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New Visitor
Posts: 1
Registered: ‎08-31-2007

Fax Machine Connection

How do I connect my fax machine off my Comcast modem. I bought a DSL filter, need to know the correct wiring set-up.
Bronze Star Contributor
Posts: 128
Registered: ‎09-27-2006

Re: Fax Machine Connection

You are wrong... the FAX machine is designed to work only on the phone line not on cable... it wouldn't work on the cable anywhere...
 
You should use the phone line to hook FAX machine up...
 
higgie
 
Regular Problem Solver
Posts: 1,210
Registered: ‎04-07-2005

Re: Fax Machine Connection

Do you mean you have comcast digital voice?  If so you should be able to just plug right into the modem's phone jack (or any other phone jack that connects to it) without any filters.  DSL filters are only for DSL service.
 
Though I'm not positive if there are any issues with running fax via comcast's VOIP service.  I think it works fine.
Email Expert
Posts: 18,241
Registered: ‎04-27-2004

Re: Fax Machine Connection

Return the DSL filter, you don't need that with cable modems or VOIP service. As the name implies, it's only for DSL lines.

If you do actually have CDV, there's a sticky post Fax Troubleshooting for Comcast Digital Voice in the Comcast Digital Voice forum.
New Visitor
Posts: 2
Registered: ‎08-10-2009

Re: Fax Machine Connection

after searching for hours on the internet today I discovered a simple trick. Faxes only use the middle two pins(red and green)  of the newer 4 pins connectors. The outer two pins (yellow and black) create a host of problems including dropped faxes, communications errors and "phone off hook" messages. Disable the outer two and your fax will work like a charm plugged into the cable modem or using a splitter for the phone!