SDC-CF22AG
Hardware Integration Guide
Embedded Wireless Solutions Support Center:
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S
COPE
This document describes key hardware aspects of the SDC-CF22AG 802.11a/g
Compact Flash Radio Card. This document is intended to assist device manufacturers
and related parties with the integration of this radio into their host devices. Data in
this document is drawn from a number of sources and includes information found in
the Broadcom BCM4318E data sheet issued in July of 2006.
The information in this document is subject to change without notice. Please contact
Laird or visit the
CF22AG page of the Laird website
to obtain the most recent version
of this document.
O
PERATIONAL
D
ESCRIPTION
This device is an SDC-CF22AG 802.11a/g Compact Flash card with an integrated antenna, which operates in
the 2.4 GHz and 5 GHz portions of the radio frequency spectrum. The device is compliant with IEEE 802.11a,
802.11b, and 802.11g standards using Direct Sequence Spread Spectrum and Orthogonal Frequency Division
Multiplexing. 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.
When operating on channels in the UNII-2 and UNII-2 Extended bands that are in the 5 GHz portion of the
frequency spectrum and are subject to Dynamic Frequency Selection requirements, the SDC-CF22AG fully
conforms to applicable regulatory requirements. In the event that specified types of radar are detected by the
network infrastructure, the SDC-CF22AG fully conforms to commands from the infrastructure for radar
avoidance.
The SDC-CF22AG is compliant with Compact Flash Type 2 mechanical specifications and interfaces to host
devices via a 50-pin connector. The device is based on the Broadcom BCM4318e chip which is an integrated
device providing a Media Access Controller (MAC), a Physical Layer Controller (PHY or baseband processor)
and a 2.4 GHz transceiver. The SDC-CF22AG incorporates an external 5 GHz transceiver to allow for dual
band operation. To maximize operational range, the SDC-CF22AG incorporates 2.4 GHz and 5 GHz Power
Amplifiers to increase transmit power to as much as 19 dBm (80 mW) and a 2.4 GHz Low Noise Amplifier to
improve receiver sensitivity. The frequency stability for both 2.4 GHz (802.11b and 802.11g) and 5 GHz
(802.11a) operation is +/- 20 ppm.
The SDC-CF22AG is powered by the host device into which it is installed and uses a DC to DC regulator. The
SDC-CF22AG incorporates four separate antenna “chip” elements to provide an omnidirectional coverage
pattern and to support dual band transmit and receive diversity. Typical host devices include: (1) Portable Data
Terminals (PDTs) and (2) Vehicle Mounted Terminals (VMTs).
The device is labeled with all applicable regulatory information in a manner that’s compliant with all regulatory
standards. Regulatory operational requirements are included with this document and may be incorporated
into the operating manual of any device into which the SDC-CF22AG is installed. The SDC-22AG is designed
for installation into mobile devices such as vehicle mount data terminals which typically operate at distances
greater than 20 cm from the human body and portable devices such as handheld data terminals which
typically operate at distances less than 20 cm from the human body. See “
” for
more information.
