User's Manual

EMS Wireless Operator’s Manual

EkoLink Plus Fiber Optic DAS

5.1.4 Duplex Filter

The transmit and receive RF signals are combined with duplex filters operating in the

desired frequency band. The filter consists of comb-line cavity bandpass filters, which

provide excellent isolation against out-of-band signals.

5.1.5 Status and Control Module

The status and control module, contained within the channelizer, enables monitoring

and control of the repeater. This module determines the status of the channel module

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 uses an RS232 serial port

interface which connects to a laptop computer using Windows HyperTerminal or

another similar terminal emulation program. Also, the status and control module sends

and receives channel and amplification data on the addressed channel module when

connected to a cellular 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.

5.1.6 Interconnect Module

The Interconnect Module provides interface and power connection to all of the modules

in the remote unit. The control module, located in the channelizer, monitors each of

the major modules by monitoring status and control lines distributed through the

interface module. DC levels required by the channelizer are also regulated on the

interconnect module and distributed to the channelizer.

5.1.7 Fiber Optic Transceiver

The Fiber Optic Transceiver modulates or demodulates the RF signal from the optical

signal and provides interconnection to the optical fiber. Interconnection is provided via

the interconnect module with the control module located in the controller. The control

module transmits alarm status to the Hub Unit by pulsing the laser. This is received at

the Hub where the alarm status is displayed or is monitored on a remote computer.