Client Access Certified Antennas (Third-Party Antennas)
You can use third-party antennas with AP1500s. However, note the following:
• Cisco does not track or maintain information about the quality, performance, or reliability of the
noncertified antennas and cables.
• RF connectivity and compliance is the customer’s responsibility.
• Compliance is only guaranteed with Cisco antennas or antennas that are of the same design and gain as
Cisco antennas.
• Cisco Technical Assistance Center (TAC) has no training or customer history with regard to nonCisco
antennas and cables.
Maximum Ratio Combining
To understand how this works, consider a single transmitter 802.11a/g client sending an uplink packet to an
802.11n access point with multiple transceivers. The access point receives the signal on each of its three
receive antennas.
Each received signal has a different phase and amplitude based on the characteristics of the space between
the antenna and the client. The access point processes the three received signals into one reinforced signal by
adjusting their phases and amplitudes to form the best possible signal. The algorithm used, called maximum
ratio combining (MRC), is typically used on all 802.11n access points. MRC only helps in the uplink direction,
enabling the access point to "hear" the client better.
Figure 17: Reinforcement of Received Signal via MRC Algorithm
Cisco Mesh Access Points, Design and Deployment Guide, Release 7.3
34 OL-27593-01
Mesh Network Components
Cisco Outdoor Mesh Access Points
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