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.
Ensure that the upstream signal from the phone meets the access point’s SNR for the transmitted data rate.
Packet Loss / Delay
Per voice guidelines, packet loss should not exceed 1%. Otherwise, the voice quality can be degraded significantly.
Jitter should be kept at the minimal (< 100 ms).
Retries
802.11 retransmission should be less than 20%.
Multipath
Multipath should be kept to the minimal to create nulls and reduce signal levels.
Number of allowed devices
The total number of connected devices to a given AP is no more than 10.
Separate SSID
We recommend that you put the phone in a separate SSID to guarantee voice traffic on the phone. Sharing the same
SSID with other devices may impact phone calls on the phone when the other devices are using heavy network traffic.
For voice deployments, it is suggested to use 802.11a/n for voice and use 802.11b/g/n for data.
Wireless LAN
The Cisco IP Phone 6861 Multiplatform Phones are recommended to work with the following Wireless LAN solutions:
• Mainstream AP for home use
• Cisco Autonomous Access Points
▪ Minimum = 12.4(21a)JY
▪ Recommended = 12.4(25d)JA2, 15.2(4)JB6, 15.3(3)JD
Protocols
The supported wireless LAN protocols include the following:
• 802.11a, b, d, e, g, h, i, n
• Wi-Fi MultiMedia (WMM)
• Traffic Specification (TSPEC)
• Traffic Classification (TCLAS)
Regulatory
World Mode (802.11d) allows a client to be used in different regions, where the client can adapt to use the channels and
transmit powers advertised by the access point in the local environment.
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