D-Link DI-1162 - Manual (Page 108)

DI-1162 Remote Access Router
98 Configuration and Management
RX) ever exceeds 80% of the 64kps (51.2kps), the router will sample
the line for an additional 5 seconds. If the traffic continuously exceeds
80% for the 5 second delay time, WAN 2 will dial up and add
bandwidth to the connection. Assuming sustained traffic of 70kps,
MLPPP will balance the traffic on the two WAN ports so they are
handling roughly 35kps each. If the traffic on WAN 1 + WAN 2 falls
below 20% of the 128kps connection (25.6kps) for more than 10
seconds, WAN 2 will hang up and all traffic will be handled by WAN
1.
For the above configuration to work, both WAN ports need to have
been properly setup to establish dial-out PPP connections, and have
Multi-Link enabled. Also note that WAN 1, being the lowest numbered
WAN port 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.
WAN 1 and WAN 2