User's Manual

ARCXTEND 5.8 GHZ USER MANUAL – R1.0, ISSUE 1

Table 3-3: Upstream Channel Mapping

The upstream wireless channel is centered at 5,720 MHz plus the upstream DOCSIS channel

frequency: e.g. Upstream Channel 29.5 MHz is transmitted at 5,749.5 MHz.

As part of the site selection process check for interference at the wireless frequency carrying the

DOCSIS upstream channel. If interference is present you will need to use a different DOCSIS

upstream channel, if possible, or move the Hub to a different location. .

Handheld wireless LAN spectrum analyzers covering the 5.250 to 5.350 range and capable of

identifying signals regardless of origin, like the BANTAM INSTRUMENTS Model 425A, are ideal

for locating potential interference.

CPE Site Selection

Height and Location

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

link, as previously defined, to the Hub. This requires the CPE to be placed high enough on the

rooftop to provide the required Fresnel zone clearance. Using the setup shown in Figure 3-2,

the optimal height and location can be determined by monitoring the Signal Level reading on the

AR100 Signal Strength Meter. Monitoring the Signal Level meter on the AR100, the optimal

CPE height and location will be indicated by maximum signal level readings.

The CPE should be located to the edge of the building closet to the Hub. If the CPE were to be

mounted towards the middle or back of the building, the incoming wireless signal can be

reflected by the rooftop impairing the performance of the link. It is also advisable to select a

location near to the rooftop grounding system to have a short, low resistance path and within

300 feet of an AC power source. The routing path for the coaxial cable that connects the CPE to

the cable modem is also worked following your normal guidelines.

Figure 3-2: CPE Site Survey Setup

Telescoping

Mast

CPE

LNB

CPE Wall

Mount Adaptor

AR100

Signal

Strength

Meter

Power

Inserter

Spectrum

Analyzer

RF Power To

RF TO

Power in