User's Manual

EMS Wireless Operator’s Manual
EkoLink Plus Fiber Optic DAS
32
5.2 Hub Unit
A block diagram of the hub unit is shown in Figure 12.
5.2.1 Hub Interface Module
The Hub Interface Module provides the RF interface control for the uplink path, control
of the optical lasers for signaling the remote status, interface to the controller module
and wireline modem, and relays for alarm and control status. In addition, the primary
power conversion is done in the hub interface module to provide all of the required
voltages from an input supply voltage of 24 VDC.
5.2.2 Fiber Optic Transceiver
The Fiber Optic Transceiver modulates or demodulates the RF signal to the optical
signal and provide interconnection to the optical fiber. The control module transmits
alarms and control information to the remote repeater unit by pulsing or turning off the
laser. This, in turn, is received at the remote repeater detector which provides the
desired alarm and or control command. The Hub can be equipped with up to four fiber
optic transceivers to support four remotes or two remotes with diversity receive.
5.2.3 Hub Control Module
The Hub control module enables monitoring and control of the hub and repeater. This
module determines the status of the hub and repeater and identifies failure conditions.
When an alarm occurs, the module can send a message to a PC over a serial data
link. The PC connection is through an RS232 serial interface to a laptop computer
equipped with Windows HyperTerminal or a similar terminal emulation program. Also,
the status and control module sends and receives channel and amplification data to a
remote location when connected to a wireline or wireless modem.
Monitoring and control is possible through the MirrorCell Unit Manager (MUM) using a
wireless or wired modem connection. The MUM is not accessible with a direct hard-line
(local) connection to the status and control module.
5.2.4 Hub Power Supply Module (Optional)
The 115/230 VAC power supply module provides an output nominal voltage of 24VDC
to the hub interface module when battery back up is not required.