JPH11275063A - Digital transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a digital transmitter of simple configuration and low power consumption. SOLUTION: Interface sections 25-28 and clock sections 21-24 of a signal processing section 29 between data transmitter-receiver sets are configured redundantly. Furthermore, a couple of clock reception sections and clock distribution sections are connected redundantly to the signal processing section 29. Furthermore, an individual on-board power supply is provided to each section connected redundantly. Moreover, the transmitter is provided with a 2:1 selector that supplied power from the on-board power supply energized by a supplied power and selects either of two clock inputs, whether the transmitter is in an active state or in a standby state is recognized by an active/standby control signal. When the transmitter is in the active state, the transmitter is operated normally. When the transmitter is in a standby state, a function of stopping power supply, of stopping the output power of the on-board power supply or stopping a clock input is brought into the standby state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital transmission apparatus, and more particularly to a digital transmission apparatus having a redundant configuration.

[0002]

BACKGROUND OF THE INVENTION With the development of networks, the need to transmit large amounts of digital data over transmission lines is increasing. Modern society is highly dependent on computers, and if a failure occurs in a digital transmission device connecting these computers, the effect is extremely large.

Therefore, it is essential for a digital transmission device to improve reliability and to quickly recover from a failure should it occur. For this reason, the digital transmission device adopts a redundant configuration, and in the event that a failure occurs in one of the devices, immediately switches to the spare device to recover from the failure and minimize service downtime. This is commonly done.

As a digital transmission device having such a redundant configuration, a configuration as shown in FIG. 3 can be considered. It is assumed that digital data is transmitted and received between the device 17 and the device 20. The devices 17 and 20 include transmission circuits 17a and 20a, respectively, and a two-to-one selector 17 for selecting data received from a partner device.
b, 20b. Between the two devices 17 and 20,
A pair of devices 18 and 19 in a redundant configuration are arranged,
Operating power is supplied to power supply circuits 8 and 19 from a power supply circuit PS, and a clock pulse is input from a clock generator CLK.

According to the digital transmission device having such a redundant configuration, the transmission data of the device 17 is transmitted from the transmission circuit 17a to the device 1
8 or 19 via the 2: 1 selector 20b. Similarly, the transmission data of the device 20 is
a is received by the two-to-one selector 17b of the device 17 via the device 18 or 19. Thus, the device 18,
19 has a redundant configuration, so that the active device (for example, 1
In the event that 8) fails, it is quickly switched to a standby device (for example, 19) and communication is maintained. According to this configuration, the probability that both devices 18 and 19 will fail at the same time is extremely low, so that the reliability of data communication between both devices 17 and 20 is improved. In other words, it enables digital transmission substantially always.

[0006]

According to the redundant digital transmission device as shown in FIG. 3, the pair of devices 18 and 19 can be quickly replaced (switched), but the pair of redundant devices 1
In addition to the fact that the devices 8 and 19 are required, not only is the device expensive, but also the devices 18 and 19 are constantly supplied with operating power from the power supply circuit PS and input with the clock CLK, so that the power consumption is large and the operation efficiency is poor. There is a disadvantage that.

It is an object of the present invention to provide a digital transmission device having a relatively simple configuration and relatively low power consumption.

[0008]

In order to solve the above-mentioned problems, a digital transmission device according to the present invention employs the following characteristic configuration.

(1) In a digital transmission device in which a signal processing device is connected between the first and second devices for transmitting and receiving digital data between the first device and the second device, the signal processing device includes A digital transmission device in which a pair of interface units is redundantly connected and is selectively used as a working or protection device.

(2) The digital transmission device according to (1), wherein a pair of a clock receiving unit and a clock distribution unit are redundantly connected to the signal processing device.

(3) The digital transmission device according to (1) or (2), wherein the redundant connection section has a separate on-board power supply.

(4) A two-to-one selector is provided for receiving power from an on-board power supply to which power is supplied from a power supply and selecting one of two clock inputs. It recognizes whether it is a standby system and operates normally in the case of the active system.
The digital transmission device according to (1), in which the function of stopping the output power of the on-board power supply 34 or stopping the clock input is set to a standby state.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the digital transmission apparatus according to the present invention will be described below with reference to the accompanying drawings, in particular, FIGS.

FIG. 1 is a block diagram showing a configuration of a preferred embodiment of a digital transmission apparatus according to the present invention. The signal processing unit 29 includes a main signal 0 system (for example, working) interface unit 25,
27 and main signal 1 system (for example, spare) interface unit 2
6, 28 are connected in a redundant configuration. In the signal processing unit 29, clock receiving units 21 and 22 and clock distribution units 23 and 24 of the clock 0 system and the clock 1 system are redundantly configured. These interface units 25 to 28,
Clock receivers 21 and 22 and clock distributors 23 and 2
4 has a switching control unit 32 for generating a switching control signal 31. In addition, a power supply circuit PS for supplying operating power to all the above-described elements is provided. Switching control unit 3
2, an alarm 30 from each unit is input.

As described above, since the interface units 25 to 28 and the clock units 21 to 24, which are likely to cause a failure, have a redundant configuration, and the other units have a single configuration, the configuration is relatively simple and the cost and power consumption are low. A digital power transmission device can be realized.

FIG. 2 is a configuration block diagram showing a configuration suitable for reducing power consumption in the redundant configuration of FIG. An on-board power supply (for example, a switching regulator) 34 to which power is supplied from a power supply 33, and a two-to-one receiving the output power and selecting clock inputs 35 and 36
The circuit includes a selector 39 and a circuit 42 that inputs and outputs the input signal 37 and the output signal 38. The device receives a working / standby control signal 40 and a test signal 41 and generates an alarm signal 43.

In the apparatus shown in FIG. 2, the active / standby control signal 40 is used to identify whether the system is active or standby. In the case of the active system, it operates normally. If it is a standby system,
The function is put on standby in any of the streets. The power supply 33 is stopped. The output power of the on-board power supply 34 is stopped. The clock inputs 35 and 36 are stopped. In these three methods, the power consumption reduction effect decreases in the order from the beginning.

Although the preferred embodiment of the digital transmission apparatus of the present invention has been described in detail, various modifications and changes can be made without departing from the gist of the present invention.

[0019]

As described above, according to the digital transmission apparatus of the present invention, since the interface section and the clock section have a redundant configuration, the configuration of the apparatus is simple and inexpensive, and it is stable with low power consumption. This has a practical effect that a digital transmission device can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram illustrating an example of a preferred embodiment of a digital transmission device according to the present invention.

FIG. 2 is a block diagram of a digital transmission device for reducing power consumption according to an embodiment of the present invention.

FIG. 3 is a block diagram of a digital transmission device having a redundant configuration.

[Explanation of symbols]

 17 First device 20 Second device 29 Signal processing unit 25-28 Interface unit 21, 22 Clock receiving unit 23, 24 Clock distribution unit 34 On-board power supply 32 Switching control unit

Claims (4)

[Claims] 1. A digital transmission device in which a signal processing device is connected between said first and second devices for transmitting and receiving digital data between a first device and a second device, wherein said signal processing device has one pair. The digital transmission device is characterized in that the interface unit is redundantly connected and is selectively used as an active or a standby. 2. The digital transmission device according to claim 1, wherein a pair of a clock receiving unit and a clock distribution unit are redundantly connected to the signal processing device. 3. The digital transmission device according to claim 1, wherein the redundant connection unit has a separate on-board power supply. 4. A two-to-one selector for receiving power from an on-board power supply to which power is supplied from a power supply and selecting one of two clock inputs, and using a current / standby control signal to determine whether a current system or a standby system is used. It recognizes whether it is a system, operates normally in the case of the active system, stops the power supply 33 in the case of the standby system, stops the output power of the on-board power supply 34,
2. The digital transmission device according to claim 1, wherein a function of stopping clock input is set to a standby state.