JPS63131736A - Total multi-frame system - Google Patents

Abstract

PURPOSE:To attain simultaneously data transmission/reception for terminal equipments having a different speed by sending a clock signal, a frame signal and a multi-frame signal from a digital exchange accommodating plural terminal equipments of different data transfer speed so as to apply simultaneous operation to the terminal equipments of different speed. CONSTITUTION:A data from composite terminal equipments TE40, TE42 is fed to TE 50, 51 via a digital subscriber line DLN11 and an interface device INF 21, and a data from the TE 41 is fed to a TE 60 respectively via the DLN 12 and the INF 22. The DLN 11 and DLN 12 are also of multi-frame constitution and the time position of the frame therein is assigned freely from a digital exchange EX1. Thus, the simultaneous data transmission and reception of different speed terminal equipments are applied. Moreover, the time position of the frame in the multi-frame assigned to the terminal equipment is managed unifiedly by an EX 1 so as not to be duplicated with other terminal equipments.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a total multi-frame system of a digital exchange that allows simultaneous operation of different speed terminals accommodated via a digital subscriber line.

[Conventional technology]

In conventional digital exchanges, data is transferred by connecting terminals with the same speed to the digital subscriber line, or by inserting an invalidation signal for low-speed terminals to make the effective speed the same. .

[Problem that the invention seeks to solve]

Therefore, terminals with different speeds cannot simultaneously transmit and receive data with opposing terminals in multiple directions. In other words, the data transfer rate of a digital subscriber line is, for example, 64
In the case of Kbps, two 16Kbps terminals and 32K
BPS terminals cannot be connected to the same digital subscriber line at the same time.

[Means for solving problems]

The total multi-frame system of the present invention transmits clock signals, frame signals, and multi-frame signals to digital subscriber lines from a digital exchange accommodating multiple terminals with different data transfer speeds via digital subscriber lines. This configuration allows terminals to perform simultaneous operations.

〔Example〕

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

Three combined terminals (TE) with different speeds connected 40°41
．． The simultaneous operation of 42 will be explained below. Here, the data transfer speed of the compound terminal is TE40. TE41゜TE50
, TE60 are each 18Kbp, TE42. T.E.
511d32Kbps, and TE40 is TE5
0, and it is assumed that TE41 faces TE60 and TE42 faces TE51, respectively. Furthermore, assuming the effective data rate of the digital subscriber line is 64 Kbps,
Exchange with LNIO! The TEs 40, 41, and 42 are connected via an interface device (INF) 20 having an electrical and physical interface conversion function between the machine side and the composite terminal side. The total speed of each terminal is 16◆16 + 3
2 = 64Kbps, and matching is performed at the same speed as DLNIO, so it is seemingly possible to send and receive data via DLNIO to three terminals in one frame, as shown in Figure 2. However, for example, if one frame is based on the audio length, it is 1 frame.
The frame is 8KHz, which is 125μ in terms of time.
It is necessary to balance the electrical transmission on the digital subscriber line every s, and if a plurality of terminals access one after another within one frame, the transmission cannot be balanced.

This means that the time allocation within the frame of FIG. 2 is not perfect. Next, the multi-frame structure, which is a feature of the present invention, will be explained with reference to FIG. A data transfer time of one frame is assigned to each of the three TEs 40, 41°42. In this embodiment, TE40 is frame Fa and TE41 is frame Fb.
, TE42 has a 4 multi-frame configuration in which a total of 4 frames, ie, frame Fc twice, are allocated, and 4 frames are written in one repetition unit. In this multi-frame configuration, the minimum unit of time allocated to each terminal is a frame, so there is no problem of unbalanced transmission as described above. TE40 has a data transfer rate of 16Kbps
Therefore, one frame Fa within one multiframe is occupied. This is a clock signal and a frame signal sent via EXl 9 lNF20 and a multi-frame lt! = 5 is done to identify the frame that the TE 40 in the multiframe should occupy. The three items 1 above are signals that are transmitted from EXI through individual signal lines or embedded in the data line (common signal line).
All you have to do is send it as EXl. Similarly, TE41 occupies frame Fb, and TE42 has twice the 32Kbps
occupies two frames Fc. Therefore, DLN
The frame structure within one multiframe in IOK is Fa
-Fc-Fb-Fc. This order is not particularly fixed; in this example, Fb is assigned first, and FCs corresponding to TE42 are assigned one each before and after Fb. Of course, F, - The order may be Fb-F, -F, etc. Data of TEs 40, 41, and 42 having a multi-frame configuration that arrives at EXI via DLNIO is exchanged in EXI frame by frame. That is,
Data for TE40 and TE42 are available in DLNII and l.
The data from TE41 to TE50 and 51 via NF21 is sent to TE60 via DLN12 and lNF22.
sent to each. DLNII and DLN12 also have a multi-frame configuration, in which the temporal positions of seven frames are freely assigned from EXI. In this example, due to data transfer speed, DLNII is 16+
32 = 48 Kbps uses 3 frames in 6 multi-frames, and DLN12 uses 16 Kbps, so only 1 frame in the multi-frame is used, and the remaining frames are allocated to other terminals. It is possible. In this way, simultaneous data transmission and reception between different speed terminals is possible.

Note that it is necessary to centrally manage the temporal positions of frames within a multiframe assigned to a terminal in EXI so that they do not overlap with those of other terminals.

[Effects of the Invention] As explained above, according to the present invention, it is possible to operate a composite terminal whose speed is lower than the data transfer rate of a digital subscriber line simultaneously with other composite terminals by transmitting and receiving data in a multi-frame configuration. can. In addition, digital subscriber line
It is possible to effectively utilize the b transmission path without creating any time vacancies.

Furthermore, the digital exchange itself only needs to have the hardware necessary for frame-by-frame exchange, and can be constructed economically.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an embodiment of the present invention, Figure 2 and M
FIG. 3 is a diagram showing the configuration of a time-division frame and a multi-frame. 1...Digital exchange (EX), 10, 11
゜12...Digital subscriber line (DLN), 2
0.

Claims (1)

[Claims] A digital exchange that accommodates multiple terminals with different data transfer speeds sends clock signals, frame signals, and multi-frame signals to the digital subscriber line via the digital subscriber line to cause terminals with different speeds to perform simultaneous operations. Features a total multi-frame system.