To connect the FXS interfaces:
1. Connect one end of an RJ-11 cable to the device's FXS port (labeled FXS), located on
the rear panel:
Figure 5-7: Connecting FXS Interfaces
2. Connect the other end of the cable to the required telephone interface (e.g., fax
machine, dial-up modem, or analog POTS telephone).
5.3.2 Connecting FXO Interfaces
The procedure below describes how to cable the device's FXO interfaces.
Warnings:
• The device does not include primary telecom protection! When the FXO telephone
lines are routed outside the building, additional protection - usually a 350V three-
electrode Gas Discharge Tube (GDT) as described in ITU-T K.44 - must be provided
at the entry point of the telecom wires into the building (usually on the main
distribution frame / MDF), in conjunction with proper grounding. The center pin of the
GDT (MDF grounding bar) must be connected to the equipotential grounding bus bar
of the Telecommunication room.
• To protect against electrical shock and fire, use a minimum 26-AWG wire to connect
FXO ports to the PSTN.
• Ensure that the FXO ports are connected to the appropriate, external devices;
otherwise, damage to the device may occur.
• FXO ports are considered TNV-3.
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