JPS6172428A - Transmitter of control signal - Google Patents

Abstract

PURPOSE:To improve the multiplex efficiency of a digital transmission line by using another channel than data channels, assembling a multi-frame in the unit of envelope and transmitting control signals separately. CONSTITUTION:A data signal between a data terminal device 1 and a multiplexer 2 and a control signal of the 100 series of the CCITT recommendations via an interface IF7 and a control signal of the 200 series by the CCITT recommendations via an IF8 are transmitted. A data signal between a multiplexer 3 and a line terminator 4 and the control signal of the 100 series via an IF10 and a control signal of the 200 series between a network controller 5 and the device 3 via an IF11 are transmitted. The devices 2, 3 are connected by a digital private line 9 and the device 4 is connected to a public exchange network 6. The data signal, a transmission request RS and a control signal of carrier detection CD are transmitted in an 8-bit envelope and the other control signals are transmitted by using one channel while assembling multi-frame.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a control signal transmission device between a data terminal equipment (DTE) and a data line termination device (DC link), and particularly relates to a control signal transmission device for connecting to a public IIi network. This invention relates to the transmission of control signals that enable the interface.

In conventional digital leased lines, data signals and control signals are generally transmitted in units of 8-bit envelopes as shown in FIG. That is, the data signal D
Six bits 1 to D6 are sent out following the 7 framing bits F, and the control signal S is sent out as the last one bit. Other control signals can be transmitted following a similar envelope of 7 framing bits using a separate channel from the data frame. These envelopes are
In the case of 3.2 Kb/s per channel, 20 channels can be multiplexed into an 84 Kb/s digital θ-order group signal and transmitted. A 3.2 Kb/s channel can transmit a 2.4 Kb/3 data signal. On the receiving side, the 6 bits within the envelope are separated as data signals. This type of multi-use method is called octet multiplexing.1 For example, C:CITT Recommendation 1
In order to transmit the 007200 series W@ number,
Three channels are required to transmit data and control signals.

That is, one channel is required for transmitting and receiving data, a transmission request (RS), and a four-way detection signal (O9), and two channels are required for transmitting and receiving other control signals. The other control signals mentioned above include 1. For example, in accordance with the 100 series interface, there is a data terminal ready (ER) in the direction from the data terminal equipment DTE to the data line termination equipment DCE;
Data line terminal equipment DCE or data terminal equipment DTH
In the direction from the data terminal equipment DTE to the data line termination equipment EI DGH, there are call indication (CI), data set ready (R), clear to send (CS), etc., in accordance with the 200 series. , calling request ((:RQ)
, numeric display (DPR), numeric signal (CS+, C5
t, C54, C5t), etc., and in the direction from the data line termination device DCE to the data terminal device OTH, data line busy (LO), partner terminal connection complete (OS (:
), call abandonment (ACL), repeat call indication (RCI), next digit request (PND), power supply indication (P[), etc.

FIG. 5(A) shows data D, -06 and the above-mentioned control signal R.
5/The envelope for sending a CD is shown in the same figure (
B) are control signals CRQ/DLO, DPR/DSG.

, 4 o
s, /ACL, os, /RCI,
RoS4 /PND, OS, /PI, /
The same figure (C) shows the envelope for sending and receiving C5.
indicates the envelope for transmitting and receiving the control signals ER/CI and /R.The various control signals listed above are the control signals written to the left of the / symbol, which are the control signals transmitted from the data terminal equipment DTE to the data line termination equipment wIDCE. Yes, and the one written to the right of the / symbol indicates a control signal to be transmitted from the data line termination device DGE to the data terminal device DTE, and a blank indicates that there is no control signal to be transmitted.

As mentioned above, in the conventional control signal transmission device.

In order to send and receive control signals exceeding 7 bits in one direction,
Since two channels are required, in order to interface the data terminal equipment DTE to the public switched network, in addition to the data channel, two 3.2 Kb/s control channels are required, resulting in poor multiplexing efficiency. For example, to transmit 2.4 Kb/s data and control signals, it requires 3 times 3-2 Kb/S.

Purpose of invention The object of the present invention is to overcome the above-mentioned drawbacks of the prior art.

In addition to the data channel, it is an object of the present invention to provide a control signal transmission device capable of transmitting and receiving control signals through one channel of 3.2 Kb#, thereby improving the multiplexing efficiency of digital transmission paths.

Structure of the Invention The control signal transmission device of the present invention assembles a multiframe in units of envelopes using one channel other than the data channel in a digital leased line that performs time-division multiplex transmission of data in units of envelopes, and transmits data in units of envelopes. One of the control signals required for transmission and reception is transmitted by a data channel, and other various control signals are transmitted by the multiframe.

Embodiments of the Invention Next, one embodiment of the present invention will be described in detail with reference to one drawing.

FIG. 1 is a block diagram showing an embodiment of the present invention.

That is, the terminal device 1 and the multiplexer ElZ are connected by an interface 7 for transmitting data signals and 100 series control signals, and an interface 8 for transmitting 200 series control signals, and the multiplexer 3 The data signal between the and line termination device 4 is the control W@ of the 10G series.
It is connected to the network control device ff15 by an interface 11 for transmitting control signals of the 200 series,
2 and multiplex unit W13 are connected by digital dedicated line 9.
A line termination device (D(:E) 4 is connected to a public switched network 6.

And the data signal and control signal R5/CD.

It is transmitted using an 8-bit envelope as shown in FIG. 2(A). If the data rate is 2.4 Kb/s, one channel of 3.2 Kb/s can be used for transmission. In addition, one 3.2 Kb/s channel is used to assemble a multi-frame, and two envelopes in which the multi-frame signal MF and various control signals are arranged are alternately arranged in each frame as shown in CB) in the same figure. to be transmitted. These two envelopes allow transmission of 100 series and 200 series control signals other than the control signals RS/CD.

FIG. 3 is a block diagram showing details of the multiplexing devices 2 and 3 of this embodiment. That is, the multiplexer a2 includes a demultiplexing circuit 16, a data demultiplexing circuit 17, a control signal demultiplexing circuit 18, and a multiframe synchronization circuit 18, and the multiplexing device 3 includes a data multiplexing circuit 12, a control signal demultiplexing circuit 18, and a multiframe synchronization circuit 18. Signal multiplexing circuit 13 and multi-frame pattern generation circuit 1
4 and a multiplexing circuit 15. In addition, in the same figure, multiplexing? The data transmitted in the direction of 1 and the carrier detection signal CD of the 100 series control signals are interfaces. The other control signals of the 100 series inputted from the 1G to the data multiplexing circuit 12 and the control signals of the 200 series inputted from the interface 11 are inputted to the control signal multiplexing circuit 13. The control signal multiplexing circuit 13 arranges the control signals in the two envelopes described above in a multi-frame set /u based on the output of the multi-frame pattern generation circuit 14, and sends them to the multiplexing circuit 15. The multiplexing circuit 15 multiplexes the data channel output from the data multiplexing circuit 12 and the control channel output from the control signal multiplexing circuit 13 into 84 Kb/s, respectively, and sends the multiplexed data channel to the digital private line 9.

The multiplexer 2 uses the demultiplexing circuit 16 to generate 3.4Kb/
s into each channel and distributed to the data separation circuit 17 and the control signal separation circuit 18, and the data separation circuit 17
The data signal and carrier detection signal CD are separated and output to the interface 7. Also, control signal separation circuit]8
According to the multiframe phase identified by the multiframe synchronization circuit 13 by the multiframe bit MF,
Each control signal is separated, and the 100 series control signal is output to the interface 7, and the 200 series signal is output to the interface 8.

In this embodiment, data and control signals cannot be transmitted using two 3.2 Kb/s channels. Therefore, it only occupies the I/IO of the 84 Kb/s digital transmission line, and the rest can be multiplexed and transmitted with other signals. That is, there is an effect that multiplexing efficiency can be improved.

Effects of the Invention As described above, in the present invention, 3.2 Kb/s l
Since the channel is configured to form multi-frames and the multi-frames are used to transmit control signals necessary for data transmission/reception and exchange connections, in addition to the data channel, there is one 3.2 Kb/s control channel. It is easy to send and receive the necessary control signals just by using the , which has the effect of improving the multiplexing efficiency of the digital transmission path.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a frame structure of the above embodiment, and 3rd rgJ is a diagram showing multiplexing on the transmitting side and receiving side of the above embodiment. FIG. 4 is a block diagram showing details of tH, FIG. 4 is a diagram showing a general envelope configuration, and FIG. 5 is a diagram showing an example of a bit arrangement of data and control signals in a conventional control signal transmission device. In the figure, l: terminal device, 2, 3: multiplexer, 4:
Line termination device, 5: Network control device, 6: Public switched network,
7, 8, 1G, 11: (7ta7a2.9: Digital dedicated line, 12: Data multiplexing circuit, !3: Control signal multiplexing circuit, !4: Multi-frame pattern generation circuit, 1
5: Multiplexing circuit, 1B=separating circuit, ! 7: Data separation circuit, 182 control signal separation circuit, 13: Multi-frame same* circuit.

Claims (1)

[Claims] In a digital leased line that performs time-division multiplex transmission of data using envelopes as units, multiframes are assembled for each envelope using a channel other than the data channel, and one of the control signals necessary for data transmission and reception is A control signal transmission device characterized in that the control signal is transmitted by a data channel, and other various control signals are transmitted by the multiframe.