Fax Speeds
Faxes are transmitted using one of several variations of an international standard. These standards are divided into four groups.
Groups 1 and 2
Groups 1 and 2 are based on 300-baud communication rates. They pertain to analog devices and do not include a modem. Group 1 transmits one page in six minutes. Group 2 transmits one page in three minutes.
Group 3
Group 3 is for digital equipment and can use the same modem for data and fax. Not all modems in this group are compatible. Group 3 is comprised of several subclasses as shown in the following table.
| CCIT Term | bps |
|---|---|
| V.21 Channel 2 | 300 |
| V.27 Turbo | 4800 |
| V.29 | 9600 |
| V.17 | 14,400 |
Group 4
Group 4 allows the highest resolution to date (400 by 400, up to 1200 dpi). These speeds are for use with digital telephone circuits, ISDN, or leased lines.