ISDN

Call-By-Call Overview

Call-by-Call Min/Max Control

There are two variables that can be programmed for each trunk group to ensure optimum call utilization. These are the minimum and maximum values.

♦The minimum (min.) value is defined as the minimum number of B-channels in reserve that are necessary to ensure that a given trunk group can adequately service calls. The default value is zero.

♦The maximum (max.) value is the maximum number of B-channels that are necessary to ensure that a given trunk group can adequately service calls during a peak period. The default value is 23.

The min and max values must be determined by you based on the traffic volume and environment. Here are some guidelines:

♦The total number of lines assigned to all trunk groups as minimums should not exceed the number of B-channels in the channel group. For example, if there are 23 B-channels in the channel group, the total sum value programmed as minimum in all trunk groups should not exceed 23.

♦The maximum value typically never exceeds the total of the subscribed B-channels for the channel group. The programmed maximum value is typically used to limit the total number of shared lines available to a given trunk group.

Example 2

This example shows how to determine the maximum number available to a trunk group.

Refer to Figure 7-3. Add the min. values from the other trunk groups, then subtract that sum from the number of B channels in the channel group. The remainder is the total number of lines available for that trunk group. This is outlined in steps 1 and 2 below.

1.Determine the total number of lines available to Trunk Group 1.

3Trunk Group 2 Min.

+5 Trunk Group 3 Min.

8Min. Value for Trunk Groups 2 & 3

2.Subtract from other Trunk Groups’ min. values from the number of B-channels in that Channel Group.

Channel Group 1

Trunk Group 1

Max. = 23

Min. = 8

Trunk Group 2

23B-channels in Channel Group 1

-8 Min. Value for Trunk Groups 2 & 3

15Lines available to Trunk Group 1 (8 reserved + 7 shared)

Max. = 7 Min. = 3

Trunk Group 3

Max. = 12

Min. = 5

4917

Note Even through the max. value is set for 23 channels, only 15

channels are available forFigure 7-3 Example 2 – Shared Trunk Lines

Trunk Group 1.

Maximum trunk group values are set in Program *67-4. Minimum trunk group values (reserved) are set in Program *67-3.

7-12

Strata DK Programming 5/00

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Toshiba dk14, DK40I, DK424I manual Call-by-Call Min/Max Control, Channel Group
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