802.11 Wireless Overview
Configuring WLAN Network Settings
3-2 Efficia CM Series Network Configuration Guide
If the network is unavailable and the Data Export function is enabled, the trend data
remains in the tabular trend display at the monitor, but the data is not exported. When
the network connection is re-established, the monitor resumes exporting any alarms that
were not exported, and new trend data (the monitor does not resend old trend data).
If the server finds an error in the exported data, it returns a negative ACK message to the
monitor. The rejected record in the tabular trend display changes from white to blue. If
programmed at the server, the negative ACK message may contain an error message that
indicates the reason the record was rejected.
Note — The Efficia Central supports only LAN network connections; WLAN is not
supported on the Efficia Central.
802.11 Wireless Overview
The Efficia CM Series monitor uses a radio module, which operates in the unlicensed
portions of the 2.4 GHz and 5 GHz radio frequency spectrum. The device is compliant
with IEEE 802.11a, 802.11b, 802.11g, and 802.11n standards using Direct Sequence Spread
Spectrum (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM). The device
supports all 802.11a, 802.11b and 802.11g data rates and automatically adjusts data rates
and operational modes based on various environmental factors.
The device supports OFDM, HT20, MCS 0-7, 802.11a, 802.11b, 802.11g, and 802.11n data
rates.
The radio also complies with 802.11a, 802.11b, 802.11e, 802.11g, 802.11h, 802.11i, 802.11n,
which are the 802.11 standard amendments that addresses interference issues, and
802.11d, which is described in the following section.
802.11d Support
Note — If your infrastructure does not support 802.11d, the Worldwide regulatory domain
setting will result in a limited subset of supported channels. If you experience
performance issues, contact the Philips Customer Care Center for assistance.
The radio supports 802.11d, which is the IEEE standard for the operation of a WLAN radio
in multiple regulatory domains. If the access points (APs22) in your WLAN also support
802.11d, the AP can send a country information element to the radio during the initial
association process. After receiving the country information element, the radio configures
its channel set and maximum transmit power for that country. The radio uses 802.11d
when it tries to associate on an SSID for the first time or after a disconnect. The radio
assumes that all APs with the same SSID have the same 802.11d country code; as a result,
the radio ignores the country code when roaming from one AP to another.
If your infrastructure supports 802.11d, make sure that every AP on your WLAN:
• Supports 802.11d
• Specifies the correct country information element
• Broadcasts its SSID
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