Special Considerations For Indoor Mesh Networks - Cisco Mesh Access Points Deployment Manual

Site Preparation and Planning
You must follow antenna proximity requirements, which depend upon the adjacent and alternate adjacent
channel usage.
Collocating AP1500s on Adjacent Channels
If two collocated AP1500s operate on adjacent channels such as channel 149 (5745 MHz) and channel 152
(5765 MHz), the minimum vertical separation between the two AP1500s is 40 feet (12.192 meters) (the
requirement applies for mesh access points equipped with either 8 dBi omnidirectional or 17 dBi high-gain
directional patch antennas).
If two collocated AP1500s operate on channels 1, 6, or 11 (2412 to 2437 MHz) with a 5.5-dBi omnidirectional
antenna, then the minimum vertical separation is 8 feet (2.438 meters).
Collocating AP1500s on Alternate Adjacent Channels
If two collocated AP1500s operate on alternate adjacent channels such as channel 149 (5745 MHz) and channel
157 (5785 MHz), the minimum vertical separation between the two AP1500s is 10 feet (3.048 meters) (the
requirements applies for mesh access points equipped with either 8-dBi omnidirectional or 17-dBi high-gain
directional patch antennas).
If two collocated AP1500s operate on alternate adjacent channels 1 and 11 (2412 MHz and 2462 MHz) with
a 5.5-dBi omnidirectional antenna, then the minimum vertical separation is 2 feet (0.609 meters).
In summary, a 5-GHz antenna isolation determines mesh access point spacing requirements and antenna
proximity must be followed and is dependent upon the adjacent and alternate adjacent channel usage.

Special Considerations for Indoor Mesh Networks

Note these considerations for indoor mesh networks:
• For outdoors, voice is supported on a best-effort basis on a mesh infrastructure.
• Quality of Service (QoS) is supported on the local 2.4-GHz client access radio and on the 5-GHz and
4.9-GHz backhauls.
• Cisco also supports static Call Admission Control (CAC) in CCXv4 clients, which provides CAC between
the access point and the client.
• RAP-to-MAP ratio—The recommended ratio is 3 to 4 MAPs per RAP.
• AP-to-AP distance:
• Hop count—For data, the maximum is 4 hops. No more than 2 hops is recommended for voice.
• RF considerations for client access on voice networks:
OL-27593-01
◦ For non-11n mesh APs (1130 and 1240), a spacing of no more than of 200 feet (60.96 meters)
between each mesh access point is recommended with a cell radius of 100 feet (30.48 meters).
◦ For 11n mesh APs(1040, 1140, 1250, 1260, 3500e and 3500i), a spacing of no more than 250 feet
between each mesh AP with a cell radius of 125 feet is recommended.
◦ Coverage hole of 2 to 10 percent
◦ Cell coverage overlap of 15 to 20 percent
◦ Voice needs RSSI and SNR values that are at least 15 dB higher than data requirements
Cisco Mesh Access Points, Design and Deployment Guide, Release 7.3
Cell Planning and Distance
87