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3.2 Down-link sub-card
3.2.1 Sub-card of FXS audio user interface (RC3000-SUB-DS)
¾ Feed: DC –48 V or DC -24 V
¾ Loop current: 18-24 mA standard value 20 mA
¾ Feed ring voltage: AC 65±10 V 25 Hz
¾ Ring stop time: 200 ms
¾ 2W input impedance: 200+680Ω
¾ Gain from 2W to 4W: 0±0.5 db
¾ Frequency characteristic from 2W to 4W: 0±0.2 db
¾ Gain from 4W to 2W: -3.5±0.5 db
¾ Frequency characteristic from 4W to 2W: 0±0.2 db
¾ Return loss: 30-40 db
¾ Balance: 60-70 db
¾ Common-Mode Rejection Ratio: 60-70 db
¾ Power Supply Rejection Ratio: Vcc: 30 db Vbat: 30 db
¾ Idle channel noise: 75 db
3.2.2 Sub-card of FXO audio relay interface (RC3000-SUB-DO)
¾ Ring detect voltage: ≥35 V
¾ Ring detect frequency: 17-63 Hz
¾ Ring not detect frequency: ≤15 V
¾ 2W loop impedance: off-hook status 200+680Ω
on-hook status 2M Ω
¾ Gain from 2W to 4W: on-hook status -0.60 db
¾ Frequency characteristic from 2W to 4W: on-hook status 0±0.2 db
¾ Gain from 2W to 4W: off-hook status 0±0.5 db
¾ Frequency characteristic from 2W to 4W: off-hook status 0±0.2 db
¾ Gain from 4W to 2W: off-hook status -3.5±0.5 db
¾ Frequency characteristic from 4W to 2W: off-hook status 0±0.2 db
¾ Return loss: 30-40 db
¾ Balance: 60-70 db
¾ Common-Mode Rejection Ratio: 60-70 db
¾ Power Supply Rejection Ratio: 30 db
¾ Idle channel noise: 75 db
3.2.3 Sub-card of E&M 2-wire audio relay interface (RC3000-SUB-DM2)
¾ AD gain: 0 db
¾ DA gain: -3.5 db
¾ AD frequency characteristic (300-3400Hz): 0±0.2 db
¾ DA frequency characteristic (300-3400Hz): 0±0.2 db
¾ Output loop impedance: 600Ω
¾ Input loop impedance: 600Ω
¾ Balance: 60-70 db
¾ Return loss: 20 db
¾ Maximum voltage of common-mode: 300 V
¾ Common-Mode Rejection Ratio: >55 db
¾ Power supply Rejection Ratio: 30 db
¾ Idle channel noise: 60 db
Note: AD gain and DA gain are adjustable according to user’s requirement.
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