JPH01311663A - Toll dialing network - Google Patents

Abstract

PURPOSE:To improve speech quality in low traffic by using a voice coding system with the optimum efficiency corresponding to the traffic of a private line. CONSTITUTION:A traffic measuring part 18 always measures the traffic of the private line, and a main controller 20 selects a unit corresponding to the traffic by referring to reported traffic and data for the selection of coding units (12a-12c) set on a memory 10, and sends a switching signal to a switching control part 14. The switching control part 14 receiving the switching signal operates switching circuits 13a and 13b, and connects it to a corresponding unit of the voice coding units (12a-12c). In such a way, it is possible to improve the speech quality by switching a system to the voice coding system with low efficiency when allowance is provided in the capacity of the private line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a toll dial network constructed using a leased line.

[Conventional technology] Conventionally, toll-dial networks using leased lines have adopted a highly efficient voice encoding method that is sufficient for calls, in order to reduce the line cost of the leased line, and the capacity of the leased line covers the maximum amount of traffic. The decision was made in anticipation of an increase in traffic volume over the next few years, so the selection was made with a margin for normal traffic volume.

[Problems to be Solved by the Invention] However, in the conventional example described above, the voice encoding method always has a constant efficiency regardless of the amount of traffic on the leased line. On the other hand, even if there is some margin, it is not possible to switch to a low-efficiency voice coding system to improve speech quality.

[Means and effects for solving the problems] According to the present invention, there are provided a switching means for switching between audio encoding systems of different efficiencies, a control means for controlling the switching timing, and a control means for controlling the slots of a time division multiplexing device. By providing measuring means for measuring the traffic on the leased line and identification means for identifying the terminal, voice encoding systems with different efficiencies can be switched according to the amount of traffic on the leased line.

[Embodiment] FIG. 1 is a system block diagram showing a first embodiment of the present invention. In the figure, 1 is an exchange that performs exchange processing, and 2
a and 2b are telephones connected to the extension section of exchange 1; 3 is a terminal other than a telephone; 4 is a time division multiplexing device that performs multiplexing processing;
5a to 5c are extension cables of exchange l, 6 is a table for registering the types of terminals connected to the extensions of exchange l, 7 is an identification unit for identifying the type of terminal, 8 is an exchange system, and 9a
~9C is a line connecting exchange 1 and multiplexer N4, 10a,
10b is a drop-in line, 11 is a monitoring unit that monitors the connection of line i; 19a to 9c, and 12a to 12c are voice encoding unit groups that perform encoding with different efficiencies (this unit group includes lines 10a and 10bl); 1 group for trees), 1
3a and 13b are switching circuits that switch between the encoding units 12a to 13c.

14 is a control unit that switches the switching circuits 13a and 13b at the same time; 15 is a buffer that stores encoded data; 16 is a time slot; 17 is a control unit that reports the status of the time slot 16 to the main controller 20; 18 is a measurement unit that measures the amount of traffic on the leased line; 19 is a memory that sets which encoding method is to be adopted depending on the amount of traffic;
20 encodes data from various situations into encoding units 12a to 12a.
12c is the main controller that selects, 21 is the interface with the leased line, 22 is the leased line, and 23 is the exchange l.
This is a control line between the multiplexer 4 and the multiplexer 4.

Next, the switching operation of the audio encoding method in the embodiment according to the present invention will be explained with reference to FIG. 1, FIG. 3, and FIG.

In the configuration shown in FIG. 1, the traffic measurement unit 18 constantly measures the traffic volume of the dedicated line and
S1), the main controller 20 refers to the reported traffic volume and the data set in the memory 19 for selecting the encoding units 12a''-12a. The type of speech code unit to be used is set in advance.

If the reported traffic amount is within the range of the currently used encoding unit, the main controller 20 continues to wait for a traffic amount report (S2).

If the reported traffic amount is not within the usage range of the currently used coding unit, the following unit switching operation is performed.

If the amount of traffic is greater than the range of the unit currently in use, check whether there is a unit with a more efficient audio encoding method than the unit currently in use. If there is a unit that is compatible with the amount of traffic, select a unit that corresponds to the amount of traffic. Then, a switching signal is sent to the switching control section 14. Upon receiving the switching signal, the switching control section 14 operates the switching circuits 13a and 13b to connect the corresponding audio encoding units 12a to 12c (S3). If no matching unit exists, this switching operation is not performed (S2).

If the amount of traffic is smaller than the range of the unit currently in use, the presence or absence of a low-efficiency audio encoding unit is checked and a switching operation is performed (S4), similar to the operation when the amount of traffic is large.

Next, the multiplexing operation will be explained with reference to FIGS. 1, 2, and 4.

In FIG. 1, any of the terminals 2a, 2b, and 3 connected to the extension of the exchange 1 first dials the other party.

The exchange system 8 connects the multiplexer 4 and the outside line 10a according to the received dial number.

Connect to 10b etc. At this time, the terminal identification section 7 confirms the number of the calling terminal, identifies the type of terminal from the data registered in the terminal identification table 6, and the main controller 2
0 (S5). It is determined from the sent identification signal whether it is a telephone 2a, 2b or a terminal 3 other than a telephone,
In cases other than telephone calls, processing and encoding corresponding to each call is performed (S6). Voice encoding unit 1 in case of calling party or telephone
Encode the audio signal using 2a to 12c (s7)
. The encoded audio signal is stored in the -H buffer 15. Next, the main controller 20 determines the time slot 16 based on the speed of the encoded signal (S8).
. When the allocation to the time slot 16 is completed, the slot control unit 17 creates control information regarding the time slot allocation (S9), takes the data in the buffer 15 into the allocated slot, and multiplexes the control signal together with the SIO, 5ll), and transmits data to the dedicated line 22 through the dedicated line interface 21 (S12).

Figures 2a to 2C show that the voice encoding units 12a to i2c are switched due to an increase in traffic, and the communication speed is increased to nkbp.
It shows the allocation of time slot 16 when dropping from s to -kbps. When a line is in use, the coding unit switching operation is performed when the call ends, so as not to affect the call. The line monitoring unit 11 constantly monitors whether or not a call is in progress and reports it to the main controller 2o.

[Effects of the Invention] As explained above, by using a voice encoding method with optimal efficiency corresponding to the traffic volume of the leased line, it is possible to improve call quality when the traffic volume is low, and to improve the usage efficiency of the leased line. It has the effect of increasing the amount of water and making effective use of it.

[Brief explanation of the drawing]

Fig. 1 is a system block diagram of the present invention, Fig. 2 is a diagram of changes in time slot allocation when switching the audio encoding method, Fig. 3 is a flowchart of the audio encoding method switching operation, and Fig. 4 is multiplexing. It is a flowchart figure of a process. 1 is an exchange, 2a and 2b are telephones, 3 is a terminal other than a telephone,
4 is a time division multiplexer, 5.5a to 5c are extension cables of the exchange, 6 is a terminal identification table, 7 is a terminal identification unit, 8 is a line switching system, 9a to 9c are exchanges, lines between the multiplexers, 10a, 10b is a drop-in line, 11 is a line monitoring unit, 1
2a to 12c are audio encoding units, 13a and 13b are switching circuits, 14 is a switching control unit, 15 is a buffer, 16 is a time slot, 17 is a time slot l [part, 18 is a traffic measurement unit, 19 is a memory, 20 is the main controller, 21 is a dedicated line interface, and 22 is a dedicated line.

Claims (1)

[Claims] Switching means for switching between voice encoding systems of different efficiencies in a toll dial network constructed using a leased line, a control means for controlling slots of a time division multiplexer, and a method for measuring traffic on the leased line. 1. A toll-dial network comprising: a measuring means for controlling a device, a control means for controlling switching timing of devices, and an identifying means for identifying a terminal connected to the network.