User's Manual

TD 92579EN
15 February 2012 / Ver. H
Installation and Operation Manual
IP-DECT Base Station & IP-DECT Gateway (software version 5.0.x)
111
Impact for the Users
During speech
If the radio stops to handle traffic as described in Sync Lost Counter on page 110, it does
not necessarily mean a disconnected call. In a system with good overlapping coverage it
might be possible to make a handover to another IPBS without disconnecting the call. If
the handset does not quickly find any other IPBS the call will be disconnected and the
handset will indicate “No System”. As soon as the IPBS is synchronized it is available again
for handset communication. The handset will then connect to the system in the same way
as for a normal power on.
In idle mode
In idle mode the user will most likely not discover any problem. Since the handsets have a
short delay before showing “No System” the handset has time to roam to another IPBS.
This requires a good overlap between radio cells to make it possible for the handset to
roam to another IPBS. If no other IPBS is available the handset(s) will indicate “No
System”. As soon as the IPBS is synchronized it is available again for handset
communication. The handset will then connect to the system in the same way as for a
normal power on.
8.11 DECT Sync
8.11.1 Air Sync Overview
This section only applies to the PARI Master.
To see a graphic presentation of the air synchronization in a system, select DECT Sync > Air
Sync Overview.
The internal synchronization for each region is shown separately by an expandable tree
view, see Figure 30. The green, yellow and red dots in the sync tree show the following
sync status for the Radios:
• Green: Synchronized
• Yellow: Synchronized but poor received signal strength (RSSI < -83 dBm)
• Red: Unsynchronized
The grey dot at top in the sync tree shows that it is a reference sync RFPI.