This is Connection Part between system and PSTN(Public Switched Telephone Network), and primary circuit is usually
located. Main functions are Line Interface, Telephone Connection and Line Condition Monitoring.
1 Telephone Line Connection
Modular Plug : RJ-11C
LIU PBA Modular Type : 623 PCB4-4
Line Code Length : 2500 50mm
Line Code Color : Black
ON HOOK state Characteristic
1) DC Resistance
DP Dial Mode (Direct Current 30mA) : 50 ~ 300ohm
DTMF Dial Mode (Direct Current 20mA) : 50 ~ 540ohm
2) Ring Sensitivity
Ring detection Voltage : 40Vrms 150Vrms (condition : Current = 25mA, Frequency = 15Hz)
product Margin : 30Vrms 150Vrms
Ring detection Frequency : 15.3Hz 68Hz (condition : Voltage = 45Vrms, Current = 25mA )
product Margin : 15Hz 70Hz
Ring detection Current : 20mA 100mA (condition : Voltage = 40Vrms, Frequency = 20Hz)
product Margin : over 15mA
3) False Ring Sound
Ring Frequency : 750 Hz + 1020 Hz
Ring interrupt Cycle : On/Off depending on input Ring Signal Cycle.