52 System Feature Overview
April 2011 68007024085
The window size is dependent on the amount of GPS data to be sent, the privacy mode and
header compression usage. Based on window size, the number of windows in a 30-second data
frame is shown in the following table:
A repeater’s slot that is configured with “Enhanced GPS” maintains allocations of all the windows.
At the beginning of every window, the repeater sends an announcement containing the current
window number, data frame and the ID of the subscriber for the next reserved window. The
Figure 2-10 Windowed Data Structure for a Window Size of Six
Window Size
(Includes Announcement Burst)
Number of Windows
(in a 30-second data frame)
5100
683
771
862
955
10 50
Data
Frame
0 1 2 3 8079 8281
A B A B A B A
Announcement
On Slot Off Slot
CSBK
Data
Header
Proprietary
Header
½Rate
Data
½Rate
Data
½ Rate
Data
B A B A
0 1 2 13 14 15
30 seconds
8 min
Single Site, encrypted example
Data
Superframe
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