User's Manual Part 1
Release8OverviewofCycloneNetworks
Issue2,November2007 Draft5forRegulatoryReview 82
See Address Resolution Protocol on Page 162.
7.1.3 DefaultFrameStructures
With a 64-byte slot size, the default Cyclone frame in hardware scheduling consists of
• variable numbers of uplink and downlink data slots, subject to the following
factors:
• Maximum range decreases the number of available slots to 32.
• Background bit error rate (BER) mode decreases the number of available
data slots by one (and bandwidth by 200 kbps).
• Every two control slots that are allocated decrease the number of available
data slots by one.
• 0 to 10 control slots, subject to operator setting
• 0 to 9 downlink acknowledgement slots, dynamically assigned
• 0 to 9 uplink acknowledgement slots, dynamically assigned
• 1 uplink schedule slot
• 1 beacon slot, which identifies the
• timing and distribution for the SMs
• ratio of uplink to downlink allocation
• ESN of the AP
• color code
• protocol (point-to-point or point-to-multipoint)
• number of registered SMs
• frame number
• control slot information
◦ air delay, subject to the value of the Max Range parameter in the AP
Control Slots
The Radio tab of the Configuration web page in the AP displays the total of control slots
(default 3, maximum 7 in the 900-MHz frequency band range
2
and 16 in all others).
These control slots are contention slots. If too many SMs contend for these slots, then
the number of control slots may be increased.
Frame Scheduling
When an SM boots, the following sequence occurs:
1. The SM finds this beacon slot from an AP.
2. The SM synchronizes with the AP.
3. If BAM is configured on the AP and the AP is licensed for authentication, then
a. the AP sends a Registration Request message to Prizm for authentication.
b. following a successful challenge, Prizm returns an Authentication Grant
message to the AP.
2
In the 900-MHz frequency band range, the frame size is 16,667 bits. In all others, the frame size
is 25,000 bits. The smaller frame does not provide enough space to allocate more than 7 control
slots.