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Data (Normal GMSK Burst Advanced)

The Normal GMSK Burst - Advanced is a coded channel that is available with Option QFP. To open the Data node, click Data in the tree view. The figure below shows the Data node. The cells displayed in the Data node are determined by the Channel Type, as defined in the Timeslot window, for the selected timeslot.

The timeslots shown below are set to show all of the available timeslot types, not to show a typical test configuration.

1. Data (Normal GMSK Burst)

Tail Bits 1 (3+3 bits)

Data

Stealing Flags (1+1 bits)(1 bit entry)

Training Sequence Bits (26 bits)

Guard Period (n bits)

2. Control Frame

Data for Control Frame

Change Data Values Button

Click to display a drop-down menu in which you can copy a timeslot configuration from one timeslot to another.

Data Node Parameters

Use the Data window to define the bits in the bursts. The cells displayed in the Data section are determined by the burst type (Timeslot Type) for the selected timeslot as defined in the Timeslots window. In the window shown above, Timeslots 0 thru 7 all are set up for a Normal GSM Burst (the GMSK modulation indicates that this is a GSM burst).

Normal GMSK Burst Bits

1. Data (Normal GMSK Burst)

Tail Bits 1 (3+3 bits)

Default: X"79CE"

Click the Details button in this cell to open the Data Source Selection. Enter 15 bits to use in the first of the two tail bit segments of the normal 32QAM burst. See Closeddrop-down figure. 

Import

Click Import to open a dialog box in which you can navigate to and import a pre-defined pattern file. The imported file automatically updates the user data entry area. The software accepts the following file types:

The maximum file size is 65536 bits. If the imported file is larger than 65536 bits, the software truncates the bits to conform to the maximum file size.

Export

Click Export to open a dialog box in which you can save the current data pattern to a file. You can save the data pattern as one of the following file types:

Clear

Click Clear to clear all data displayed in the user data entry area.

Insert PN9

Click Insert PN9 to insert a fixed psuedo-random bit sequence (pattern) containing 511 bits (29-1) into the user data entry area. The software generates this fixed pattern in accordance with the CCITT recommendation 0.153. You can click this button repeatedly to add additional PN9 sequences until the maximum file size is reached (65536 bits). If the maximum file size is exceeded, the software truncates the excess data. 

To edit the existing data pattern after reaching the maximum file size, insert the cursor at the desired point in the file and press Insert PN9 or use the keyboard 1 and 0 keys. The software inserts the data at the cursor position and truncates data in excess of 65536 bits.

Insert PN15

Click Insert PN15 to insert a fixed pattern psuedo-random bit sequence containing 32,767 bits (215-1) into the user data entry area. The software generates this fixed pattern in accordance with the CCITT recommendation O.153.

To edit the data pattern, insert the cursor at the desired point in the file and click Insert PN15, 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 65536 bits.

Data

Choice: PN9 |PN15 | User Defined Bits

Default: PN9

Click the Details button in this cell to open the “Data source selection” window.

Please select PN9, PN15 or User Defined Bits for encrypted bits.

Select User Defined Bits, to create a custom data string. (See User Defined Bits description)

Stealing Flags (1+1 bits)(1 bit entry)

You can enter 1 (control channel burst) or 0 (data channel burst). The default is 0.

Training Sequence Bits (26 bits)

Choice: TSC0 to TSC7 or User Defined Bits

Default: TSC0

Click the Details button in this cell to open the ClosedData Source Selection window.

Select TSC0 to TSC7 or User Defined Bits to use for the training sequence bits. If you have selected GSM All Timeslots Normal from the ClosedAdd New Carrier drop-down menu, or All GMSK Normal timeslots from the ClosedPre-defined Carrier Configuration dialog box, the default training sequence corresponds to the timeslot number. For example, the default for timeslot 0 is TSC0, the default for timeslot 1 is TSC1, and so on.

Add New Carrier            

GSM All Timeslots Normal

All timeslots are configured as Normal GMSK bursts.

EDGE All Timeslots Normal

All timeslots are configured as Normal 8PSK bursts.

GSM 1 Timeslot Normal

Sets timeslot 0 as a normal GSM burst and timeslots 1 to 7 as custom GSM bursts.

EDGE 1 Timeslot Normal

Sets timeslot 0 as a normal EDGE burst and timeslots 1 to 7 as custom EDGE bursts.

GSM/EDGE Mixed All Timeslots Normal

GSM and EDGE Normal Bursts are mixed; alternating GMSK and 8PSK timeslots.

GSM Continuous

Continuous pattern with GMSK modulation.

EDGE Continuous

Continuous pattern with 8PSK modulation.

EGPRS2-A 16QAM All Timeslots Normal

All timeslots are configured as Normal 16QAM bursts.

EGPRS2-B HSR QPSK All Timeslots HB

All timeslots are configured as HSR (HB) QPSK burst.

EGPRS2-A 16QAM Continuous

Continuous pattern with 16QAM modulation.

EGPRS2-B QPSK Continuous

Continuous pattern with HSR (HB) QPSK modulation. 

Advanced GSM/EDGE/EGPRS2-A

Configures timeslot 0 with a coded TCH/FS and all timeslots use Normal GSMK bursts.

Advanced EGPRS2-B

Configures timeslot 0 with a coded UBS-6 and all timeslots use HB QPSK and 3PI/4 rotation.

If you manually change a timeslot to a Normal 8PSK Burst, the training sequence for that timeslot is automatically set to TSC0.

The training sequences are defined as follows:

TSC0

0970897

TSC1

0B778B7

TSC2

10EE90E

TSC3

11ED11E

TSC4

06B906B

TSC5

13AC13A

TSC6

29F629F

TSC7

3BC4BBC

Select User Defined Bits to define custom training sequence bits. See the Closeddrop-down figure.

Guard Period (n bits)

Guard period bits are set by the software.

Figure: Guard Period Lengths Between Different Timeslots

Burst Transition

Burst Transition Guard Period Between Timeslots (In terms of normal symbol periods)

TS0 and TS1 or

TS4 and TS5

Any other timeslot pair

normal symbol period to

normal symbol period

9

8

2. Control Frame

Data for Control Frame

Choice: PN9 |PN15 | User Defined Bits

Default: PN9

Set the data for the control frame within a multiframe setup. Click the Details button in this cell to open the ClosedData Source Selection window. 

Select PN9, PN15 or User Defined Bits. Select User Defined Bits, to Closedcreate a data string.

The buttons in this window are described in Marker Source Selection.

If the Multiframe type parameter at the Carrier n node is set to 13 Multiframe with idle frame, the Data for Control Frame parameter, while appearing as active, has no effect since there is no control frame.

Related Topic

Timeslot (Advanced)