Also need to ensure that the upstream signal from the Cisco IP Phone 8800 Series meets the access point’s receiver
sensitivity for the transmitted data rate. Rule of thumb is to ensure that the received signal at the access point is -67
dBm or higher.
It is recommended to design the cell size to ensure that the Cisco IP Phone 8800 Series can hold a signal for at least 5
seconds.
Channel Utilization
Channel Utilization levels should be kept under 40%.
The Cisco IP Phone 8800 Series converts the 0-255 scale value to a percentage, so 105 would equate to around 40% in
the Cisco IP Phone 8800 Series current access point menu.
Noise
Noise levels should not exceed -92 dBm, which allows for a Signal to Noise Ratio (SNR) of 25 dB where a -67 dBm
signal should be maintained.
Also need to ensure that the upstream signal from the Cisco IP Phone 8800 Series meets the access point’s signal to
noise ratio for the transmitted data rate.
Packet Loss / Delay
Per voice guidelines, packet loss should not exceed 1% packet loss; otherwise voice quality can be degraded
significantly.
Jitter should be kept at a minimal (< 100 ms).
Retries
802.11 retransmissions should be less than 20%.
Multipath
Multipath should be kept to a minimal as this can create nulls and reduce signal levels.
Many different tools and applications can be used to evaluate these items in order to certify the deployment.
• Cisco Prime Network Control System (NCS) for Unified Wireless LAN Management
http://www.cisco.com/c/en/us/products/collateral/wireless/prime-network-control-system-series-
appliances/data_sheet_c78-650051.html
• Cisco Wireless Control System (WCS) for Unified Wireless LAN Management
http://www.cisco.com/c/en/us/products/collateral/wireless/wireless-control-
system/product_data_sheet0900aecd802570d0.html
• Cisco Wireless LAN Solution Engine (WLSE) for Cisco Autonomous Wireless LAN Management
http://www.cisco.com/c/en/us/products/collateral/cloud-systems-management/ciscoworks-wireless-lan-solution-engine-
software-2-13/product_data_sheet0900aecd80410b92.html
• Cisco Spectrum Expert
http://www.cisco.com/c/en/us/products/collateral/wireless/spectrum-expert/product_data_sheet0900aecd807033c3.html
• Cisco Unified Operations Manager
http://www.cisco.com/c/en/us/products/collateral/cloud-systems-management/prime-unified-operations-
manager/data_sheet_c78-636705.html
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