ZyXEL zyxel Prestige100 User Manual download pdf (Page 67)

Remote Node Configuration 55

Bandwidth on Demand

The Bandwidth on Demand (BOD) feature allows you to bundle

both B channels in one logical connection. The second channel is

added and subtracted dynamically according to traffic demand.

The Prestige uses the Bandwidth Allocation Control Protocol

(BACP) and the Multilink Protocol (MP) in implementing

bandwidth on demand.

The configuration of bandwidth on demand focuses on the Base

Transmission Rate (BTR) and the Max. Transmission Rate (MTR).

The relationship between BTR and MTR are shown below:

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 60 kbps and

subtract threshold is 30 kbps. The Prestige will perform 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

calculated to determine if a link should be added or dropped.

‘Transmit’ will only use outgoing traffic to make this

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ZyXEL zyxel Prestige100 User Manual Page 67