Wireless LANs transmit unicast, broadcast, and multicast frames. Multicast throughput can be impacted by both basic rate set and power-save mode.
Basic Rate: APs beacon a bit mask identifying the set of basic rates they can support. To associate with that AP, stations must support one of those rates. According to the 802.11 standard, all broadcast and multicast frames must be transmitted at a basic rate that is supported by all stations currently associated to the WLAN. You may see 1 or 2 Mbps being used as the basic rate in a mixed b/g WLAN.
Power Save: If any associated station is using power-save mode, the AP must buffer multicast frames and send them immediately following the next Delivery Traffic Indication Message (DTIM). To learn more about multicast throughput and power-save mode, read this article by Jim Geier.
Dig Deeper on Wireless LAN (WLAN)
Related Q&A from Lisa Phifer
Is there a difference between a wireless access point vs. a router? Yes -- while the two wireless devices are related, they meet different needs in a... Continue Reading
Learn the differences between site-to-site VPNs vs. remote-access VPNs and find out about the protocols, benefits and the data security methods used ... Continue Reading
Need to send an email, check your flight's status or get ready for a presentation? You can do it all on your smartwatch, thanks to a slew of Apple ... Continue Reading