Channel Setup: IS95A Reverse

The Data Source Selection dialog box allows you to select from Random, PN9, or User Defined Bits.

To select from the following data types, click the desired radio selection:

Random

Provides random signal generator data. If this is the selection, you are returned to the Channel Setup pane.

PN9

Provides a pseudo-random bit sequence containing 511 bits (2⁹-1). When there are not enough bits left in the PN sequence to fill a frame, the software repeats the data sequence. When the maximum length is reached, it truncates any remaining data. If this is the selection, you are returned to the Channel Setup pane.

User Defined Bits

Opens the user data entry area, which lets you customize the transmitted data.

The user data entry area contains buttons to import, export, or clear user data along with the ability to insert PN9 data. Optionally you can manually insert or delete data. To manually insert data, simply place the cursor within the data entry area or highlight existing bits, and insert data. There are three ways to insert data: 

• using the 1 and 0 keys on the keyboard

• using the Insert PN9 button

• pasting data from a file or from within the current view

(The key board shortcuts Ctrl+C and Ctrl+V work for user data entry.)

To delete data, simply place the cursor at the desired location within the data or highlight bits, and delete the data. The key board shortcut Ctrl+Z also deletes highlighted data.

The maximum number of bits for the user data entry area is 65,536, which is also the maximum file size.

The expanded area has four buttons that can be used to manipulate data for the channel.

The four buttons in the expanded area are:

Import

Loads a user-defined pattern from a selected location. When you select this button, the Open user defined data dialog box appears for navigating to and selecting the desired file. An imported file automatically updates the user data entry area. The software accepts the following file types:

• ASCII text

• comma separated values (csv)

• binary

The maximum file size is 65,536 bits. If the imported file is larger than 65,536 bits, the software truncates the bits to conform to the maximum file size.

Export

Saves the current data pattern, showing in the user data entry area, to a file. When you select this button, a Save user defined data dialog box appears for navigating to the location where you can save the file. The software saves the user data as one of the following selected file types:

• ASCII text

• comma separated values (csv)

• binary

Clear

Clears all data showing in the user data entry area.

Insert PN9

Inserts a fixed pattern pseudo-random bit sequence containing 511 bits (2⁹-1) into the user data entry area. The software generates this fixed pattern in accordance with the CCITT recommendation O.153. Repeated clicking of this button adds additional PN9 sequences until the software attains the maximum file size of 65,536 bits. The software truncates data in excess of the maximum file size.

To edit the data pattern, insert the cursor at the desired point in the file and click Insert PN9, or enter the information manually using the keyboard keys 1 and 0. The software inserts the data at the cursor position and truncates all data in excess of 65,536 bits.