Broadcom BRCM1007 Dual-Band Wireless LAN Mini PCI Card User Manual Technical description rev 1 1
Broadcom Corporation Dual-Band Wireless LAN Mini PCI Card Technical description rev 1 1
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Contents
Indoor statement
Technical Description
Broadcom Wireless LAN mini-PCI Card,
model BCM94309MP
Data Transmission Rates 802.11b:
11 and 5.5 Mbit/s
2 Mbit/s
1 Mbit/s
8-chip complementary code keying (CCK)
11-chip differential quadrature phase shift
keying (DQPSK)
11-chip differential binary phase shift keying
(DBPSK)
Data Transmission Rates 802.11a/g:
54,48,36,24,18,12,9 & 6Mbits/s
Orthogonal Frequency Division Multiplexing
(OFDM)
Antenna (highest gain):
Type:
Maximum Gain - 2400-2500MHz:
Maximum Gain - 5150-5350MHz:
1.45dBi
5.6dBi
Special FCC Requirements
Frequency Stability (15.407 (g))
FCC 15.407(g) states: “Manufacturers of U-NII devices are responsible for ensuring frequency
stability such that an emission is maintained within the band of operation under all conditions of
normal operation as specified in the users manual.”
The device uses 8 channels between 5.18GHz and 5.32GHz. The carrier is 20MHz wide centered
at these frequencies. IE: Channel 32 (5.18GHz) would have the fc centered at 5.18GHz with a
band width of 20Mhz or 5.17 to 5.19 GHz. This provides a guard band of 20 MHz (5.17 GHz -
5.15 GHz).
The device also requires a +/- 20 ppm XTAL over temperature and with aging. This is required
per the 802.11a specification. Based on the tolerance of the XTAL and the 20 MHz guard band
between 5.15GHz and 5.35 GHz the device will maintain emissions within the UNII 1 and 2 bands
under normal operating conditions specified in the user manual.
Insuring Indoor Use in 5.15-5.25 GHz Band (15.407 (e))
FCC 15.407(e) states: “Within the 5.15-5.25 GHz band, U-NII devices will be restricted to indoor
operations to reduce any potential for harmful interference to co-channel MSS operations.”
The user manual includes the following statement: “This device is restricted to indoor use only.
Industry Canada and the FCC requires this product to be used indoors due to its operation in the
frequency range 5.15 to 5.25 GHz”
Discontinue Transmitting with absence of Data or operational failure (15.407 (c))
FCC 15.407(e) states: “The device shall automatically discontinue transmission in case of either
absence of information to transmit or operational failure. These provisions are not intended to
preclude the transmission of control or signaling information or the use of repetitive codes used
by certain digital technologies to complete frame or burst intervals. Applicants shall include in
their application for equipment authorization a description of how this requirement is met.”
Data transmission is always initiated by software, which is then passed down through the MAC,
through the digital and analog baseband, and finally to the RF chip. Several special packets
(ACKs, CTS, PSPoll, etc...) are initiated by the MAC. These are the only ways the digital
baseband portion will turn on the RF transmitter, which it then turns off at the end of the packet.
Therefore, the transmitter will be on only while one of the aforementioned packets is being
transmitted.