SU440806A1 - Device control device for local PBX - Google Patents

Description

one

The invention relates to an automatic switching technique and is intended to control the devices of a local PBX when a subscriber dials a number using a keyboard.

Device control devices for local PBX are known with the help of a keyboard; however, the presence of generators in the subscriber unit reduces the reliability, complicates the circuit of the device and increases its cost.

The purpose of the invention is to simplify the scheme of a subscriber telephone set, increase its elemental reliability and reduce cost.

For this purpose, the tone frequency generators in the register equipment are connected via clamps of the generated frequencies to the subscriber line, and filters connected through the corresponding contacts to the two-wire subscriber line are inserted into the keyboard dialer.

The drawing shows a diagram of the proposed device.

The device contains a subscriber telephone set 1, conversational and calling devices 2 telephone sets, dial pad 3, block 4 of dial pad dial filters, resonant filters 5 tuned to pass frequencies fi, 2, fn, control device 6 of the local PBX

(register), generator block 7 of the control device of the local PBX, generators 8 tonal frequencies f |, f2, ..., fn, latch 9 of the current frequency fi, 2, ... fnl (Ф Ф Фг, .-, Фи) , i-

The contacts of the keyboard, switching when each button is closed, tj, ta, ..., tn are the contacts of the keyboard, which are closed when the buttons corresponding to specific frequencies are pressed.

The proposed device works as follows.

After connecting to the subscriber line control device 6 from the last to the subscriber line and then to the subscriber telephone 1 enters a set

frequencies fi, fa, fn. When received by the subscriber

the signal “readiness of the station, which may be the totality of the specified frequencies, it sequentially presses the buttons of the keyboard,

corresponding to the characters of the required number. At the same time, the contacts t are switched on the keyboard and the contacts ti, which correspond to the necessary frequency ratings fi (i l, 2 ...., n), are closed.

When the subscriber on the keyboard 6 presses the number sign button, which corresponds to, for example, the frequencies fi and fa, the current level latches of the frequencies F 1 and F 3 9 will register current bursts at these frequencies, which is

the local control team

PBX to establish the connection by the number corresponding to the consecutively pressed hooks on the subscriber's telephone tapping pattern.

Subject invention

The control device of the local PBX, which includes a keyboard number, abratel, subscriber device, register equipment, tone frequency generators and a two-wire subscriber line, is characterized in that, to simplify the device, tone frequency generators in the register equipment are connected via latches of generated frequencies to subscriber line, and filters connected through the corresponding contacts to the two-wire subscriber line are entered into the dial pad.

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