Installation Manual 22 Document #: LTRT-85605
Mediant 600
Notes:
• Damage can be caused to external equipment if PSTN Fallback is
activated on two ports that are configured as user side.
• Ensure that paired BRI ports (i.e., ports I and II, and ports III and IIII) are
not identically configured (i.e., both user or both net side); otherwise,
PSTN Fallback does not function.
2.4.7 Connecting to FXS/FXO Interfaces
The procedure below describes the cabling of the device's FXS and FXO module analog
interfaces.
Warnings:
• To protect against electrical shock and fire, use a 26 AWG min wire to
connect FXO ports to the PSTN.
• Ensure that FXS and FXO ports are connected to the appropriate,
external devices; otherwise, damage to the device can occur.
¾ To connect the FXS /FXO interfaces:
Using the device's RJ-11 connectors on the FXS/FXO module, connect the device to
the required telephone interfaces:
• FXS: connect the FXS module's ports to fax machines, modems, and/or
telephones.
• FXO: connect the FXO module's ports to telephone exchange analog lines or
PBX extensions.
The RJ-11 connector pinouts are shown in the figure below:
Figure 2-11: RJ-11 Connector Pinouts
2.4.8 Connecting to Analog Lifeline Phone
The device's FXS modules provide a Lifeline phone connection on Port I. The Lifeline
provides a wired analog POTS phone connection to any PSTN or PBX, which provides
PSTN connectivity upon a power outage or when the network connection fails. For each
FXS module installed in the device, you can configure one Lifeline phone connection (using
Port I).
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