The main areas of the ACK/NACK data type entry window are:
User Pattern Editor that is activated when USER is selected. There are three ways to configure the ACK/NACK/DTX response from the pattern editor:
using the pattern selection table
loading (import) a file
using the Fill Pattern fields
The graph at the bottom of the window where colors designate the response type.
This selection assigns a NACK response for all subframes and turns the graph bar yellow.
This selection assigns an ACK response for all subframes and turns the graph bar green.
This selection enables the USER Pattern Editor where you configure a customized response.
The User Pattern Editor is active after the USER button is selected (green in color).
To eliminate the possibility of an unexpected response for some subframes when configuring a response pattern, start with all subframes set to ACK. For large patterns, it is easiest to set all subframes using the Fill Pattern parameters.
The pattern selection table shows the current ACK or NACK response, or DTX for each subframe as configured within the editor. The table lets you configure the responses or modify a previous response pattern. Selecting an empty check box within a row, makes that the current response type for the associated subframe number. The graph at the bottom of the window updates as table selections are made.
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This column shows the subframe numbers (0–79) and cannot be edited. |
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ACK |
This column shows the subframes that will transmit the acknowledgement response, which is indicated by a check mark in the box associated with the subframe number. Configuring a subframe for an ACK is done by selecting the empty check box. |
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NACK |
This column shows the subframes that will transmit the negative acknowledgement response, which is indicated by a check mark in the box associated with the subframe number. Configuring a subframe for a NACK is done by selecting the empty check box. |
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DTX |
This column shows the subframes that will not transmit any ACK or NACK response, which is indicated by a check mark in the box associated with the subframe number. Configuring a subframe for DTX is done by selecting the empty check box. |
This button loads a user-defined pattern (text file) from a selected location. When this button is selected, an Open ACK/NACK Pattern File window is displayed for navigating to and selecting the desired file. An imported file automatically updates the pattern selection table and the graph.
This button saves the current ACK/NACK/DTX pattern, shown in the pattern selection table, to a text file. When this button is selected, a Save ACK/NACK Pattern data window is displayed for navigating to the location where you can save the file.
This field sets the length of the user data. Values may range from 1 to 80.
This button resets each subframe with the ACK response, and updates the pattern selection table and the graph. A check mark appears in the ACK column for each subframe. The ACK ALL button performs a similar function, except it does not affect the pattern selection table.
The Fill Pattern area is part of the USER Pattern Editor, which is active with only the USER response type selection. It provides a quick method of creating a repeating response that builds upon the existing pattern shown in the pattern selection table. The Fill Pattern area reverts to default values, as shown in the figure, when the Data Type Entry window is closed. However, the values previously set remain in the pattern selection table. Once completed, you can save (export) the response pattern to a file.
This drop-down menu lets you select the response type (ACK, NACK, or DTX) for setting up the customized pattern. ACK is the default selection, which is also the default pattern for the pattern selection table.
This defines the starting subframe (0–79) for the selected response type.
This defines the length of the pattern, in subframes, before it repeats.
This defines the number of consecutive subframes within an interval that will transmit the selected response type.
This button applies the Fill Pattern fields to the pattern selection table and updates the graph.