Change time alignment
WHY?
A change of time alignment can be made in complex
handoff procedures but shows no effect in the basic test
mask. It is not possible to see whether the mobile ac-
tually executes the time-alignment instruction from the
base station correctly until the BURST mask has been
called up.
Requirement
The mobile is not in test mode.
Make the general test preparations. The channel type
must be To digital TC.
Initiate a call with
{MOBILE}
or
{CELL.}
(the mobile must be
in a digital traffic channel).
HOW?
Enter a new figure in the TIME ALIGNMENT field. Con-
firm your entry with
[ENTER]
.
Press
{EXECUTE}
in the basic test mask. In this way
signaling adopts the new time alignment.
Test Results
D
No test result in basic test mask. Call up BURST mask with
{BURSTS}
.
Fig. 10.17: Time alignment can only be
changed in basic test mask. For explanation
of terms, see "Burst Power & Time Align-
ment".
10
Handoff Procedures IS-136 MS
10-27
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