HP LaserJet 3052 Service Manual - Page 114
Faxing with Voice over IP services, The fax subsystem, Formatter in the fax subsystem, Disable, Enable
View all HP LaserJet 3052 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 114 highlights
Faxing with Voice over IP services Voice over IP (VoIP) services provide normal telephone service, including long distance service through a broadband Internet connection. These services use packets to break up the voice signal on a telephone line and transmit it digitally to the receiver, where the packets are reassembled. The VoIP services are often not compatible with fax machines. The VoIP provider must state the service supports fax over IP services. Because the installation process varies, the VoIP service provider will have to assist in installing the allin-one fax component. Although a fax might work on a VoIP network, it can fail when the following events occur: ● Internet traffic becomes heavy and packets are lost. ● Latency (the time it takes for a packet to travel from its point of origin to its point of destination) becomes excessive. If you experience problems using the fax feature on a VoIP network, ensure that all of the all-in-one cables and settings are correct. Configuring the V.34 setting to Disable (Enable is the default setting) can also improve your ability to send a fax over a VoIP network. If you continue to have problems faxing, contact your VoIP provider. The fax subsystem The formatter, LIU, firmware, and software all contribute to the fax functionality. The designs of the formatter and LIU, along with parameters in the firmware, determine the majority of the regulatory requirements for telephony on the all-in-one. The fax subsystem is designed to support V.34 fax transmission, lower speeds (such as V.17 fax), and older fax machines. Formatter in the fax subsystem The formatter contains the modem chipset (DSP and CODEC) that controls the basic fax functions of tone generation and detection, along with channel control for the fax transmissions. The CODEC and its associated circuitry act to control transmit and receive gains, and to compensate for transmission signal coupling into the receive channel. The formatter also contains circuitry that adds termination impedance to help match the telephone network impedance. 94 Chapter 4 Theory of operation ENWW