Compaq Armada M700 Series Reference Manual page 104

To connect the modem to an RJ-11 wall jack—
IMPORTANT:
at each end, may contain noise suppression circuitry 1. This
circuitry prevents interference with TV and radio reception.
Orient a cable with this circuitry as shown in the following
illustration.
1. Plug one end of the modem cable into the RJ-11 jack on the
computer 2.
2. Plug the opposite end of the cable into an RJ-11 wall jack 3.
7-2 Using an Internal Modem
The modem cable, which has a 6-pin RJ-11 connector