JPH0548278A - Slot insertion-type signal processing board - Google Patents

Abstract

PURPOSE:To eliminate that the delay of an input/output signal affects a maintenance operation by a method wherein a delay circuit whose delay amount is the same as the delay amount of an expander board is laid in either a signal input route or a signal output route and the delay amount of the delay circuit is changed to 0 in the maintenance operation. CONSTITUTION:On a signal processing board 5, switches S and delay circuits D are laid respectively between a signal input connector part 51 and a signal processing part 52 as well as between the signal processing part 52 and a signal output connector part 53. The delay amount of the delay circuits D is set to the same as a delay amount generated via an expander board 4. Whether the switches S output an input signal directly or output it through the delay circuits D can be selected by a manual operation. The expander board 4 is formed in the same size as the signal processing board 5. Thereby, it is possible to achieve that the delay of an input/output signal by the use of the expander board 4 does not affect a maintenance operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot insertion type signal processing board which is inserted into a slot provided in a system unit such as a communication device.

[0002]

2. Description of the Related Art Conventionally, in a system such as a communication device, the same signal processing is performed on a plurality of channels and it is possible to cope with the increase or decrease of the number of channels thereafter.
The same signal processing circuit is formed on a plurality of boards and mounted on the system unit. Further, in order to facilitate maintenance work such as inspection / adjustment and component replacement, the signal processing circuit may be divided according to function, and each divided circuit may be formed on a plurality of boards and mounted on a system unit.

The above-mentioned mounting is realized by inserting a signal processing board 2 corresponding to a predetermined slot provided in the system unit 1 and connecting to a mother board 3 provided at the back of each slot, as shown in FIG. To be done. When performing maintenance work such as inspection / adjustment of the operation state of the signal processing board 2, it is difficult to put a hand or visually check it because the slot interval is narrow. Therefore, when performing such maintenance work, pull out the board 2 once,
It is connected to the motherboard 3 with an expander board interposed.

However, even if the expander board is used as described above, if the expander board is removed and reinserted into the slot after the adjustment work is completed, the input / output signals are delayed due to the signal delay caused by the expander board. There is a case where the phase relationship of is changed and the operation does not always follow the adjustment.

[0005]

As described above, in the conventional slot insertion type signal processing board, when the expander board is used for maintenance work such as inspection and adjustment, the signal delay caused in the expander board is delayed. As a result, the phase relationship between the input and output signals changes, so that the correct inspection and adjustment may not always be performed.

The present invention has been made to solve the above problems, and provides a slot insertion type signal processing board which has a simple structure and in which the delay of input / output signals due to the use of an expander board does not affect maintenance work. The purpose is to

[0007]

To achieve the above object, an insertion type signal processing board according to the present invention includes a delay circuit having the same delay amount as that of an expander board.
It is characterized in that the delay amount of the delay circuit is switched to 0 at the time of maintenance work using the expander board by interposing it in at least one of the signal input path and the signal output path.

[0008]

In the insertion type signal processing board having the above configuration, the delay amount generated in the expander board in the signal path is given in the normal state where the expander board is not interposed, and the delay amount is set to 0 when the expander board is used. The phase relationship of input / output signals is kept constant regardless of switching or the use of an expander board.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. However, in FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 1A shows the configuration when the expander board 4 is not used, and FIG. 1B shows the configuration when the expander board 4 is used. The signal processing board 5 includes a signal input connector section 51, a signal processing section 52, and a signal processing section 52.
And a signal output connector section 53, a switch S and a delay circuit D are respectively interposed.

The delay amount of the delay circuit D is set to be equal to the delay amount generated through the expander board 4. Further, the switch S can manually select whether to directly output the input signal or output it through the delay circuit D.

The expander board 4 has the same size as the signal processing board 5, and the input / output connector section 4 for connecting the mother board 3 and the signal processing board 5 to both ends thereof.
1 to 44 and signal lines 45 and 46 are provided.

That is, as shown in FIG. 1A, in a normal operating state where the expander board 4 is not used, each switch S in the input / output path is connected to the delay circuit D side and the expander board 4 is connected. Give the amount of delay that occurs when using. In addition, in order to perform maintenance work such as inspection and adjustment,
When the expander board 4 is interposed as shown in FIG. 1B, the switch S is switched to the through side and the delay amount is set to zero. In this way, by providing the delay amount due to the use of the expander board 4 even when the expander board 4 is not used, the phase relationship of the input / output signals can be kept constant regardless of whether or not the expander board 4 is used.

Therefore, the signal processing board 4 having the above-described structure has a simple structure in which the switch S and the delay circuit D are simply provided, and the phase relationship of the input / output signals is constant regardless of whether the expander board 4 is used or not. Therefore, even if the board 4 is removed and connected to the mother board 3 after adjusting using the expander board 4, the same adjustment result can be maintained and the delay of the expander board 4 can be reduced. Maintenance work can be prevented from being affected.

In the above embodiment, the switch S is described as a manual switch, but it goes without saying that the switch S may be automatically switched to the through side at the time of connection with the expander board 4. Needless to say, the present invention can be similarly implemented even if various modifications are made without departing from the scope of the present invention.

[0016]

As described above, according to the present invention, it is possible to provide a slot insertion type signal processing board which has a simple structure and in which the delay of the input / output signals due to the use of the expander board does not affect the maintenance work.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a slot insertion type signal processing board according to the present invention.

FIG. 2 is a perspective view showing a configuration of a conventional slot insertion type signal processing board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... System unit, 2 ... Signal processing board, 3 ... Motherboard, 4 ... Expander board, 41-44 ... Input / output connector part, 45,46 ... Signal line, 5 ... Signal processing board, 51 ... Signal input connector part, 52 ... Signal processing unit,
53 ... Signal output connector section, S ... Switch, D ... Delay circuit.

Claims (1)

[Claims] 1. Inserted into a slot provided in a system unit and connected to a mother boat of the unit,
A slot insertion type signal processing board formed with a signal processing circuit for subjecting an input signal supplied from the mother board to a predetermined processing and outputting the processed signal to the mother board, which is connected to the mother board via an expander board during maintenance work. In, a delay circuit having the same delay amount as that of the expander board and the delay circuit is interposed in at least one of the signal input path and the signal output path, and the delay circuit delays during the maintenance work. A slot insertion type signal processing board comprising a delay amount switching means for switching the amount to 0.