
The transmission of the information on the Internet is done digitally instead of analog. Therefore,
there are different constraints on the fax transmission that may require different fax settings than the
analog Public Switched Telephone Network (PSTN). Fax is very dependent upon timing and signal
quality, so a fax transmission is more sensitive to a VoIP environment.
The following are suggested changes in settings for the HP LaserJet Analog Fax Accessory 500 when it is
connected to a VoIP service:
●
Start off with the fax set in V.34 (Fast) mode and with Error Correction Mode (ECM) turned on.
The V.34 protocol handles any changes in transmission speed needed to accommodate VoIP
networks.
●
If numerous errors or retries occur with the unit set to V.34, set V.34 Off and set speed to
Medium (14,400 bps).
●
If errors and retries persist, set a lower fax speed as some VoIP systems cannot handle the
higher signal rates associated with fax. Set the Maximum Baud Rate to 9,600 bps (Slow).
●
In rare cases, if errors persist, turn off ECM on the product. The image quality might decrease.
Ensure that the image quality is acceptable with ECM off before using this setting. If having the
ECM turned off eliminates errors, set the speed to 14,400 bps to get a faster transmission
speed, and potentially better error rate.
●
If the preceding setting changes have not improved the VoIP fax reliability, contact your VoIP
provider for help.
ENWW
Use fax 115
Summary of Contents for CC487-91209
Page 1: ...ANALOG FAX ACCESSORY 500 Fax Guide ...
Page 2: ......
Page 3: ...HP LaserJet Analog Fax Accessory 500 Fax Guide ...
Page 12: ...x ENWW ...
Page 68: ...56 Chapter 2 HP Color LaserJet CM3530 MFP Series ENWW ...
Page 141: ...A Service and support Hewlett Packard limited warranty statement Customer support ENWW 129 ...
Page 144: ...132 Appendix A Service and support ENWW ...
Page 148: ...136 Appendix B Specifications ENWW ...
Page 159: ...EMI statement Taiwan VCCI statement Japan EMC statement China ENWW EMI statement Taiwan 147 ...
Page 160: ...EMC statement Korea 148 Appendix C Regulatory information ENWW ...
Page 161: ...Substances Table China ENWW Substances Table China 149 ...
Page 162: ...150 Appendix C Regulatory information ENWW ...
Page 166: ......
Page 167: ......
Page 168: ... 2013 Hewlett Packard Development Company L P www hp com ...