ZyXEL Communications 56K Plus Series Manuel D’Utilisation
Omni 56K Plus Series User’s Guide
2-10 Specifications and Function Description
Before the security type or level can be changed, the modem
requires the supervisor password.
For type2 security, the remote site will be prompted to enter the user password. A maximum of 3 tries
in 40 seconds is allowed. If a correct password is not entered within this time limit, the line will be
disconnected. If the remote site is to enter the call-back number, it will be prompted to do so.
in 40 seconds is allowed. If a correct password is not entered within this time limit, the line will be
disconnected. If the remote site is to enter the call-back number, it will be prompted to do so.
2.6 Fax
function
2.6.1 Fax Physical Layer Protocol
Table 2-6 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
2.6.2 EIA Class 1/Class 2/Class 2.0 Command Set
Please refer to Fax Command Set in Chapter 4.
2.6.3 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.
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 a fax machine which
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.
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.
2.7 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
on line for a message announcement.
computer stores and forwards. It also means that the modem can playback the recorded digitized voice
on line for a message announcement.
2.7.1 Voice IS-101 Command Set
Please refer to the Voice command sets in Chapter 4.
2.7.2 4-bit Voice Data Compression
The main issue in the digitized voice mode is the amount of storage required. A relatively simple
ADPCM algorithm can reduce the speech data rate to half the rate and maintain about the same voice
ADPCM algorithm can reduce the speech data rate to half the rate and maintain about the same voice