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24 A
PPENDIX
A: A
IR
C
ONNECT
O
VERVIEW
Straight-through cable pinout:
When using a modem connection, one AP represents the originating AP and the
other represents the answering AP. When using a PPP link, do not use the serial
port to access the UI. Access to the UI requires establishing a Telnet session with
the AP.
Direct-Sequence
Spread Spectrum
Direct Sequence Spread Spectrum
(DSSS) uses a high-speed, non-information
bearing signal to spread the transmitted information over a segment of the radio
frequency band or spectrum. The AirConnect access point uses DSSS for radio
communication.
Direct-sequence systems communicate by continuously transmitting a redundant
pattern of bits called a
chipping sequence
. Each bit of transmitted data is mapped
into
chips
by the access point to find the chipping sequence corresponding to the
output signal.
Wireless clients receiving a direct-sequence transmission use the same chipping
sequence to recreate the original data transmitted by the access point.
Intercepting and decoding a direct-sequence transmission requires a predefined
algorithm to associate the chipping sequence used by the transmitting access
point to the receiving wireless client. This algorithm is established when the access
point and wireless client are configured. The bit redundancy within the chipping
sequence enables the receiving wireless client to recreate the original data pattern,
even if bits in the chipping sequence are corrupted by interference.