Specifications

DRM Power Control Summary
Summit WM20 Technical Reference Guide, Software Version 4.2 93
It is important to make sure that the APs configured for this mode are operating on the same plane as
the clients. The APs are adjusting power to avoid interfering with each other and are not taking into
account the location of clients. If the APs are mounted on high ceilings (For Example: 50 feet above an
exhibit hall floor) and the APs reduce power to avoid interfering with other APs, the coverage on the
exhibit hall floor may be severely impacted.
The trade-off for using Shaped Power Control vs Standard Power Control is whether increasing the
transmit power for data frames to support distant clients will impact the performance of neighboring
APs operating on the same channel. How well Shaped Power Control will work depends on the type of
client. Experience has found that for most situations, Standard Power Control provides the best service
to clients, particularly WiFi phones.
DRM Power Control Summary
● DRM Standard Power Control transmits management frames a full power creating a full size cell
that clients use to analyze the environment.
● This provides a consistent view of the RF environments to all clients
● Clients can make accurate association decisions
● Clients will know exactly when they should roam to a new AP
● DRM Standard Power Control Reduces the Transmit power of Data frames if there are other APs
present in the environment operating on the same channel.
● Reducing the transmit power of data frames minimizes co-channel interference
● And increases the ability to reuse channels
● DRM Standard Power Control Continuously monitors this situation and will raise power if the other
AP is removed from service, changes channel, or fails
● DRM provides the best possible service to a changing RF environment
● DRM will lower power if a new AP is brought online on the same channel in its environment.
● When clients associate, DRM Standard Power raises the transmit power of data frames to the
maximum, monitors the position of the client, and then adjusts the transmit power to provide the
best possible service.
● When client movement is detected, DRM Standard Power Control will increase data frames to full
power, reevaluate the position of the client, and adjust power again to best service the client.
● DRM Continuously monitors and adjusts the transmit power for data frames to accommodate a very
dynamic RF environment.
● The results of DRM RF Power Management are
● Minimized interference
● Maximum performance for clients
● Maximized ability to reuse channels
● Overall better system performance
● DRM Shaped Power Control reduces the transmit power of all 802.11 frames including management
frames
● This shrinks the entire cell minimizing interference with other APs
● DRM Shaped Power Control does not adjust power to support distant clients
● Once the Cell size is established, client associations do not affect it