ZyXEL Communications 480 - Manual (Page 65)

Prestige 480 ISDN Router
Remote Node Configuration 4-7
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
BTR = 256, MTR = 256 4 4 On
The Min. Channels and Max. Channels allows you to force the Prestige to use a minimum and
maximum number of channels.
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 for second channel 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.
When the Max. Channels is set to 3 or 4 and the threshold set in the Target Utility is reached for
the second channel a third and fourth channel is opened. The Bandwidth increment for
Additional Channels
specifies the line utilization range at which you want the Prestige to add or
subtract the third and fourth channel.
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 values 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.
After making the call to bring up a second channel, if 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.
You can do the BOD configuration using Menu 11.2 - Remote Node PPP Options.