Table 65 Btr Vs Mtr For Bod; Ppp Multilink; Bandwidth On Demand - ZyXEL Communications P-202H V2 User Manual

20.4 PPP Multilink

The ZyXEL Device uses the PPP Multilink Protocol (PPP/MP) to bundle multiple links in a
single connection to boost the effective throughput between two nodes.
Due to the fragmentation/reconstruction overhead associated with MP, you may not get a
linear increase in throughput when a link is added.
The number of links in an MP bundle can be statically configured, or dynamically determined
at runtime, as explained in the following section.

20.5 Bandwidth on Demand

The Bandwidth on Demand (BOD) feature adds or subtracts links dynamically according to
traffic demand. After the initial call, the ZyXEL Device uses BAP (Bandwidth Allocation
Protocol) to ask the peer for additional telephone number if BACP (Bandwidth Allocation
Control Protocol) is negotiated. Otherwise, the ZyXEL Device uses the statically configured
(primary and secondary) telephone numbers of the remote node.
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
in the following table:

Table 65 BTR vs MTR for BOD

BTR AND MTR SETTING
BTR = 64, MTR = 64
BTR = 64, MTR = 128
BTR = 128, MTR = 128
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 ZyXEL Device 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 ZyXEL Device 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.
Chapter 20 Remote Node Configuration
NO. OF CHANNEL(S) MAX NO. OF
USED CHANNEL(S) USED
1 1
1 2
2 2
P-202H Plus v2 User's Guide
BANDWIDTH ON
DEMAND
Off
On
Off
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