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Ringdale ISDN User Manual

Page 26

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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

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.