ZyXEL Communications Prestige 128Plus, User Manual, Page: 80 / 203

Prestige 128+ ISDN Router
4-8 Remote Node Configuration
The configuration of bandwidth on demand focuses on the Base Transmission
Rate (BTR) and the Maximum Transmission Rate (MTR). The relationship
between BTR and MTR are shown below:
Table 4-2 BTR v MTR for BOD
BTR & MTR Setting No. of
channel(s) used Max No. of
channel(s)
used Bandwidth
on demand
BTR = 64, MTR = 64 1 1 Off
BTR = 64, MTR = 128 1 2 On
BTR = 128, MTR = 128 2 2 Off
When bandwidth on demand is enabled, a second channel will be brought up if
traffic on the initial channel is higher than the high
Target Utility number for
longer than the specified Add Persist value. Similarly, the second channel will
be dropped if the traffic level falls below the low Target Utility number for
longer than the Subtract Persist value.
The Target Utility specifies the line utilization range at which you want the
Prestige to add or subtract bandwidth. The range is 30 to 64 kbps (kilobits per
second). The parameters are separated by a ‘-’. For example, ‘30-60’ means the
add threshold is 30 kbps and subtract threshold is 60 kbps. The Prestige performs
bandwidth on demand only if it initiates the call. Addition and subtraction are
based on the value set in the
BOD Calculation field. If this field is set to
Transmit or Receive , then traffic in either direction will be included to
determine if a link should be added or dropped. Transmit will only use outgoing
traffic to make this determination and Receive will only use incoming traffic to
make this determination.
If, after making the call to bring up a second channel, the second channel does
not succeed in joining the Multilink Protocol bundle (because the remote device
does not recognize the second call as coming from the same device), the Prestige
will hang up the second call and continue with the first channel alone.
The BOD configuration is through Menu 11.2 - Remote Node PPP Options.