JPS5847900B2 - Subscriber selection key circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subscriber selection key circuit in an exchange desk, and more particularly to a subscriber selection key circuit for calling a subscriber with a single touch.

It is well known that dial keys (or numeric keys) are used to send subscriber selection information from an exchange desk to an exchange, but there are other methods used in relatively small-scale private branch exchanges. DSS (Direct Station) allows you to call subscribers with a single touch.
selection) function.

As the name suggests, this DSS function has key switches that correspond one-to-one to each subscriber, so the operation is easy to understand, but it requires a large number of key switches.

In this way, in addition to the dial key, the subscriber selection key (D
In an exchange reception desk having a SS key, it is particularly desirable to reduce the number of key information transfer lines as much as possible when sending the key information to the exchange, and to organize and integrate the key information to make the system more economical.

An object of the present invention is to solve the above-mentioned problems, and the purpose is to provide a telephone exchange system including an exchange reception desk, in which a subscriber selection key circuit in the exchange reception desk is connected to the tens digit and one digit of the subscriber number. The subscriber key circuit scans this key matrix and obtains column information (10
means for reading out the line information (1's digit) and the line information (1's digit),
Furthermore, by first transferring the column information (tens' digit) and the row information (1's digit) after a certain period of time, the number of key information lines can be reduced.

In addition, by making the signal format of column and row information the same as the signal format of dial key information (0 to 9) handled by the same system, a large amount of subscriber selection key information can all be consolidated into 0 to 9. The key information can be organized and integrated.

Next, details of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a subscriber selection key circuit having 100 DSS keys according to the present invention, and FIG. 2 is a time chart for explaining the operation of FIG.

In the figure, 1 is a key matrix, 2 is a decoder, 3 is a multiplexer, 4 is a column counter, 5 is a row counter,
Reference numeral 6 denotes a scanning control circuit, 7 a first-place sending circuit, 8 a tenth-place sending circuit, 9 a sending-out control circuit, and 10 to 1γ signal lines.

Next, to explain the operation of FIG. 1, the subscriber selection key circuit is 1.
It has a key matrix 1 with 0 columns and 10 rows.

For example, the cross point of this key matrix is 10μ
s scan pulses, and therefore a total of 100 (
The scanning period of the cross point of IOXIO) is lms.

The scan pulses are sent from the scan control path 6 through the signal line 17 to the column counter 4 and the row counter 5, where they are counted and simultaneously sent to the key matrix.

When the operator presses a certain key to turn it on (time chart ha in Figure 2), the output signal from the column counter is sent to decoder 2.
It is decoded by , and becomes a column selection pulse.

This column selection pulse passes through the cross point of the turned-on key and is applied to the multiplexer 3 on the row side.

When this row is scanned by the row counter, the column selection pulse that has passed through the cross point is sent from the multiplexer 3 to the scan control circuit 6 through the signal line 12 as a row information pulse.

The scan control circuit 6 monitors whether the column selection pulse returns as row information each time one cross point is scanned.

Then, when the row information pulse can be received as a return pulse (time chart b), the scanning garden control device 6
A set signal (time chart c) is sent to the 1st place sending circuit 7 and IO place sending circuit 8 via
The value of the column counter is set in the 10th position sending circuit γ, and at the same time, the sending out control circuit 9 is activated.

The sending control circuit 9 first starts the 10th place sending circuit 8 via the signal line 15 (time chart e), performs control to send the set contents to the 10th place sending circuit, and continues for a certain period of time t.
The first place sending circuit 7 is activated via the rear signal line 14 (time chart f), and control is similarly performed to send out the set contents to the first place sending circuit T.

Note that during such transmission control, a busy signal is sent from the transmission control circuit 9 to the scanning control circuit 6 via the signal line 16, and during this period, the transmission of set signals to the 1st place sending circuit @7 and the 10th place sending circuit 8 is prohibited. (Time chart d).

The contents set in the 10th place sending circuit and the 1st place sending circuit should correspond to the 10th place and 1st place of the subscriber's telephone number, respectively, and the signal format should be the same as the signal format of the dial keys (0 to 9). Therefore, the key information based on the key matrix 1 is similar to a two-digit dial number.

As described above in the embodiment, a key matrix is used in the subscriber selection key circuit of the exchange reception desk, and when the key is turned on, the column information corresponding to the 10th place of the subscriber number and the row information corresponding to the 1st place are displayed. The information is read out and sent to the exchange in the order of the tens digit and the ones digit.

Therefore, according to the present invention, it is possible to reduce the number of information lines between exchange receiving and merging exchanges, and since the exchange side can handle numbers in the same way as dialed numbers from a dial key, existing equipment can be used.
The effects of system economization are significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the subscriber selection key circuit according to the present invention, and FIG. 2 is a time chart for explaining the operation of FIG. 1. In the figure, 1 is a key matrix, 2 is a decoder, 3 is a multiplexer, 4 is a column counter, 5 is a row counter, and 6
Reference numeral 7 indicates a scanning control circuit, 7 indicates a 1st-order sending circuit, 8 indicates a 10th-order sending circuit, 9 indicates a sending-out control circuit, and 10 to 17 indicate signal lines.

Claims (1)

[Claims] 1. In a telephone exchange system including an exchange reception desk, a subscriber selection key circuit in the exchange reception desk associates the columns and rows of the key matrix with the tens digit and the ones digit of the subscriber number, respectively, and selects this key matrix. Scan the key matrix and get the column information (tens place) and row information (
When a key is pressed, this column information (tens place) is first transferred, and after a certain period of time, the row information (
1. A subscriber selection key circuit characterized in that the circuit transmits a digit (1's digit).