ISL36356A Intersil Corporation, ISL36356A Datasheet - Page 3

• Manufacturer Part Number: ISL36356A
• Description: Prism 11Mbps Wireless Local Area Network Access Point
• Manufacturer: Intersil Corporation

Functional Overview
The WLAN AP is designed to operate in the 2.4GHz ISM
frequency band, channels 1–11, as specified by the FCC in the
U.S. The AP will also operate on channels 12–14, where
permitted by local regulatory authorities. Radio equipment must
be certified in a given country prior to use. Refer to Table 3 for a
list of countries and agencies that have approved the
ISL36356A-ABPK-EVAL for operation.
The Intersil PRISM 2 AP chip set allows for high-level
integration; providing reduced size, increased throughput,
improved radio performance and faster time to market. The
WLAN AP implements DSSS technology that provides
superior noise and signal jamming immunity; including less
severe impact from unintentional radiators such as
microwave ovens. By using an AP, the wireless LAN can be
set up to allow an even greater number of users to
interconnect, and to increase the coverage area. The
wireless LAN can be easily connected into an existing wired
LAN, allowing for easy expansion of the service.
The ISL3856 Media Access Controller
(MAC) Protocol Handler
The ISL3856 MAC processor and its firmware are
responsible for running the IEEE 802.11 protocol in the
WLAN AP. This section describes the features of IEEE
802.11 that are implemented.
The functions supported by the AP Firmware are:
• CSMA /CA (carrier sense multiple access with collision
• WEP security
• Short/long preamble with multirate
• RTS/CTS handshake (ready to send/ clear to send)
• MAC-level acknowledgments
• Re-transmission of unacknowledged frames
• Duplicate detection and rejection
• Broadcast and multicast frames
• Fragmentation and re-assembly
• Supports client’s power save mode
• Timestamp synchronization
• DCF (distributed coordination function)
avoidance) with random backoff
3
ISL36356A-APBK-EVAL
IEEE 802.11 International Agreement and
Frequency Assignments
The IEEE 802 LAN committee has forged an international
agreement providing for wireless data communication
standards for the frequency range of 2.4–2.4835GHz, as
allocated by the FCC in the USA, and in the 2.471–2.497GHz
frequency range, as specified by the regulatory authority in
Japan. These standards are designed to focus the industry
to develop highly integrated, low-cost, interoperable WLAN
equipment, of which the ISL36356A-ABPK-EVAL is a prime
example.
In the U.S., there are 11 channels specified by the FCC in
the 2.412GHz to 2.462GHz range. In Japan, channel 14 at
2.484GHz is authorized under ARIB STD-33 and channels
1-13 are authorized under ARIB STD-T66. The ETSl
(European) regulatory body conforms to the USA (FCC)
channel assignments with the exception that channels 12
and 13 are also allowed. Some countries in Europe, notably
France and Spain, have unique channel restrictions.
Although information contained in Table 2 is deemed to be
accurate, local regulatory authorities should be consulted
before using such equipment.
The available channels of operation in the 2.4GHz to
2.4835GHz and 2.471GHz to 2.497GHz ranges are as follows:
KEY:
CHANNEL
NUMBER
US = United States, CA = Canada, EU = European
countries (except France and Spain), FR = France,
SP = Spain, JP = Japan
10
11
12
13
14
1
2
3
4
5
6
7
8
9
TABLE 2. IEEE 802.11 CHANNELS
FREQUENCY
CHANNEL
2412MHz
2417MHz
2422MHz
2427MHz
2432MHz
2437MHz
2442MHz
2447MHz
2452MHz
2457MHz
2462MHz
2467MHz
2472MHz
2484MHz
US, CA, EU, JP, FR, SP
US, CA, EU, JP, FR, SP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
US, CA, EU, JP
GEOGRAPHIC
US, CA, EU,
EU, FR, JP
EU, FR, JP
USAGE
JP