Ringdale ISDN Router ISDN User Manual page 26

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
TEI Unassigned
TEI Requested
TEI Assigned
Starting Datalink
Releasing Datalink
Datalink Active
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
Unknown
No Call [State 0]
Setup Sent [State 1]
Call Proceeding [state 3] Call is being established.
Alerting [State 4]
Call Received [State 8]
Call Active [State 10]
Starting
Authentication
Link Open
Link Down
Explanation
No IDENTITY assigned for ISDN network.
Router is asking for IDENTITY on ISDN network.
Router has IDENTITY on ISDN network.
Establishing datalink with phone switch.
Closing datalink with phone switch.
Datalink open with phone switch.
Explanation
No response from router or unknown state.
No call is currently active.
Call request sent.
Receiving status report from phone switch.
A call is being received.
Call is currently active.
Attempting to establish a call.
Attempting security authorization.
Communications link is ready for transmission.
Communications link is not active.
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