Advertisement
•
Frequency Hopping Spread Spectrum (FHSS) uses a narrowband
carrier that changes frequency in a pattern that is known to both
transmitter and receiver. Properly synchronized, the net effect is to
maintain a single logical channel. To an unintended receiver, FHSS
appears to be short-duration impulse noise.
•
Direct Sequence Spread Spectrum (DSSS) generates a redundant
bit pattern for each bit to be transmitted. This bit pattern is called a
chip (or chipping code). The longer the chip, the greater the
probability that the original data can be recovered. Even if one or
more bits in the chip are damaged during transmission, statistical
techniques embedded in the radio can recover the original data
without the need for retransmission. To an unintended receiver,
DSSS appears as low power wideband noise and is rejected (ignored)
by most narrowband receivers.
© 2003 Cisco Systems, Inc. All Rights Reserved.
Knowledge Check
Model No : WAP51AB
Advertisement
Troubleshooting
