Bandwidth On Demand - NETGEAR RT338 Reference Manual

Bandwidth on Demand

The Bandwidth on Demand (BOD) feature lets you bundle both B channels in one logical
connection. The second channel is added and subtracted dynamically according to traffic demand.
The router uses the Multilink Protocol (MP) in implementing bandwidth on demand. An extension
to MP, the Bandwidth Allocation Control Protocol (BACP) may optionally be used.
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 is shown in
Table 7-3.
Table 7-3. Relationship Between BTR and MTR
BTR & MTR Setting
BTR = 64, MTR = 64
BTR = 64, MTR = 128
BTR = 128, MTR = 128
When the Bandwidth on Demand feature is enabled, a second channel is 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 is 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 router to add or
subtract bandwidth. The range is 30 to 64 Kbps. The parameters are separated by a hyphen ( - ).
For example, 30-60 means the add threshold is 60 Kbps and the subtract threshold is 30 Kbps.
The router 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,
traffic in either direction is calculated to determine if a link should be added or dropped.
Transmit uses only outgoing traffic to make this determination, and Receive uses only incoming
traffic to make this determination.
Remote Node Configuration
Reference Guide for the Model RT338 ISDN Router
Number of Channels
Used to Initiate Call
1
1
2
Max Number of Bandwidth
Channels Used on Demand
1 Off
2 On
2 Off
7-9