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InterReach Unison Installation, Operation, and Reference Manual
CONFIDENTIAL
D-620003-0-20 Rev J
• If possible, determine the building’s construction materials (sheetrock, metal,
concrete, and so on.)
• Determine type of environment
– Open layout (for example, a convention center)
– Dense, close walls (for example, a hospital)
– Mixed use (for example, an office building with hard wall offices and cubi-
cles)
4.
Develop an RF link budget: refer to Section 6.4, “Link Budget Analysis,” on
page 6-24.
Knowing the power per carrier, you can calculate an RF link budget. This is used
to predict how much propagation loss can be allowed in the system, while still
providing satisfactory performance throughout the area being covered. The link
budget is a methodical way to derive a “design goal”. If the design goal is pro-
vided in advance, the link budget is:
allowable RF loss = maximum power per
carrier – design goal.
5.
Determine the appropriate estimated path loss slope that corresponds to the
type of building and its layout, and estimate the coverage distance for each
RAU: refer to Section 6.2, “Estimating RF Coverage,” on page 6-12.
The path loss slope (PLS), which gives a value to the RF propagation characteris-
tics within the building, is used to convert the RF link budget into an estimate of
the coverage distance per antenna. This helps establish the Unison equipment
quantities needed. The actual path loss slope that corresponds to the specific RF
environment inside the building can also be determined empirically by perform-
ing an RF site-survey of the building. This involves transmitting a calibrated tone
for a fixed antenna and making measurements with a mobile antenna throughout
the area surrounding the transmitter.
6.
Determine the items required to connect to the base station: refer to
Section 6.6, “Connecting a Main Hub to a Base Station,” on page 6-37.
Once you know the quantities of Unison equipment you will use, you can deter-
mine the accessories (combiners/dividers, surge suppressors, repeaters, attenua-
tors, circulators, and so on.) required to connect the system to the base station.
The individual elements that must be considered in designing a Unison solution are
explained in the following sections.
NOTE:
Access the LGC Wireless portal at LGCWireless.com for on-line
dimensioning and design tools.
