ZyXEL Elite 2864 User Guide - Page 174

The modem supports laser printers compatible with HP Laserjet-II printers or laser printers supporting the HP PCLII programming command language. This includes essentially all HP-compatible laser printers on the market. Different laser printers may have different print speeds. The fax receiving speed depends on the fax connection speed. For current standards, the connection speed is from 2400 bps up to 14400 bps. For the upcoming V.34 fax standard, the speed may run up to 28800 bps. The printer speed must be greater than or equal to the fax receiving speed, otherwise a fax data overrun will occur. If the printer is slow, the modem may adjust the minimum scan time per line parameter to have the remote site send the fax slower (with a higher "minimum scan time per line" parameter). When a laser printer is connected to the modem and both are turned on, the command AT+FZT will cause the modem to test the printer speed and store the speed parameter in nonvolatile memory. The printer will have one test page print. The modem also sets the st (scan time) parameter in the +FCC Class 2.0 command according to the speed parameter. In the first Class Z mode operation after being turned on, the modem sets a default st parameter according to the speed parameter stored in the nonvolatile memory. The user can override the st setting by using the +FCC command. Two laser printer resolutions can be selected using +FZR command +FZR =0 Resolution: 300 dpi +FZR =1 Resolution: 150 dpi The default is 300 dpi. 150 dpi is not recommended because of printing quality degradation. If you are using a very slow laser printer, 150 dpi will speed up the fax receiving process. Use the AT+FZS command to select the paper size: +FZS =0 LETTER (8.5" x 11") =1 LEGAL (8.5" x 14") =2 A4 (210mm x 297mm) 15-20