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OLD DOCUMENT (may be usefull)
FEATURES
WLAN, GPRS and GSM compability
Slim design
Built in antennas
Built in battery
62 hours standby
3.5 hours talk time
5 hours continuous data transmission
Head set
Support voice, data, fax, & SMS
BASIC DESCRIPTION OF GISMO
GiSMO is an accessory to the Compaq IPAQ,
which enables the user to have both a GSM / GPRS and WLAN connection.
Size (mm): 149 x 82 x 16,5 *
* 34,7 included iPAQ
GiSMO LED description
Functions
GiSMO has three LED's, green, orange and yellow.
Each LED indicates one function:
- GSM Green
- WLAN Orange
- Charging Yellow (amber)
GSM LED
The green LED is used for indication of GSM status.
The functionality is as follows:
LED off = GSM module off
LED on = GSM module on, not registered
Slow flash = GSM module on, registered
Quick flash = GSM module on, communication in progress
Note: Slow flash = 200ms on / 2 s off
Quick flash = 200ms on / 600ms off
The functionality above is achieved by using pin 52 (GPIO1/Status)
from the GSM module. No extra h/w or s/w is required, just a LED
driver.
WLAN LED
The orange LED indicates the WLAN status.
The functionality is as follows:
LED off = WLAN in GiSMO off (set by operator from iPAQ)
LED on = WLAN on but not within coverage of a WLAN network
LED flash = WLAN on, within coverage of a WLAN network
This functionality is achieved by using pin 54 (MD_RDY) in the
BaseBand processor HFA3861B, a D flip/flop and a gate.
Note: The LED will flash on all valid WLAN frames in the air,
not just on it's own communication. This means that the more intensive
the traffic in the air is, the faster the LED will flash. The
characteristics of the flashing are quite similar to the LEDs
in a LAN hub.
This solution did not require any assistance from Atmel to implement.
Charging LED
The yellow LED is used for charging indications.
The functionality is as follows:
LED off = no charging
slow flash = charging of iPAQ battery, low current charging of
GiSMO battery
mid rate flash = high current charging of GiSMO battery, no charging
of iPAQ battery
quick flash = charging failure or battery failure
LED on = charger on and full battery
Note1:
Slow flash = 1 s on / 1 s off
Mid rate flash = 500 ms on / 500 ms off
Quick flash = 100 ms on / 100 ms off
Note2: high current charging of GiSMO is about 500mA
low current charging of GiSMO is about 240mA
WLAN:
The WLAN Radio is designed for the 2.4GHz ISM Band Radios. These
radios are designed to operate using the 802.11B Wireless LAN
Standard for use in Wireless Networking systems. The design is
based on Intersil Prism II chip set.
Antenna
The antenna is located at the top of the unit and is a part of
the cover. The antenna gain is ±0 dBi (typ).
ADC Anolog to Digital Converter
AGC Automatic Gain Control
AP Access Point
BBP Base Band Processor
BSSID Basic Service Set, it distinguishes a single AP from others
CCK Complementary Code Keying modulation
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
CTS Clear To Send
DAC Digital to Analog Converter
DBPSK Differential Binary Phase Shift Keying modulation
DQPSK Differential Quadrature Phase Shift Keying modulation
DSSS Direct Sequence Spread Spectrum
EIRP Effective Isotropic Radiated Power
EMC Electro Magnetic Compatibility
EMI Electro Magnetic Interference
ESD Electro Static Discharge
IEEE 802.11b A standard for Wireless LAN specified by IEEE, allowing
the high- speed communication between computers
ISM Industrial, Scientific and Medical frequency band
LED Light Emitting Diode
LNA Low Noise Amplifier
LO Local Oscillator
MAC Medium Access Controller
Modem Modulator/Demodulator
PA Power Amplifier
RF Radio Frequency
RTS Ready To Send
SNR Signal Noise Ratio
WEP Wired Equivalence Privacy module; this module incorporated
in the MAC offers secure wireless connections as described by
the IEEE 802.11 standard
WLAN Wireless Local Area Network
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