JPS612454A - Multiple exchange system - Google Patents

Abstract

PURPOSE:To increase the number of wide band media terminals allowed to use a repeating circuit by forming a monitoring means for comparing the number of using channels of the repeating circuit of a switchboard with a prescribed value and a speed changing means for changing a transmission speed, and when the number of using channels of the repeating circuit exceeds the prescribed value, reducing the transmission speed of a wide band access. CONSTITUTION:An identification circuit 19 in a monitoring device 18 discriminates the number of using channels of the high speed repeating circuit 8 and a comparator 20 compares the discriminated result with the prescribed number of using channels. When the current number of using channels is larger than the prescribed number of channels, a control signal is sent from the comparator and inputted to a selector 23 in each wide band access media terminal 16. When a speed variable control part 24 in the terminals 16 sends transmission information by a driver 21 having 32Mbps transmission speed, the selector 23 switches the current driver 21 to a driver 22 having 16Mbps transmission speed on the basis of the instruction from the comparator 20 to transmit the information. When the comparator 20 detects that the number of using channels of the repeating circuit 8 drops less than the prescribed value, the comparator 20 sends a control signal to switch the driver 22 to the driver 21.

Description

[Detailed Description of the Invention] +8+Field of Industrial Application The present invention provides a multiplexing method for wideband calls and narrowband calls when switching and processing the wideband calls and narrowband calls at the same time, and a method for multiplexing broadband calls and narrowband calls using this multiplexing method. The present invention relates to a multiple switching method for switching multiplexed broadband calls and narrowband calls.

Against the backdrop of the era of the advent of new media.

Broadband media such as high-speed facsimile, high-speed file-to-file transfer, and image transfer are occupying an increasing proportion of communication networks. It is desired that these wideband media be efficiently integrated within a communication network with an existing voice-based narrowband media exchange system to form a new communication network.

(bl Prior Art) As mentioned above, when forming a communication network in which wideband calls and narrowband calls coexist, the following switching methods can be considered.

First, as a first method, a method can be considered in which switching processing is performed uniformly for each narrowband call. For example, a narrowband call of 2MB/S or less, and a wideband call of 32MB/S or less.
In the case of S, 16 time slots of a narrowband call are allocated to one time slot of a wideband call.

As a second method, a method can be considered in which unified switching processing is performed on a broadband call basis. In this case, speed conversion is required to match the transmission speed of the narrowband call with the transmission speed of the wideband call.

(C1 Problem to be Solved by the Invention In the first method described above, 16 multi-slot exchanges are performed for broadband calls, and the number of occurrences of broadband calls increases.
Efficient switching processing including wideband calls and narrowband calls cannot be realized, and the call loss rate on 9 communication paths increases, and both wideband calls and narrowband calls are busy (blocking phenomenon).
It becomes easier to do.

Furthermore, in the second method, all communication paths need to be constructed using high-speed devices. Furthermore, increasing the multiplicity of highways requires faster devices, and it is practically impossible to increase the multiplicity that much. As a result, the call loss rate on the communication path worsens. Furthermore, it is impossible to transmit narrowband calls directly on the transmission path at low speed.

In order to significantly reduce the transmission utilization, it is necessary to convert the transmission rate of narrowband calls to the transmission rate of broadband calls, as described above.

As described above, in each method, in order to efficiently exchange and process wideband calls and narrowband calls, the number of parts increases, high-speed devices are required, and complicated control is required to preserve order. There was a problem with being exposed. The present invention aims to solve these problems.

(d) Means for solving the problem Therefore, in the present invention, the present invention includes a monitoring means for comparing the number of used channels of the trunk line of the exchange with a specified value, and a transmission speed of the broadband call according to the comparison result of the monitoring means. and speed converting means for changing the transmission speed of the wideband call when the number of channels used on the trunk line exceeds the specified value.

te1 effect By lowering the transmission speed of broadband calls, the number of channels occupied by one broadband call is reduced and the number of broadband media terminals that can utilize the trunk line is increased.

ff) Example An embodiment of the present invention will be described below with reference to the drawings.

Explain in detail. FIG. 1 is a block diagram of a multiple exchange system showing one embodiment of the present invention. In the same figure,
1 is a narrowband communication path, and therein there is a narrowband communication path switching function unit 2. and wideband call and narrowband call demultiplexing function unit 3
is provided. The switching function section 2 exchanges and connects narrowband calls (voice handwritten data, etc.) sent from narrowband media terminals within its own station via the concentrator multiplexing section 5, and in the case of connections within its own station, it It is connected to a narrowband media terminal via the separation unit 3. This multiplexing/demultiplexing function section 3 is designed to perform both transmitting and receiving functions.

Narrowband calls directed to other stations are handled by switching function unit 2. Demultiplexing function section 3. It is connected to other stations via a trunk line 8, which is a high-speed multiplex line. Further, a wideband call/narrowband call multiplex termination line 9 extends from the external office to the multiplex/demultiplex function section 3.

Broadband communication path 1 having a broadband communication path switching function section 10
1 exchange function section 10 includes a serial/parallel converter 12.degree. memory 13.
Serial-to-parallel converter 14. A wideband media terminal 16 is connected to the serial/parallel converter 12 via a concentrator/multiplexer 15, and a wideband outbound call line 17 from the multiplexer/demultiplexer 3 is connected to the serial/parallel converter 12. The wideband outcall station connection output 10A of the demultiplexing section 7 is connected to the demultiplexing function section 3.

Wideband call local connection output 1. The OB is connected to a broadband media terminal via a demultiplexer. Furthermore, a monitoring device 18 for monitoring the channel usage status of the high-speed relay line is connected to the multiplexing/demultiplexing function section 3.

The monitoring device 18 has an identification circuit 19 that identifies the number of channels used.
A comparison circuit 20 is provided for comparing the number of channels identified by the identification circuit 19 with a prescribed number of channels. Each broadband media terminal 16 also includes a respective variable speed control 24. The speed variable control unit 24 controls the drivers 21, 22, . . . having different transmission speeds. It also includes a selector 23 that allocates transmission information transferred from a memory or the like to either the driver 21 or 22. The selector 23 is controlled by the comparison result from the comparison circuit 20.

Next, the operational aspects of the present invention under the above configuration will be explained.

For convenience of explanation, the frame format in the narrowband call channel 1 consists of 8 megabytes and 128 time slots (transmission rate 64 Kbps, 128 multiplexing) as shown in FIG. 2(C), and the frame format in the wideband call channel 11 is as shown in FIG. 32 meg, 32 times loft (as shown in Figure 2 (A))
The transmission speed is IMbps, 32 multiplexing). One time slot of this broadband call channel 11 is 8 bits.

If each of these band calls is to another corresponding terminal within the local station, it is connected to the other terminal within the local station via the corresponding switching function section, and necessary communications are performed.

On the other hand, if both the narrowband call and the wideband call are to outside the local station, the narrowband call is sent to the multiplexing/demultiplexing function unit 3. Further, the wideband call is divided into four parts, for example, by the demultiplexing section 7, and sent to the multiplexing/demultiplexing function section 3 with the same transmission speed as the multiplexed narrowband call. That is, a wideband call having a frame structure as shown in FIG. 2(A) is divided into four parts, and the transmission speed is further reduced to one-sixteenth, thereby converting from IMbps to 64 kbps. The frame structure of a broadband call divided into four parts and speed-converted in this manner is shown in FIG. 2(B). As a result, the frame format for narrowband calls and the frame format for wideband calls are smoothly integrated, and the multiplexing and demultiplexing function section 3 performs multiplexing of both calls. ), multiplexed broadband calls and narrowband calls are sent to the trunk line 8.

Also, broadband calls sent from an external station via trunk line 8,
In the case of a narrow band, the transmission is signaled to the demultiplexing function unit 3 via the wide/narrowband call multiplexing incoming line 9, and the demultiplexing function unit 3 performs demultiplexing and separation. During the narrow band obtained in this way, the switching function section 1 is transmitted through a multiplexing section (not shown).
Transferred to 0. Each switching function section 2.10 sends the narrowband call and wideband call separately to the narrowband call demultiplexing section and the wideband call demultiplexing section within the own station. The narrowband call is sent to the destination narrowband call media terminal, and the broadband call is sent to the destination broadband call media terminal.

Further, a monitoring device 18 for monitoring the channel usage status of the high-speed trunk line 8 is connected to the demultiplexing function section 3. The identification circuit 19 of the monitoring device 18 identifies the current number of channels in use on the high-speed trunk line 8, and the comparison circuit 20 compares it with the specified number of channels in use. If the number of channels currently in use is greater than the specified number of channels, a control signal is sent from the comparison circuit and input to the selector 23 of each broadband call media terminal.

The speed variable control unit 24 of the broadband call media terminal 16
When transmitting information is being sent by the driver 21 having a transmission rate of Mbps, the selector 23 switches to the driver 22 having a transmission rate of 16 Mbps according to an instruction from the comparison circuit, and transmits the information. Further, the comparison circuit 20 is connected to the high-speed trunk line 8.
When it is detected that the number of used channels has become less than the specified value, a control signal is sent to the selector 23 to switch to the 32 Mbps driver 21.

For example, the transmission speed for narrowband calls is 64Kbps + the transmission speed for wideband calls is 2Mbps, and the transmission speed for trunk lines is 32Mbps.
Assume bps. At this time, 512 channels can be connected if trunk lines are used only in narrowband.

When used only for broadband calls, only 16 channels can be connected. In other words, for one wideband call channel, three narrowband calls
Two channels will be used. Also narrowband call 161
If a trunk line is used for 10 channels and broadband calls, the number of channels used in narrowband mode becomes 481 channels, making it impossible to connect the primary broadband call.

However, if the transmission speed of wideband calls is reduced to one half, 16 channels of narrowband calls will be used for one channel of wideband calls, so the number of used channels will be 321 channels, and the number of channels used will be 321 channels. It becomes possible to connect broadband calls that occur in

In this way, wideband calls and narrowband calls that are multiplexed and sent and received via trunk lines are not unified into narrowband calls or wideband calls as in the past, and the utilization efficiency of the high-speed digital line that is the trunk line is important. While maintaining.

Can send and receive broadband calls and narrowband calls.

(g) Effects of the invention - As explained above, according to the present invention, by reducing the transmission speed of broadband calls, even if the number of used channels of the trunk line is full, newly generated broadband calls can be processed. This has the effect of improving trunk line usage efficiency and improving services to broadband call media terminals.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an example of a frame format used to explain the embodiment of FIG. 1. In the figure, 1 is a narrowband communication path, 2 is a narrowband communication path switching function unit, a multiplexing/demultiplexing function unit, 7 is a separation unit, 8 is a trunk line, 10 is a wideband communication path switching function unit, and 11 is a broadband communication path Road, 18
24 is a monitoring device, and 24 is a speed variable control section.

Claims (1)

[Scope of Claims] A multiplex switching system equipped with an exchange that simultaneously processes narrowband calls and wideband calls, comprising: monitoring means for comparing the number of used channels of a trunk line of said exchange with a specified value; and said monitoring means. speed converting means for changing the transmission speed of the wideband call according to the comparison result, and the transmission speed of the wideband call is reduced when the number of channels used in the trunk line exceeds the specified value. Multiple exchange method.