User's Manual

Table Of Contents
TD 92579EN
15 October 2014 / Ver. M
Installation and Operation Manual
IP-DECT Base Station & IP-DECT Gateway (software version 7.2.X)
90
There are five reasons for when the sync lost counter is incremented:
The IPBS has not been able to find a synchronization source within 9 minutes.
The PSCN value is changed.
The value for frame number is changed.
The value for multi frame number is changed.
The number of enabled carriers is changed.
If the PSCN, frame number, multi fra
me number and/or the number of enabled carriers is
changed, then the radio stops to handle traffic immediately.
Impact for the Users
During speech
If the radio stops to handle traffic as described in Sync Lost
Counter on page 89, 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 pr
oblem. 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.
4.11 DECT Sync
4.11.1 Air Sync Overview
This section only applies to the PARI Master.
T
o 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 12. 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.