JPH1022966A - Inter-station transmitting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by avoiding effects to a normally operating station when a fault is generated at frame phase control and each synthesizing terminal station. SOLUTION: Plural synchronizing terminal stations 1-1 to 1-n on a transmission side do not transmit the same frame synchronizing patterns of a synchronizing digital signal by the same phases, but synchronizing terminal stations 1-1 to 1-n on the transmission side insert the frame synchronizing pattern to transmit it to a multiplexing part 2, which bit-multiplexes it in a decided order to transmit it to a separation part 3. The part 3 bit-separates the signal transmitted from the part 2 in an order decided by the part 2 and transmits it to the synchronizing terminal equipments. Synchronizing terminal stations 4-1 to 4-n on a reception side extract a frame synchronizing pattern from a signal transmitted from the part 3 to execute frame synchronization to synchronize it with the synchronizing terminal stations 1-1 to 1-n on the transmission side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-station transmission system, and more particularly to a multiplexing / demultiplexing system for a plurality of synchronous digital signals in transmission between a plurality of synchronous terminal stations.

[0002]

2. Description of the Related Art As a conventional method of multiplexing / demultiplexing a plurality of synchronous digital signals, for example, Japanese Patent Laid-Open No. Hei 5-308335 discloses a method in which the same frame synchronization pattern of a plurality of synchronous digital signals is all in phase and is determined in advance. A multiplexing / demultiplexing method has been proposed in which bit multiplexing is performed in the above-mentioned order and transmitted, and the receiving side detects the frame synchronization pattern to separate each synchronous digital signal according to the order.

[0003]

However, in the above-mentioned conventional multiplexing / demultiplexing system, when a failure occurs in a functional unit for synchronizing the frame phase and at least one or more synchronization terminals, all of them are lost. There is a problem that stations cannot communicate.

[0004] The reason is that the same frame synchronization pattern of synchronous digital signals transmitted from a plurality of synchronous terminals is all multiplexed in a predetermined order by a functional unit that synchronizes the frame phase, and transmitted and received. This is because, on the side, by detecting the bit-multiplexed frame synchronization pattern, each synchronization digital signal is separated in accordance with the order determined at the time of bit-multiplexing.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a station which operates normally when a failure occurs in frame phase control and each synchronous terminal. It is an object of the present invention to provide an inter-station transmission system which avoids affecting the transmission and thereby improves the reliability.

[0006]

In order to achieve the above object, an inter-station transmission system according to the present invention determines a frame synchronization independently for each of a plurality of synchronization terminals on the transmission side, and converts a frame phase synchronization pattern into bits. A multiplexing unit for transmitting the data from each of the synchronization terminals by bit multiplexing, and a separating unit on the receiving side performs bit multiplexing in the order determined by the multiplexing unit on the transmitting side. Separating, transmitting the separated signal to each of a plurality of synchronization terminals on the receiving side, wherein each of the synchronization terminals detects a frame phase synchronization pattern in the bit data and synchronizes the frames. I do.

According to the present invention, in transmission between a plurality of synchronous terminals, a signal in which a frame synchronization pattern is inserted is transmitted to each of the plurality of synchronous terminals by bit-multiplexing, and the bit-multiplexed signal is separated into bits and received. The frame synchronization pattern is detected by each of the plurality of synchronization terminals on the side, and the frame synchronization is performed. A frame phase synchronization unit for achieving the same phase is not required. Communication between all the stations is not interrupted by the above-mentioned failure of the synchronous terminal station. That is, according to the present invention, since a plurality of synchronous terminal stations can operate in synchronization with each other, when a failure occurs in a certain synchronous terminal station, communication between normally operating synchronous terminal stations is prevented from being interrupted. can do. Further, the frequency used for communication between each of the synchronous terminals can be changed between the other synchronous terminals.

[0008]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a preferred embodiment of the present invention. Referring to FIG. 1, the embodiment of the present invention includes a functional unit that inserts a frame synchronization pattern into a plurality of synchronization terminal stations 1-1 to 1-n on the transmission side and transmits the frame synchronization pattern to a multiplexing unit 2; The unit 2 performs bit multiplexing with the frame pulse from the frame pulse inserting unit 5 and the clock in a predetermined order.

On the other hand, the separation section 3 on the receiving side separates the bit multiplexed signal into bits in the order determined by the multiplexing section 2 based on the frame pulse extracted by the frame pulse detection section 6 and the clock. Transmit to the stations 4-1 to 4-n. Further, the synchronization terminals 4-1 to 4-n extract a frame synchronization pattern from the signal and synchronize the frames between the synchronization terminals.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to explain the above-mentioned embodiment of the present invention in more detail, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a diagram showing the overall configuration of one embodiment of the present invention.

Referring to FIG. 2, in this embodiment, in the transmitting section, as a plurality of 2.048 MHz synchronization terminals, a frame phase synchronization pattern is set in each of two synchronization terminals 1-1 and 1-2. It is inserted and transmitted to the multiplexing unit 2. The multiplexing unit 2 synchronizes with the frame pulse and the clock transmitted from the frame pulse insertion unit 5 to synchronize with the synchronous terminal 1-1.
And a bit multiplexed signal of 4.096 MHz is transmitted to the separation unit 3 of the reception unit.

In the receiving section, a frame pulse detecting section 6
Then, the frame pulse and the clock inserted by the frame pulse insertion unit 5 are detected and transmitted to the separation unit 3. The demultiplexing unit 3 sequentially demultiplexes the 4.096 MHz bit multiplexed signal synchronized with the frame pulse and clock detected by the frame pulse detection unit 6 from the synchronous terminal 4-1 to the synchronous terminal 4-1 and 4-2. To transmit a 2.048 MHz signal.

The synchronous terminal stations 4-1 and 4-2 are connected to the synchronous terminal station 1--1.
The frame phase synchronization patterns inserted in steps 1 and 1-2 are detected, the frames are synchronized with the synchronization terminals 1-1 and 1-2, and synchronization between a plurality of synchronization terminals is established.

FIG. 3 is a timing chart for explaining the operation of this embodiment shown in FIG. Note that, in FIG. 3, the signal 〜 corresponds to the signal 示 し shown in FIG.

Referring to FIG. 3, frame pulse inserting section 5
Supplies a frame pulse signal and a 4.096 MHz clock signal to the multiplexing unit 2, and the multiplexing unit 2 outputs the 2.048 MHz output of each of the synchronous terminal stations 1-1 and 1-2 to the synchronous terminal station 1-1. Bit multiplex from the side, 4.096
Transmit MHz output.

In the above embodiment, two synchronous terminal stations are prepared and the example of two multiplexing is described. However, the number of multiplexing is n (n ≧ n).
Although it can be applied to 2), with respect to the frequency, the transmitting unit is set to a plurality of 2.048 MHz synchronous terminals.
The present invention can be applied to frequencies other than 2.048 MHz.

[0018]

As described above, according to the multiplexing / demultiplexing system according to the present invention, unlike the conventional system, a plurality of terminal stations need not transmit synchronous digital signals in phase from a plurality of terminal stations. Since the frame synchronization can be performed between the two, if a failure occurs in the frame phase control function for achieving the same phase, or if a failure occurs in a synchronization terminal station, it may affect the normally operating station. The inability to perform communication between all stations is avoided, and the effect of improving the reliability of inter-station transmission is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a configuration of an embodiment of the present invention.

FIG. 3 is a timing chart for explaining the operation of one embodiment of the present invention.

[Explanation of symbols]

 1-1 to 1-n Synchronous terminal 2 Multiplexer 3 Demultiplexer 4-1 to 4-n Synchronous terminal 5 Frame pulse inserter 6 Frame pulse detector

Claims (2)

[Claims] In a transmission system between a plurality of synchronous terminals, means for independently determining frame synchronization for each of a plurality of synchronous terminals on a transmitting side and inserting a frame phase synchronization pattern into bit data is provided. A bit multiplexing unit for transmitting data from each of the synchronous terminal stations, and a receiving side separating unit separates bits in an order determined by the multiplexing unit on the transmitting side; Wherein each of the synchronous terminals detects a frame phase synchronization pattern in the bit data and establishes frame synchronization. 2. The multiplexing unit bit-multiplexes bit data from a transmitting-side synchronous terminal in synchronization with a frame pulse and a clock from a frame pulse inserting unit. Extracting a frame pulse and a clock from the signal, the separating unit separates a multiplexed signal into bit data with the frame pulse and the clock extracted by the frame pulse detecting unit, and transmits the multiplexed signal to each of the receiving-side synchronous terminal stations; 2. The inter-station transmission system according to claim 1, wherein the receiving-side synchronization terminal extracts and detects a frame phase synchronization pattern in the separated bit data.