Raisecom
RC3000-15 (P100R001) Hardware Description
8 Voice cards
Raisecom Proprietary and Confidential
Copyright © Raisecom Technology Co., Ltd.
82
Table 8-16
Parameters of the interface on the 16E&M/8E&M/4E&M card
Parameter
Description
Coding scheme
A-law
Bit rate
64 kbit/s
Audio port impedance
On-hook impedance is 2 MΩ.
Off-hook loopback impedance is 600+200//0.1.
Effective transmission
bandwidth
300–3400 Hz/600 Ω
Gain frequency features
The Rx (A/D) gain ranges from -3 to 27 dB. The default value
is controlled by the internal jumper. Its step is 0.1 dB.
The Tx (D/A) gain ranges from -13 to 7 dB. The default value
is controlled by the internal jumper. Its step is 0.1 dB.
Frequency distortion
300–3000 Hz; < 0.5 dB
3000–3400 Hz; < 3.0 dB
Total distortion (1020
Hz)
0 to -30 dBm0; < 33 dB
-30 to -40 dBm0; < (33–22) dB
-40 to -45 dBm0; < 22 dB
Gain change according
to level
+3 to -40 dBm0; ∆ < 0.5 dB
-40 to -50 dBm0; ∆ < 1.0 dB
-50 to -55 dBm0; ∆ < 3.0 dB
Degree of unbalance
about earth
300–600 Hz: > 40 dB
600–2400 Hz: > 46 dB
2400–3400 Hz: > 41 dB
Idle channel noise
< -67 dBm0p
Feed voltage (off-hook) Typical -48 V
Feed current
Typical 20 mA
Ringing voltage
Typical 60 V/30 Hz
Return loss
300–600 Hz: > 12 dB
600–3400 Hz: > 15 dB
