A. The behavior depends on the configuration of the AP. If CCKM is NOT
configured/supported on the client, the client does not associate with an AP that is set to
CCKM "mandatory." If the infrastructure (AP) is set to CCKM "optional," the client does
associate and does its non−CCKM handshake.
Dependent upon the clients deployed, it is typically recommended to set CCKM to "optional"
on infrastructure that permits the association of all devices but supports fast roaming ONLY
for capable/CCKM−associated devices.
Q. What is the difference in memory capacity between AP 1240 and
1230?
A. These are the memory capacities of the AP 1240 and 1230:
AP 1240 is a 32−MB platform AP.♦
AP 1230 is a 16−MB platform AP.♦
Q. I have two AP 1240s that support link role flexibility. I would like to
bridge between them with 802.11a, with clients joined on the 802.11b/g
bands. Are there any restrictions to do this?
A. Access point link role flexibility provides bridge mode functionality support for access
points that have dual−band capability (1200, 1230, and 1240AG Series). In the target
configuration, the 802.11a radio runs in bridge mode, while the 802.11g radio is in the access
point mode.
The requirement is that when you configure an AP with link role flexibility, one of the radios
of the AP must be configured as a root AP, and the second AP that bridges back must be in
repeater or WGB mode to the root AP.
Q. How many wireless IP telephony handsets are recommended per AP?
A. IP telephony network sizing is essential to ensure that adequate bandwidth and resources
are available to carry mission−critical voice traffic. In addition to the usual IP telephony
design guidelines for sizing components, such as PSTN gateway ports, transcoders, WAN
bandwidth, and so forth, also consider these 802.11b issues when sizing your wireless IP
telephony network:
Number of 802.11b devices per AP: Cisco recommends that you have no more than
15 to 25.
♦
Number of 802.11b phones per AP♦
Before any discussion about network plans can take place, it helps to understand the basics of
the overall network capacity. These network capacity guidelines apply to sizing the Wireless
IP Telephony network:
No more than seven concurrent G.711 calls per AP♦
No more than eight concurrent G.729 calls per AP♦
Note: These design recommendations assume that Voice Activity Detection (VAD) has been
disabled on the Cisco 7920 Wireless IP Phones.
Use of VAD on the Cisco 7920 phones can conserve bandwidth, but Cisco recommends that
you disable VAD on all Cisco CallManager servers to provide better overall voice quality. In
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