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ISDN Basic Rate Interface (BRI)
Using a standard S/T or U Interface (the DI-106 and DI-106M use
the S/T interface, while the DI-106W and DI-106MW use the U
interface) the DI-106 and DI-106M support a full range of switch
types. The switch type depends on the CO (Central Office) switch
your ISDN line is connected to. See the ISDN Switch Types chapter
for more information on North American, European, and Asian
ISDN firmware and switch types supported by these routers.
The two B-channels can be used independently for two
destinations. Or they can be bundled for one connection to support
bandwidth-on-demand.
ISDN Leased Line
If the router is set up for an ISDN leased line (that is, if any option
but Switch/Switch or Switch/Unused is selected for the B Channel
Usage control in setup menu 2, ISDN Setup, and the Transfer Type
control is set to Leased in either setup menu 4, Internet Access
Setup, or setup menu 11.1, Remote Node Profile), the router will
automatically initialize the leased-line connection each time it is
powered up or the settings in setup menu 2, 4, or 11.1 are saved.
The DI-106 and DI-106M implement the PPP echo mechanism for
verifying ISDN leased line status. The setting of the Idle Timeout
control in setup menu 11.1 will be used as the interval between two
LCP_Echo_Req messages. It is supposed that there exists an echo
reply corresponding to an echo request. Whenever an echo request
is sent, the counter will be incremented by one.
The send counter will be reset to zero after an echo response is
received. The leased-line error recovery mechanism will be
Introduction
3
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