call is performed in a state where the line is blocked, the deceleration means reduces the communication speed of the call that has already been low-speed multiplexed, thereby creating an empty channel on the line. Next, the empty channel multiplexing means performs low-speed multiplexing of a new call on the empty subchannel created by the speed reduction means. This allows new calls to be multiplexed at low speed even when the line is blocked.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 3 to 6.

FIG. 1 is a block diagram showing a connection example of the low-speed multiplex communication system of this embodiment. The overall configuration of this embodiment is almost the same as that of the conventional example, but in this embodiment, the case where the number of terminals is four will be explained as an example. To outline the overall configuration based on FIG. 1, each terminal A21 to A24 on the terminal group A side
are accommodated in the digital exchange A36 through the communication control devices A31 to A34, respectively. Each of the terminals B21 to B24 on the terminal group B side is connected to each communication control device B31 to B24, respectively.
It is accommodated in digital exchange B36 through B34. The low-speed multiplexer A37 on the side of terminal group A is digital exchange A.
A low-speed multiplexer B37 on the terminal group B side is accommodated in the digital exchange B36. The low-speed multiplex devices A37 and B37 are connected by a low-speed multiplex line 38, and the terminals in the terminal groups A and B communicate with each other. The low-speed multiplex line 38 has a low-speed multiplex function for three terminals.

Furthermore, each digital exchange A36, B3
6 are provided with control circuits A40 and B40, respectively. These control circuits A40 and B40 are connected to each communication control device A31 to A34 via out channels 52 and 66.
, control of B31 to B34, connection control of each communication path, and synchronization control of low-speed multiplexing devices A37 and B37 performed via an out channel (only the out channel 55 of communication control device A33 is shown in FIG. 1). In addition to having
It has a function as an empty channel multiplexing means that controls the digital exchanges A36 and B36 themselves and the low-speed multiplexing devices A37 and B37 to perform low-speed multiplexing of a new call on an empty channel, which will be described later.

[0012] In FIG. 1, terminal A21 and terminal B21, terminal A22 and terminal B22, terminal A23 and terminal B
23 is communicating between the stations of each digital exchange A36 and B36, and terminal A24 and terminal B24 are in an empty state.

[0013] Each communication control device A31 to A34, B31 to
B34 is configured as shown in FIG. Note that the communication control devices A31 to A34 and B31 to B34 all have the same configuration, and in FIG. 3, the communication control device A33 of the terminal A23 will be explained as an example.

Reference numeral 41 denotes a terminal interface, and this terminal interface 41 is connected to the transmission/reception data 42 which is the user information of the terminal A23, the transmission/reception clock 43 which is the clock for transmitting the transmission/reception data 42, and one communication control device A33 or the terminal A23. control data 44 that notifies the other party of the state of the
is connected between the terminal A23 and the internal equipment of the communication control device A33. 46 is a clock generation circuit that generates a transmission/reception clock 43, supplies this transmission/reception clock 43 to the terminal A 23 via the terminal interface 41, and generates the transmission/reception data 4.
2. Controls the speed (communication speed). 47 is a communication control circuit, which has a function of controlling the speed switching of the transmitting/receiving clock 43 under the control of the control circuit A40, a terminal interface 41,
It has functions such as controlling a data transmitting/receiving circuit 48 and an exchange interface 49, which will be described later. 48 is a data transmitting/receiving circuit that matches the low-speed data of the terminal A 23 with the data rate (64 kb/s) of the exchange and also performs the reverse process. 49 is a switch interface, which is a communication control device A.
33 and a digital exchange A36. The clock generation circuit 46 and the communication control circuit 47 constitute a deceleration means.

[0015] Here, the communication speed of terminal A23 is twice the communication speed of other terminals A21, A22, and A24.

FIG. 4 shows that low-speed data from each terminal A21 to A24 input to a low-speed multiplexer A37 is transmitted to each communication control device A.
31 to A34 show an example of the data structure on one time slot matched to the exchange data rate. In FIG. 4(A), low-speed data from terminal A21 is transmitted to communication control device A.
Figure 4(B) shows the data structure on one time slot matched to the exchange data rate by Terminal A.
4(C) and (D) show the data structure of the low-speed data of terminal A22 on one time slot, and FIG. 4(E) shows the data structure of low-speed data of terminal A23 on one time slot.
) respectively indicate the data structure of the low-speed data of the terminal A24 on one time slot. In FIGS. 4A and 4B, each low-speed data is aligned to the positions of bits 6 and 7, and bits 0 to 5 are empty data. In Figure 4(C),
The communication speed of terminal A23 is higher than that of other terminals A21, A22, A2
Since the communication speed is twice the communication speed of bit 4, low-speed data is
The bits 0 to 3 are empty data. FIG. 4(D) shows a state in which the communication speed of the terminal A23 is reduced to one-half and the low-speed data is aligned with the positions of bits 6 and 7. Furthermore, in FIG. 4(E), the low-speed data of terminal A24 is aligned to bits 6 and 7, and bit 0
~5 is empty data.

FIG. 5 also shows how data (data on the low-speed multiplex line 38) in one time slot is multiplexed by the low-speed multiplexer A37 on the matching data of the three terminals A21 to A23 and sent to the digital exchange B36. A configuration example is shown. Specifically, in FIG. 5(A), each terminal A21 to A2
4 matching data are shown in Figures 4 (A), (B), and (C), respectively.
FIG. 5(B) shows an example of a configuration in one time slot multiplexed in the state shown in FIG. Fig. 5 (D) shows an example of the configuration in one time slot in which the number of minutes (state shown in Fig. 4 (D)) is reached and an empty channel (empty subchannel) is created in bits 6 and 7.
C), the terminal A24 is connected to the vacant channel that occurred in FIG. 5(B).
Examples of configurations in one time slot in which consistent data of

Next, an example of operation will be shown. In addition, here, Figure 1
An example will be described in which the terminals A21 to A23 on the terminal group A side and the terminals B21 to B23 on the terminal group B side communicate with each other, as shown in FIG. It is also assumed that terminals A24 and B24 have high priority.

Data from each terminal A21 to A23 is processed by each communication control device A31 to A33, and the data is processed by each communication control device A31 to A33.
B) and (C). The matched data is multiplexed by the low-speed multiplexer A37, configured into one time slot as shown in FIG. 5A, and sent to the terminal group B side. The low-speed multiplexer B37 that received the data then
This data is decomposed, converted into various formats, and transmitted to each terminal B21-B23 via digital exchange B36 and each communication control device B31-B33.

At this time, when the terminal A24 issues a call request, the control circuit A40 determines the priority order and changes the communication speed of the other terminals according to the priority order. Here, a case will be explained based on FIG. 6, taking as an example a case where the communication speed changing process of the terminals A23 and B23 is performed. Terminal A24 at 51 during communication
When receiving a call request from the communication control device A 33 , a communication speed change request 53 is sent to the communication control device A 33 via the out channel 52 . The communication control device A33 issues a communication temporary stop request 54 to the terminal A23 via the control data 44,
In-channel 56 for the opposing communication control device B33
A communication speed change request 57 is sent to the terminal B23, and the communication control device B33 issues a communication temporary stop request 58 to the terminal B23. Thereafter, the transmission/reception clock 43 is generated by the clock generation circuit 46 controlled by the communication control circuit 47 of the communication control device A33.
speed is halved. With this operation, communication control device A
The data of the terminal A23 that is matched in step 33 changes from the configuration in FIG. 4(C) to the configuration in FIG. 4(D). As a result, the data structure of one time slot in the low-speed multiplexer A37 is as shown in FIG.
From (A) to FIG. 5(B). Note that this operation is similarly performed on the terminal group B side.

Thereafter, the communication control device A33 sends a communication speed change completion notification 60 to the communication control device B33 via the in-channel 56, and the communication control device B33 similarly changes the communication speed to the communication control device A33. Change completion notification 6
Sends 1.

The communication control device A33, which has received the communication speed change completion notification 61 from the communication control device B33, cancels the communication temporary stop request 54 and sends a communication start request 62 to the terminal A23. In addition, communication control device B33
Similarly, the communication temporary stop request 58 is canceled and a communication start request 63 is sent.

Next, the communication control device A33 connects the out channel 5 to the control circuit A40 of the digital exchange A36.
2, a communication speed change completion notification 64 is sent out. Similarly, in the communication control device B33, the digital exchange B
A communication speed change completion notification 67 is sent to the control circuit B40 of 36 via the out channel 66.

[0024] Through the above operations, terminal A23 and terminal B2
The data structure of one time slot on the low-speed multiplex line 38, which is transmitted in each direction between terminal group A and terminal group B, with the communication speed between terminal group A and terminal group B being halved, is shown in FIG. (A
), bits 6 and 7 become empty (empty channel) as shown in FIG. 5(B).

[0025] Communication speed change completion notifications 64 and 67
The control circuits A40 and B40 in the received digital exchanges A36 and B36 currently have free channels for 2 bits in one time slot in the data configuration on the low-speed multiplex line 38, and can match with 2 bits. Recognize that low-speed multiplexing is possible if the terminal has a communication speed. Then, in response to the transmission request from the terminal A24, the control circuit A40 responds to the call request from the terminal A24.
By processing similar to the normal low-speed multiplex transmission processing, a communication path is established between each terminal A24 and terminal B24 using an empty channel, and a communication state is established.

As described above, when a new call communication request is received while the low-speed multiplex line 38 is blocked, the communication speed of other terminals is slowed down to create an empty channel on the line, and this channel is used. Since a new call is low-speed multiplexed, a new call communication request can be accepted even when the low-speed multiplex line 38 is busy, and communication waiting can be eliminated.

Furthermore, even when there is no free channel on the low-speed multiplex line 38, there is no need to use another line, and operation costs can be reduced.

[0028] In the above embodiment, the case where each terminal group A and B is provided with four terminals was explained as an example, but even if five or more terminals are provided, the same functions and effects as in the above embodiment can be obtained. can play.

Furthermore, in the embodiment, two terminal groups A,
The explanation was given using communication between B as an example, but even if there are three or more,
The same functions and effects as described above can be achieved between two groups of terminals that communicate with each other.

[0030]

[Effects of the Invention] As detailed above, according to the present invention,
A deceleration means for creating an empty channel on a line by decelerating the communication speed of a call that has already been low-speed multiplexed, and an empty channel multiplexing means for low-speed multiplexing a new call on the empty channel created by the deceleration means. When a communication request for a new call is received when there is no free space on the line, the deceleration means slows down the communication speed of the call that is performing low-speed multiplexing, creates a free channel on the line, and uses this channel. Since new calls are multiplexed at low speed using the free channel multiplexing means, new call communication requests can be accepted even when the line is busy, and communication waiting can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a connection example of a low-speed multiplex communication system according to the present embodiment.

FIG. 2 is a block diagram showing a connection example of a conventional low-speed multiplex communication system.

FIG. 3 is a block diagram showing the configuration of a communication control device.

FIG. 4 is an explanatory diagram showing the structure of one time slot of data from a communication control device input to a low-speed multiplex device.

FIG. 5 is an explanatory diagram showing an example of the data structure of one time slot on a low-speed multiplex line.

FIG. 6 is an operation sequence diagram showing communication speed change processing between terminals.

[Explanation of symbols]

A21-A24 Terminals B21-B24 Terminals A31-A34 Communication control devices B31-B34 Communication control devices A36, B36 Digital exchanges A37, B3
7 Low-speed multiplex device 38 Low-speed multiplex line A40, B40 Control circuit 46 Clock generation circuit 47 Communication control circuit

Claims (1)

[Claims] Claim 1: In an electronic exchange having a low-speed multiplexing function, a deceleration means for creating an empty channel on a line by decelerating the communication speed of a call that is already performing low-speed multiplexing, and and empty channel multiplexing means for low-speed multiplexing new calls.