User's Manual

SPEEDLAN 8500 Series Installation and Operation User Guide
Configuring SPEEDLAN 5-9
• SectorPRC Mode (No Base Station/IDU)
This method of transportation is used only for point-to-point links. If any of the IDUs are
unable to see each other, a base station must be used to repeat traffic from one IDU to next
IDU in line. This point-to-point mode utilizes SectorPRC packet bundling, which reduces the
amount of overhead caused by sending smaller individual packets across the wireless
network. This greatly improves the performance of the connection.
• SectorPRC Mode (This is a Non-Polling Base Station/IDU)
This setting should be used if this is the only base station in the wireless network cell.
SPEEDLAN has a special mode where one wireless IDU can be configured as a base station
and each additional wireless node is setup as a CPE IDU. In this configuration the only
requirement is that each SPEEDLAN CPE be able to communicate directly with the
SPEEDLAN base station. The SPEEDLAN base station is responsible for repeating packets
that need to travel between the SPEEDLAN CPE. The Non-Polling Base does not allocate
dynamically bandwidth to each remote IDU.
The performance of this approach is greatly improved if the SPEEDLAN base station is connected to
the heaviest network or network server.
• SectorPRC Mode (This is a Polling Base Station/IDU)
This is the recommended mode of operation for a wireless base station. When the number
of CPE exceed 3 or 4, the non-polling base station may not be able to keep up with the
wireless traffic that needs to be forwarded. The polling base station alleviates this problem
by continuously communicating with every SPEEDLAN CPE in its cell. It is also responsible
for dynamically assigning how much bandwidth is allocated to each remote site based on
the network traffic load.
This greatly improves the performance of a SPEEDLAN base station wireless network cell. As the
number of SPEEDLAN CPE IDUs increase, the importance of a polling base station increases and
efficiency is proportionately improved.
• SectorPRC (This is a Remote Station/IDU)
This is the configuration required for remote IDUs that will be installed as CPE into a multi-
point wireless network (SPEEDLAN CPE). In this mode, a SPEEDLAN CPE will only communi-
cate with a base station. This mode cannot be used for point-to-point links.
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