CH Tech EM405D - Manual (Page 19)

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of other tasks. In ad-hoc mode, wireless devices may communicate directly with each other and
an access point is not needed. In this case, all devices on the network must be configured to use
ad-hoc mode. The default network mode is: infrastructure.
SSID: The Set Service Identifier (SSID) is a name given to a wireless access point to identify
the access point on a wireless network. Most access points can be configured to periodically
broadcast the SSID or to keep it private. Wireless devices can query the network for known
SSID and thus communicate with access points that do not broadcast it. The EM405D can be
configured to communicate with any available SSID or to query for a specific SSID and use the
owning access point if found. The default setting is to use any available SID.
Channel: The 802.11b specification defines a total of 14 frequency channels that can be used for
wireless communication. However, not all channels may be available for use. For example, the
FCC only allows for the use of channels 1 through 11 in the US; whereas most of Europe can use
channels 1 through 13. Other countries or locations may differ. All wireless communication is
done over a common channel. Another consideration in regards to channels is interference.
Interference can occur between access points or may be caused by other equipment such as
microwave ovens and cordless phones. The EM405D can be set to auto-scan mode in which the
device searches for the best wireless channel or it can be configured to use a specific channel.
The default setting is: Auto-Scan.
Country: Some countries restrict certain channel ranges and other transmission properties. The
EM405D should be configured for the country in which the device is being used. The default
setting is: USA.
Security Settings: The EM405D supports WEP and WPA security protocols. WEP is an
encryption protocol used for secure data transfers. WPA is an authentication protocol used to
authenticate and associate a device and a wireless access point. WPA is not available in ah-hoc
mode. The security settings must be set according to the wireless network being connected to.
The default settings are: WEP disabled and WPA disabled.
4.2.6 Performing the Configuration – Wired Ethernet
There are two ways to configure the wired version of the EM405D: a web-based interface and a
Telnet interface. Both ways work equally as well and the choice of which to use is based solely
on the user’s preferences. In either case, the IP address of the module must be known to perform
the configurations. If the IP address of the module is not known, one can be assigned to the
module as discussed in section 4.2.6.3.