User`s guide

Configuring WAN Connections
Connection profiles
Pipeline User’s Guide Preliminary January 30, 1998 1-17
parameters are set in Ethernet > Answer
>
PPP Options, and Ethernet >
Connections > any profile > Encaps Options.)
When the level of activity on the line is sampled, the weight assigned to the
currently required bandwidth depends on how much of the specified time period
has elapsed and which weighting algorithm was selected. As shown in Figure 5-
1, the weight can grow at a linear or quadratic rate or remain constant. The three
Dyn Alg settings—Linear, Quadratic, and Constant—affect the ALU calculations
as follows:
• Linear gives more weight to recent samples of bandwidth usage than to older
samples taken during the period specified by the Sec History parameter. The
weight grows at a linear rate.
• Quadratic (the default for MP+ calls) gives more weight to recent samples of
bandwidth usage than to older samples taken during the period specified by
the Sec History parameter. The weight grows at a quadratic rate.
• Constant gives equal weight to all samples taken during the time period.
Figure 1-1 illustrates the differences between the algorithms you can choose.
Figure 1-1. Bandwidth algorithms for MP+ calls
ALU is compared to a target percentage threshold, specified with the Target Util
parameter. When ALU exceeds the threshold for a specified length of time, the
Pipeline attempts to add channels. When ALU falls below the threshold for a
specified length of time, the Pipeline attempts to remove channels. You specify
the time periods for adding and removing channels with the Add Pers and Sub
Pers parameters, respectively. (These parameters are located in Ethernet >
Answer
>
PPP Options, and Ethernet > Connections > any profile > Encaps
Options.)
1800 sec.0
constant
linear
quadratic
0
time
1
weight