Specifications

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NOTE: The following section refers to EM-X270 - revisions 1.2 and older.
The EM-X270 incorporates full-featured 802.11b capability implemented using a Phillips
BGW200 WLAN controller. The implementation contains a baseband MAC subsystem,
RF transceiver and high-power RF front-end, thus incorporating all the components
required to provide high-quality WLAN capability.
The BGW200 is based on an internal controller sub-system with dedicated CPU, ROM and
RAM. The sub-system executes firmware, responsible for all low-level WLAN networking
functionality, thus considerably reducing the load on the main CPU.
The RF interface supports antenna diversity for improved stability. It provides +16dBm
transmitter output power - the standard level for 802.11 NIC’s.
BGW200 firmware supports both infrastructure (access point managed) and independent
(without access point) network topologies. On the other hand, firmware does not support
BGW200 acting as an access point.
Security features:
• WEP64
• WEP128
Other firmware features:
• Extended rate protection
• Regulatory domain
• Power save protocol
• Fragmentation & De-fragmentation
• Antenna diversity
Infrastructure/Ad-hoc modes:
• BSS
• IBSS
The BGW200 is connected to the PXA-270 CPU using the SPI #2 interface.
Antenna Connection
The EM-X270 features a small on-board ceramic patch antenna dedicated to WLAN
connectivity. Alternatively, an external antenna may be connected via the on-board high
frequency connector. Any type of 2.45GHz WLAN antenna can be used. See section 4.12
for a detailed connector description.
Note: An external antenna cannot operate together with the on-board patch antenna. In
order to use an external WLAN antenna, the on-board antenna must be disconnected.