Specifications

AT-VP504E FXS 53
6
System Failure Bypass
Connector Configuration
The AT-VP504E FXS has a fifth RJ-11 connector used to connect to a
standard SCN line, called
Bypass . In the event of a commercial power
failure or network failure, this feature permits users to make and
receive calls even when the AT-VP504E FXS is not operating.
System Failure
Bypass Connector
Settings
During normal operation, the SCN line connected to the Bypass port is
switched out of the circuit through commuting relays. When power is
removed from the AT-VP504E FXS, the relay setting is restored to a
connected state and the SCN line can be used as an emergency line.
Consequently, a phone/fax used on FXS Port 1 will be directly
connected to this SCN line.
When the error conditions have been cleared or the power is restored,
Port 1 stays in System Failure Bypass connection until the device
connected to it is on-hook. This safety feature ensures that an
emergency call does not get disconnected from the SCN.
Setting the
Bypass Service
The following parameters can be set:
Table 22: Bypass Connector Settings
Variable Description
apaByPassModeAlways
Enable
variable set to 1
Always activate System Failure Bypass
service. The System Failure Bypass is
unconditionally activated.
apaByPassModeLanFail
Enable
variable set to 1
Activate System Failure Bypass service
when Ethernet connection is lost. The
System Failure Bypass is activated when:
• Network is down.
• Network connection is recovered
but a System Failure Bypass call
is still in progress.
apaByPassModeServer
FailEnable
set to 1
Activate System Failure Bypass service
when:
• The server is down.
• The server is back on-line but a
System Failure Bypass call is still
in progress.