D-Link DI-206 - Manual (Page 58)

DI-206 ISDN Remote Router
46 Configuration and
Management
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-206 can maintain only two connections at a time