Manual Part 1

Introduction to EMS Data Flow

Element Management System (EMS) 4.0 User Manual

1.2 Data Flow

Data flow between a host unit and remote unit consists of at least one forward path

and one reverse path. In diversity systems, there is a secondary reverse path, also.

Figure 3 shows the data flow. As shown, input to the Host PCIx Card from the

BTS application consists of up to eight “logical RF channels.” On the card these

logical channels are combined into a composite signal to the remote unit. Control

data from the EMS computer is also combined into this signal. In the remote unit,

digital RF data is converted to analog RF signals for the remote unit antenna. Data

flow and operations in the reverse path are essentially the reverse of those in the

forward path.

Figure 3. Data Flow

Logical RF channels are defined by user commands entered in EMS based on type

of signals being received from the BTS application. User commands include RF

modulation type, FCC channel number, and signal gain settings.

19488-A

(8) LOGICAL

CHANNELS

(8) LOGICAL

CHANNELS

COMBINER

SPLITTER

COMPOSITE

SIGNAL

(25 MHz)

CHANNEL

DEFINITION

HOST UNIT

FUNCTIONS

DIGITAL

TO RF

CONVERTER

HOST PCIx CARD

PCIx BUS

SDR

APPLICATION

EMS USER

COMMANDS

CONTROL DATA

HOST

NETWORK

CARD

ANALOG

SIGNAL