32 Site planning
• IP addresses and routing must be consistent with each other to deliver
the required transparency. IP addresses must be consistent with
routing for normal unicast traffic as well as for the required multicast
traffic.
• The maximum cable length between the DAP and IP network
equipment, such as a switch, is 100 meters if a Category 5, unshielded
twisted pair half-duplex cable is used. If the required cable length
between the IP network equipment and the DAP exceeds 100 meters,
use Long Range Ethernet equipment in the connection. Several
manufacturers offer such a solution, which allows cable lengths of
more than one km.
Fixed IP network addresses
You must provision fixed IP addresses for the following servers.
• TFTP server
The TFTP server stores the configuration file and the firmware that
must be available to the DAPs. After a DAP starts up, the DHCP
server sends the DAP the IP address of the TFTP server. The DAP
then downloads the configuration files from the TFTP server. The
TFTP server often runs on the DAP controller or manager PC.
•
DNS server (optional)
The DHCP server sends the address of the DNS server to the DAP.
The DAP does not support Domain Name Resolution.
•
DAP controller or manager
The DAP controller or manager requires a fixed IP address. The DAPs
retrieve this fixed IP address from the configuration file that the DAP
loads from the TFTP server.
•
Gatekeeper and PABX address.
The IP address of the PABX must be reachable either through a router
or directly.
The PABX is sometimes referred to as Gatekeeper or SIP proxy,
depending on the type of PABX that is used.
To make network management easier, it is recommended that fixed IP
addresses are also assigned by the DHCP server. The DHCP server must
know the hardware MAC addresses of all servers, to be able to assign the
proper (fixed) IP addresses to each individual server.
It is possible to store the IP address of the DAP in its Flash memory. If the
IP address is stored, the DHCP server is needed only for the first startup.
After that the DAP has its own IP address.
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 01.07
6 January 2009
Copyright © 2008-2009 Nortel Networks
.
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