JPH04199925A - Serial information transfer method - Google Patents

Abstract

PURPOSE:To reduce the hardware amount for an information transfer line and to improve information transfer efficiency by time-divisionally multiplexing plural bits of low speed data by means of a bit synchronous clock and a frame synchronous clock for continuous serial information transfer and making the frame synchronism of message-like data and continuous serial information independent. CONSTITUTION:Call data 10 and control information 12 between a central control unit 1 and line corresponding parts 5a-5n, and between a time division channel device 2 and the line corresponding parts 5a-5n are stored in an information synchronizing circuit 3 through a central control unit interface 1'. The transfer destination of control information 12 is decided and control information is bit-synchronized and it is connected to the line corresponding parts 5a-5n through composite information transfer lines 4a-4n. Call data 10 and control information 12 share a clock 8 on the composite information transfer lines 4a-4n and they are bit-synchronized. Then, an information generation position is transferred to transfer control information 12 by making it independent of the frame synchronism of call data 10 by using a strobe signal 11. Thus the hardware of the transfer line is reduced and the transfer efficiency of message-like data is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial information transfer method for efficiently transferring serial information such as single-call highway data and control data in a digital exchange.

[Conventional technology]

In the conventional technology, "Research and Practical Application Report" Vol. 31, No.
As shown in 11, ρ, and 21, the continuous serial information transfer and the sequentially generated message-like information transfer were performed independently, as shown in the SP bus, which is a communication highway and a control bus. Another method is to completely synchronize different types of serial information, such as transferring different information using one time slot for continuous serial information transfer, as shown in Figure 2 of P. 21 of the above-mentioned document. There was a way to do the transfer.

According to these methods, no consideration is given to the necessary hardware in the former case, and if multiple types of low-speed data transmission and reception are required in addition to the telephone highway and SP bus, It was necessary to provide independent information transfer paths for each type of information transfer, including low-speed data.

In addition, in the latter case, no consideration is given to information transfer efficiency, and the transfer efficiency of mesh-shaped data that occurs sequentially depends on the transfer cycle of continuous serial information, so This method could only be applied when the transmission efficiency of message-like data was sufficiently low.

FIG. 2 shows an example of a schematic configuration of a digital exchange according to the prior art. The time division communication path device 2 includes line corresponding parts 5a to 5n.
Communication data is transmitted and received between them using communication highways 6a to 6n, respectively. This call highway 6a-6n
consists of time-division multiplexed call data of a plurality of channels, a clock signal for bit synchronization, and a frame synchronization signal representing the frame head position of the time-division multiplexed call data. The central controller 1 also controls the time division call path bag W2 and the line handling units 58 to 5n via the central controller interface unit 1'.
In order to control a to 5n, they are connected through control information transfer paths 78 to 7n, respectively. These control information transfer paths 7a to 7n contain data necessary for controlling the single-line corresponding parts 5a to 5n, as well as one individual control signal, a bit synchronized clock for transmitting and receiving the data, and a strobe indicating the data position. Data transmission/reception control signals such as signals, fault communication signals for notifying the central control unit 1 of faults detected by the line handling units 58 to 5n, system switching control signals for switching the operational system of the duplexed part, line handling units It is made up of a group of low-speed individual control signals such as initial setting signals for initializing 5a to 5n. As described above, in the prior art, various types of information transfer paths are required for the communication highways 6a to 6n and the control information transfer paths 7a to 7n, respectively, in order to send and receive call data and to transfer control information. A plurality of line handling units 5a to 5n are installed according to the number of subscribers accommodated in this exchange, and all of them are the basic parts of the exchange. [2
, and the central control unit 1, these various information transfer paths have a great influence not only on the amount of hardware but also on the workability of cable connections when constructing a station or adding or subtracting a station.

[Problem to be solved by the invention]

In the above conventional technology, no consideration is given to the amount of hardware required for the information transfer path or the information transfer efficiency, and continuous serial information, sequentially generated message-like data, and multiple low-speed data other than these are If you try to transfer the information independently, the amount of hardware required for the information transfer path will increase.

If the serial information and the message-like data are transferred in complete synchronization, there is a problem in that the information transfer efficiency of the message-like data that is generated sequentially decreases.

An object of the present invention is to reduce the amount of hardware in an information transfer path with regard to the transfer of continuous serial information multiplexed in two time divisions, message-like data generated sequentially, and a plurality of low-speed data other than these, and to The object of the present invention is to obtain a serial information transfer method that improves the information transfer efficiency of message-like data.

[Means to solve the problem]

In order to achieve the above-mentioned reduction in the amount of hardware, the bit synchronization clock for continuous serial information transfer that is time-division multiplexed and the bit synchronization clock for message-like data transfer that is generated sequentially are shared, and these is obtained by time-division multiplexing a plurality of other low-speed data using the bit synchronization clock and the frame synchronization clock for continuous serial information transfer. In addition, in order to improve the transfer rate of message-like data, the message-like data is transferred using a strobe signal indicating the data position.
This is independent of frame synchronization for continuous serial information transfer.

[Effect]

By sharing the bit-synchronized clock for serial information transfer and the bit-synchronized clock for message-like data transfer, the bit-synchronized clock transfer hardware that was previously required when attempting to transfer both independently is eliminated. can be reduced. In addition, by time-division multiplexing using a bit synchronization clock and a frame synchronization clock for serial information transfer, multiple low-speed data, which had conventionally been sent and received by preparing separate transfer paths, can be transmitted and received individually. It is possible to reduce the hardware required for low-speed data transfer paths, as well as the bit synchronization and frame synchronization clock transfer hardware required for time division multiplexing.

Further, by using a strobe signal indicating the data position, the message-like data transfer is made completely independent of the frame period for continuous serial information transfer. This reduces the waiting time between the generation of message data and the next frame cycle when it is actually transferred, which occurs when message data is transferred in synchronization with the frame cycle for serial information transfer, and the wait time within one frame. This eliminates the problem of only being able to send one message per frame, and allows multiple messages to be sent in one frame simultaneously with the generation of message-like data, thereby improving the transfer efficiency of message-like data.

〔Example〕

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

FIG. 1 is a block diagram of a digital exchange that implements the serial information transfer method according to the present invention, and FIG. 3 is a diagram showing an example of the structure of the composite information transfer paths 4a to 4n in the above embodiment. In the configuration of the digital exchange shown in FIG. 1, control information and It is necessary to send and receive call data. The call data and control information are stored in the information synchronization circuit 3 via the central controller interface device 1', and the transfer destination of the control information is determined, bit synchronization is established, and then the composite information transfer path is transferred. It is connected to line corresponding parts 5a to 5n via 4a to 4n.

FIG. 3 shows the configuration of the composite information transfer paths 4a to 4n. The call data IO is time-division multiplexed continuous serial information, and bit synchronization is achieved with a clock 8. Further, the frame synchronization signal 9 is a frame pulse for call data 10 and represents the beginning position of a frame for one call data 10. The control data 12 is.

This occurs when the central control unit 1 issues a command, and bit synchronization is achieved with the clock 8. The issuing of commands by the central controller 1 is independent of the frame period of one call data 10, and therefore the strobe signal 11 is used to represent the position of occurrence of the control data 12.

Further, the low-speed individual control signal group is time-division multiplexed onto the control signal highway 13 and transmitted and received between the central control device 1 and the line corresponding parts 5a to 5n.

At this time, the clock 8, which is the pin 1 synchronization clock of the call data 10 and the control data 12, is shared for bit synchronization of the time-division multiplexed individual control signal group.
Regarding the frame start position of the control signal highway 13, by sharing the frame synchronization signal 9 representing the frame start position of one call data 10, the control signal highway 13
Frame synchronization is performed so that the beginning of the frame is represented.

Regarding the multiplexing of low-speed individual control signal groups to the control signal highway 13, it depends on the number of individual control signal groups to be accommodated and the signal speed required for them.

Various methods are possible. As shown in FIG. 3, if eight types of individual control signals are accommodated, for example, the above-mentioned system switching signal is set to A, the initial setting signal is set to B, etc., following the beginning of the frame, A and B are input every 8 bits. This shows a case in which individual control signals are repeatedly accommodated, and multiplexed so that A and B are accommodated again from the beginning of the next frame. Third
In the figure, if clock 8 is 32.768M7, frame synchronization signal 9 is 8kHz, and the number of signals is 8, the bit rate of 5 call data 10 and control data 12 is 32Mb/s, and the signal rate of individual control signal group is 4Mb/s. becomes. In the conventional method, although these signal speeds are sufficiently lower than 4 Mb/s, separate transfer paths are required for each.

Furthermore, one composite information transfer path interface circuit is provided for a plurality of line correspondence units 5a to 5n, and has a demultiplexing function of call data 10 and a distribution of control data 12 and individual control signal groups to each line correspondence unit. If you add functions to the minutes,
Groups of individual control signals to a plurality of line corresponding units can be multiplexed onto one control signal highway, making it possible to further reduce transfer path hardware.

As explained above, call data 10 and control information 12
This means that by sharing the clock 8 on the composite information transfer paths 4a to 4n and achieving bit synchronization, the amount of hardware on the information transfer path is reduced, and the information generation position is determined by the strobe signal 11 for the control information 12. Call data 1 using
By making it possible to transfer the control information 12 independently of the zero frame period, the transfer efficiency of the control information 12 is improved. Furthermore, the individual control signal groups are also time-division multiplexed onto the control signal highway 13 using an appropriate multiplexing side according to the signal speed and number of signals required for these, and the highway data transfer according to the present invention By sharing the clock 8 and frame synchronization signal 9 used for the call data 10 and control data 12, it is possible to reduce the amount of information transfer path hardware.

〔Effect of the invention〕

As described above, the serial information transfer method according to the present invention includes means for transferring time-division multiplexed continuous serial information using a bit synchronization clock and a frame synchronization clock;
A digital switching system comprising means for separately transferring message-like data that is sequentially generated independently of the frame period of the continuous serial information, and further separately from these means for transmitting and receiving multiple types of low-speed data. In the serial information transfer method, the bit synchronization clock for the continuous serial information transfer and the bit synchronization clock for the message data transfer are shared, and a strobe signal indicating the data position of the message data is used. The message-like data is transferred independently of the frame period for serial information transfer, and the multiple types of low-speed data are synchronized with the bit synchronization clock and frame synchronization clock for serial data transfer. By dividing and multiplexing and transmitting and receiving,
In addition to sharing the bit-synchronized clock for continuous serial information and message-like data, the bit-synchronized clock and frame-synchronized clock for serial information transfer are now used instead of the multiple low-speed data that had been sent and received by preparing individual transfer paths. Time division multiplexing is effective in reducing transfer path hardware. At the same time, it is possible to improve the workability of connecting information transfer cables during maintenance work such as station construction and addition/removal.

In addition, since the frame cycles of continuous serial information and message-like data are completely independent, it is possible to transmit message-like data at the same time as it is generated, and furthermore, it is possible to transmit multiple messages within one frame. This also has the effect of improving the transmission efficiency of message-like data.

Furthermore, by sharing clocks and multiplexing data,
The reduction in the number of physical signal lines eliminates the bottleneck of having too many connector pins on electronic circuit boards, and together with the shift to LSI data transmission/reception circuits, devices become more compact.
It also has an effect on economicization.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a digital exchange that implements the serial information transfer method according to the present invention, FIG. 2 is a block diagram showing a conventional digital switch, and FIGS.
g) is a diagram showing an example of the configuration of the composite information transfer paths 4a to 4n in the above embodiment. 2...Time division channel device 3...Information synchronization circuit 4
8 to 4n...Composite information transfer path 5a to 5n...Line corresponding section 8.Clock 9.Frame synchronization signal 11 Strobe signal Fig. 2

Claims (1)

[Claims] 1. Means for transferring time-division multiplexed continuous serial information using a bit synchronization clock and a frame synchronization clock, and generating the continuous serial information sequentially independently of the frame period. In a serial information transfer method for a digital switching system, the serial information transfer method for a digital switching system has a means for separately transferring message-like data to be transmitted, and a means for transmitting and receiving multiple types of low-speed data, in addition to the above, bit synchronization for continuous serial information transfer. By sharing the clock and the bit synchronization clock for the message data transfer, and by using a strobe signal that indicates the data position of the message data, the data can be transmitted independently of the frame period for the continuous serial information transfer. , a serial information transfer method characterized in that the message-like data is transferred, the plurality of types of low-speed data are synchronized with the bit synchronization clock for serial data transfer and the frame synchronization clock, time division multiplexed, and transmitted/received. . 2. The above-mentioned digital switching system consists of a communication path system device group and a control system device group, and the time division multiplex communication information transmitted and received between the communication path system devices and the communication path system device and the control system device. The serial information transfer method according to claim 1, wherein the method is applied to various types of control information to be sent and received.