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Please be sure that you have the fax line in the correct jack on the back. Some of the HP modems will actually send a fax if you plug the telephone cord from the wall into jack that is supposed to have a telephonep plugged into it. On the back of the 1522 there are two phone jacks, the upper one is where the cord from the wall plugs in. Also ensure that if you have DSL service that you have a filter in the line for the modem.
Make sure you have a DSL Filter installed on the phone line to prevent DSL signals from interfering with the operation of the fax machine. A DSL filter looks like a line splitter or Y-Adapter and you should have received one or more of them with your DSL modem.
I recommend you check to make sure you have the most current drivers for your PC modem and that you also download the User Guide for your printer for the guidance on using your printer to send and receive faxes.
You need to setup your system to use the modem in your PC.
Assuming "cable modem" as some kind of DSL modem using your phone line for internet. Both your modem and MFU should be connected to the wall by a filter-separator, usually supplied with your DSL modem. Check its presens and proper connection. Remove any other joints or splitters
Typically, a fax machine is connected directly to a telephone wall jack with a known working connection. Try plugging the fax machine directly into a wall jack first and pick up the handset on the fax machine if it has one. You should get a dial tone. Then try to fax something to someone you know.
The machine can also usually be routed through the modem in a computer by connecting the "line" cord on the modem to the wall jack and plugging the fax machine into the the "phone" jack on the modem. You may need to install the software that came with the fax machine to get this to work.
If you have no dial tone, check the wall jack with a known to be working single line phone. If there is a dial tone, it's something to do with fax machine, the computer modem or the connections.
Some fax machines can take advantage of internet faxing through a cable modem or DSL connection. Check your manual for the options available.
Each phone or dial-up modem or fax machine needs a DSL filter attached to the phone line/socket then each phone or dial-up or fax machine is then plugged into this filter.
The DSL modem does not require a filter.
If your fax is part of the computer's modem then a filter is also required on the line-in on the modem.
The instructions for sending & receiving depends upon your system/dial-up modem (the make & model, is it stand alone or a modem adapter on the expansion slot or built-in on the motherboard) and the software you are using. Cannot help you without these details.
Make sure that you are not running on a digital line, on a digital phone system, or using the same line as a DSL modem. This is essentially any phone that uses the same number, not just the jack in the wall. Newer modems use similar frequencies to DSL and digital phone systems even when you are running equipment to scrub the line so they are not compatible and will often interfere with one another.
Sending a fax by DSL requires one of two methods:
1. You obtain a DSL line filter suitable for connecting a standard voice telephone to the DSL line, then connect an analog fax modem to the line through the line filter.
2. You hire an Internet E-faxing service. See