User guide

Managing Your Canopy Network March 2005
Through Software Release 6.1
Issue 1 Page 345 of 425
Canopy System User Guide
26.6.3 Bridge Table Page (All)
An example of the Bridge Table screen is displayed in Figure 125.
Figure 125: Bridge Table screen
If NAT (network address translation) is not active on the SM, then the Bridge Table web
page provides the MAC address of all devices that are attached to registered SMs
(identified by LUIDs). The bridging table allows the AP to send data to the correct SM.
26.6.4 Frame Calculator Page
Canopy avoids self-interference by syncing collocated APs (so they begin each
transmission cycle at the same time) and requiring that collocated APs have the same
transmit/receive ratio (so they stop transmitting and start receiving at the same time).
This ensures that, at any instant, they are either all receiving or all transmitting.
This avoids, for example, the problem of one AP attempting to receive from a distant SM,
while a nearby AP is transmitting and overpowering the signal from the distant SM.
Parameters that affect transmit/receive ratio include range, slots, downlink data
percentage, and high priority uplink percentage. In releases earlier than 6.1, Canopy
ensured that APs in a cluster had the same transmit/receive ratio by requiring that all
these parameters be set the same. Release 6.1, introduces a new frame structure for
hardware scheduler than for software scheduler, but the rule remains: to have all
collocated APs have the same transmit/receive ratio. Additional engineering is needed for
setting the parameters in a mixed cluster – one running APs on both hardware and
software schedulers.
Release 6.1 and later includes a frame calculator to help do this. The operator inputs
various AP settings into the calculator, and the calculator outputs many details on the
frame including the Uplink Rec SQ Start. This calculation should be done for each AP
that has different settings. Then the operator varies the Downlink Data percentage in
each calculation until the calculated Uplink Rec SQ Start for all collocated APs is within
300 time bits. The frame calculator is available on any module running Release 6.1 or