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User Manual
8
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+680
Ω
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)
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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+680
Ω
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: 600
Ω
¾
Input loop impedance: 600
Ω
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.
