About Thi Guide; Regulatory Information; Documentation Comments - 3Com VCX V7111 User Manual

Regulatory Information

FXO stands for Foreign Exchange Office, this interface replacing the analog
telephone and connecting to a PSTN line from the Central Office (CO) or to a PBX.
As such, 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 stands for Foreign Exchange Station, this interface replacing the Exchange
(i.e., the CO or the PBX) and connecting to analog telephones, dial-up modems,
and fax machines. As such, 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.
Caution: Ensure that you connect FXS ports to analog telephone or PBX-trunk
lines only, and FXO ports to CO/PBX lines only.
Where "network" appears in this manual, it means LAN, WAN, etc., accessed via
the gateway's Ethernet interface.

Documentation Comments

Your suggestions are important to us because we want to make our documentation more
useful to you.
Please send e-mail comments about this guide or any of the VCX 7111 documentation:
VOICE_TECHCOMM_COMMENTS@3com.com
Please include the following information with your comments:
Document title
Document part number (usually found on the front page)
Page number
Your name and organization (optional)
Example:
3Com VCX V7111 VoIP SIP Gateways User Manual
Part Number 900-0261-01
Page 25
3Com VCX V7111 VoIP SIP Gateway User Manual 11