Ringdale ISDN user manual Channel State Explanation

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.

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