D-Link DI-308 - Manual (Page 39)

DI-308 ISDN Remote Router
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Remote Access Configuration
The Remote Access Configuration menu is used to set up the router for dial-in and
dial-out connections over the ISDN line. An ISDN line has a D channel for
establishing connections and two B (Bearer) channels, which transmit and receive
the actual signals, whether voice or data. The two B channels can support two
independent remote connections or be banded together using Multi-link PPP to
implement Bandwidth on Demand (configured separately in the Multi-Link PPP
Configuration menu, the last item in the Advanced Functions window).
The B-Channels can also carry voice and fax calls, which are routed to the telephone
jacks located on the rear of the router. Please note, however, that the DI-308 can
maintain only two connections at a time via the two B channels, whether the
connections are voice, data, dial-in users, remote networks or a combination thereof.