JPS63240141A - Transmission system for control information of multiplexer - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a line by detecting a data signal level from a low speed line and sending the signal while being multiplexed onto a signal of a high speed digital line after the signal level goes to a set value or below when an instruction comes from a control section to send a control signal. CONSTITUTION:When a voice signal is sent to a low speed line 1a, the voice signal is inputted to a voice signal coder 3 and a voice level detection section 4. The voice signal inputted to the coder section 3 is converted into a digital signal subjected to band compression and the result is sent to a switch section 5. When an instruction comes from the control section 8 to send a control signal, a timing control section 10 gives the instruction of changeover to a changeover section 5 at the detection signal level of the detection section 4 going to the set value or below, the control signal is multiplexed in place of the data signal and the result is sent to a high speed digital line 7a. The multiplex signal received from the high speed digital line 7b is inputted to a switch section 11, and the control signal is sent to the control section 8 when the signal is judged to be the control signal. Thus, the line utilizing efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a control information transmission system for a multiplexing device in an information communication network system.

(Prior art) A multiplexing device in an information communication network system is
Various data signals such as facsimile signals and voice signals transmitted from terminal devices via low-speed lines are multiplexed and sent to high-speed digital lines, and the multiplexed signals from the high-speed digital lines are separated and transmitted to low-speed lines. Send to line.

In addition, dedicated control signals such as fault information, remote control information, and information regarding network management of the information communication network system are transmitted and received between multiplexing devices via high-speed digital lines.

The conventional control information transmission method of a multiplexing device in the above-mentioned information communication network system has a band for sending data signals from a terminal device to a high-speed digital line, as well as a band for sending the control signal to a high-speed digital line. For example, a specific bandwidth of 8 Kbps was required.

Therefore, since it is necessary to always keep the specific band exclusively, the band for the data signal is limited, resulting in low line usage efficiency.

(Problems to be Solved by the Invention) As described above, the control information transmission method of the conventional multiplexing device described above transmits and receives data signals from the terminal device between the band for sending out to the high-speed digital line and the multiplexing device. A bandwidth is required to send control signals to a high-speed digital line.
There was a problem that the line usage efficiency was low.

Therefore, the present invention eliminates this problem and provides a control information transmission method for a multiplexer that can improve line usage efficiency by transmitting control signals using the band for transmitting data signals. The purpose is to provide.

[Structure of the invention]

(Means for Solving the Problems) The control information transmission method of the multiplexing device of the present invention multiplexes data signals from a low-speed line or control information signals from a control unit and sends them to a high-speed digital line, and In a control information transmission method for a multiplexing device that separates a transmission signal from a high-speed digital line and sends a data signal to the low-speed line, the signal level of the data signal from the low-speed line is detected, and the control from the control unit is performed. When there is an instruction to transmit an information signal, in response to the instruction, the control information signal from the control section is multiplexed instead of the data signal after the signal level becomes equal to or less than a preset value. and transmits the signal to the high-speed digital line, and when it is determined that the transmission signal from the high-speed digital line is a control information signal, the control information signal is received and input to the control section.

(Function) In the control information transmission system of the multiplexing device of the present invention, when there is an instruction from the control unit to transmit a control information signal, in response to this, the signal level of the data signal is determined to be below a preset level. After that, the control information signal from the control section is sent to the high-speed digital line instead of the data signal. Further, if the transmission signal from the high-speed digital line is information indicating a control information signal, the control information signal is received and read out by the control section.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a multiplexer showing an embodiment to which the control information signal transmission system of the multiplexer of the present invention is applied. In the figure, the multiplexing device has a configuration in which a control section 8, an audio signal adapter 2, an audio signal adapter 15, a data signal adapter 16, etc. are connected to a multiplexing and line interface section 6. The multiplexing and line interface section 6 and each of the signal adapters are controlled by a control section 8.

FIG. 2 shows a timing chart of each signal that operates during transmission in implementing this embodiment, where signal a is an audio signal as a data signal, and signal a is a detection output signal of the audio level section 4. C is a control input signal for the switching section 5, signal d is a switching request signal from the control section 8, signal e is a control signal sent from the control section 8 to the buffer memory 9, and signal f is a control signal sent from the buffer memory 9 to the switching section 5. Each of the control signals to be sent out is represented.

The operation of this embodiment will be explained using FIGS. 1 and 2.

First, when an audio signal is sent to the low-speed line 1a at time T1 shown in FIG. The signal is input to the detection unit 4. This audio level detection section 4
outputs a high level (hereinafter referred to as "H") to the timing control unit 10 at the time t1 when the audio signal is input. Note that the audio level detection section 4 constantly detects whether or not audio information is present on the audio signal line. Furthermore, the audio signal input to the audio signal encoding section 3 is converted into a band-compressed digital signal and sent to the switching section 5. The changeover switch of the changeover unit 5 is set so that the audio signal is transmitted with priority, and is connected to the contact S on the audio signal side. Therefore, the digital signal input to the switching unit 5 is multiplexed and the line interface unit 6
The multiplexing and line interface section 6
The signals are multiplexed and sent to the high-speed digital line 7a.

Now, suppose that it becomes necessary to transmit a control signal from the control section 8, which controls the entire multiplexing apparatus, to the other multiplexing apparatus at time t2 shown in FIG.

In this case, the control unit 8 requests “H” to request switching at time t2.
” signal (see d shown in FIG. 2) to the timing control unit 1o, and a control signal such as HDL
All frames in the C procedure send frames 1 to 3 (see C in FIG. 2) to the buffer memory 9.

At the same time as receiving the "H" switching request signal, the timing control section 10 determines whether or not audio information is present in the detection output signal from the audio level detection section 4 (see b shown in FIG. 2). If it is determined that the audio information does not exist, it instructs the switching unit 5 to switch the changeover switch to contact C on the control signal side. The timing control unit 10 controls the detection output signal of the detection unit 4 to be H at time t2.
', it is determined that audio information exists and does not instruct the switching unit 5 to switch. Then, the timing control section 10 determines that the detection output signal of the detection section 4 changes from "H" to low level (hereinafter referred to as "L") at time t3 (see b shown in FIG. 2), and there is no audio information. Even if it is determined that
A switching instruction is given to the switching unit 5 at step C shown in the figure.

Here, the hangover time Th is to interrupt the control signal without significantly deteriorating the call quality, and when switching from the voice signal side to the control signal side, it is necessary to wait at least several hundred m5 after the voice signal ceases to exist. It is. Then, loss is gradually inserted into the audio signal line, and the naturalness of the conversation is ensured by confirming that there is no audio signal input exceeding the specified value even after a hangover time of several 100 a+s, and then switching over. . Now, when the switching section 5 switches the changeover switch in response to the switching instruction from the timing control section 10, the control signal inputted to the buffer memory 9 passes through the switching section 5, the multiplexing and line interface section 6, and is converted into a high-speed digital signal. It is sent to line 7a. This control signal is added with code information (part Z as shown in Figure 2) indicating that it is control information (second
For example, in the HDLC procedure, data is transmitted in frame units.

By the way, while the control signal is being transmitted, the detection output of the detection unit 4 changes from "L" to "H" at time t5 and interrupts frame 2 (see b shown in FIG. 2) (see f shown in FIG. 2). In this case, the timing control unit 10 causes the transmission to continue until frame 2 ends transmission I, and instructs the switching unit 5 to switch the changeover switch to contact S at the same time as the transmission of frame 2 ends at time t6. do. Switching section 5
switches the changeover switch to the contact S in response to an instruction from the timing control section 1o. Note that one frame of the control signal is set to several tens of meters or less, so as not to greatly affect the rise of the audio signal. In addition, if all frames of the control signal, for example, frame 3 out of frames 1 to 3, cannot be transmitted, it is confirmed that the audio signal is absent at time t7 (see b shown in Figure 2), and a hangover is detected. At time t8 after time Th has elapsed (see C in FIG. 2), frame 3 is transmitted (see f in FIG. 2).

Next, a case will be described in which a control signal from the other multiplexer is received.

First, a transmission signal manually input to the audio signal adapter 2 via the multiplexing and line interface section 8 from the high-speed digital line 7b is input to the switching section 11, and is also input to the audio signal/control signal determining section 13. This switching unit 11 includes a contact S on the audio signal side and a contact C on the control signal side,
The changeover switch is connected to contact S. As a result, the transmission signal input to the audio signal adapter 2 is input to the audio signal decoding unit 12 via the switching unit 11, subjected to digital/analog conversion, and then sent to the low-speed line 1b as an analog audio signal.

However, when the audio signal/control signal determination unit 13 determines that code information indicating a control signal is added to the input transmission signal, it sends a notification that a control signal is being transmitted to the timing control unit 10. . Then, the timing control section 10 instructs the switching section 11 to switch the changeover switch to the contact point C. By switching the switching unit 11 in response to this, the control signal is transferred to the switching unit 1.
1 and then manually inputted into the buffer memory 14. When the buffer memory 14 sends a notification that the control information has been written to the control section 8, the control section 8 reads out the control information and recognizes the control information from the other multiplexing device.

〔Effect of the invention〕

As explained above, the present invention detects a data signal level, and when an instruction to transmit a control signal is received from the control unit, when the signal level becomes a preset value or less, Line usage efficiency can be improved without requiring a band for the control information signal from the control unit. Another advantage is that the system design becomes easier when constructing an information communication network system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a multiplexer showing an embodiment to which the control information transmission method of the multiplexer of the present invention is applied, and Fig. 2 is a timing chart of each signal operated during transmission in implementing this embodiment. This is what is shown. la, lb: low-speed line, 2: audio signal adapter, 3: audio signal encoder, 4: audio level detector, 5.11: switching unit, 6: multiplexing 7a, 7b...High-speed digital line, 8...Control unit (CPU), 9.14...Buffer memory, 10...Timing control unit, 12
...Audio signal decoding section, 13...Audio signal/control signal determination section, 15...Audio adapter, 16...Data signal adapter. First cause d, υ ゛ri Φ
ni～〆＝、

Claims (1)

[Claims] A data signal from a low-speed line or a control information signal from a control unit is multiplexed and sent to a high-speed digital line, and a transmission signal from the high-speed digital line is separated to transmit the data signal to the low-speed line. In the control information transmission method of the multiplexing device, the signal level of the data signal from the low-speed line is detected, and when there is an instruction from the control section to transmit the control information signal, in response to the instruction to transmit the control information signal, After the signal level reaches a preset value or more, the control information signal from the control unit is multiplexed instead of the data signal and sent to the high-speed digital line, and the transmission signal from the high-speed digital line is transmitted. 1. A control information transmission system for a multiplexing device, characterized in that when it is determined that the control information signal is a control information signal, the control information signal is received and inputted to the control section.