JPH06112991A - Cable misconnection compensation circuit - Google Patents

Abstract

PURPOSE:To prevent each section from being malfunctioned even when cables of different pairs are simultaneously connected contrary to a premises that plural sets of cables are alternatively connected to a common processing section through connector connection. CONSTITUTION:Drivers 26D1-26D3 and receivers 26R1-26R3, 27R are provided respectively in corresponding to each set of device connectors 11a, 12a. A first-in priority circuit 25 discriminates the arrival of the connection of cables 13 (11b), 14 (12b) based on a detection signal from cable connection detection circuits 23, 24. The first-in priority circuit 25 makes only a driver and a receiver relating to the first-in cable conductive. That is, even when a cable connector (cable) is connected to a device connector with a different set respectively, the occurrence of a fault of a transmission line installed between the common processing section 10 and the processing sections 2, 3 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable misconnection compensation circuit which prevents malfunctions when a plurality of sets of cables, which are premised to be exclusively connected, are simultaneously connected. It is intended to prevent a line failure due to a multiple connection of a cable which is mistakenly made when the number of lines to be installed or removed from a device or the like is increased.

[0002]

2. Description of the Related Art Conventionally, in a transmission device, a switching device, etc., in order to flexibly configure the device, a plurality of sets of connectors are provided corresponding to one line switching unit, and any one of the plurality of sets of line units is provided. A pair of cables can be accommodated alternatively.

FIG. 2 shows an example of a conventional cable connection configuration with a line unit in such a line switching unit.

In FIG. 2, the circuit switching unit 1 incorporates a time division circuit 10 composed of a time division multiplexing / demultiplexing circuit, a time switch, etc. to perform line exchange by time division. Further, the circuit switching unit 1 accommodates an external high-speed line and terminates or multiplexes the high-speed line unit 2, or accommodates an external low-speed line and terminates or multiplexes the low-speed line unit 3.
Can be accommodated alternatively by exclusive connection of the connector, and FIG. 2 shows a state in which the high-speed line unit 2 is accommodated.

In order to simplify the hardware configuration of the time division circuit 10 described above, the line speed of each input / output of the time division circuit 10 is, for example, no matter which line section 2 or 3 is accommodated. Same as 8 Mb / s. Here, when the capacity of the low-speed line unit 3 is small, the above-mentioned line speed is realized by multiplexing the physical line between the line switching unit 1 and the low-speed line unit 3. The realization of various line speeds can minimize the hardware configuration. FIG. 2 shows, for example, an external low speed line (not shown) housed in the low speed line unit 3 and a high speed line unit 2.
This is the case where the speed ratio to the external high-speed line (not shown) accommodated by the device is 1: 3 (this ratio will be described below although it is different from the actual ratio), and therefore the high-speed connector 11a of the line switching unit 10 is included. Is designed to be able to connect the connector 11b of the cable 13 having three built-in 8Mb / s physical lines, and the low speed connector 12a of the line switching unit 10 has only one built-in 8Mb / s physical line. The connector 12b of the cable 14 can be connected.

As described above, the line switching unit 1 is premised on accommodating the high-speed line unit 2 or the low-speed line unit 3 selectively. Therefore, the wiring between the connector unit and the time division circuit 10 and Receivers 13a to 13c and drivers 14a to
The input / output unit 14c is commonly used regardless of which is accommodated.

Although FIG. 2 shows a structure capable of accommodating one low-speed line unit 3, when the high-speed connector 11 is used when the input / output capability of the line switching unit 1 is constant, Since three physical lines can be connected by one cable 13, it has been conventionally performed to provide three low-speed connectors 12 and accommodate three low-speed line parts 3 at the same time to improve efficiency.

[0008]

However, it can be said that it is premised that the circuit switching section 1 selectively accommodates the high speed circuit section 2 or the low speed circuit section 3 by the exclusive connection of the connector 11 or 12. When the number of lines for transmission / switching equipment is increased or decreased, the cable 13 connected to the high-speed line unit 2 is connected to the line exchange unit 1 and the low-speed line unit 3 is connected.
The connection of the cable 14 connected to the line switching unit 1 to the circuit switching unit 1 may be mistakenly performed at the same time. For example, when one line unit is connected to the line switching unit 1 in operation, another line unit may be connected later and two types of line units 2 and 3 may be connected at the same time. In such a case, the operating line is damaged.

Such a problem is not limited to the transmission / exchange device, but a plurality of sets of cables (each set in FIG. 2 is a cable) are alternatively connected to the common processing section by connector connection. It is widely occurring in devices that are supposed to do so.

The present invention has been made in consideration of the above points, and violates this premise when it is premised that a plurality of sets of cables are alternatively connected to the common processing section by connector connection. The present invention is intended to provide a cable erroneous connection compensation circuit that can prevent malfunction of each unit even when cables of different sets are simultaneously connected.

[0011]

In order to solve such a problem, in the first aspect of the present invention, two or more sets of device connectors correspond to the inputs and outputs of the common processing section, and one or more sets of one or more device connectors. In the cable connecting device, in which the cable connector is connected to the device connector and the transmission path between the common processing unit and the external processing unit via the cable is electrically connected, the following components are provided.

That is, the connection of the cable connector is detected in correspondence with the transmission driver and the reception receiver whose conduction and non-conduction are controlled corresponding to each of the device connectors of each set and the connection of each of the device connectors of each set. The cable connection detection circuit and the transmission driver and reception receiver connected to the device connector corresponding to the cable connection detection circuit that determines the first-arrival / last-arrival detection signal from each cable connection detection circuit and outputs the first-arrival detection signal And a first-come-first-served circuit for conducting the above.

Further, in the second aspect of the present invention, in the same cable connecting device as described above, the external processing section is provided with the fixed pattern generator for generating the fixed pattern to be inserted into the signal train conducted in the cable. Also, on the common processing unit side, there is conduction, corresponding to each of the device connectors of each set,
A transmission driver and a reception receiver whose non-conduction is controlled;
Corresponding to each set of device connectors, the cable connection detection circuit that detects the connection of the cable connector based on the fixed pattern, and the first and last arrival of the detection signal from each cable connection detection circuit is determined to detect the first arrival. A first-come-first-served circuit for conducting only the transmission driver and the reception receiver connected to the device connector corresponding to the cable connection detection circuit outputting the signal is provided.

Here, the method of detecting the cable connection by the cable connection detection circuit is as follows: a fixed pattern inserted in the signal train through which the external processing section conducts in the cable and a fixed pattern preset by the cable connection detection circuit. It is preferable to collate the above.

Further, it is preferable that the fixed pattern output from the above-mentioned fixed pattern generator is a mixture of "0" and "1".

Further, the method for detecting the cable connection by the cable connection detection circuit is based on the change point of such fixed pattern from "0" to "1" or "1" to "0". Preferably there is.

It is a preferable aspect that the common processing unit is a line switching unit and the external processing unit is a line unit that performs line termination processing and multiple processing.

[0018]

In the first and second aspects of the present invention, two or more sets of device connectors correspond to the input / output of the common processing section.
It is intended for a cable connecting device which is premised on that a cable connector is connected to one or more device connectors of a set so that a transmission path between a common processing unit and an external processing unit via a cable is electrically connected. Therefore, it is against the assumption that the cable connectors are connected to the plurality of device connectors of different sets, and the external processing units of different sets are simultaneously connected to the common processing unit, which causes a failure.

Therefore, in the first aspect of the present invention, a transmission driver and a reception receiver whose conduction and non-conduction are controlled are provided corresponding to each set of device connectors. Then, the first-arrival priority circuit determines first-arrival or later-arrival of the detection signal from the cable connection detection circuit that detects the connection of the cable connector, and the first-arrival priority circuit is the transmission driver corresponding to the cable connection detection circuit that has output the first-arrival detection signal. Also, only the receiving receiver is made conductive, and even if the cable connectors are respectively connected to a plurality of device connectors of different sets, the transmission paths provided between the common processing unit and the external processing unit are in the same set to prevent occurrence of failure.

The second aspect of the present invention is substantially the same as the first aspect of the present invention, but is based on the premise that a fixed pattern generator is provided as an external processing unit, and the cable connection detection circuit on the common processing unit side is based on the fixed pattern. The present invention differs from the first invention in that the connection of the cable is detected.

The detection of the cable connection using the fixed pattern may be performed by collating the reception fixed pattern with a preset fixed pattern, and if the fixed pattern is a mixture of "0" and "1". For example, the change point of the logic level may be detected.

In practice, many devices have the above-mentioned premise for cable connection, and therefore, there are many transmission / switching devices, and it is preferable to apply the present invention to such devices. That is, it is a preferable aspect that the above-mentioned common processing unit is a line switching unit and the external processing unit is a line unit that performs line termination processing, multiplexing processing, and the like.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cable misconnection compensation circuit according to the present invention will be described below in detail with reference to the drawings. This embodiment is an example applied to a circuit switching unit in a transmission / switching device, etc., and its configuration is shown in FIG. 1 in which the same parts as in FIG.

Overall Configuration of the Embodiment In FIG. 1, in this embodiment as well, the line switching unit 1A selectively accommodates the high speed line unit 2 or the low speed line unit 3 by exclusive connection to the connector 11 or 12. The circuit is switched by the time division circuit 10.

However, in the case of this embodiment, the high speed connector 11a and the low speed connector 12a and the time division circuit 10 are provided.
The connection configuration between and is different from the conventional one, and this portion constitutes a cable misconnection compensation circuit.

High speed connector 11a and time division circuit 10
Receivers 26R1 to 26R3 and drivers 26D1 to 26D3 are inserted on the wiring between them, and a receiver 27R and a driver 27D are inserted on the wiring between the low speed connector 12a and the time division circuit 10. . That is,
This embodiment is different from the conventional one in that the receiver and driver for the high speed connector 11a and the receiver and driver for the low speed connector 12a are completely separated.

From the high speed connector 11a to the receiver group 26
A cable connection detection circuit 23 (231 to 233) is connected to each wiring extending from R1 to R3, and the cable connection detection circuit 23 connects the cable from the high speed line section 2 to the high speed connector 11a as follows. Detect connection. Similarly, the low-speed connector 12a to the receiver 27
A cable connection detection circuit 24 is connected to the wiring leading to, and the cable connection detection circuit 24 detects the cable connection from the low speed line unit 3 to the low speed connector 12a as follows.

Generally, in a transmission / switching device or the like, a fixed pattern is transmitted bidirectionally between the line unit and the line switching unit in order to confirm whether or not a signal can be normally exchanged between the line unit and the line switching unit. The fixed pattern is collated on the receiving side.

In this embodiment, by utilizing such a fixed pattern, the cable connection detection circuits 23 and 24 allow the connector 1 of the cable 13 or 14 from the line section 2 or 3 to operate.
It is detected whether 1b or 12b is connected to the connector 11a or 12a of the circuit switching unit 1A. Here, the fixed pattern does not take the pattern of all 1s or all 0s due to its character. In other words, the fixed pattern is all 1's when detecting the disconnection of the cable, detecting the device failure of the line section and the line switching section, detecting the clock abnormality, and the like.
Since an abnormality may not be detected when all or 0, the fixed pattern is selected as a pattern in which 0 and 1 are mixed. Therefore, the cable connection detection circuits 23 and 24 are realized by a configuration that detects a change point from 0 to 1 or a change point from 1 to 0 of the fixed pattern, or by a configuration that detects the fixed pattern itself. To be done.

Since well-known configurations can be applied to the configuration of the logic level change point detection circuit and the pattern matching circuit, which are the cable connection detection circuits 23 and 24, a detailed description thereof will be omitted.

These cable connection detection circuits 23 and 24
The detection signal from is given to the first-arrival priority circuit 25. The first-come-first-served priority circuit 25 has a detailed configuration as described later, and validates (makes available) either the line with the high-speed line unit 2 or the line with the low-speed line unit 3 mainly based on both detection signals. Is determined, and the receivers 26R1 to 26R3 and 27R and the driver 26D1 are determined according to the determined content.
Controls conduction / non-conduction of ~ 26D3 and 27D. In addition,
For the cable connection detection circuit 23, the first-come-first-served priority circuit 25 has the cable connection detection circuits 231 to 231 for the respective wirings.
If any one or more of 33 detects connection, it is recognized that the connector 11b of the cable 13 is connected to the high speed connector 11a.

The control of the first-arrival priority circuit 25 is basically performed as follows.

In the state where the cable connection detection circuit 23 outputs a significant detection signal and the cable connection detection circuit 24 outputs an insignificant detection signal, that is, the high-speed line section 2
In the state where only the cable 13 is connected, the first-come-first-served circuit 25 makes the receivers 26R1 to 26R3 and the drivers 26D1 to 26D3 conductive, and makes the receiver 27R and the driver 27D nonconductive.

Further, when the cable connection detection circuit 24 outputs a significant detection signal and the cable connection detection circuit 23 outputs an insignificant detection signal, that is, only the cable 14 of the low-speed line section 3 is connected. In the state of being
The first-arrival priority circuit 25 includes a receiver 27R and a driver 27.
D is made conductive, and receivers 26R1 to 26R3 and drivers 26D1 to 26D3 are made nonconductive.

Further, the cable connection detection circuits 23 and 2
4 outputs a significant detection signal, that is, the cable 1 from the high-speed line unit 2 and the low-speed line unit 3
In the state where 3 and 14 are connected together, the first-come-first-served circuit 25 includes the receiver 26R1 to 26R3 or 27R related to the connector 11 or 12 that is connected to the circuit switching unit 1A first, and the driver 26D1 to 26D3 or 27D.
To make the receiver 27R or 26R1 to 26R3 and the driver 27D or 26D1 to 26D3 related to the connector 12 or 11 connected later to be non-conductive.

When such control satisfies the premise that the cable 13 or 14 from the line section 2 or 3 is exclusively connected by the alternative connection of the connector 11 or 12, this premise is violated. Even if the cables 13 and 14 from both the line units 2 and 3 are simultaneously connected, only the line with the one line unit that is connected first is valid, and the line is switched without any trouble. Is possible.

The first-arrival priority circuit 25 is connected to each connector 1
A function for informing the connection state of 1 and 12 is provided to let a maintenance person or the like know an abnormality such as simultaneous connection.

Details of the first-come-first-served circuit 25 As described above, the greatest feature of this embodiment is that the line section 2 or 3 is formed by the alternative connection of the connector 11 or 12.
Even if the cables 13 and 14 from both line sections 2 and 3 are connected at the same time in violation of the assumption that the cables 13 or 14 from the In order to be able to execute it, the point is to control so that only the line with the one previously connected line unit is valid. Since the first-come-first-served circuit 25 that executes such a characteristic does not exist conventionally, its details will be described below.

FIG. 3 is a state transition diagram of the control state by the first-arrival priority circuit 25. In this embodiment, the first-arrival priority circuit 2
As the state of 5, three types of states S1 to S3 are defined.

The state S1 is a state in which the line with the high-speed line unit 2 is effectively used (operated). That is, this is a state to be taken when only the cable 13 with the high-speed line unit 2 is connected when the line switching unit 1A and the line units 2 and 3 are normal, and then the cable 14 with the low-speed line unit 3 is connected. It is in a state where it is maintained even if connected. Therefore, this state S1
Is a state in which the receivers 26R1 to 26R3 and the drivers 26D1 to 26D3 related to the high-speed line unit 2 are conducted.

The state S2 is a state in which the line with the low-speed line unit 2 is effectively used (operated). That is, this is a state that is taken when only the cable 14 with the low speed line unit 3 is connected when the line switching unit 1A and the line units 2 and 3 are normal, and then the cable 13 with the high speed line unit 2 is connected. It is in a state where it is maintained even if connected. Therefore, this state S2
Is the receiver 27R and the driver 2 related to the low-speed line unit 3.
7D is in a conductive state.

The state S3 is used when the line units 2 and 3 are started up,
The state is set when the line switching unit 1A is not connected to the line units 2 and 3, or when the line switching unit 1A is not activated and the fixed pattern cannot be detected. That is, it is a state in which the line with the line units 2 and 3 cannot be effectively used.
By preparing this state S3, there is an advantage of eliminating the indefinite state when the line units 2 and 3 are started up or when the line switching unit 1A is not connected. In the case of this embodiment, in this state S3, the receiver 26R1 related to the high-speed line unit 2
26R3 and drivers 26D1 to 26D3 are made conductive.

The transition between these states S1 to S3 is
It is determined by the states of inputs A to E below.

Input A: Cable 13 from high-speed line section 2
"1" when is connected, and "0" when not connected. This input A corresponds to a logical product of detection signals of the cable connection detection circuits 231 to 233.

Input B: Cable 14 from low speed line section 3
"1" when is connected, and "0" when not connected. The input B corresponds to the detection signal of the cable connection detection circuit 24.

Input C: represents the line selection state before the transition, "1" when the line related to the high-speed line unit 2 is selected,
"0" when the line related to the low-speed line unit 3 is selected
Take This input C specifies only the selection of the line, but does not specify whether or not the line is used.

Input D: Indicates the effective use state of the line before the transition, and takes "0" when the line related to the high-speed line unit 2 or the low-speed line unit 3 is used and "1" when it is not used. .

Input E: "0" is taken during reset processing such as power-on of the line section 2 or 3 or the line exchange section 1, and "1" at other times.

Next, the state transitions performed according to the contents of these inputs A to E will be described.

The state transition is a transition (state holding) from the state S3 to the state S3. The state transition is the line section 2 or 3
This is done when the power of the line switching unit 1 is turned on, or when the cables 13 and 14 from any of the line units 2 and 3 are not connected.

The state transition is a transition from the state S3 to the state S1. The state transition is performed when only the cable 13 from the high speed line section 2 is connected in the unused state of the line.

The state transition is a transition (state holding) from the state S1 to the state S1. The state transition is performed when either one of the cable connection from the high-speed line unit 2 and the cable connection from the low-speed line unit 3 is detected. For example, the cable connection from the high-speed line unit 2 and the low-speed line unit 3
This state transition takes place even if a cable connection from (to be made later) is simultaneously detected. The state S1
The reason why this state transition is performed even when only the cable connection from the low-speed line section 3 is detected is that the maintenance personnel mistakenly finds that the cable on the working line side is not connected because both cables 13 and 14 are connected. This is because even if the cable (the cable 13 from the high-speed line unit 2) is removed, the state S1 is maintained and an alarm is given to warn that the double connection is still performed.

The state transition is a transition from the state S1 to the state S3. The state transition is performed when both cables 13 and 14 are unplugged and when the reset process is started. This is an essential transition when it is desired to change the connection between the line units 2 and 3 and the line switching unit 1 without turning the power off and on.

The state transition is a transition from the state S3 to the state S2. The state transition is performed when only the cable connection from the low speed line section 3 is detected in the unused state of the line.

The state transitions from the state S2 to the state S2 and the state transitions from the state S2 to the state S1 are transitions centered on the line related to the low-speed line unit 3, and the above-mentioned state transitions and It is similar, and detailed description thereof will be omitted.

FIG. 4 shows the state transitions defined in this way.
Is a Karnaugh map showing the relationship between the contents of inputs A to E and new transition states S1 to S3. In addition, in FIG. 4, A , B , C , D , and E represent the inverted logic levels of A, B, C, D, and E, respectively.

The respective states S1 to S3 that transit as described above
Must define the outputs for controlling the conduction of the receivers 26R1 to 26R3 and the drivers 26D1 to 26D3 and the receiver 27R and the driver 27D as described above, and are not given from the outside of the first-come-first-served circuit 25. The outputs that determine the timing inputs C and D must be defined.

Here, the output that controls conduction of the receivers 26R1 to 26R3 and the drivers 26D1 to 26D3 is F, the output that controls conduction of the receiver 27R and the driver 27D is G, the output that determines the input C at the next timing is H, and the output that determines the input C at the next timing is H. The output that determines the input D at the timing of is I.

FIG. 5 shows the states S1 to S3 and the outputs F to I.
It shows the relationship with the logic level of.

As described above, the state S1 is the high speed line section 2
It is in the state where the line related to the above is effectively used, and the state S3
Then, in order to eliminate the uncertain state of continuity control, the high-speed line unit 2
It is assumed that the output F takes "1" in the states S1 and S2 because the receiver and the driver that are inserted in the line according to (1) are brought into conduction. Therefore, it is assumed that the output G having an exclusive relationship takes "1" in the state S2.

Also, the output H which becomes the input C at the next timing, which indicates whether the line related to the high speed line unit 2 or the line related to the low speed line unit 3 is selected in the present state.
Is "1" in the states S1 and S3 in which the receiver and the driver inserted in the line related to the high-speed line unit 2 are conducted, and is eventually equal to the output F.

Further, the output I, which is the input D at the next timing, indicates whether or not the line related to the line section 2 or 3 is being used in the present state, so that in the used states S1 and S2. It takes "0" (logic level of the use state of the input D).

Therefore, each output F to I and its inverted output F
~ I are represented by the following logical relational expressions by rearranging the Carnot diagram shown in FIG. 4 based on the contents of FIG.

[0064] F = E + B C + AD + C D + AB + BC ... (1) F = A CD E + A B CD E + A BCDE ... (2) G = F ... (3) G = F ... (4) H = F ... (5) H = F (6) I = E + AB + C D + ABD (7) I = A D E + B D E + A B CE + A BCE (8) FIG. 6 shows the first-arrival priority circuit 25 according to this embodiment. 2 shows a configuration of a main part. The first-come-first-served circuit 25 of this embodiment is
The configuration takes into consideration the above-mentioned equations (2), (4), (5) and (8).

In FIG. 6, AND circuits 31 to 33 determine the first to third terms on the right side of the equation (2), respectively, and the NOR circuit 34 obtains the logical product of these and inverts them. The output F (H) is obtained. The inverter circuit 35 obtains the output G by inverting this. The output F is the receiver 26R1 to 2 described above.
6R3 and the conduction control terminals of the drivers 26D1 to 26D3, and the output G is given to the conduction control terminals of the receiver 27R and the driver 27D described above.

The output H (equal to F) sent from the NOR circuit 34 is given to the D-type flip-flop circuit 36, latched by the clock CLK, and becomes the input C in the next state determination. The clock CLK defines the state determination cycle, and is selected to be shorter than the cycle for detecting fixed patterns and changing points in the cable connection detection circuits 23 and 24, for example.

The AND circuits 37 to 40 are for obtaining the first to fourth terms on the right side of the equation (8), respectively, and the NOR circuit 41 obtains the logical product of these and inverts it to obtain the output I. It is a thing. The output I is latched by the D flip-flop circuit 42 by the clock CLK and becomes the input D in the next state determination.

In the first-come-first-served circuit 25 having the above configuration, when the line units 2 and 3 and the line switching unit 1 are in the process of starting up the power supply and the input E is "0", all the AND circuits 31 to 31.
The outputs from 33 and 37-40 are "0". Therefore,
The outputs of the NOR circuits 34 and 41 are "1", and the output F,
G, H, and I are "1", "0", "1", and "1", respectively.
Becomes the state S3. As a result, the receiver 26R
1-26R3, 27R, and drivers 26D1-26
D3 and 27D are in the conduction control state defined by the state S3.

In this state S3, when "1" is input to the input A and "0" is input to the input B, that is,
Cable 13 from high-speed line 2 after reset processing
When only the connection is detected, the output of the AND circuit 39 becomes "1", and the outputs of the other AND circuits become "0". Therefore, the NOR circuit 34 outputs "1" and the NOR circuit 41 outputs "0", and the outputs F, G, H and I are respectively "1",
The state changes to "0", "1", "0", and transits to the state S1. If the input content is maintained thereafter, this state S1 is continuously held. At this time, the receivers 26R1 to 26R
3, 27R and drivers 26D1 to 26D3, 27
D is the conduction control state defined by the state S1, that is, the conduction control state in which the line related to the high-speed line unit 2 is valid.

In such a state, the input B is "1".
Even if the cable 14 from the low-speed line unit 3 is also connected, the flip-flop circuit 42 holds "0" and the flip-flop circuit 36 holds "1". 33, 39 and 40 output "0", AND circuits 37 and 38 output "1", NOR circuit 34 outputs "0" and NOR circuit 41 outputs "1". Hold.

In this state S1, if both inputs A and B become "0", that is, if the cable 13 from the high-speed line section 2 which has been connected up to now is also removed, all the AND circuits 31 to 31. The outputs from 33, 37 to 40 become "0", the outputs from the NOR circuits 34 and 41 both become "1", and the state transits to the state S3.

Although the case where the line related to the high-speed line unit 2 is prioritized has been described above, the operation when the line related to the low-speed line unit 3 is prioritized is almost the same, and the description thereof will be omitted.

Although not shown, the first-come-first-served circuit 2
5 is, for example, “01” or “11” in the state S1.
When the inputs A and B are input, or when the inputs A and B of "10" or "11" are input in the state S2, a configuration is provided for generating an output for notifying a cable connection abnormality. There is.

[0074] Effect According to embodiments of the examples, a receiver and a driver for high-speed connector 21, as well as completely separate the receiver and driver for the low-speed connector 22, the output from the cable connection detection circuit 23 and 24 Based on the above, the first-arrival priority circuit 25 controls the conduction of the receiver and the driver so as to enable the line with the line section related to the cable connected first, so that both cables are violated in violation of the premise of exclusive connection. It is possible to prevent the occurrence of a line failure even when the two are connected at the same time.

Further, by notifying the connection state of the cable or the internal state of the first-arrival priority circuit, the maintenance person can be notified of the connection abnormality or the like.

Other Embodiments FIGS. 7 to 9 are circuits for realizing the first-come-first-served priority circuit 25, which are different from those shown in FIG. 7 is constructed by focusing on the expressions (1), (4), (5), and (7) among the logical relational expressions described above, and the detailed description thereof will be omitted. In FIG. 8, the output F to the receivers 26R1 to 26R3 and the drivers 26D1 to 26D3 related to the high-speed line unit 2 and the output G to the receiver 27R and the driver 27D related to the low-speed line unit 3 are the same (F = G). Fig. 6
The inverter circuit 35 in FIG. In this case, the receivers 26R1 to 26R1 related to the high-speed line unit 2
The 26R3 and the drivers 26D1 to 26D3, and the receiver 27R and the driver 27D related to the low-speed line unit 3 are those that operate reversely when a control signal of the same logic level is given. Also in FIG. 9, the receivers 26R1 to 26R3 and the drivers 26D1 to 2 related to the high-speed line unit 2 are used.
The output F for 6D3 is the same as the output G for the receiver 27R and driver 27D related to the low-speed line unit 3 (F
= G), and the inverter circuit 50 in FIG. 7 is omitted.

In the above embodiment, one low-speed line unit 3 connectable to the line switching unit 1A is shown, but the number of low-speed line units 3 corresponding to the number of input / output lines of the time division circuit 10 is shown. The present invention can be applied to a circuit switching unit that can be connected to. For example, in this case, the cable connection detection circuit 24
Is only required to output a significant detection signal if any one cable from the low-speed line section is connected. Similarly, a plurality of high-speed line units 2 may be connectable.

That is, in the above-described embodiment, each set has one device connector having the same function, but each set may have two or more device connectors. In this case, it is not necessary to make an alternative cable connection for the same set.

Further, in the above embodiment, the present invention is applied to two kinds of line parts, but the present invention can be applied to three or more kinds of line parts.

Further, in the above-mentioned embodiment, the presence or absence of the cable connection is detected by using the fixed pattern. However, the mechanical switch or the optical path whose position is variable when the connector is not connected is intermittent. The optical switch may be provided to detect the cable connection.

Furthermore, the present invention can be applied not only to prevent the inconvenience caused by the multiple connection of the line cables of the transmission / switching device, but also to prevent the inconvenience caused by the multiple connection of the cables of other devices. it can.

[0082]

As described above, according to the present invention, two or more sets of device connectors correspond to the input / output of the common processing section, and the cable connector is connected to any one set of one or more device connectors. In the cable connection device that is assumed to be performed, it corresponds to each of the device connectors of each set, and corresponds to each of the device driver of each set and the transmission driver and the receiver of which conduction and non-conduction are controlled. hand,
A cable connection detection circuit that detects the connection of the cable connector based on a fixed pattern from the external processing unit or a physical sensor, etc., and the first arrival / last arrival of the detection signal from each cable connection detection circuit is determined, and the first arrival Since a first-come-first-served circuit that connects only the transmission driver and the reception receiver connected to the device connector corresponding to the cable connection detection circuit that outputs the detection signal is provided, a common processing unit can be used to connect multiple types of cables by connector connection. It becomes possible to prevent each part from malfunctioning even when a plurality of types of cables are connected in violation of the premise of connecting to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment.

FIG. 2 is a block diagram showing a conventional cable connection configuration.

FIG. 3 is a state transition diagram for the first-come-first-served circuit of the embodiment.

FIG. 4 is a Karnaugh map for the first-come-first-served circuit of the embodiment.

FIG. 5 is an explanatory diagram of a relationship between a state and an output of the first-arrival priority circuit according to the embodiment.

FIG. 6 is a block diagram showing a detailed configuration of a main part of a first-come-first-served circuit of the embodiment.

FIG. 7 is a block diagram showing another implementation example (1) of the first-arrival priority circuit.

FIG. 8 is a block diagram showing another implementation example (No. 2) of the first-arrival priority circuit.

FIG. 9 is a block diagram showing another implementation example (3) of the first-arrival priority circuit.

[Explanation of symbols]

1A: line switching unit (common processing unit), 2 ... high speed line unit (external processing unit), 3 ... low speed line unit (external processing unit), 10 ... time division circuit, 11a ... high speed connector (device connector),
11b ... Cable connector 12a related to high-speed line unit 2
... low speed connector (device connector), 12b ... cable connector relating to low speed line section 3, 13 ... cable from high speed line section 2, 14 ... cable from low speed line section 3, 23
... Cable connection detection circuit related to high-speed line unit 2, 24 ... Cable connection detection circuit related to low-speed line unit 3, 25 ... First-come-first-served circuit, 26R1 to 26R3 ... Receiver related to high-speed line unit 2, 26D1 to 26D3 ... High-speed line unit 2, driver 27R ... Receiver related to low speed line unit 3, 27D ... Driver related to low speed line unit 3.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04L 12/50 8732-5K H04L 11/20 103 Z

Claims (6)

[Claims] 1. The input / output of a common processing unit corresponds to two or more sets of device connectors, and a cable connector is connected to one or more sets of one or more device connectors, and the common processing unit and a cable are connected. In the cable connection device in which the transmission path to the external processing unit is electrically connected, the connection is made in correspondence with each of the device connectors of each set,
A transmission driver and a reception receiver whose non-conduction is controlled, a cable connection detection circuit that detects the connection of the cable connector corresponding to each of the above-mentioned device connectors of each set, and a detection signal of each cable connection detection circuit. A first-arrival priority circuit that determines first-arrival or later-arrival and outputs only the first-arrival detection signal to the device connector corresponding to the cable connection detection circuit and that conducts only the transmission driver and the reception receiver is provided. Cable misconnection compensation circuit. 2. The input / output of the common processing unit corresponds to two or more sets of device connectors, and a cable connector is connected to any one set of one or more device connectors, and the common processing unit and the cable are connected. In the cable connection device in which the transmission path is electrically connected to the external processing unit, the external processing unit is provided with a fixed pattern generator for generating a fixed pattern to be inserted into the signal train conducted in the cable, and the common processing unit side is provided. Corresponding to each of the above-mentioned device connectors of each group,
A transmission driver and a reception receiver whose non-conduction is controlled, a cable connection detection circuit for detecting the connection of the cable connector based on the fixed pattern, corresponding to each of the device connectors of each set, and each cable connection detection circuit. Provided is a first-come-first-served circuit that determines first-arrival or later-arrival of the detection signal from the circuit and connects only the transmission driver and the reception receiver connected to the device connector corresponding to the cable connection detection circuit that outputs the first-arrival detection signal. A cable misconnection compensation circuit characterized in that 3. A method for detecting the cable connection by the cable connection detection circuit is set in advance by a fixed pattern inserted into a signal train in which the external processing unit conducts in the cable and the cable connection detection circuit. The cable erroneous connection compensation circuit according to claim 2, characterized in that matching with a fixed pattern is checked. 4. The cable misconnection compensation circuit according to claim 2, wherein the fixed pattern output from the fixed pattern generator is a mixture of “0” and “1”. 5. The method of detecting the cable connection by the cable connection detection circuit is a fixed pattern "0" to "1" inserted in a signal string in which the external processing unit conducts in the cable, or " 1 "
5. The cable misconnection compensation circuit according to claim 4, wherein the change point from 0 to "0" is detected. 6. The common processing unit is a line switching unit, and the external processing unit is a line unit that performs line terminating processing, multiplexing processing, and the like. Cable misconnection compensation circuit.