An engineer has performed a predictive site survey for high-speed data and voice in an indoor office. What is the recommended data rate with -67 dBm signal level for optimal VoWLAN design?
A. 6 Mbps on 802.11 bgn
B. 24 Mbps on 802.11 bgn
C. 12 Mbps on 802.11 an
D. 24 Mbps on 802.11 an
https://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob30dg/Voice.pdf
Page: 13
From above link, no 12 Mbps data rates was mentioned regarding -67 dBm signal level for optimal VoWLAN design.
11 Mbps was mentioned for 2.4Ghz & 24 Mbps for 5Ghz 802.11a.
The answer is D based on above link.
I would go for C. 12 Mbps on 802.11 an
1. As you plan the band and channel assignment for each AP, try
to leverage the 5GHz band as much as possible. There are
more non-overlapping channels there and much less chance of
interference from non-Wi-Fi devices. A common practice is to
use the U-NII-1 and U-NII-3 channels, while avoiding U-NII-
2 and U-NII-2 Extended channels because of DFS
requirements. If a radar signal is detected by an AP using a
DFS channel, the AP and its clients must abandon the channel
and move elsewhere. Such an event is very disruptive to voice
and video sessions. You should consider using the DFS
channels only if there is no detectable radar activity.
2. For voice or real-time application support, 12Mbps is common, and 24Mbps is expected if
real-time video applications (for example, video conferencing) are your
target (under Official Cert Guide)
I don’t understand that the recommended data rate is on bgn. 2.4GHz are not recommended, it should be answers C or D. And I think 12 Mbps is the minimum recommended for voice, so… I think it’s C