Draytek 2910 - Manual (Page 156)

Vigor2910 Series User’s Guide 150
PPP Authentication It specifies the PPP authentication method for PPP/MP
connections. Normally you can set it to PAP/CHAP for better
compatibility.
TCP Header Compression VJ Compression - It is used for TCP/IP protocol header
compression. Normally it is set to None to improve bandwidth
utilization.
Idle Timeout Because our ISDN link type is “Dial On Demand”, the
connection will be initiated only when needed.
High Water Mark and
High Water Time BOD stands for bandwidth-on-demand for Multiple-Link
PPP (ML-PPP or MP). High Water Mark/ High Water
Time/ Low Water Mark/Low Water Time parameters are
applied when you set the Link Type to Dialup BOD. The
ISDN usually uses one B channel to access the Internet or
remote network when you choose the Dialup BOD link type.
The router will use the parameters here to decide on when
you activate/drop the additional B channel. Note that cps
(characters-per-second) measures the total link utilization.
These parameters specify the situation in which the second
channel will be activated. With the first connected channel, if
its utilization exceeds the High Water Mark and such a
channel is being used over the High Water Time, the
additional channel will be activated. Thus, the total link
speed will be 128kbps (two B channels).
Low Water Mark and Low
Water Time These parameters specify the situation in which the second
channel will be dropped. In terms of the two B channels, if
their utilization is under the Low Water Mark and these two
channels are being used over the High Water Time, the
additional channel will be dropped. As a result, the total link
speed will be 64kbps (one B channel).
Note: If you are not sure whether your ISP can support BOD and/or ML-PPP’s
features, please seek assistance from your ISP, local dealers or our website:
[email protected].