User's Manual

ARCXTEND 5.8 GHZ USER MANUAL – R1.0, ISSUE 1
Copyright 2005 Arcwave, Inc. 15
Table 3-2: AX1455-SM-25 Strand Mounted Network Hub (18 ft off the ground)
Modulation Range Arc Area
Downstream Wireless Link
64 QAM (DS)
256 QAM (DS)
2 miles
½ mile
3.1 miles
0.8 miles
3.14 sq-miles
0.19 sq-miles
Equipment Location
A simple method for choosing the location of the Hub uses a map
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of the area to be covered.
Draw two circles taking the customer site(s) to be covered as its center and the maximum range
of each Hub type as the circle’s radius. .
Once you have identified possible sites for the Hub, drive out to these locations and determine
which, if any of them, provide a line of site path to the customer site(s) to be served. The
simplest way to do this is, using a spotting scope, find the other end of the path and determine if
it meets the Fresnel zone criteria. A more accurate approach would be to use a range finder to
measure the height of the highest obstruction in the path and GPS to measure the distance. If
you find that none of the Hub sites will work then you need to go back to the map and try and
locate alternative locations.
Checking for Upstream Interference
ARCXtend maps the upstream DOCSIS channel to a frequency between 5,725 MHz and 5,742
MHz. As shown in Table 3-3 the mapping is fixed and based solely on the frequency of the
upstream DOCSIS channel.
Upstream DOCSIS
Channel
Upstream Wireless
Channel
Upstream DOCSIS
Channel
Upstream Wireless
Channel
center (MHz) center (MHz) center (MHz) center (MHz)
10.2 5730.2 29.4 5749.4
13.4 5733.4 32.6 5752.6
16.6 5736.6 35.8 5755.8
19.8 5739.8 39.0 5759.0
23.0 5743.0 42.2 5762.2
26.2 5746.2
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A network map with street and building information is ideal for this activity.