3Com VCX v7111 User Manual page 16

V7111 refers to the V7111 24 PORT, V7111 18 PORT, V7111 14 PORT and V7111
12 PORT VoIP gateways.
V7111 1x PORT refers to the V7111 18 PORT, V7111 14 PORT and V7111 12
PORT VoIP gateways.
Where network appears in this manual, it means Local Area Network (LAN), Wide
Area Network (WAN), and the like accessed using the gateways Ethernet interface.
FXO (Foreign Exchange Office) 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 (just like an analog
telephone). An FXO VoIP gateway interfaces between the CO/PBX line and the
Internet.
FXS (Foreign Exchange Station) is the interface replacing the Exchange (that is, 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 gateway interfaces between the analog telephone
devices and the Internet.
WARNING:
Ensure that you connect FXS ports to analog telephone or to PBX-trunk lines only
and FXO ports to CO/PBX lines only.
The V7111 is supplied as a sealed unit and must only be serviced by qualified
service personnel.
Disconnect the V7111 from the mains and from the Telephone Network Voltage
(TNV) before servicing.
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3Com VCX V7111 VoIP Gateway User Guide