MediaPack Analog Gateways 41 MP-1288
Hardware Installation Manual 5. Cabling the Device
5.4 Connecting the FXS Analog Lifeline
The device supports PSTN Fallback (analog Lifeline), whereby it automatically connects an
FXS port (Lifeline extension or phone) to the PSTN / PBX upon a power outage. This
enables the phone to make and receive calls to and from the PSTN respectively, instead of
the IP network.
Each FXS blade supports up to three FXS Lifelines, one per FXS connector. For each
connector, the first channel provides the connection to the Lifeline extension and the last
channel is the Lifeline interface providing the connection to the PSTN / PBX. For example,
for FXS connector labeled FXS 1-24, channel 1 is the Lifeline extension and channel 25 is
the Lifeline interface for the PSTN / PBX.
The cable specifications for the FXS Lifeline include the following:
Cable: For optional cable types, see Section 5.3 on page 32.
Connector Type: 50-pin Telco
Figure 5-15: 50-pin Telco Connector for FXS Lifeline
Connector Pinouts:
Table 5-3: 50-pin Telco Connector Pinouts for FXS Lifeline
Telco Connector Pins Description
1/26 Connects to FXS Lifeline extension
25/50 Connects to PSTN / PBX (Lifeline interface)
For all the connector's pinouts, see Section 5.3 on page 32.
To cable FXS Lifeline per FXS connector:
1. See Section 5.3 on page 32 for connecting the 50-pin Telco connector to the FXS
blade and for connecting it to a distributional panel.
2. Once you have performed Step 1, connect the lifeline as follows:
• Connect Port #1 to the FXS extension (e.g., telephone).
• Connect Port #25 to the PSTN / PBX (Lifeline interface).
Figure 5-16: Cabling FXS Lifeline
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