JPH04144109A - Wiring device - Google Patents

Abstract

PURPOSE:To reduce crosstalk with a smaller number of parts and reduce the mounting density by providing dumping resistors and ferrite fuses respectively in series for a plurality of signal lines, and providing a plurality of buses, which collect the transmission signals in some divisions of a plurality of signal lines separately for each kind and have certain capacities. CONSTITUTION:In such constitution that the board where ICO (CPU) is wired and the board where IC1-ICn (memories) are wired are connected, the transmission signal between ICO and IC1-ICn is divided into information data, control data, and address data. In the signal line for each transmission signal, a dumping resistor R and a ferrite fuse L are interposed in series near each i/o terminal on the wiring board, whereby RL series circuits A10 and A11-A1n are constituted. Moreover, for one division of each signal line, those are collected on the back board BB separately for each kind of transmission signals thereby forming an information bus B1, a control bus B2, and an address bus B3, and the capacity that the bus itself is used in place of a capacitor, thus the number of parts of a filter circuit is reduced for reduction of crosstalk, and the mounting density is reduced.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention provides a method for reducing crosstalk between signals when transmitting multiple types of signals in communication equipment, etc. Related to wiring devices.

(Prior Art) As is well known, alarms are centrally managed in communication equipment and the like. In particular, due to recent increases in transmission speeds in communication devices, increases in calculation speeds in computers, complexity of device configurations, and compatibility with other systems, the types and amounts of alarm information are increasing. Under such circumstances, a large number of alarm information from many boards are transmitted in close proximity within the device. If the speed of each signal is low, there is little problem, but if the speed of the signal is high, crosstalk between each signal becomes a big problem.

Conventionally, a wiring device as shown in FIG. 2 has been used to reduce crosstalk. This device is compatible with ICO and n
IC", i to ICn, respectively (When connecting the return line R, connect a damping resistor R and a ferrite bead L in series with the signal line near each terminal, and ground it with a capacitor C. Filter circuits AO and A1~
An is interposed therebetween. That is, in this wiring device, high frequency noise is removed from the signal by the filter circuits AO and A1 to An, thereby reducing zero-stoke occurring between the signal lines.

However, in the conventional wiring device as described above, the damping resistance R is equal to the number of input/output terminals of the transmission signal,
Since a capacitor C and a ferrite bead L are required, when the number of signal lines is large, the number of parts increases and the mounting density increases.

(Problem to be Solved by the Invention) As described above, in conventional wiring devices, in order to reduce crosstalk, damping resistors, capacitors, and ferrite beads are required in the same number as the number of input/output terminals of the transmission signal. , the number of parts increases as the number of signal lines increases,
The packaging density will increase.

This invention was made to solve the above problems, and it is possible to reduce crosstalk with a smaller number of parts.
An object of the present invention is to provide a wiring device that can reduce packaging density.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the wiring device according to the present invention has the following features:
A wiring device that transmits a plurality of types of signals in parallel by arranging a plurality of signal lines in close proximity to each other, comprising: a damping resistor and a ferrite bead connected in series to each of the plurality of signal lines, and a plurality of the signal lines. A plurality of buses are formed to have a certain capacity by grouping one section of the bus for each type of transmission signal.

(Function) In the wiring device having the above configuration, by utilizing the fact that the bus itself has a capacitance, a filter circuit is configured to remove high frequency noise together with damping resistors and ferrite beads which are interposed in series in each of the plurality of signal lines. Eliminates the need for capacitors that were previously required for input and output terminals.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. However, in FIG. 1, the same parts as in FIG. 2 are designated by the same reference numerals, and the explanation will focus on the different parts here.

Figure 1 shows IC0 (here, CPU) in the communication device.
This shows the configuration of a wiring device that connects a board on which ICO is wired and a board on which ICI to ICn (herein referred to as memory) is wired.Transmission signals between ICO and ICI to ICn include information data, control data, and addresses. Divided into data. The signal lines for each transmission signal include ICO and ICI to IC.
A damping resistor R and a ferrite bead L are interposed in series near each input/output terminal on the n wiring board,
RL@column circuits AIO and A11 to A1n are configured.

Further, one section of each signal line is grouped into a lotus line for each type of transmission signal on the backboard substrate BB. That is, the backboard board BB has an information data bus B1,
A control bus B2 and an address bus B3 are formed.

In the above configuration, the crosstalk reduction effect will be explained below.

2. Description of the Related Art Generally, in communication equipment, a configuration in which a plurality of boards are inserted into a backboard to form one subrack is widely used. Here, as shown in Figure 1, multiple I
Connect the C board to buses 81 to B3 on the backboard board BB.

Here, the buses 81 to B3 have a finite capacity determined by the length and width of the bus, and the thickness and dielectric constant of the substrate. Therefore, due to the capacity of buses 81 to B3, a filter circuit is constructed by combining the RL series circuits AIO and AIl to Aln with buses 81 to B3, and the capacitors required in conventional filter circuits are omitted. However, the same effect as before can be achieved.

Therefore, by transmitting signals using the bus on the backboard, the wiring device with the above configuration can use the capacitance of this bus itself instead of a capacitor, and the filter circuit for reducing crosstalk can be used. It is possible to reduce the number of parts and reduce the packaging density.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a wiring device that can reduce crosstalk with a smaller number of parts and can reduce packaging density.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a wiring device according to the present invention, and FIG. 2 is a circuit diagram showing the configuration of a conventional wiring device having a crosstalk reduction function. A O=A n...filter circuit, R...damping resistor, L...-phyllite bead, C...capacitor, A1.0~Aln...RL series circuit, BB...
・・Backboard, B1・・Information data bus, B2・・・
・Control m bus, B3...address bus.

Claims (3)

[Claims] (1) In a wiring device that transmits multiple types of signals in parallel by arranging multiple signal lines in close proximity, a damping resistor and a ferrite bead are interposed in series with each of the multiple signal lines, and the multiple signal lines A wiring device comprising a plurality of buses formed so as to have a certain capacity by grouping one section of the bus for each type of transmission signal. (2) The wiring device according to claim 1, wherein the plurality of types of signals are information data, control data, and address data, and the plurality of buses are an information data bus, a control bus, and an address bus. (3) The wiring device according to claim 1, wherein the plurality of buses are formed on one substrate.