User manual

CHAPTER 1： MODEM INTRODUCTION
Table 1-1B : V.34 Symbol Rate and Carrier Frequency
Symbol Rate (Baud) Low Carrier (Hz) High Carrier (Hz)
2400 1600 1800
3000 1800 2000
3200 1829 1920
3429 1959 1959
• Transmit Level Lease-Line: 0~-31 dBm 1 dB stepadjustable.
Dial-Line: 0~-15 dBm 1 dB step adjustable.
•
Line requirement :
４
/
２
wires L-L or D-L
• Line Impedenance : Balance 600Ω ± 10 %
• Return Loss :> 20 dB, 300 - 3400 Hz
•
Longitude Balance :> 60 dB
•
Dial Line Characteristics:
Maximum Current :120 mA
Holding Resistance : 50 ~ 220
Ω
Holding Current : 25 ~ 110 mA
Ring Detect Range : ON - > 27 Vrms
OFF - < 13 Vrms
Ring Detect Frequency : 16 - 50 Hz
DTMF Characteristics : O/P Lowband -8
±
1 dBm
O/P Highband -6
±
1 dBm
Frequency Tolerance
≤ ±
1 %
TONE Duration and Spacing 95 ms (adjustable)
Pulse Per Sec : 10
±
0.5 PPS
Make/Break Ratio : 33/67, 39/61
±
3 %
•
Auto Answer : V.32bis/V.32/V.22bis/V.22 comply with ITU-T V.25 &
V.25bis
V.34 Comply with ITU-T V.8, V.25/V.25bis
Answer Tone : 2100
±
15Hz
•
Calling Tone : Comply with ITU-T V.8, V.25
•
Receive Range : -12 ~ -44 dBm, -2 ~ -35 dBm
•
Dynamic Range : 0 ~ -44 dBm
•
Equalization : Automatic Adaptive Equalizer
•
Frequency Shift : Compensation cancel at least of
±
7Hz offset
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