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TFTP Server planning 39
Only one TFTP server is needed in the network, and it need not be
colocated with the handsets or the WLAN IP Telephony Manager 2245.
There is a client-dependent aspect to how the handsets function with the
TFTP server. How well a server works with the handsets can vary between
code versions on the handset.
You can configure handsets to not contact the TFTP server upon boot up, by
configuring 255.255.255.255 as the IP address for the TFTP server (either
directly in the handset or through the DHCP option). You can configure
the WLAN IP Telephony Manager 2245 to not contact the TFTP server by
changing the TFTP server address to none in the configuration.
The following information must be considered when planning for a TFTP
Server:
•
The process for the wireless handset to check its version of firmware
against what is available on the TFTP Server takes less than two
seconds on a quiet network.
•
If the TFTP Server is offline or unreachable, the wireless handset tries
for about 10 seconds before giving up and using its existing version
of firmware.
•
The wireless handset firmware downloading process takes about 30
seconds.
•
The TFTP Server must be capable of supporting multiple TFTP sessions.
•
When a wireless handset makes a TFTP request, it uses file names
without a full path name. Therefore, software updates for the WLAN IP
Telephony Manager 2245 and handsets must be installed into the root
directory of the TFTP Server.
When the software files are uploaded to the TFTP server. they must be
unzipped. Allow time for the TFTP server to refresh and be aware of the files
before attempting to download software to the wireless handsets and WLAN
IP Telephony Manager 2245. Monitor the TFTP Server for any errors.
The TFTP Server can be located anywhere on the network if the wireless
handsets have the subnet mask and default IP gateway configured correctly.
However, the wireless handset expects a response within two seconds to
any TFTP request. Therefore, the TFTP Server must not be located, for
example, at the other end of a slow WAN link.
If too many wireless handsets are attempting to download new software
simultaneously, the downloads can slow down or return error messages. To
reduce the number of retries and error messages, manage the download
process by staggering the times the wireless handsets download the
software.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.