Table 6. Physical Layer Capacity - ZyXEL Communications Omni 56K User Manual

STANDARD BIT RATE
V.90 28000-56000
V.34 2400-33600
V.32bis 14400
V.32bis 12000
V.32bis 9600
V.32bis 7200
V.32bis 4800
V.32 9600
V.32 uncoded 9600
V.32 4800
V.23 1200/75
V.23 600/75
V.22bis 2400
V.22 (BELL 212) 1200
V.21 (BELL 103) 300
Flow Control
This feature refers to stopping and restarting the flow of data into and out of the modem's
transmission and receiving data buffers. Flow control is necessary so that a device does not
receive more data than it can handle. The Omni 56K USB provides two kinds of flow control
methods.
Hardware CTS/RTS Flow Control
This is a bi-directional flow control where CTS and RTS are simulated RS-232C signals that
must be available on your computer. When the modem's transmission buffer is almost full, the
modem drops CTS to signal the DTE that it cannot accept data any more. Turn on the CTS to
notify the DTE that it can keep sending data to the modem. On the computer software side,
when the receiving buffer of the software is almost full, it drops RTS to signal the modem to
stop sending data to the DTE. Turn on the RTS and the modem starts sending data again to the
DTE.
Table 6. Physical Layer Capacity
BAUD RATE
[bps] [baud]
8000
multiple
2400
2400
2400
2400
2400
2400
2400
2400
1200/75
600/75
600
600
300
User's Guide for ZyXEL Omni 56K USB Modem
MODULATION CARRIER FREQUENCY
PCM 0
TCM multiple
128-TCM 1800
64-TCM 1800
1800
16-TCM 1800
1800
32-TCM 1800
16-QAM 1800
4-DPSK 1800
FSK
FSK
16-QAM 1200 Call
2400 Ans
4-DPSK 1200 Call
2400 Ans
FSK
[Hz]
3-5