ADTRAN 1200103L2, Руководство пользователя

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Chapter 3. Operation
6
FXO+ Dual Voice Option Module User Manual 61200.103L2-1
Mode
Mode sets the type of 2-wire to T1 signaling used.
Choices include:
FXO_LS (FXO loop-start)
This mode detects the presence of ringing voltage on a
2W analog line with battery. The status of this ringing
signal is passed on out the T-span. The FXO+ also
provides loop-closure in response to signaling being
received on the T-span. The FXO interface
looks
like a
telephone to the analog line that it terminates. Line-
current dropout is also detected at the end of a call
(disconnect supervision) and is passed to the far-end
FXS card.
FXO_GS (FXO ground-start)
This mode is used when interfacing to or extending
ground start analog central office trunks. Ringing
voltage and tip-ground is detected by this card and
passed out the T-span. Incoming signaling on the
T-span will determine if ring ground or loop closure is
asserted on the 2W interface. Ground start lines are
often used with PBX and key systems to reduce the
possibility of incoming and outgoing calls on a trunk.
FXO_LSMW (FXO loop-start message waiting; used
in ESF framing only)
This mode is the same as FXO_LS with the exception
that 150-volt message-waiting voltage is detected and
that information is passed out the T-span to the far-
end FXS+ card. Message waiting operation allows an
analog message-waiting telephone to be placed at a
remote location and connected through T-span.