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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 setup menu 2, 4, or 11.1 is saved.
The DI-300 and DI-300M 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
triggered after the send counter reaches 4. If the Idle Timeout
control is set to zero, the PPP echo mechanism will not be used.
Multiple Networking Protocol Support
The DI-300M is a multi-protocol router. It supports TCP/IP,
Novell IPX, and Transparent Bridging.
Introduction
3
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