2.4.2 Connecting MP-11x to FXS Interfaces
The procedure below describes how to cable the MP-11x FXS interfaces.
Warnings:
• Ensure that you connect FXS ports only to analog telephones; otherwise,
damage to MP-11x may occur.
• FXS ports are considered TNV-3
Note: FXS (Foreign Exchange Station) is the interface replacing the Exchange (i.e.,
the CO or the PBX) and connects to analog telephones, dial-up modems, and
fax machines. The FXS is designed to supply line voltage and ringing current
to these telephone devices. An FXS VoIP device interfaces between the
analog telephone devices and the Internet.
This cabling requires a two-wire telephone cord with the following RJ-11 connector pinouts:
Figure 2-8: RJ-11 Connector Pinouts for FXS Interface
To connect MP-11x to FXS interfaces:
1. Connect one end of an RJ-11 two-wire telephone cord to the desired FXS port (labeled
FXS).
Figure 2-9: Connecting FXS Interfaces
2. Connect the other end of the cord to the required telephone interface (e.g., fax
machine, dial-up modem, or analog POTS telephone).
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