Chapter 2
GSM Call Mode Operation
System parameters
102
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
Configuring individual limits for the PTTs
A power/time template consists of two limit ranges: the upper range and the
lower range.
The upper range is indicated by the red line in the PTT graphics. The values
entered for the upper range form the template for the maximum RF power level
of the mobile; i.e. the mobile’s burst must not exceed those limits at any time.
The lower range is shown by the blue line. The values entered for the lower range
give the power levels the burst must not fall below.
Entering and reading the upper range
Paging
Sets the limits for the random-access bursts either to
Auto
mode or to manual mode (Fix).
In Auto mode, the 4400 will always use the PTT limit param-
eters as given by the relevant GSM specifications. In manual
mode (Fix), only the limits entered on the random-access
burst PTT menu will be used, regardless of GSM band and
the mobile’s peak power level.
Note:
More details regarding the Auto settings can be
found in section
“PTT limits for various GSM bands” on
page 120
.
Entry range:
Auto or Fix
Default:
Auto
NOTE
The entry fields shown below are for normal bursts. The same principles apply
for random-access bursts.
NOTE
The time reference (t = 0) is the beginning of the first bit of the 148 bits of
the normal burst. For details on a normal GSM burst, please check with sec-
tion
“Time slots and bursts” on page 113
.
