38 Site planning
than is normal for speech. An occasionally elevated error rate does
not indicate a problem with your SIP DECT system. However, if you
consistently see a high error rate, then there is a problem with the
deployment of your SIP DECT system.
Determine cell boundaries
A specific RSSI value on the handset defines the cell boundary range.
Links can be made outside the cell boundary but the audio quality of the
link is poor. The link drops if the handset and the basestation are too far
apart.
ATTENTION
DAPs must be able to receive synchronization signals from at least one other
DAP. This means the DAP must receive a signal strength of -80 dBm or better
from at least one other DAP.
As shown in Figure 10 "Cell boundary terminology" (page 38), the cell
boundary is the furthest point from the cell center where a clear radio
signal can be heard.
The range from the cell center to the cell boundary, or the distance to a
potential cell center from a critical point, is determined by using the cell
boundary value and the deployment tool.
Figure 10
Cell boundary terminology
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 01.07
6 January 2009
Copyright © 2008-2009 Nortel Networks
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