User's Manual

PN 8100-40 LGCell 4.0 Installation, Operation, and Reference Manual 3-1
620004-0 Rev. B
SECTION 3 LGCell Main Hub
The Main Hub is the LGCell’s central distribution point. On the dowlink, it receives
RF signals from a base station or a repeater and converts them to optical signals,
which it distributes to Expansion Hubs. On the uplink, the Main Hub receives optical
signals from the Expansion Hubs and converts them back to RF signals to be relayed
to a base station or a repeater.
Figure 3-1 The Main Hub in an LGCell 1-1-1 Configuration*
LGCell Main Hub Features
• Mounts in a standard 19 in. (483 mm) equipment rack
• Connects to a base station or repeater using coaxial cable
• Supports up to four Expansion Hubs using standard 62.5µm/125µm multimode
fiber (MMF) cable
• Displays system status with front panel LEDs
• Provides contact closures and error latches for major errors through a D-sub
9-pin connector on the rear panel
RAU
Multimode Fiber
between Main Hub
and Expansion Hub
Cat-5 UTP/STP
between Expansion Hub and RAU
Main Hub and
Base Station or
Coaxial Cable between
Coaxial Cable between
AC POWER
LGCell
TM
Main Hub
SYNC
POWER
LINK
SYNC
STATUS
DOWN
UP
1
LINK
SYNC
STATUS
DOWN
UP
2
LINK
SYNC
STATUS
DOWN
UP
3
LINK
SYNC
STATUS
DOWN
UP
4
TO EXPANSION HUB PORTS
AC POWER
LGCell
TM
Expansion Hub
SYNC
POWER
SYNC
LINK
STATUS
ANTENNA PORTS
DOWN
UP
MAIN HUB PORT
Repeater
RAU and Passive Antenna
*1-1-1 configuration = 1 Main Hub, 1 Expansion Hub, and 1 Remote Access Unit