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CONFIGURING YOUR ROUTER
ISDN D-Channel represents a special channel normally used by
the router to transmit or receive signals for managing data transfers
over the ISDN line.
D-channel State Explanation
TEI Unassigned No IDENTITY assigned for ISDN network.
TEI Requested Router is asking for IDENTITY on ISDN network.
TEI Assigned Router has IDENTITY on ISDN network.
Starting Datalink Establishing datalink with phone switch.
Releasing Datalink Closing datalink with phone switch.
Datalink Active Datalink open with phone switch.
For routers using an ETSI or German switch type, the normal idle
state is when the D-channel state indicates TEI Assigned. For
routers using the National ISDN 1 switch type, the normal idle
state is when the D-channel indicates Datalink Active. When the
router is in the normal idle state for its switch type, this means that
it is in communication with the ISDN phone switch and is ready to
make calls.
ISDN B1 Channel and ISDN B2 Channel represent the physical
ISDN lines and the Point to Point Protocol. When a B-Channel is
active, then the ISDN line for that B-Channel is currently in use.
For data transfer to be possible on a B-channel, the channel status
must be active.
B-channel State Explanation
Unknown No response from router or unknown state.
No Call [State 0] No call is currently active.
Setup Sent [State 1] Call request sent.
Call Proceeding [state 3] Call is being established.
Alerting [State 4] Receiving status report from phone switch.
Call Received [State 8] A call is being received.
Call Active [State 10] Call is currently active.
Starting Attempting to establish a call.
Authentication Attempting security authorization.
Link Open Communications link is ready for transmission.
Link Down Communications link is not active.