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3.2 Down-link sub-card
3.2.1 Sub-card of FXS audio user interface (RC3000-SUB-DS)
3.2.2 Sub-card of FXO audio relay interface (RC3000-SUB-DO)
3.2.3 Sub-card of E&M 2-wire audio relay interface (RC3000-SUB-DM2)
Note: AD gain and DA gain are adjustable according to user's requirement.
Feed:
Loop current:
Feed ring voltage:
Ring stop time:
2W input impedance:
Gain from 2W to 4W:
Frequency characteristic from 2W
Gain from 4W to 2W:
Frequency characteristic from 4W
Return loss:
Balance:
Common-Mode Rejection Ratio:
Power Supply Rejection Ratio:
Idle channel noise:
Ring detect voltage:
Ring detect frequency:
Ring not detect frequency:
2W loop impedance:
Gain from 2W to 4W:
Frequency characteristic from 2W
Gain from 2W to 4W:
Frequency characteristic from 2W
Gain from 4W to 2W:
Frequency characteristic from 4W
Return loss:
Balance:
Common-Mode Rejection Ratio:
Power Supply Rejection Ratio:
Idle channel noise:
AD gain:
DA gain:
AD frequency characteristic (300-3400Hz): 0±0.2 db
DA frequency characteristic (300-3400Hz): 0±0.2 db
Output loop impedance:
Input loop impedance:
Balance:
Return loss:
Maximum voltage of common-mode:
Common-Mode Rejection Ratio:
Power supply Rejection Ratio:
Idle channel noise:
DC –48 V or
DC -24 V
18-24 mA standard value 20 mA
AC 65±10 V
200 ms
200+680Ω
0±0.5 db
to 4W:
0±0.2 db
-3.5±0.5 db
to 2W:
0±0.2 db
30-40 db
60-70 db
60-70 db
Vcc: 30 db
75 db
≥35 V
17-63 Hz
≤15 V
off-hook status 200+680Ω
on-hook status 2M Ω
on-hook status -0.60 db
to 4W: on-hook status 0±0.2 db
off-hook status 0±0.5 db
to 4W: off-hook status 0±0.2 db
off-hook status -3.5±0.5 db
to 2W: off-hook status 0±0.2 db
30-40 db
60-70 db
60-70 db
30 db
75 db
0 db
-3.5 db
600Ω
600Ω
60-70 db
20 db
300 V
>55 db
30 db
60 db
User Manual
25 Hz
Vbat: 30 db
8
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