SDC-CF20G
Hardware Integration Guide
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S
COPE
This document describes key hardware aspects of the Summit SDC-CF20G
802.11a/g compact flash radio module. 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 Summit or visit the Summit website at
the most recent version of this document.
O
PERATIONAL
D
ESCRIPTION
This device is an SDC-CF20G 802.11b/g compact flash card with an integrated antenna, which operates in
the 2.4 GHz portions of the radio frequency spectrum. The device is compliant with IEEE 802.11b and
802.11g standards using Direct Sequence Spread Spectrum and Orthogonal Frequency Division Multiplexing.
The device supports all 802.11b and 802.11g data rates and automatically adjusts data rates and operational
modes based on various environmental factors.
The SDC-CF20G is compliant with Compact Flash Type 1 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. To maximize operational range, the SDC-CF20G incorporates a 2.4 GHz Power
Amplifier to increase transmit power to as much as 15 dBm (30 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) operation is +/-
20 ppm.
The CF20G has its own RF shielding and does not require shielding provided by the host device into which it
is installed in order to maintain compliance with applicable regulatory standards. As such, the device may be
tested in a standalone configuration via an extender card.
The device buffers all data inputs so that it will comply with all applicable regulations even in the presence of
over-modulated input from the host device. Similarly, the SDC-CF20G incorporates power regulation to
comply with all applicable regulations even when receiving excess power from the host device.
The CF20G card includes two 0-dBi omnidirectional antenna elements under a sturdy plastic cover.to support
transmit and receive diversity.
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-CF20G is installed. The SDC-20G 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.
