SDC-EC25N
Hardware Integration Guide
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S
COPE
This document describes key hardware aspects of the Summit SDC-EC25N wireless LAN radio card. This
document is intended to assist device manufacturers and related parties with integration of this card into
their host devices. Data in this document are drawn from a number of sources and includes information
found in the Broadcom BCM4322 data sheet issued in August of 2008.
O
PERATIONAL
D
ESCRIPTION
This device is an SDC-EC25N, an IEEE 802.11n-compliant Peripheral
Components Interconnect Express (PCIe) Card which operates in the 2.4 GHz
and 5 GH portions of the radio frequency spectrum. The device is compliant
with IEEE 802.11a, 802.11b, 802.11g, and 802.11n 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 select
802.11n 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 5GHz portion of the frequency spectrum and are subject to
Dynamic Frequency Selection requirements, the SDC-EC25N fully conforms
to applicable regulatory requirements. In the event that specified types of
radar are detected by the network infrastructure, the SDC-EC25N fully
conforms with commands from the infrastructure for radar avoidance.
The SDC-EC25N is compliant with 32-bit PCIe Express Card mechanical specifications and interfaces to host
devices via a 26-pin connector. The device is based on the Broadcom BCM4322 chip which is an 802.n
compliant integrated device providing a Media Access Controller (MAC), a Physical Layer Controller (PHY or
baseband processor), and fully integrated dual-band antenna that provides 2x2 antenna and MIMO support.
The frequency stability for both 2.4 GHz (802.11b and 802.11g) and 5 GHz (802.11a) operation is +/- 20
ppm.
The SDC-EC25N 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-EC25N incorporates power regulation to
comply with all applicable regulations even when receiving excess power from the host device.
The SDC-EC25N incorporates an antenna that supports dual band diversity when operating in 802.11a,
802.11b and 802.11g modes and 2 x 2 MIMO support when operating in 802.11n mode.
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 are to be
incorporated into the operating manual of any device into which the SDC-EC25N is installed. The EC25N is
designed for installation into mobile devices such as notebook computers which typically operate at distances
greater than 20 cm from the human body. See “
” for more information.
