Cisco 6861 Руководство по развертыванию - Страница 5

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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:

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Mainstream AP for home use

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Cisco Autonomous Access Points

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Minimum = 12.4(21a)JY

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Recommended = 12.4(25d)JA2, 15.2(4)JB6, 15.3(3)JD

The supported wireless LAN protocols include the following:

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802.11a, b, d, e, g, h, i, n

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Wi-Fi MultiMedia (WMM)

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Traffic Specification (TSPEC)

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Traffic Classification (TCLAS)

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.

Cisco IP Phone 6861 Multiplatform Phones Wireless LAN Deployment Guide