ZyXEL Communications Omni 56K II - Manual (Page 40)

Omni 56K II and Omni 56K Plus II User’s Guide
3-12 Specifications and Functions
3.17 Fax function
3.17.1 Fax Physical Layer Protocol
Table 3-7 Fax Physical Layer Capacity
STANDARD BIT RATE [BPS] BAUD RATE
[BAUD]
MODULATION CARRIER
FREQUENCY [HZ]
V.17 14400-7200 2400 TCM 1800
V.29 9600-4800 2400 QAM/DPSK 1700
V.27ter 4800-2400 1600/1200 PSK/DPSK 1800
V.21 300 300 FSK
3.17.2 EIA Class 1/Class 2 & Class 2.0 Command Sets
Please refer to Section 5.2 Fax Command Sets.
3.17.3 ITU-T T.30 Fax Protocol
The ITU-T T.30 fax protocol is known as the G3 fax handshake signals and procedures. The modem takes
full control of this protocol - initiating and terminating fax calls, managing the communication session, and
transporting the image data. Therefore, the modem relieves the computer fax software of the T.30 protocol
handling.
You modem allows for fax speeds up to 14400 bps when transmitting to another fax machine that complies
with the V.17 fax standard. Speeds will fall back to 12000, 9600, or 7200 bps in poor line conditions. When
connecting to a G3 fax device, your modem allows for fax speeds up to 9600 bps and will automatically fall
back to 7200, 4800, and 2400 bps if the line quality is poor.
3.18 Voice Function
Voice capability stands for the modem's ability to digitize incoming voice messages, which the computer
stores and forwards. It also means that the modem can playback the recorded digitized voice online for a
message announcement.
3.18.1 Voice IS-101 Command Set
Please refer to the voice command sets Chapter 5.