Dell 1815dn Service Manual - Page 23
Line Interface Part, usually located. Main functions are Line Interface
UPC - 000061100008
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System Outline 4.1.3 Line Interface Part 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. Service Manual 4-5