JPS62123889A - High speed channel - Google Patents

Abstract

PURPOSE:To obtain a channel of low power consumption and low cost without requiring many waveform compensating circuits by providing a waveform distortion compensating means that compensates the waveform distortion generated in the channel between optional switch steps. CONSTITUTION:Waveform distortion compensating circuits 109, 110, 111, 112 are provided between a secondary switch 405 and a tertiary switch 408. For instance, when a path from an incoming line 413 to an outgoing line 419 is looked at, the waveform distortion compensating circuit 112 compensates the waveform distortion between the incoming line 413 and the outgoing line 100 of a grid switch 404. Waveform distortion compensating circuits 309-312 are optimal designed for bit rate of 100Mb/s, and 323-326 are for 800Mb/s. Thus, a waveform distortion compensating circuit corresponding to respective signal speed can be selected at the time of path selection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed communication path, and more particularly to a space-back type high-speed communication path for exchanging high-speed digital signals.

(Conventional technology) Currently, integrated digital service networks (ISDN) provide a variety of communication services centered on voice and data.
construction is underway. However, in recent years, with the advancement of the information society, the traditional voice has changed.

In addition to data, there is a growing demand for an extremely wide range of services, including ultra-high-speed data, facsimile, and high-definition still images to video and high-definition video.

When such a signal is digitally encoded, the speed is 1.5 Mb/s, compared to 64 Kb/s for conventional voice and data.
The bit rate is extremely wide and high, ranging from 100 Mb/s to about 800 Mb/s, and for this reason, space-division communication channels are mainly used in exchanges for exchanging the above-mentioned high-speed digital signals. However, in exchanges that exchange such high-speed digital signals, waveform distortion occurring not only in the transmission path but also in the communication path of the exchange poses a major problem.

As a method of configuring this high-speed communication path, for example, the method described in IEICE technical report 5B83-105 r Ideas for Configuring Wideband Communication Path J Tawara Kanjiike is known.

FIG. 4 shows an example of a high-speed communication path according to the prior art. Fourth
The high-speed communication path shown in the figure has a number of incoming lines n that is below 400.401.
, a primary switch 402 composed of l() lattice switches with a number of outgoing lines t, and a secondary switch 405 composed of t lattice switches with an incoming line number S including 403 and 404, 406; Number of incoming lines t including 407
, a tertiary switch 408 constituted by five lattice switches with m outgoing lines, and ms waveform distortion compensation circuits including 409, 410, 411, and 412 provided at the outgoing lines of the tertiary switch. There is.

In FIG. 4, the -order switch 402 and the secondary switch 4
05. The secondary switch 405 and the tertiary switch 408 are linked to each other, and 413,
nk incoming lines including 414, 415, 416 and 41'
In S incoming lines including 7,418,419,420 can be arbitrarily connected.

FIG. 4 shows an example in which the input FF 1413 and the output line 419 are connected by the grid switches 400, 404, 407. When the pit-ray 1- of one call signal becomes high speed, the input line 413 and the output line 419 are connected. Waveform distortion occurs in the signal due to the effects of the skin effect and dielectric loss occurring in the wiring between the input line 413 and the output line 421, and the frequency characteristics of the switching element included between the input line 413 and the output line 421, which is the cause of code errors in high-speed communication paths. becomes. Therefore, in the high-speed communication path shown in FIG. 4, all outgoing lines of the tertiary switch 408 are
A number of waveform distortion compensation circuits including 10,411,412 ms are provided to reproduce the call signal.

Figure 5 shows the waveform distortion compensation circuit 409°410 shown in Figure 4.
．． A first specific example of 411 and 412 will be shown.

According to FIG. 5, the waveform distortion compensation circuit 409 shown in FIG.
410, 411, and 412 are an equalizing amplifier 500 to which a digital signal with waveform distortion is added, and a timing circuit 50 whose input is connected to the output of the equalizing amplifier 500.
1 and a data input 502 to the output of the equalizing amplifier 500,
It includes an identification/reproduction circuit 504 connected to a clock input 503 to the output of the timing circuit 501, respectively.

In FIG. 5, the equalizing amplifier 500 converts the input signal into a waveform suitable for identification by relatively amplifying the high-frequency components that have been attenuated along the path from the input line 413 to the output line 421 shown in FIG. The data human power 50 of the identification reproduction circuit 504 is formatted into
2 and the input of the timing circuit 501. The timing circuit 501 extracts the clock frequency component from the signal obtained in this way, converts it into a thin pulse train, and sends it to the clock shifter 503 of the identification and reproduction circuit 504.

The identification/reproduction circuit 504 identifies whether the signal applied to the data input 502 is '1'' or 0°' in synchronization with the clock signal applied to the clock input 503.
Plays back the signal waveform.

As such a waveform distortion compensation circuit, for example, a regenerative repeater circuit described in "Techniques of rPCM Communication" by Takashi Kaneko, published by Sanpo Publishing Co., Ltd., page 63 can be applied.

Figure 6 shows the waveform distortion compensation circuit 409°410 shown in Figure 4.
．． A second specific example of 411 and 412 will be shown.

In FIG. 6, the same numbers as in FIG. 5 indicate the same components as in FIG.

In FIG. 6, equalizing amplifier 500, similar to the first specific example shown in FIG. It is relatively amplified and sent to the input of the regeneration circuit 604. Regeneration circuit 6
04 identifies whether the signal is 1° or 0° by comparing the signal thus obtained with a predetermined threshold and reproduces the signal waveform.

[Problem that the invention seeks to solve]

However, the high-speed communication path according to the prior art shown in FIG. 4 requires waveform distortion compensation circuits with a total amount of s%, which causes an increase in the power consumption cost of the communication path. Furthermore, in the waveform distortion compensation circuits shown in FIGS. 5 and 6, the equalizing amplifier 500° timing circuit 501, etc. are often designed optimally for a predetermined signal speed, and for this reason, 1. 5Mb,/s~800M
It has been impossible to interchange various media with a wide range of bit rates ranging up to 1000 b/s.
The objective is to provide a high-speed communication path with low power consumption and low cost.

It is a further object of the present invention to provide a high speed communication path capable of exchanging a variety of media having a wide range of bi-sotorates.

[Means for solving problems]

According to the invention of Mizui 1, in a communication path formed by connecting a plurality of grid switches in multiple stages, waveform distortion compensating means for compensating for waveform distortion occurring in the surface communication path is provided between arbitrary switch stages. A characteristic high-speed communication path can be obtained.

According to the invention of Mizui 2, in a communication path formed by connecting a plurality of grid switches in multiple stages, a waveform distortion compensating means for compensating for waveform distortion occurring in the communication path is provided between arbitrary switch stages according to the signal speed. A high-speed communication path is obtained, which is characterized in that a plurality of such devices are provided and means is provided for selecting a waveform distortion compensating device according to the signal at the time of route setting.

Furthermore, according to the invention of Mizui 3, in a communication path formed by connecting a plurality of grid switches in multiple stages, waveform distortion compensating means for compensating for waveform distortion occurring in the communication path between arbitrary switch stages is provided in accordance with the signal speed. A high-speed communication path is obtained, characterized in that a plurality of such devices are provided on different paths, and means is provided for selecting a path including waveform distortion compensation means according to the signal speed when setting the path.

[Operation J] The present invention provides waveform distortion compensation for the outgoing line of the communication path by providing a waveform distortion compensation circuit between the stages with a small number of links in a communication path constructed by linking a plurality of grid switches in multiple stages. Compared to conventional high-speed communication channels that are equipped with circuits, the number of waveform distortion compensation circuits is significantly reduced.

Furthermore, the present invention provides a plurality of waveform distortion compensation circuits according to the signal speed for each path, and selects the waveform distortion compensation circuit according to the signal speed when setting the path, thereby making it possible to use various media having a wide range of bit rates. It is intended to enable exchange.

Furthermore, the present invention has a wide range of bit rates by providing a plurality of waveform distortion compensation circuits according to the signal speed on different paths, and selecting a path including the waveform distortion compensation circuit according to the signal speed when setting the path. It aims to enable the exchange of various media.

〔Example〕

Next, embodiments of the invention will be described with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of Mizui's invention. In FIG. 1, the same numbers as in FIG. 4 indicate the same components as in FIG.

For example, in a subscriber line exchange, the -next switch 40
2. The secondary switches 408 are each used as a line concentration switch, and the number of incoming lines nk and the number of outgoing lines IN S are designed to be equal. In such a case, in order to reduce the number of switch elements, the number of links kt and st is designed to be as small as possible within the range that allows the blockage rate compared to the number of incoming lines nk and the number of outgoing lines mS. In the embodiment of Mizuo 1's invention shown in FIG.
05 and the tertiary switch 408, m5-
ts) waveform distortion compensation circuits.

Focusing on the path from the incoming line 413 to the outgoing line 419 shown in FIG. Waveform distortion occurring between the input line 101 and the output line 419 of the grid switch 407 can be compensated for, for example, by adding a pre-equalization function to the output section of the waveform distortion compensation circuit l12.

As described above, in the embodiment of the invention of Mizuhiro 1 shown in FIG. 1, it is possible to significantly reduce the number of waveform distortion compensation circuits.

FIG. 2 is a block diagram showing an embodiment of the invention of Mizui 2. According to FIG. 2, a specific example of the waveform distortion compensation circuit is a first circuit to which a digital signal with waveform distortion is applied to the input.
waveform distortion compensation circuit 200° second waveform distortion compensation circuit 201
and a third waveform distortion compensation circuit 202, and any one of the outputs of the three waveform distortion compensation circuits 200, 201, 202.
and a switch circuit 203 for selecting one.

In FIG. 2, waveform distortion compensation circuits 200, 201° 202
For example, 1.5 Mb/s, 100 Mb/s
.

They are each optimally designed for a bit rate of 800 Mb/s, and when setting a communication path, a switch circuit 203 connects the waveform distortion compensation circuit 200 in the case of high-speed facsimile signals and the waveform distortion compensation circuit 200 in the case of normal video signals. In the case of a high-definition video signal, the waveform distortion compensation circuit 202 is selectively output.

As described above, by using the waveform distortion compensation circuit shown in FIG. 2, it is possible to exchange various media having a wide range of pitch rates.

FIG. 3 is a block diagram showing an embodiment of the invention of Sui-Tei 3. According to Figure 3, the embodiment of Sui-Tei 3's invention is 300,30
A primary switch 302 constituted by a plurality of lattice switches including 303° 304;
, 307, and a tertiary switch composed of a plurality of lattice switches including lattice switches 307 and 30 provided on the output line of the secondary switch.
It is constituted by a plurality of waveform compensation circuits including 9.310, 311.312.

The secondary switch 305 shown in FIG.
The output of each grid switch is provided with a plurality of waveform distortion compensation circuits including 323, 324, 325° and 326.

In FIG. 3, the primary switch 302 and the secondary switch 30
5. The secondary switch 305 and the tertiary switch 308 are linked to each other, and 313, 314
, 315, 316, and 317, 318.
, 319, 320 can be arbitrarily connected to a plurality of outgoing lines.

Here, for example, the waveform distortion compensation circuits 309, 310, 311.
312 has a bit rate of 100 Mb/'s, and waveform distortion compensation circuits 323, 324, 325, and 326 have a bit rate of 8
Optimal designs are made for bit rates of 00 M b and -' s, respectively.

In the third embodiment of the present invention shown in FIG. 3, for example, when setting a route from an incoming line 313 to an outgoing line 319, if the call signal speed is 100 Mb/s, the broken line in the figure is set. The waveform distortion compensation circuit 312 is selected by setting the path of the input line 313 - grid switch 30 - grid switch 304 - waveform distortion compensation circuit 312 - grid switch 307 - output line 319 shown in .
In the case of b/s, the incoming line 313- shown as a solid line in the figure
The waveform distortion compensation circuit 326 is selected by setting the path of the grid switch 300 - the grid switch 322 - the waveform distortion compensation circuit 326 - the grid switch 307 - the output rL319.

In this way, in the embodiment of Mizui's invention shown in FIG. 3, by selecting a path including a waveform distortion compensation circuit according to the signal speed at the time of path selection, it is possible to use various media having a wide range of bit rates. can be exchanged.

〔Effect of the invention〕

As described above, according to the present invention, a high-speed communication path with low power consumption and low cost can be provided without requiring many waveform distortion compensation circuits.

Furthermore, the present invention provides a high speed communication path capable of exchanging a variety of media having a wide range of bit rates.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment of Mizui's invention.
The figure is a diagram showing an embodiment of the invention of Mizui 2, and a diagram showing a specific example of a waveform distortion compensation circuit, Figure 3 is a diagram showing an embodiment of the invention of Genhaku 3, and Figure 4 is a diagram based on the prior art. FIG. 5 is a block diagram showing an example of a high-speed communication path, FIG. 5 is a block diagram showing a first specific example of the waveform distortion compensation circuit in FIG. 4, and FIG. 6 is a block diagram showing a second example of the waveform distortion compensation circuit in FIG. It is a block diagram showing a specific example. 300.301, 303.304, 306, 307.3
21,322,400,401,403°404,4
06, 407... Lattice switch, 109°110.
111,112,309,310,311.312,3
23,324,325,326゜409.410,41
1.412... Waveform distortion compensation circuit. Fig. 5 t concave

Claims (1)

[Scope of Claims] 1. In a communication path configured by connecting a plurality of grid switches in multiple stages, a waveform distortion compensating means is provided between arbitrary switch stages to compensate for waveform distortion occurring in the communication path. A high-speed communication route. 2. In a communication path configured by connecting a plurality of grid switches in multiple stages, a plurality of waveform distortion compensating means for compensating for waveform distortion occurring in the communication path between arbitrary switch stages is provided according to the signal speed, and the path is A high-speed communication path characterized by comprising means for selecting a waveform distortion compensation means according to the signal speed at the time of setting. 3. In a communication path configured by connecting a plurality of grid switches in multiple stages, waveform distortion compensating means for compensating for waveform distortion occurring in the communication path between arbitrary switch stages is placed on different paths depending on the signal speed. A high-speed communication path, characterized in that it is provided with a plurality of means for selecting a path including a waveform distortion compensating means according to the signal speed when setting the path.