JPS6158348A - Frame synchronization system - Google Patents

Abstract

PURPOSE:To prevent generation of erroneous synchronous pull-in by transmitting a space signal of '1' or '0' instead of sending out data when a departure from the synchronization in the opposite station is detected by a data time- division multiplexer. CONSTITUTION:When a receiving register 18 receives a frame signal RF from a transmitting register 27 in the opposite station, it transmits head information RS and control pattern position information RC to corresponding synchronous signal detector 15 and control pattern receiver 16. If the synchronization is not established, a detector 15 provides an asynchronous signal X to a control pattern transmitter 14, and a control pattern reciever 16 outputs an asynchronous signal Y to a selector 13. Then, a frame which is obtained through replacement of data F1 and F2 of an ordinary frame with a mark signal MARK, is transmitted from a transmitting register 17 to a receiving register 28. A synchronous pattern generator 12 is generated from a synchronous pattern signal SYN. A mark signal MARK which is totally '1' or '0' is generated from a selector 13 under control of signal Y, and a control pattern CONT is generated from a control pattern transmitter 14 under control of signal X, these signals being fed to a transmitting register 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a frame synchronization method, particularly a forward-moving frame synchronization method.

The forward-acting frame synchronization method, which is commonly used among frame synchronization methods, uses one unit (frame) of data transmission.
In this method, a synchronization/arm turn (SYN) is added to the forefront of the frame, and frame synchronization is achieved by detecting this synchronization pattern. [Problems with the prior art] The frame synchronization method uses the synchronization patterns S1 to S in Fig. 3.
The frame up to the goose is one frame 1f, and a control pattern C0NT is inserted between them. Sl and C0
Data f1 is provided between NT and between C0NT and S1.
, f* are inserted.

In the conventional method, synchronization was achieved based only on the synchronization pattern (SYN) located at the forefront of one frame.

Therefore, if there are data SJ and S'2 corresponding to the synchronization pattern (SYN) in the data fs-fzO in Figure 3, 1 f' will be mistakenly judged as one frame. Frame 1 f' will be processed.

That is, the conventional method has the problem of erroneous synchronization.

[Means for solving problems]

The present invention provides a frame synchronization method in which synchronization pull-in is performed accurately and eliminates the above-mentioned problems. A data TDM device consists of a receiving register for receiving claims with a J frame, a transmitting register for transmitting the frame, and a multiplexing section to which a plurality of terminal ports are connected.
A υ1 detector and a control pattern receiver are provided, and a synchronization pattern generator, a selector, and a control no-turn transmitter are provided on the input side of the transmission register, and the frame received by the reception register is out of synchronization by the synchronization detector. When it is detected that the control putter/receiver (i) is causing the same ltq error signal to the selector, the selector sends a mark signal of all "1" or all "0". The sync pattern generator sends a sync pattern, and the ffi control pattern transmitter sends a control pattern to the sending register, and the sending register sends the same ttA pattern, the control pattern, and the above to the receiving register of the opposing game. A frame synchronization method characterized in that a frame consisting of a mark signal or a space signal is transmitted.According to the present invention, when a data TDM device detects that a game is out of synchronization, data is transmitted. Everything on behalf of
Since a mark signal of ``1'' or a space signal of all ``0'' is sent, the game can accurately pull in synchronization without causing erroneous pull-in of synchronization.

〔Example〕

Hereinafter, the present invention will be explained by way of embodiments with reference to the accompanying drawings.

Figure 1 shows data TDM (
1 is a configuration diagram of a time division multiplex (time division multiplex) device; FIG. The data TDM device is
This is a device that arranges signals on the time axis using pulse trains as carrier waves and transmits them to the opponent's game. In FIG. 1, only the TDM device of the own station is shown, but a TDM unit with exactly the same configuration is also arranged at the opposing station. Therefore, for example,
The transmitting register 17 transmits the transmitting frame SF to the receiving register 28 of the opposing station, and conversely, the receiving register 18 receives the receiving frame RF from the transmitting register 27 of the opposing station.

The system of the present invention detects whether or not the TDM devices are synchronized with respect to the frames received from each other, and if the TDM devices are not synchronized as described later, the simple configuration shown in Fig. 2) is used. Sends the frame to the game player (,?L) This enables reliable synchronization. In Figure 1, Dll
...Din has multiple terminal ports, and the same terminal ports D21...D2n (not shown) are arranged in the game, one to one.
It corresponds to

Therefore, both compatible terminals transmit and receive the same data frame. That is, a frame transmitted from the terminal 1fiD11 is always received by the terminal port D21 of the opposing station, and vice versa.

The multiplexing unit 11 multiplexes data transmitted and received by the terminal ports Dll...Dln.

The synchronization/four-turn generator 12 is a device that generates a synchronization/f-turn transmitter for the transmission frame SF. The selector 13 is a device that outputs transmission data SFI to the transmission register 17 if the frame RF received by the reception register 18 is synchronized, and outputs a mark signal MARK to the transmission register 17 if it is not synchronized.

The control pattern transmitter 14 outputs control/9-turn C0NT to the transmission register 17 based on the signal from the synchronization detector 15.

The synchronization detector 15 receives the synchronization four turns SYN from the frame synchronization method received by the reception register 18, and detects whether synchronization is established or, conversely, whether synchronization is lost. As shown in FIG. 1(B), the synchronization detector 15 is of a known type, and compares the leading pattern R8 of the multiple received frame RF with the fixed synchronization pattern SYN using a comparator 151 to determine whether synchronization is achieved. The signal X is sent to the control pattern transmitter 14.

The control four-turn receiver 16 receives the information RC of the position where the control pattern of the received frame RF is stored, and sends a signal Y indicating whether or not synchronization is established to the selector 13 depending on whether or not synchronization has been achieved. Send.

As a result, the selector 13 selects MARK, SF 1, 8F
Select 2.

As will be described later, MARK is information sent via the transmission register 17 when synchronization is lost ((13) in FIG. 2), and SF1 and SF2 are information sent via the transmission register 17 when synchronization is established ((5) in FIG. 2). be.

The transmitting register 17 transmits frame 5Ftl- to the receiving register 28 of the opposing game.

The reception register 18 receives the frame RF from the transmission register 27 of the opposing station.

The operation of the data TDM device having the above configuration will be explained below.

In the method of the present invention, a data frame to be transmitted and received has the configuration shown in FIG. One frame IF is between 5YNO. Between IF SYN and C0NT, C0
There is data F1 between NT and SYN of the next frame.
*F! is located.

When the reception register 18 receives the frame RF having the above configuration from the transmission register 27 of the opposing game, it sends the head information R8 and the control pattern position information RC to the corresponding synchronization detector 15 and the control pattern receiver 16.

If synchronization is not established, the synchronization detector 15 outputs an asynchronous signal X to the control pattern transmitter 14, and the control four-turn receiver 16 outputs an asynchronous signal Y to the selector 13.

Next, as shown in FIG. 2(B), the data Fl and F2 portions of the normal frame (second figure) are mark signals! 1
Transmit the frame replaced by 1ARK to the transmit register 17
sends it to the receiving register 28 of the opposing game.

The synchronous four-turn SYN is generated by the synchronous turn signal generator 12, and the mark signal MARK is also controlled by the asynchronous (it number Y) selector 13. T with turn co is asynchronous.
The control pattern transmitter 14 generates the control pattern according to the number Y and sends it to the transmission register 17. The mark signal MARK is a signal that is all "1", but a space signal, that is, a signal that is all rOJ, may be sent in its place.

The transmission register 17 receives the above information and transmits the information as shown in FIG.
b) [Indication, synchronization] Arm turn SYN and control/9 turn C
A simple frame consisting of 0NT and mark signal M is transmitted to the receiving register 28 of the opposing game. Therefore, in the game, only the first SYN can be detected as a synchronization pattern υ,
Erroneous synchronization pull-in as in the conventional case does not occur.

〔Effect of the invention〕

As described above, according to the present invention, when the data TDM device detects that the game is out of synchronization, instead of transmitting data, the data TDM device is marked with all "1"s (,?-1ffi- or all "O"). Since a space signal is sent out, the game can reliably pull in synchronization, and erroneous pull-in of synchronization will not occur.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of an apparatus for carrying out the method of the present invention;
The figure is a configuration diagram of a data frame used in the method of the present invention. FIG. 3 is an explanatory diagram of a conventional frame. DESCRIPTION OF SYMBOLS 11... Multiplexer, 12... Synchronous turn generator, 13... Selector, 14... Control arm turn transmitter, 15... Synchronous detector, 16... Control No. 4 turn receiver, 17...transmission register, 18...reception register.

Claims (1)

[Claims] a reception register that receives a frame in which data is placed between the synchronization pattern and the control pattern and within a certain time after the control pattern; a transmission register that transmits the frame;
Data T consisting of a multiplexing unit to which multiple terminal ports are connected
A synchronization detector and a control pattern receiver are provided on the output side of the reception register of the DM device, and a synchronization pattern generator, a selector, and a control pattern transmitter are provided on the input side of the transmission register, so that the reception register receives When it is detected that the frame is out of synchronization by the synchronization detector, the control pattern receiver sends an out-of-synchronization signal to the selector, and the selector sends a mark signal of all "1" or The sync pattern generator sends a sync pattern and the control pattern transmitter sends a control pattern to the transmission register, respectively, for a space signal of all "0s",
A frame synchronization method characterized in that the transmission register transmits a frame consisting of a synchronization pattern, a control pattern, and the mark signal or space signal to the reception register of the opposing game.