Tainet T-336Cx, Руководство пользователя, Страница: 13 / 109

Chapter 1 Tainet Modem Introduction
4
V.23
1200/75
FSK 1700/420 1200 N/A
V.21 0-300 FSK 1080/1750 300 N/A
BELL 212A 1200 DPSK 1200/2400 600 4
BELL 103 0-300 FSK 1175/2125 300 N/A
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 600
Ω ±
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