current connection). This DAP issues a multicast on the network to determine on which
DAP the voice connection exists. The DAP, with the existing voice connection, responds
and then the connection can be redirected from the DAP with the existing voice connection
to the new DAP.
• Synchronization between DAPs You must configure multicast before synchronization can
occur between DAPs in the SIP DECT system.
All network components must support forwarding of IP multicast packages. The IP DECT
Configurator proposes a default multicast IP address (239.192.49.49). This is a multicast
address in the private multicast IP address range for use in private IP networks. If you are not
sure you can access this address, contact the local IT manager.
Important:
You must disable IGMP Snooping and Spanning Tree Protocol on switch ports where SIP
DECT equipment is connected. For more information, see DAP multicast group
membership on page 259.
Location requirements
Comply with the following requirements for DAP
location:
• Ensure that the location complies with local electrical codes.
• Install DAPs indoors where no condensation occurs and the temperature remains within
the range of 0°C to 40°C. (of -20C to +40C for external housing).
• Install the C4710 and C4710E DAPs in a vertical position. The radiation pattern differs
between the horizontal and vertical positions. The 4720 and 4720E can be installed
horizontally only if you change the antenna position. For more information, see
Adjusting
the antenna position on page 177
•
Do not mount a DAP to a metal surface.
• Do not roll up the extra cabling behind a DAP.
• Position DAPs upright on walls. DAPs must be at least 30 cm from the ceiling.
• Position DAPs at least 1 meter (m) from large concrete or stone columns and from major
building structural members such as support beams or columns.
• Position the DAPs high enough to clear obstructions between the DAPs and the cell edge
close to the ceiling.
• Mount the DAPs clear of obstacles such as pipes or ducts.
For more information about the 4720 DAP mounting procedure, see
Mounting the 4720 DAP
on a wall on page
180
To install the DAPs outdoors, see
Install the external housing on page 217
.
Site planning and hardware deployment
26 SIP DECT Fundamentals October 2012
Comments? infodev@avaya.com
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