AASTRA SIP-DECT (Release 2.1)- OM System Manual - Installation, Administration and Maintenance EN - Manual (Page 125)

SIP – DECT OM System Manual Release 2.1 7 Configuration und Administration Aspects
depl-1230/1.3 Page: 125 (196)
- If no message was received within the 30 seconds this stage will be terminated and the
next stage will be started.
- If no preferred RFP was configured, this stage will be ignored.
• Synchronization stage 1
- If a preferred RFP was determined in stage 0, this one will be the synchronization
source for the next upcoming RFPs. Otherwise the first RFP which sends a startup
message will be the synchronization source for the next upcoming RFPs.
- In this stage only RFPs reporting an RSSI value better than -65 dBm will be permitted
to do a synchronization.
- If an RFP has done its synchronization, this RFP will be also a synchronization source
for other upcoming RFPs.
- The initial timeout for this stage is 30 seconds. Whenever an RFP has finished its
synchronization in this stage a new stage timeout value will be calculated.
- If no RFP comes up within the timeout time or if all the upcoming RFPs do not fit the
RSSI threshold, this stage will be terminated and the next stage will be started.
• Synchronization stage 2
- The behavior of this stage is identical to stage 1, but an RSSI threshold value of
-70 dBm is significant.
• Synchronization stage 3
- The behavior of this stage is identical to stage 1, but an RSSI threshold value of
-75 dBm is significant.
• Synchronization finished
- No more RSSI threshold value is significant. All the RFPs which failed the stage
conditions above, are now permitted to do a synchronization.
The last level “synchronization finished” will be achieved either all registered RFPs of this
cluster are synchronized or the timer of stage 3 expires.
7.2.2 Checking the Synchronization of a Network
For every cluster a periodically check of the synchronization of the network is done. If the
network is split into at least two subnets, all the RFPs of the lesser subnet(s) will be
resynchronized. While doing initial synchronization procedure this check is deactivated. You
can check the RFP synchronization using the Sync view menu of the OM Management
Portal (OMP), see chapter 6.7.5.
7.3 RFP Channel Capacity
On air the RFP has 12 available time slots, 8 can have associated DSP resources for media
streams. All DECT time slots are used for control signaling, SW download over air,
messaging and bearer handover independent of associated DSP resources.
If all 8 media stream channels are used the RFP announces a “busy bit”. In that case the
PPs determine whether another RFP has an appropriate signal strength. If so, the PP will
handover to that RFP. Once the handover has been completed, the RFP will then lower its
“busy bit”.