Zhone Technologies IMACS-200 - Manual (Page 158)

6-10 FXS Ports
Model No. Running Head
noWAN There is no WAN port configured in the slot to which the FXS port is
assigned.
call Call set-up is in progress.
busy Call is in progress.
idle No call is in progress (port is available for a call).
TC The port is in Trunk Conditioning because a CGA alarm occurred on the
associated WAN port.
test A test is in progress on the port (i.e., you are actively controlling the circuit
by setting values for Tx ABCD or Rx ABCD).
maint The port is in a maintenance condition.