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Spectralink VIEW Certified Configuration Guide: Cisco Controllers and APs

`Known Limitations



Heavy multicast, broadcast or push-to-talk (PTT) traffic may impair voice quality on 7.0

versions.



Heavy ftp traffic may impair PTT traffic.



Fast Transition Roaming (802.11r) is not supported by the handsets



Multicast by VLAN is not compatible with the PTT feature in the handsets.



When using 7.0 versions, 5 GHz radio, 1142 AP's, and 80xx handsets, the use of

multiple antennas must be disabled on the AP's.



When using 1142 AP's, A-MPDU aggregation must be disabled for a WLAN containing

any 1142's if 11n is enabled on the network.



A-MSDU aggregation must be disabled if 11n is enabled on the AP.



In the controller software versions considered in this document, there is an issue related

to band steering that can cause slow roaming on the 2.4 GHz band in the 84-Series and

PIVOT handsets when both radios are active in the handset.



In the WMM/QoS mode, it is important to use the Static CAC Method rather than the

Load Based CAC Method.



DTPC (Dynamic Transmit Power Control) and the Auto setting on the 84-series are

recommended for best range performance. PIVOT uses Auto mode exclusively.



For best operation, the RRM/Tx Power Control (TPC) should be set to Fixed on On

Demand (during a low usage period) and the RRM/DCA Algorithm should be set to

Freeze or OFF. The White Paper: Best Practices Guide to Deploying Spectralink 84-

Series Handsets has more information about cell design. The handsets are not

incompatible with these features, but if used frequently, they will cause long roams and

asymmetric coverage regions that will result in choppy calls during caller movement.



The AP 3600 802.11ac snap-in module is not compatible with the Spectralinnk phones.

The AP 3600 without the module passed performance testing.



The F/T (fast transition roaming) adaptive mode where a WLAN can have a mix of

clients that support and don't support 802.11r worked well on the 2600, 2700, and 3700

models. It did not work well with the AP 3600. This feature was introduced in the 8.3

Cisco software chain.



ipv6 operation has not been tested.

Spectralink References

All Spectralink support documents are available at http://support.spectralink.com.

721-1001-000-AH.docx

December 2016