Zhone IMA CS-200 System Reference Manual page 158

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.
6-10
Model No.
FXS Ports