Cambium Networks PMP/PTP 450i Series, User Manual

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Chapter 1: Product description Wireless operation
Page 1-16
MIMO
Multiple-Input Multiple-Output (MIMO) techniques provide protection against fading and increase the probability
that the receiver decodes a usable signal. When the effects of MIMO are combined with those of OFDM
techniques and a high link budget, there is a high probability of a robust connection over a non-line-of-sight path.
The sub-features that comprises the MIMO techniques utilized in the PMP/PTP 450 platform product are:
•
Matrix A: This technique enables the 450 platform radio to use a scheme that optimizes coverage by
transmitting the same data over both antennas. This redundancy improves the signal to noise ratio at the
receiver making it more robust, at the cost of throughput.
•
Matrix B: This technique provides for the ability to double the throughput of a radio transmission under
proper RF conditions. Different data streams are transmitted simultaneously on two different antennas.
Encryption
The Cambium 450 platform Series supports optional encryption for data transmitted over the wireless link. The
PTP 450 platform Series supports the following forms of encryption for security of the wireless link:
•
DES (Data Encryption Standard): An over-the-air link encryption option that uses secret 56-bit keys and 8
parity bits. DES performs a series of bit permutations, substitutions, and recombination operations on blocks
of data. DES encryption does not affect the performance or throughput of the system.
•
AES (Advanced Encryption Standard): An over-the-air link encryption option that uses the Rijndael algorithm
and 128-bit keys and 256-bit key size to establish a higher level of security than DES. AES products are
certified as compliant with the Federal Information Processing Standards (FIPS 197) in the U.S.A.
The default setting on an AP is "Disabled".