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Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
3-5
0.25"
Single Mode
Fiber (9/125)
Single Mode
Fiber (9/125)
18 AWG
Insulated
Copper (Red)
18 AWG
Insulated
Copper (Black)
Plenum Rated
Outer Jacket
(Yellow)
0.50"
Aramid Yarn
Strength Member
Figure 3-2. Cross Section of Andrew Composite Fiber/Copper Cable
Single Mode Fiber Optic Cable
Single mode fiber optic cable is used in the InCell™ products because of its wide bandwidth and
loss attenuation characteristics. Single mode fiber optic cable has the lowest attenuation of all
fiber optic cable types and is typically lower in cost than multimode fiber cable. Single mode
fiber is used in communications systems where high data rates and wide bandwidths are
required. Wideband fiber optic line provides for unlimited future growth. Typical single mode
cable loss is 0.4 dB per km. The loss of two SC/APC connectors is typically 0.5 dB.
Enhanced Remote Antenna Unit Power Distribution
Typically, all ERAUs will be remotely powered over the composite cable. To support distances of
greater than 1000’ between the CDU and the ERAU, the ERAU may be locally powered using DC
power supplied by a wall transformer that provides 40 to 60 VDC to the ERAU. The 1000’ limit is a
function of the voltage drop across the copper wires and is typically not a problem for in-building
wireless system designs. Using local power at each ERAU, the InCell™ System may be used in
campus and large buildings installations with almost unlimited distance between the CDU and each
ERAU.
Alternative System Cabling Methods
Andrew has designed the InCell™ System to be very flexible to meet the most customer installation
requirements. The ERAU has been designed to accept DC power through the composite cable or
from a local wall transformer. Figure 2 shows the two DC power connectors on the ERAU. The
power connector on the left accepts the DC and Ground signals from the composite cable. The
connector on the right accepts DC and Ground from a wall transformer. The transformer must
provide 40 to 60 VDC.