Hardware Installation Manual 46 Document #: LTRT-10229
Mediant 800 MSBR
6.5.2 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.
Notes:
• FXO interface is a customer-ordered item.
• FXO is the interface replacing the analog telephone and connects to a Public
Switched Telephone Network (PSTN) line from the Central Office (CO) or to a Private
Branch Exchange (PBX). The FXO is designed to receive line voltage and ringing
current, supplied from the CO or the PBX (similar to an analog telephone). An FXO
VoIP device interfaces between the CO/PBX line and the Internet.
Cable specification:
Connector: RJ-11
Connector Pinouts:
Figure 6-14: RJ-11 Connector Pinouts for FXO Interface
To connect the FXO interfaces:
1. Connect one end of an RJ-11 cable to the FXO port (labeled FXO).
Figure 6-15: Connecting FXO Interfaces
2. Connect the other end of the cable to the required telephone interface: (e.g., telephone
exchange analog lines or PBX extensions).
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