Ip Network Configuration - Nortel CS 1000 Manual

double distance, 2X, is --78 dBm. For more information, see
"Signal strength considerations" (page
Figure 4
Signal strength considerations
•
An open area has more than sufficient signal strength for
synchronization. The expected level at the double distance is --78
dBm. The required level is --80 dBm to --85 dBm. This leaves a safely
margin of 2 to 7 dB.
•
Obstructions between the DAPs can introduce loss. Also, many objects
cause reflections that let the signal reach the DAPs through other path
with sufficient signal strength.
•
In rare cases, factors in the surrounding environment can cause
the error rate in the received frames to be temporarily much higher
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.
Frame errors
Frame errors rarely can occur in DECT. The number of frame errors for
each reading may not be more than four. The most common cause of
frame errors higher than four is a high number of reflections. This causes
an audible click during calls.
IP network configuration
The IP network must be able to support SIP DECT; this section provides
information about planning an IP network that is suitable for supporting
SIP DECT.
Copyright © 2008-2010 Nortel Networks. All Rights Reserved.
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 02.02 30 March 2010
Deployment requirements 23
23).
Figure 4