3Com WX4400 Reference Manual page 347

Figure 9 shows the location of the Fn switch and the LED.
Figure 9 Fn Switch on WXR100
5 Because the Fn switch was pressed while the switch was starting, the
WXR100 configures the following items to enable itself to contact 3WXM
Services:
Ports 1 and 2 in the default VLAN (VLAN 1)
DHCP client on VLAN 1 enabled
6 The WXR100 uses the DHCP client to obtain an IP configuration from a
local DHCP server. After obtaining an IP configuration, the switch sends a
DNS query for the IP address of well-known hostname wlan-config-srv.
7 DNS replies with the IP address of the host where 3WXM Services are
installed. The WXR100 sends a configuration request to 3WXM Services.
8 3WXM receives the configuration request, and looks in the currently
selected network plan for a WXR100 configuration with the same serial
number as the one in the configuration request.
If the network plan contains a configuration with a matching serial
number, 3WXM deploys the configuration to the switch. (See
"Preconfiguring a Switch in 3WXM".)
If the network plan does not have a configuration with a matching
serial number, one of the following occurs:
If the Auto-Config IP Subnet Matching is enabled and other
requirements are met, 3WXM can give the configuration to another
switch with a different serial number, if the switch is the same model
and is in the same IP subnet. (See "Replacing a Switch and Reusing
its Configuration" on page 356 for more information.)
How Remote WX Configuration Works 347