Telephone line status

Telephone line status

Description of Service

Index case of the telephone line Telephone case indicator
You can use this control circuit devices and whether the line is busy or not


Explain the circuit

When you make a headset devices
Diode connected to the optical own light pointing to the use of the phone line by
That device.
Pena here if you use two phone and Dieudin optical stages can be repeated for more
So
Put this circuit in the control room where the wires are distributed to the rest room
Container on the subsidiary bodies.


Action

Allocated to each branch bridge determines the direction of the current calendar, which will pass through your phone
This section
When you pick up the phone in a Alfrat stream passes the limits of the range between -20 mA 50
mA Diode light gives light for this Alfrap
Working resistance 100 ohms to exceed all the current passing through the optical Aldieud 20
MA
You can use Dieudat optical diameters of 5 mm or 10 mm and color that you want -
Could indicate circuit status Alfrat in the case of a short or leakage across the line as a result of
Moisture or malfunction of the device is located in the Alfrap.

Illuminate all diodes light at incoming ring signal - to indicate that all devices
Receive the ring signal


Circuit diagram