Power Management
The Cisco Unified IP Phone 9971 primarily is in active mode, so the radio will always be on.
However, power save protocols such as U-APSD or PS-POLL can be utilized for off-channel scanning or when using
Coexistence (802.11b/g + Bluetooth).
An AC adapter is required to use the 9971 in wireless LAN mode.
Wireless LAN is automatically disabled temporarily when Ethernet is connected, but will be automatically re-enabled once
Ethernet is disconnected if Wireless LAN was enabled previously.
Delivery Traffic Indicator Message (DTIM)
It is recommended to set the DTIM period to 2 with a beacon period of 100 ms.
Broadcast and multicast traffic will be queued until the DTIM period when there are power save enabled clients associated to
the access point, so DTIM will determine how quickly these packets can be delivered to the client. If using multicast
applications, a shorter DTIM period can be used.
If multiple multicast streams exist on the wireless LAN frequently, then it is recommended to set the DTIM period to 1.
Quality of Service (QoS)
Quality of Service enables queuing to ensure high priority for voice and video traffic.
To enable proper queuing for voice, interactive video, and call control traffic use the following guidelines.
• Ensure that WMM is enabled on the access point.
• Create a QoS policy on the access point giving priority to voice, interactive video, and call control traffic.
• Be sure that voice, interactive video, and call control packets have the proper QoS markings and other protocols are not
using the same QoS markings.
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