User's Manual

PN 8100-40 Help Hot Line (U.S. only): 1-800-530-9960 2-5
620004-0 Rev. B
System Operation
2.2 System Operation
Downlink (Base Station/Repeater to Wireless Handsets)
• The LGCell system’s Main Hub is usually installed in a 19 in. (483 mm) equip-
ment rack in a wiring closet or equipment room inside the facility where coverage
will be provided. Coaxial cable is used to connect the Main Hub to a local base sta-
tion or to a repeater that is attached to a roof-top antenna. The Main Hub receives
the incoming RF signals and splits them to feed four internal fiber optic transceiv-
ers that convert the RF signals to optical signals. The Main Hub transmits the opti-
cal signals over multimode fiber to up to four Expansion Hubs, which are usually
installed in other telecom closets throughout the facility.
WARNING: Exceeding the maximum input power could cause failure
of the Main Hub (refer to Section 7.1 on page 7-3 for maximum power
ratings). Attenuators may be required to limit the maximum composite
power into the Main Hub.
•The Expansion Hub converts the optical signals back to electrical signals, which
are then transmitted to up to four Remote Access Units (RAUs) over Cat-5
UTP/STP cabling.
•The Remote Access Unit receives the electrical signals from the Expansion Hub
and transports the signals over a short coaxial cable to an attached passive antenna,
which then transmits the RF signals to wireless handsets.
Uplink (Wireless Handsets to Base Station)
• The passive antenna relays the RF signals from wireless handsets to the Remote
Access Unit, which then transmits the signals to the Expansion Hub over Cat-5
UTP/STP cabling.
•The Expansion Hub converts the electrical signals to optical signals and transmits
the signals to the Main Hub over MMF.
•The Main Hub converts the optical signals to the proper frequency band RF sig-
nals and sends them to a local base station or to a repeater that is connected to a
roof-top antenna.