TRENDnet TW-H6W1IR - Manual (Page 108)

TW-H6W1IR ISDN Remote Router
100 Configuration and
Management
will be passed on to the Radius server. Remote networks (routers)
dialing into the router will still be authenticated using the remote
network profile.
PPP Configuration
Multi-Link PPP (MLPPP)
Multi-link PPP (MLPPP) is a standard (RFC 1990 and RFC 1717) for
inverse multiplexing, a method of combining individually dialed channels
into a single, higher speed data stream. MLPPP is an extension of PPP
that supports the ordering of data packets across multiple channels.
Although MLPPP can be implemented on any WAN device, it was the
rapid emergence of ISDN BRI as a cost efficient higher bandwidth
alternative to modems which has driven the evolution and acceptance of
MLPPP. Typically MLPPP is used to combine the speed of two ISDN
BRI B-Channels to get 128Kbps of virtual capacity.