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Cisco VG350 Voice Gateway Hardware Installation Guide
OL-25970-01
Chapter 2 Cisco Double-Wide High Density Analog Service Modules
FXO Fail-Over Bypass Ports
FXO Fail-Over Bypass Ports
Bypass/Failover Port, also called Fail-over Trunk Bypass, provides a way to use designated analog phone
ports to make phone calls through the Public Switch Telephone Network (PSTN) during power-outage
or power savings circumstances.
Table 2-2 shows the RJ-11 connector assignment.
Table 2-2 RJ-11 Connector Assignment
Faceplate
Label IN (RJ-11) OUT (RJ-11) Power ON Power OFF
FXO
BYPASS-0
To PSTN To external
FXO Interface
(optional)
PSTN to external FXO
Interface
FXS Port 46 to RJ-21
connector
PSTN to RJ-21
connector Port 46
No connection to
external FXO I/F
FXO
BYPASS-1
To PSTN To external
FXO Interface
(optional)
PSTN to external FXO
Interface
FXS Port 47 to RJ-21
connector
PSTN to RJ-21
connector Port 47
No connection to
external FXO I/F