JPS594349A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To attain the transmission with high reliabiity and multi-information, and high speed for the same transmission system, by transmitting both transmitting signals with one set of main operating section and switching the receiving at the same terminal device. CONSTITUTION:A symmetrical transmission generating section 9 generating a transmission signal with a symmetrical transmission format and a changing point generatin section 10 generating a transmission signal with a changing point transmission format are operated by switching at a central processing section 6 from a data of a data register 8, and the transmission signal mixed with two kinds of transmission formats is outputted through an OR gate 11. A terminal device discriminates the signal input from a main operating section by a pulse width discriminating section, the transmission format is discriminated from the output of the data register and the output of a set of the number of pulses counter and processed at a data processing section. Thus, the transmission signal mixed with the two kinds of transmission format is received by switching.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a symmetrical transmission generating unit that generates a transmission format for transmitting data in the form of parallel data within one transmission unit starting from a mark signal, and a change that generates a transmission format for transmitting data in long and short widths. The central processing unit switches between the point transmission generation unit and the transmission signal in which the two transmission formats are mixed, and the main operation unit sends out a transmission signal in which the two transmission formats are mixed. The present invention relates to a time division multiplex transmission system in which the fNf characteristic is that switching reception is performed.

An object of the present invention is to enable highly reliable transmission, large amounts of information, and high-speed transmission in the same transmission system, and to reduce system cost.

Generally, a time division multiplex transmission system, as shown in Figure 1,
A plurality of terminal devices (3) are connected to the main operation section f1+ via the transmission lfM+21, and the main operation section (1) sends a time division multiplexed transmission signal, and this transmission signal is received by the terminal device (3). Controls the load (4) connected to the terminal (3). Conventionally, in such a time division transmission system, as shown in Fig. 2, there is a change point transmission method in which l or FiO data is transmitted with a pulse width within one transmission unit starting from a master signal, and There is a symmetrical transmission method in which pulse widths are transmitted in a symmetrical manner as shown in FIG. 3 for the purpose of making the connection on the terminal (3) side non-polar during transmission. The change point transmission method is generally widely used because it can transmit a large amount of information at high speed, but its reliability is low, and the symmetric transmission method uses the same data with height symmetry and receives both data. High reliability can be obtained by performing confirmation processing, but the data length needs to be doubled, and the
It has the disadvantage of being inferior in terms of transmission speed.

The unexploded F3A was created in consideration of these points, and takes advantage of both the high reliability of the symmetrical transmission method and the large amount of information and high speed of the change point transmission method, and allows both systems to be operated from one main operation unit 0). It is possible to send out transmission signals and to switch between receptions using the same terminal device (3), and will be explained in detail below with reference to embodiments.

Figure 4(a) shows the transmission format of the change point transmission method.
Figure 4 (b) is the transmission format of the Fi symmetrical transmission system. The transmission format of the change point transmission system is a mark signal, X pit attenuation, data A of C hit.
and b-pit data B, l: formation, and respective transmission times tm, tx, ta, tb.

The transmission format of the symmetrical transmission method consists of a mark signal, the address gJ of the X hit, and the data C of the C hit, and the respective transmission times are tm and 2tx.

In this case, the number of data is reduced from the transmission speed to make it almost the same as 1bJ during transmission using the change point transmission method. That is, tm +tx +ta + tb≠tm + 2tx
+tc. This is to maintain the conventional transmission speed. In addition, a difference is made in the number of @ pulses (including 0-width data pulses), and the switching at the time of reception is set to trough I. That is, the number of signal pulses ゛ is: Mark signal 10z 10a + b'< 7-kui, 3'
ij+2X+2c.

The main operation section (1) which sends out transmission signals in which the two transmission formats as described above are mixed is constructed as shown in FIG. In FIG. 5, (5) (l- is the asthmatic address allocation storage section, (6) is the central processing section, (7) Vi clock generation section, (8) Iri data register, and (9) is the symmetrical transmission generation section. , flol is a change point transmission generation section, (II) is an OR gate.It generates a transmission sequence for the data of the symmetric transmission generation section +91 Vi data register (8) in a symmetric transmission format, and is a change point transmission generation section. Generating part flO) /
It generates a transmission signal based on the RI change point transmission format, is switched and operated by the central processing unit (6), and outputs a transmission signal in which two types of transmission formats are mixed through the OR gate (1). On the other hand, the terminal device (3) is configured as shown in Fig. 6, and has a main operation section (
The signal input from 1) is determined by the pulse width determination section (12I) and inputted to the data register a barrel, and also inputted to the pulse number counter 04 to increase the number of pulses. The output of data register 03j is sent to multiple EX-OR gates (15
1 (+5)..., and in case of symmetric data
The output of the X-OR gate θ5) θ5) becomes 0 and N
Since the output of the AND gate 0 is IK, this output and the output of the pulse number counter 04) are combined in the transmission format.]
The transmission format of the input transmission signal is determined by inputting it to the leg θ, and is processed by the data processing unit 08). therefore,
It is possible to switch and receive transmission signals in which two types of transmission formats are mixed.

As shown above, the present invention generates a transmission format that sends data as symmetrical data within l transmission unit starting from a mark signal, and generates a transmission format that sends symmetrical transmission data in the length of rlJ. The central processing unit switches between the two types of transmission formats, and the main operation &++ sends a transmission request containing a mixture of the two transmission formats, and the terminal device switches and receives the two transmission formats by comparing the number of pulses and symmetrical data. Therefore, we do not know the data length in the case of text/j-name transmission, where both the Hatake reliability transmission of the symmetric transmission method and the multi-information, high-speed transmission of the change point transmission method can be transmitted in the same system. In the case of friend point transmission, by making them the same, the responsiveness of the entire system can be maintained, and the system cost can be reduced.

[Brief explanation of drawings]

Figure 1 is a basic circuit diagram of a general time division multiplex transmission system.
Figure 2 is a transmission waveform diagram of the same change point transmission method as above;
The figure is a transmission waveform diagram of the same symmetrical transmission method as above, and Figure 4 (a
), (b) Transmission formats of the change point transmission method and symmetric transmission method used for each phantom misfire j, FIG. 5 is a block circuit diagram of the main operation section of an embodiment of the present invention,! Pj6
The figure is a block circuit diagram of the same terminal device. +1+... Main operation unit, (3)... Terminal, (6).
... central processing section, (9) ... symmetrical transmission generation section, too
l... Change point transmission generation unit, 04)... Pulse number counter, 05)... EX-OR gate, 06)... N
AND gate, 07)... Transmission Format/υt Judgment Department Agent Patent Attorney Ishi 1) Chief Figure 1 jlI2FI! J Figure '3 Figure 84 m x -↑C Figure 5 Figure 6

Claims (1)

[Claims] The central processing unit switches between a symmetrical transmission generation unit that generates a transmission format that sends data in symmetrical data within l transmission units starting from a mark signal, and a change-point transmission generation unit that generates a transmission format that sends data in long and short widths. In this way, a transmission signal in which two types of transmission formats are mixed is sent out from the main operation unit, and the two types of transmission formats are switched and received at the terminal device by comparing the number of pulses and symmetrical data. time division multiplex transmission system.