Samsung OFFICESERV 7100 Service Manual page 88

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Wireless Interface
This interface uses the wireless frequency band of 2.400~2.4835 GHz and meets the IEEE
802.11b standard. A terminal for voices only(WIP-5000M) is used to forward or receive
voice packets from the wireless section to VoWLAN. Data packets in a wireless section are
forwarded or received by terminals such as laptops and PDAs.
Also, 13 wireless channels are used in Korea while 11 wireless channels are used in USA.
The interfaces occupy bandwidth of 22 MHz per wireless channel. Since the interval
between center frequencies is 5 MHz, any clear channels that do not interfere with wireless
channels should be separated by more than four channels.
WLAN NIC (IEEE802.11b Wireless Board)
The commercial NIC in a PCMCIA interface type that has obtained a wifi certification
certified by WECA is used for the wireless LAN RF WBS24.
The wireless LAN NIC board is configured with three chips of Prism3.0 manufactured by
Intersil Co., Ltd. and external antennas can be installed into the board. If the voice or data
packets forwarded or received in a wireless are occupied in the air section in a CSMA/CA
method first, other BTSs will have opportunities of forwarding or receiving once the first
BTS completes forwarding or receiving. Thus, multiple terminals can forward or receive
packets in a wireless section.
Since multiple terminals occupy the air section in this method, the more terminals are, the
lower the occupancy of the air section for forwarding or receiving is. Thus, throughput in a
wireless section is lowered. About 20 people can use data on a wireless LAN by using one
AP where a wireless IEEE802.11b Direct Sequence Spread Spectrum(DSSS) method is
used based on the users of Internet and e-mails at offices where wireless LAN is used.
The features of the WLAN NIC are as follows:
Wireless standard: IEEE 802.11 b
Data rate: 11/5.5/2/1 Mbps
Modulation: CCK, BPSK, QPSK
Network architecture: Ad-hoc, infrastructure
Security function: WEB 64/128 bit encrypted
Output power: Up to 100 mW(NIC board: 70 mW)
Channel: 13(Non-overlap channels: 3)
Interface: PCMCIA
Frequency: 2400-2483.5 MHz
Antenna gain: 2.0 dBi
Beam-Width: Omni directional(Dipole)
Diversity supported
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