User's Manual

ARCXTEND USER MANUAL – R1.4, ISSUE 4

PRE-DEPLOYMENT PLANNING

Hub Site Selection

A suitable location for the Hub is one that provides an acceptable line of sight (LOS) wireless link to

the CPE(s) located at the customer site(s). An acceptable wireless link is one within the working

range of Hub and with line of sight to the customer sites.

Line of Site

Line of sight is defined as a path between the Hub and CPE that is free of obstructions in the

Fresnel zone. Obstructions could be trees, buildings, street signs, etc. An accepted rule of thumb is

that LOS conditions exist when there are no physical obstructions within 60% of the Fresnel zone

(obstruction free zone). Obstructions can be trees, buildings, street signs, etc. The Fresnel Zone

clearance is determined by the distance between the Hub and CPE as shown in Figure 3-1.

Figure 3-1: Fresnel Zone Clearance Requirement

Range

The maximum range, assuming a clear Fresnel zone, is determined by the Hub type, downstream

modulation, and the mounting height of the Hub. The range, arc, and coverage area of all three

models of Hubs are given in Tables 3-1, 3-2, and 3-3.

Modulation Range Arc Area

Downstream Wireless Link

64 QAM (DS)

256 QAM (DS)

1 mile

0.25 miles

1.6 miles

0.4 miles

0.8 sq-miles

0.05 sq-miles

Upstream Wireless Link

CPE

Network

Hub

Fresnel Zone must

be clear of

obst ruct ions

obstructions

12 feet9 ft.6 ft.4 ft.3 ft.

2 miles1 mile½ mile1,000 ft. 500 ft.

CPE