JPS6010942A - Data information transmitting system - Google Patents

Abstract

PURPOSE:To transmit data information through a digital relay line by eliminating the effect on the data information by a bit steal function and all zero inhibiting function. CONSTITUTION:A converting circuit CH1 of a digital terminal DT2 is transmitted to an inserting circuit I while replacing a bit b0 and a bit b7 of data information transmitted from a network NW. After the inserting circuit I applies bit steal to a bit e1 of an exchange signal, the signal is transmitted to a digital relay line L2. After an extracting circuit R applies bit steal to an exchange signal bit e2, the R transmits the signal to an integration circuit INT. The integration circuit INT decides by majority a bit b7 of each channel CH at each consecutive 3-frame, decides a logical value of a terminal signal bit S and transmits it to a converting circuit CH2. The converting circuit CH2 replaces bits b0 with b7 which are the data information of each channel CH conversely as the converting circuit CH1 and transmits the result to the network NW.

Description

[Detailed Description of the Invention] +a) Technical Field of the Invention The present invention relates to a digital terminal, and in particular to a data information transmission method (BL) that enables data information sent out by a data terminal etc. to be transmitted via a digital trunk line. In digital trunk lines that multiplex transmit audio signals,
Each channel is composed of 8 bits per predetermined period (for example, 8 kHz). When automatic exchanges are connected to each other by such digital trunk lines, in order to transmit the connection status to the opposite automatic exchange, the automatic exchange uses one of the 8 bits at a predetermined frame period (for example, 6 frame periods). A so-called bit steal is performed in which one bit at a predetermined position is used. Also, depending on the digital trunk line, each bit to be transmitted is consecutively a predetermined number (for example, 15 bits).
When the logic value becomes 0, the device may have a so-called all-0 prohibition function that forcibly sets the predetermined number of 1 bits to the logic value 1. This type of bit steal function and all-O prohibition function have almost no effect on the audio signal transmitted by each channel, but have a non-negligible effect when transmitting data by each channel.

(C1 Prior Art and Problems Fig. 1 is a diagram showing an example of a conventional data information transmission system, and Fig. 2 is a diagram showing an example of data information of the digital trunk line in Fig. 1. , the data terminal DTE is connected to the network NW of the digital exchange via the data service unit DSU and the digital subscriber circuit DLC, and also to the digital trunk line L.
1 and L2 are accommodated via digital terminals DTI and DT2, respectively. Data terminal DTE
The data information sent to and received by the network NW via the data service unit DSU and the digital subscriber circuit DLC is transmitted and received at a predetermined frame period (e.g. 8 kHz).
Each bit consists of 8 bits bo to b7, and bit b1
Bits b6 to b6 are used as data bits DO to D5 to transmit data to the opposite data terminal DTE, bit b7 is used as a terminal signal bit S to transmit the state of the data terminal DTP to the opposite data terminal DTE, and the remaining bits bO
is not particularly used. Such data terminal DTE4
<When connected to the channel CH of the digital trunk line L1 or L2 via the network NW, the data information transmitted by each channel CH of the digital trunk line L1 or L2 becomes as shown in FIG. In addition, the digital relay line transmits the exchange signal (pi) between the opposing digital exchanges.
In order to transmit and receive the data, bit b7 of each channel CH is stolen every six frame periods. Such bit stealing is the data bit D of each channel CH.

Although it does not affect D5 in any way, the data terminal DT
It affects the terminal signal bit S transmitted and received by E. Further, the digital relay line L2 has a function of inhibiting all O bits for 15 consecutive bits. Such 0 prohibition function may affect data pins 1-D5.

As is clear from the above explanation (in a conventional data information transmission system, digital trunk lines L1 '1 and L
Data terminal DT with the bit steal function of 2
There is a risk that an error may occur in the terminal signal (bit S) transmitted and received by the data terminal DTE, and an error may occur in the data (bit D5) transmitted and received by the data terminal DTE due to the all-zero prohibition function provided in the digital trunk line L2 (7). Therefore, it was impossible to transmit data information over digital trunk lines L1 and L2.

(dl Object of the Invention The object of the present invention is to eliminate the drawbacks of the conventional data information transmission method as described above, and to realize a means for eliminating the influence on data information by the bit steal function and all zero prohibition function. The purpose is to enable data information to be transmitted via digital trunk lines.

(e) Structure of the Invention The object of the present invention is to provide a digital terminal for connecting a digital trunk line and a digital exchange, which steal bits at a first predetermined position of data information transmitted by each channel at a predetermined frame period; converting means for exchanging signal bits at a second predetermined position of data information sent by the digital exchange with bits at the first predetermined position and transmitting the same to the channel; means for reproducing said signal bits by integrating bits at said first predetermined positions of data information; This is achieved by providing means for exchanging the media and sending it to the digital exchange machine.

(f) Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a diagram showing a data information transmission system according to an embodiment of the present invention, and FIGS. 4 and 5 are diagrams showing an example of data information of the digital trunk line in FIG. 3. Note that the same reference numerals indicate the same objects throughout the figures. In addition, in FIG. 3, only the network NW of the digital exchange and the digital terminals DTl and DT2 connecting the digital trunk lines L1 and L2, respectively, are shown, and the data terminal DTE, data service UNISO)
The DSU and digital subscriber circuit DLC have been omitted. In Fig. 3, the digital terminal DTI receives an exchange signal pinto e transmitted from the network NW.
An insertion circuit I that steals 1 into bit b7 of each channel CH, and a digital relay line L1 to each channel C.
An extraction circuit R is provided for extracting the exchange signal pinto e2 that arrives due to the pinto steal of the pinto b7 of H. Data information transmitted from a data terminal DTE (not shown) to a network NW via a data service unit DSU and a digital subscriber circuit DLC is transmitted from a first
Although it is substantially the same as in the figure, the terminal signal pin S is placed in the bin bO, and the pin b7 is not used for transmission between the data terminals DTP and is always set to a logic value of 1. The data information sent to the digital trunk line L1 is also substantially the same as that in FIG. 2, as shown in FIG. 4, except for bits bo and b7. Therefore digital terminal DTI
The bit stealing by the inserting circuit I and the extracting circuit R in FIG. Furthermore, in addition to the insertion circuit I and the extraction circuit R, the digital terminal DT2 is provided with conversion circuits CHI and CH2, and an integration circuit INT. Conversion circuit CH1
are the bits bo, ! of the data information as described above transmitted from the network NW. : Replace with b7 and transmit to the insertion circuit ■. The insertion circuit (2) steals the exchange signal bit e1 in the same manner as in the digital terminal DTI, and then sends it to the digital trunk line L2. As a result, the data information sent to the digital trunk line L2, as shown in FIG. 5, is the same as that in FIG. 2, except that bit bO is always set to the logical value l. As a result, since the logical value 1 (bin) bO is transmitted every 8 bits at least, the all 0 prohibition function is not activated and the data pins 1-Do to D
5 and terminal signal pin I-3 are not forcibly set to logical value 1, but terminal signal bit 1 S is affected by bit stealing every 6 frame periods as in Fig. 2. There is a fear.

On the other hand, the data information arriving from each channel CH of the digital trunk line L2 is also similar to that shown in FIG.
may be affected by bit stealing every 6 frame periods. - The extraction circuit R steals the exchange signal bit e2 in the same way as in the digital terminal DTI, and then transmits it to the integration circuit INT. The integrating circuit INT takes a majority vote on the bin b7 of each transmitted channel CH every three consecutive frames, determines the logical value of the terminal signal bit S, and transmits it to the converting circuit CH2. Conversion circuit C
H2 reversely exchanges bits bQ and b7 of data information of each channel CH, and converts the network NW.
Send to. As a result, the influence of the bit steal function on the terminal signal bit S is removed, and the terminal signal and bit S are placed in bit bQ and sent to the network NW.

As is clear from the above description, according to this embodiment, bit b of the data information is used for the digital relay line L1 having only the focus steal function.

By arranging the terminal signal bit S in Interchanging bits bO and b7 and integration circuit INT
By reproducing the terminal signal bin) S, the influence on data information is removed.

It should be noted that FIGS. 3 to 5 are only one embodiment of the present invention, and for example, the digital terminals DT1 and DT2
The configuration is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case. Further, the data information of each channel CH is not limited to what is shown in the figure, and many other modifications may be considered, but the effects of the present invention do not change in any case.

(g) Effects of the Invention According to the present invention, in the digital terminal, it is possible to eliminate the influence on data information by the bit steal function and the all O prohibition function, and the data information can be transmitted through the digital trunk line. becomes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional data information transmission method.
FIG. 2 is a diagram showing an example of data information on the digital trunk line in FIG. 1, FIG. 3 is a diagram showing a data information transmission system according to an embodiment of the present invention, and FIGS. 4 is a diagram showing an example of data information of a digital trunk line in which FIG. 4 shows a diagram of a digital trunk line that does not have an all-O prohibition function, and FIG. 5 shows a diagram of a digital trunk line that has an all-0 prohibition function. . In the figure, bO to b7 are bits, CH is a channel,
CHI and CH2 are conversion circuits, DO to D5 are data bits, DLC is a digital subscriber circuit, DSU is a data service unit, DTl and DT2 are digital terminals, DTE is a data terminal, e, el and e2
1 represents an exchange signal bit, 2 represents an insertion circuit, INT represents an integration circuit, Ll and L2 represent digital trunk lines, NW represents a network, R represents an extraction circuit, and S represents a terminal signal bit. v; 1 Zuhei 2 Kokuso 3 Zumine You Zuzo 6 diagram

Claims (1)

[Claims] In a digital terminal connecting a digital switch and a digital trunk line that steals bits at a first predetermined position of data information transmitted by each channel at a predetermined frame period, a second bit of data information transmitted by the digital switch is used. converting means for exchanging a signal bit at a predetermined position with a bit at the first predetermined position and transmitting it to the channel; and a bit at the first predetermined position of data information arriving from each channel of the digital trunk line. means for reproducing said signal bits by integrating said signal bits; and means for exchanging bits at said first and second predetermined positions of said data information including said signal focus reproduced by said means and transmitting said bits to said digital exchange. A data information transmission method comprising: