User guide

TD 92422GB
18 February 2010 / Ver. E
System Planning
Ascom IP-DECT System
21
8.2 Check the speech coverage for base station A
7 Check on the portable device that the signal strength is > -68 dBm which is the
normal case to get sufficient speech quality within each base station.
8 Verify that the speech quality is sufficient by listening on a call. When the off-hook
key is pressed, the speech is looped back. However, when the off-hook key is
pressed on an anonymous portable device a dial tone is heard and when a digit is
pressed the speech is looped back.
In certain environments, for example reflective environments (large rooms with lots
of metal), there might be a need for a considerable stronger signal strength more
than -68 dBm in order to get sufficient speech quality.
9 Mark on a map the position and the speech coverage for base station A.
8.3 Check the synchronization coverage
10 Use the GUI web interface on base station B and check that the signal strength
from base station A to base station B is stronger than -83 dBm. If this is not the case
then you should consider to move base station B closer to base station A to get a
stable synchronization coverage for a longer time.
You can also check the synchronization by looking at LED2 (upper LED) on the base
station. For a description of LED2 deployment indications, see the diagram in
figure
11 on page 22. When indicating no sync (LED flashing red) it might take some
additional time (10 to 30 seconds) to regain synchronization when entering the
sync coverage again.
Figure 10. LED2 on the IPBS.
LED2
010