TRENDnet TW-H6W1IR - Manual (Page 112)

TW-H6W1IR ISDN Remote Router
104 Configuration and
Management
seconds, ISDN 2 will hang up and all traffic will be handled by ISDN
1.
For the above configuration to work, both ISDN ports need to have
been properly setup to establish dial-out PPP connections, and have
Multi-Link enabled. Also note that ISDN 1, being the B-channel that
initiated the call in the MLPPP bundle and thus the primary link, is not
subject to the BOD Low Threshold parameter and will never hang up
due to BOD considerations. The primary link can, however, be subject
to Dial on Demand (DOD) settings, and could thus disconnect if Dial
on Demand is enabled and the Idle Time parameter is met. Dial on
Demand settings are located in the Advanced Functions, Dial
Configuration submenu.
ISDN Link 1 and 2
Stac Compression – this is an industry standard 4:1compression
scheme. When enabled, the router will try to use Stac compression on
the designated ISDN port whenever possible. If the destination device