Cisco Mesh Access Points Deployment Manual page 98

Cell Planning and Distance
This section contains link budget analysis for AP to Client in the 2.4-GHz band. In this analysis, the focus is
on the system gain for upstream and downstream. Ideally, the link should be balanced for upstream and
downstream, but practically it may not happen. Therefore, the decision factor for the cell radius will be the
lowest of both upstream and downstream.
For AP to client link budget in 2.4 GHz, let us assume a client Tx power of 20 dB and an antenna gain of 0
dBi.
For -E domain, the EIRP limit is 20 dBm for the 2.4-GHz band and 30 dBm for the 5-GHz band.
Table 26: Outdoor 11n AP-to-Client, at 2.4 GHz: 9 Mbps Data Rate (-E domain)
Parameter
Tx Power Conducted
Tx Antenna Gain
Tx Beamforming (BF)
Tx EIRP
Rx Antenna Gain
Rx Sensitivity
System Gain
Range (AP to Client)
The AP to client link budget in the 2.4-GHz band on the -E domain is limited by downstream. Therefore,
downstream has a lower system gain. Thus, the decision factor will be downstream.
Cell sizes for AP to Client in 2.4 GHz for different AP1552 models can be decided by picking the lowest of
the following two:
• AP to Client distance in 2.4 GHz band (from
Data Rate (-E domain), on page
• Half of the distance between AP to AP on 5 GHz backhaul (from
5.6 GHz: 9 Mbps (-E domain), on page
Cisco Mesh Access Points, Design and Deployment Guide, Release 7.3
82
Cisco 1552 I/C Cisco 1552 E/H
DS US DS
15 dBm 20 dBm 13 dBm
(AP) (Client) (AP)
2 dBi 0 dBi 4 dBi
(AP) (Client) (AP)
3 dB 0 dB 3 dB
(AP) (Client) (AP)
20 dBm 20 dBm 20 dBm
0 dBi 2 dBi 0 dBi
(Client) (AP) (Client)
–91 dBm –94 dBm –91 dBm
(Client) (AP) (Client)
111 dB 116 dB 111 dB
173 meters 173 meters
(567 feet) (567 feet)
Table 26: Outdoor 11n AP-to-Client, at 2.4 GHz: 9 Mbps
82)
81)
Site Preparation and Planning
Comments
US
20 dBm Composite power at 9 Mbps,
20 MHz bandwidth
(Client)
0 dBi
(Client)
0 dB Legacy Rate ClientLink.
Helps only in DS.
(Client)
20 dBm
4 dBi
(AP)
–94 dBm Includes 4.7 dB MRC gain for
AP1552
(AP)
118 dB
LOS, PLE = 2.5 (5 dB fade
margin)
Table 25: AP to AP RF Link Budget,
OL-27593-01