Raisecom Technology Co., Ltd
20
Ring not detect voltage: ≤15 V
2W input impedance: normal and not ring status: 600Ω
2W input impedance: ring or abnormal status: 1000K Ω
Gain from 2W to 4W: 0±0.5 db
Frequency characteristic from 2W to 4w: 0±0.2 db
Gain from 4W to 2W: -3.5±0.5 db
Frequency characteristics from 4W to 2w: 0±0.2 db
Return loss: 30-40 db
Balance: 60-70 db
Common-Mode Rejection Ratio: 60-70 db
Power supply Rejection Ratio: 30 db
Idle channel noise: 75 db
5.2.11. Interface standard of FXS user-board with polarity reversal
function (RC3000-SUB-DSR)：
Feed voltage: DC –48 V or DC 24 V
Loop current: 18-24 mA standard value 20 mA
Feed ring voltage: AC 65±10 V 25 Hz
Ring stop time: 200 ms
2W input impedance: 200+680Ω
Gain from 2W to 4W: 0±0.5 db
Frequency characteristic from 2W to 4W: 0±0.2 db
Gain from 4W to 2W: -3.5±0.5 db
Frequency characteristic from 4W to 2W: 0±0.2 db
Return loss: 30-40 db
Balance: 60-70 db
Common-Mode Rejection Ratio: 60-70 db
Power Supply Rejection Ratio: Vcc: 30 db Vbat: 30 db
Idle channel noise: 75 db
5.3. Power supply
Input voltage: DC -48V, tolerance range -36V～ -72V
AC 220V, tolerance range 85～265V
Module power: general≤20W, maximum≤40W
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