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Chapter 3. Operation
Port Configuration Menu Items and Their Choices
18
Mode
Mode sets the type of 2-wire to T1 signaling and super-
vision to be used. Choices include:
• FXS_LS
This mode sets the port to use FXS loop-start type
signaling on the T-Span and loop-start supervision on
the analog 2-wire interface. This mode supports far-
end disconnect by removing tip-ground during the call
if signaled to do so over the T-span. When used with
an ADTRAN FXO+, this feature allows line-current
drop-outs to be passed on to equipment connected to
the FXS+ 2-wire port. Ringing cadence will follow that
provided over the T-span or detected by the FXO port
at the far-end.
• FXS_LSMW
This mode operates as FXS-LS but with the additional
feature of being able to illuminate the message-waiting
light on a message-waiting telephone if used in
conjunction with an ADTRAN FXO+ on the far end.
This feature requires the T-span to be operated on ESF
framing. When any port uses this mode in a slot,
ringing is scheduled to a common two second on, four
second off cadence, for all ports in that slot.
• FXS_GS
This mode set the port to use FXS ground start on the
T-span and ground-start supervision on the analog
2-wire interface. Ground start operation is often used
with trunk interfaces to PBX and key systems to
prevent glare conditions. Ringing cadence will follow
that provided over the T-span or detected by the FXO
port at the far-end.
• TANDEM_LS
This mode sets the port to use E&M signaling on the
T-Span and loop-start supervision on the analog
2-wire interface. When using this mode, line-current
drop-out for 500 ms is provided when a call termi-
nates and the far-end hangs up. This may be useful
for voice-mail or modem systems that need far-end
FXS+ Dual Voice Option Module
61200.080L1-1
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