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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

time

weight

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Ascend Pipeline Guide de l'utilisateur Page 36