User's Manual

InfiNet Wireless R5000 Technical User Manual
Copyright © 2004-2006 by InfiNet Wireless Limited.
35
• Bottom value for the speed: 12 Mbps
• This solution provides with the performance of not less than 8
Mbps of real throughput for upstream traffic and 14 Mbps for
downstream traffic with maximal coverage area
Frequency planning for multi-sectored Base Stations
Base Stations with six sectors deliver the maximal performance by providing with
sector reciprocal reservation and best price/performance parameter value. When
having an optimal frequency gap of 40 MHz between adjacent sectors of the BS,
the following schemes are recommended to be configured (e.g. having 5
available in configuration frequencies F1, F2 … F5):
• F1, F3, F5, F1, F3, F5
• F1, F3, F1, F3, F1, F3
Transmitting power selection
High output power provides with a maximal connection performance. Power
decreasing is logical when the maximal speed is already reached and there are
no repeats. In this case an excessive output power can decrease the system
parameters. When having no built-in or external amplifiers one can try to install
the automatic power control for the subscriber.
Fade margin calculator
Fade Margin Calculator is used for estimating the link energetic parameters and
for upstream/downstream speeds prognosis. The calculator is available at
www.infinetwireless.com web-site in the Support section.
The procedure for the Calculator usage is the following:
1. Specify “Distance” and “Frequency” parameters of the link
2. Specify “Antenna Gain” for Unit №1 and for Unit №2
3. Specify “Cable Attenuation” per 1 meter cable length. For example, for 2.4
GHz devices - 0.24 dB, for 5 GHz – 0.4 dB. Depends upon used cables.
4. Specify “Output power” in milliwatts
5. Specify “Receiver sensitivity”. In order to do that, please think of the
desired/predicted speed on the link and refer to the tables below the
Calculator. For Unit №1 – predict UPSTREAM speed. For Unit №2 – predict
DOWNSTREAM speed
6. If you use external amplifiers, fill out “Amplifier” section(s)
7. Press “Recalculate” button
8. Perform the following actions:
• For UPSTREAM speed prognosis use “Signal level by InfiNet scale”
parameter for Unit №1. Subtract “Sinking Offset” parameter
provided below. Search the calculated value in “Minimal InfiNet scale
level required for maximal throughput” in the tables below. If the
value matches with the predicted speed, the link works with selected
parameters. If not, please select another speed and go back to Step
6
• For DOWNSTREAM speed prognosis use “Signal level by InfiNet
scale” parameter for Unit №2. Subtract “Sinking Offset” parameter
provided below. Search the calculated value in “Minimal InfiNet scale
level required for maximal throughput” in the tables below. If the
value matches with the predicted speed, the link works with selected